Crown Architecture

Category: Planning

  • How to Get Planning Permission Refusal Overturned UK — Full Guide

    Planning documents and architecture plans on desk

    Receiving a planning permission refusal is frustrating — but it is not the end of the road. In the UK, there are several routes to getting a refusal overturned or working around it to achieve your project goals. This guide explains your options clearly.

    Step 1: Understand Why You Were Refused

    The refusal notice will include a list of reasons for refusal. Read these carefully — they are specific legal grounds under planning policy. Common reasons include:

    • Design out of character with the area
    • Overbearing impact on neighbours
    • Loss of privacy (overlooking)
    • Loss of light to neighbouring properties
    • Highway/access concerns
    • Impact on conservation area character
    • Insufficient information provided

    Understanding the exact grounds for refusal determines which strategy is most likely to succeed.

    Option 1: Appeal to the Planning Inspectorate

    You have the right to appeal a planning refusal to the Planning Inspectorate (PINS). Appeals are free to submit.

    Key Facts About Planning Appeals

    • Time limit: 6 months from refusal date (3 months for householder appeals)
    • Success rate: Around 30–40% of householder appeals succeed nationally
    • Types of appeal: Written representations (most common), hearing, or public inquiry
    • Timeline: Written representations typically decided within 24–36 weeks

    When to Appeal

    Appeals are most likely to succeed when:

    • The council’s reasons for refusal are weak or poorly evidenced
    • National planning policy supports your development
    • Similar developments have been approved nearby
    • The council officer’s recommendation was approval but members overturned it

    How to Strengthen Your Appeal

    • Prepare a detailed planning statement addressing each ground of refusal
    • Include supporting evidence: photos, precedent decisions, design rationale
    • Consider appointing a planning consultant for complex cases
    • Get neighbour support letters if possible

    Option 2: Redesign and Resubmit

    In many cases, the fastest route to approval is to address the council’s concerns and resubmit a revised application. Benefits include:

    • Faster: New applications are decided within 8 weeks (vs. 24+ weeks for appeal)
    • Cheaper: No need for a planning consultant in straightforward cases
    • More collaborative: Officers are often willing to provide pre-application advice

    How to Redesign Successfully

    1. Contact the case officer to discuss what changes would make the application acceptable
    2. Request a pre-application meeting (charged in some councils, free in others)
    3. Have your architect redesign to address the specific refusal reasons
    4. Include a Design and Access Statement explaining the changes made

    Option 3: Submit a Revised Application Under Section 73

    If the original permission was close to approval, you can submit a Section 73 application to modify conditions or minor elements without starting afresh. This is faster and cheaper than a full new application.

    Option 4: Apply for Lawful Development Certificate Instead

    If your proposed development falls within Permitted Development limits but you applied for full planning permission unnecessarily, you can instead apply for a Lawful Development Certificate, which cannot be refused on planning policy grounds.

    Option 5: Ombudsman Complaint

    If you believe the council handled your application incorrectly (e.g., procedural errors, bias, or maladministration), you can complain to the Local Government and Social Care Ombudsman. Note this does not overturn the planning decision but can result in compensation or a fresh decision process.

    Option 6: Judicial Review

    As a last resort, you can challenge a planning decision through judicial review in the courts. This is expensive (£5,000–£30,000+) and only succeeds if there was a legal error in the decision-making process — it does not review planning merits. This option is rare for householder applications.

    Tips to Avoid Refusal in the First Place

    • Always seek pre-application advice from the council before submitting
    • Research what has been approved and refused nearby (search the council’s planning portal)
    • Prepare a thorough Design and Access Statement
    • Address neighbour concerns proactively — objections carry weight
    • Use an experienced architect who knows your local planning authority’s preferences

    See our guides: How Long Does a Planning Application Take UK and What is Permitted Development UK.

    Get a Free Quote from Crown Architecture

    Ready to discuss your project? Fill in the form below and we’ll get back to you within 24 hours.

    Frequently Asked Questions

    How long do I have to appeal a planning refusal UK?

    For householder applications (extensions and alterations to your home), you have 12 weeks from the date of refusal to submit an appeal to the Planning Inspectorate. For other types of planning application, the deadline is 6 months. Appeals must be submitted online via the Planning Inspectorate’s appeals casework portal.

    What percentage of planning appeals succeed UK?

    Nationally, around 30–40% of householder planning appeals are allowed (successful) in England. Success rates vary significantly by type of development and local authority. Appeals are most successful when the council’s refusal was on subjective design grounds, when national policy clearly supports the proposal, or when similar developments have been approved nearby.

    Can I resubmit a planning application after refusal for free?

    In England, you can resubmit a planning application within 12 months of a refusal without paying a fee, provided the new application is for the same or similar development. This “free go” applies to householder and minor applications. The resubmission must genuinely address the reasons for refusal.

    How much does a planning appeal cost UK?

    Submitting a planning appeal is free. However, preparing a strong appeal — including a planning statement and any supporting evidence — often benefits from professional help. A planning consultant may charge £1,500–£5,000+ to manage a householder appeal, depending on complexity. The Planning Inspectorate does not charge to determine appeals.

  • Permitted Development Rights for Extensions 2025 — Complete UK Guide

    UK house with rear extension under permitted development

    Understanding Permitted Development (PD) rights is essential if you are planning to extend your home in England in 2025. Many common home improvements — including rear extensions, loft conversions, and garden outbuildings — can be carried out without needing full planning permission.

    However, the rules are detailed and there are important exceptions. This guide covers everything you need to know about permitted development rights for extensions in 2025.

    What Are Permitted Development Rights?

    Permitted development rights are a national grant of planning permission for certain types of work, provided by the Town and Country Planning (General Permitted Development) (England) Order 2015 (as amended). They allow homeowners to carry out many building works without applying to the local council for planning permission.

    The rules are set nationally, but local Article 4 Directions can remove or restrict these rights in certain areas.

    Permitted Development for Single Storey Rear Extensions

    Standard Limits (No Prior Approval Required)

    • Detached houses: Up to 4 metres depth from the original rear wall
    • Semi-detached and terraced houses: Up to 3 metres depth
    • Maximum height: 4 metres (single storey)
    • Eaves height: No more than 3 metres within 2 metres of the boundary

    Larger Home Extension Scheme (Prior Approval Required)

    Under the Neighbour Consultation Scheme (Part 1, Class A), you can extend further with prior approval:

    • Detached houses: Up to 8 metres depth
    • Semi-detached and terraced houses: Up to 6 metres depth
    • Prior approval requires notifying neighbours and receiving council sign-off (typically 42 days)

    Permitted Development for Two-Storey Rear Extensions

    • Maximum 3 metres depth from original rear wall
    • Must be at least 7 metres from the rear boundary
    • Maximum height same as existing house
    • No balconies, verandas, or raised platforms on upper floor
    • Roof pitch must match existing house

    Side Extensions Under Permitted Development

    Single storey side extensions are permitted development if:

    • Width is no more than half the width of the original house
    • Maximum height 4 metres
    • Does not front a highway (road, footpath, public open space)

    Note: Two-storey side extensions require planning permission in most cases.

    Loft Conversions Under Permitted Development

    Loft conversions are permitted development if the additional volume is within these limits:

    • Detached and semi-detached houses: Up to 50m³ additional volume
    • Terraced houses: Up to 40m³ additional volume
    • Dormers must not project beyond the plane of the existing roof on the principal elevation
    • No balconies or verandas
    • Materials must be similar in appearance to the existing house

    What Is NOT Covered by Permitted Development?

    Properties That Cannot Use PD Rights

    • Flats and maisonettes — no PD rights for extensions
    • Listed buildings — require listed building consent for any work
    • Conservation areas — PD rights are significantly restricted; side extensions always need planning permission
    • Areas of Outstanding Natural Beauty (AONB), National Parks, World Heritage Sites — restricted rights
    • Article 4 Direction areas — local councils can remove PD rights in specific areas

    Work That Always Requires Planning Permission

    • Extensions that cover more than 50% of the garden area
    • Extensions in front of the principal elevation
    • Mansard loft conversions in most cases
    • Any work on a listed building (listed building consent needed)
    • Change of use of a building or room

    How to Check If Your Project Is Permitted Development

    1. Use the Planning Portal’s interactive guide: planningportal.co.uk
    2. Apply for a Lawful Development Certificate (LDC): This is a legal document confirming your project is permitted development. Costs around £103 in England. Highly recommended before starting any major work.
    3. Contact your local planning authority: Pre-application advice is available from councils and is worth doing for complex situations.
    4. Consult an architect: An experienced architect can quickly confirm whether your project is PD and help you apply for an LDC.

    Lawful Development Certificates — Why You Should Get One

    Even if your project is permitted development, getting a Lawful Development Certificate (LDC) from your local council provides important protection:

    • Legal proof your project was lawful at the time of construction
    • Required by mortgage lenders and solicitors when selling
    • Protects you if planning rules change in future
    • Costs around £103 (half the normal planning fee)

    See also: What is Permitted Development UK — Complete Guide

    Get a Free Quote from Crown Architecture

    Ready to discuss your project? Fill in the form below and we’ll get back to you within 24 hours.

    Frequently Asked Questions — Permitted Development 2025

    Has permitted development changed in 2025?

    The core permitted development rules for house extensions in England remain largely unchanged in 2025. The key limits — 4m for detached houses, 3m for terraces and semi-detached under standard rules, and 8m/6m under the larger homes scheme — remain in place. Always check the current Planning Portal guidance as rules are subject to periodic amendment.

    What are the permitted development rules for extensions on terraced houses?

    For terraced houses, rear single storey extensions can extend up to 3 metres from the original rear wall without planning permission (or up to 6 metres under the larger homes prior approval scheme). Side extensions are permitted if they are single storey and no more than half the width of the original house. No extensions can be built to the front of the property.

    Can I build a two-storey extension under permitted development?

    Yes, two-storey rear extensions can be built under permitted development in England if they do not extend more than 3 metres from the original rear wall and are at least 7 metres from the rear boundary. The extension cannot be taller than the existing house. Side two-storey extensions generally require planning permission.

    What happens if I build an extension without planning permission when I needed it?

    Building without the required planning permission is a breach of planning control. The council can issue an enforcement notice requiring you to demolish the extension. After 4 years, enforcement action for a dwelling house becomes time-barred in most cases, but problems often arise when selling. Always get proper permissions or a Lawful Development Certificate before starting work.

  • What is Permitted Development UK — Complete Guide

    Detached house in England with potential for permitted development works

    What is Permitted Development in the UK? Complete Guide

    Permitted development (PD) rights are one of the most important — and least understood — aspects of the UK planning system. Understanding them can save you time, money, and the uncertainty of a planning application. This complete guide from Crown Architecture & Structural Engineering explains what permitted development is, what you can do under it, and when you will still need planning permission.

    What is Permitted Development?

    Permitted development rights are a set of national planning permissions granted by Parliament through the Town and Country Planning (General Permitted Development) (England) Order 2015 (as amended). They allow homeowners to carry out certain types of work on their homes without needing to apply for planning permission from their local planning authority.

    In effect, PD rights mean that Parliament has already decided, at a national level, that certain works are acceptable in principle — subject to defined limits and conditions. The local planning authority has no role in approving or refusing works that genuinely fall within PD rights.

    PD rights apply to houses. They do not apply to flats, maisonettes, commercial buildings, or land. They also do not apply to listed buildings, or to properties in designated areas where the rights have been specifically removed or restricted.

    What Can You Do Under Permitted Development?

    Rear Extensions

    Single-storey rear extensions up to 3 metres deep (terraced/semi-detached) or 4 metres deep (detached) are permitted development, subject to height and design conditions. Under the Neighbour Consultation Scheme, larger extensions up to 6m or 8m may be permitted subject to a prior approval process. See our detailed guide on house extensions in London.

    Loft Conversions

    Loft conversions are permitted development if the volume added does not exceed 40m³ (terraced) or 50m³ (semi-detached/detached), the roof is not raised above the highest point of the original roof, and no balconies or verandas are added. Side-facing windows must be obscure-glazed. Learn more in our guide on loft conversions in London.

    Outbuildings

    Garden buildings, sheds, garages, and other outbuildings in the garden are permitted development provided they are single-storey, the eaves height does not exceed 2.5 metres, the maximum overall height does not exceed 4 metres (dual pitch) or 3 metres (any other roof), and the building is not in front of the principal elevation of the house. The outbuilding cannot occupy more than 50% of the land around the original house (when combined with any other extensions or outbuildings).

    Side Extensions

    Single-storey side extensions are permitted development where they are no wider than half the width of the original house, are single-storey (no more than 4m high), and use similar materials to the original house. However, in conservation areas and other designated areas, side extensions visible from a highway are not permitted development.

    Porches

    Porches are permitted development if they are no more than 3 square metres in footprint (measured externally), no more than 3 metres in height, and more than 2 metres from any boundary with a highway.

    Rooflights / Velux Windows

    Installing roof windows is permitted development provided they do not protrude more than 150mm above the roof plane on the principal or side elevation facing a highway, and are not higher than the ridge. Solar panels can also be installed under permitted development in most circumstances.

    What is NOT Permitted Development?

    The following works always require planning permission, regardless of size:

    • Works to a listed building (which also require listed building consent)
    • Works in certain designated areas where PD rights have been removed (see below)
    • Converting a house into flats
    • Adding a new dwelling or self-contained unit
    • Works that materially alter the external appearance in ways not covered by PD rights
    • Changes of use of the building (unless covered by specific PD rights for change of use)

    The Original House Rule

    One of the most important concepts in permitted development is the original house rule. When calculating whether your extension is within the permitted development limits, the measurements are taken from the original house as it was built, or as it stood on 1 July 1948 (whichever is later). This means that any previous extensions or alterations are ignored when measuring the depth, but they count towards the 50% coverage rule. If you buy a house that has already been extended, any further extension must still be within the PD limits measured from the original house.

    How to Confirm Permitted Development Rights

    The safest way to confirm that your proposed works are permitted development is to apply for a Lawful Development Certificate (LDC) from your local planning authority. An LDC is a formal legal document confirming that the works described are lawful. It costs half the planning fee (currently £129 for a householder LDC) and takes around 8 weeks.

    An LDC is not legally required before commencing permitted development works, but it is strongly recommended — especially if you plan to sell the property in the future, as solicitors and buyers will want evidence that works were lawfully carried out.

    When Are PD Rights Removed?

    Article 4 Directions

    A local planning authority can issue an Article 4 Direction to remove some or all permitted development rights in a defined area. These are most commonly used in conservation areas, where they may require planning permission for works that would otherwise be PD (such as replacing windows, adding a satellite dish, or changing the roof material). You can check whether your property is affected by an Article 4 Direction by contacting your local planning authority or checking your council’s website.

    Conservation Areas, AONBs, and National Parks

    In conservation areas, Areas of Outstanding Natural Beauty, National Parks, and World Heritage Sites, additional restrictions apply. For example, any side extension visible from a highway is not permitted development, and cladding the exterior of a house is not permitted development. Crown Architecture in Hackney and Crown Architecture in Islington have extensive experience navigating conservation area restrictions across London.

    Conditions Imposed at Planning Stage

    When a house is built or an earlier extension is approved, the planning permission may include a condition removing permitted development rights. This is sometimes used to ensure the character of new developments is maintained. You can check whether such conditions apply by reviewing the planning history of your property on your council’s planning portal.

    Permitted Development in Wales, Scotland, and Northern Ireland

    This guide covers permitted development rights in England only. Wales, Scotland, and Northern Ireland each have their own separate permitted development regimes, which differ in important respects. If your property is in Wales, Scotland, or Northern Ireland, please contact us for specific advice.

    Get a Free Quote from Crown Architecture

    Speak to our expert architects today

    Frequently Asked Questions

    Do I need to notify anyone before carrying out permitted development works?

    For most permitted development works, you do not need to notify your local planning authority before starting. However, for larger rear extensions under the Neighbour Consultation Scheme (6m or 8m depth), you must submit a prior approval application to the LPA before commencing. You may also need to apply for building regulations approval and serve a Party Wall Notice on your neighbours, depending on the nature of the works.

    Can I lose permitted development rights after buying a house?

    You may find that permitted development rights have already been removed from a property before you buy it — either by a condition on an earlier planning permission, by an Article 4 Direction, or because the property is in a designated area. Crown Architecture always checks the planning history and constraints for a property at the start of a project to identify any such restrictions.

    Does permitted development apply to blocks of flats?

    No. Permitted development rights for householder works (extensions, loft conversions, outbuildings, etc.) apply to houses only. Flats, maisonettes, and other types of dwelling do not benefit from these rights. If you own a flat and wish to extend or alter it, you will need to apply for planning permission.

    What is the 4-year rule for permitted development?

    The 4-year rule (now changed to 4 years under the Levelling-Up and Regeneration Act 2023) previously meant that if a building had been in use or an operational development had been carried out for 4 years without enforcement action, it became immune from enforcement. However, the rules have been updated and the limitation period for most breaches of planning control is now 4 years from the date of the breach. Always seek professional advice if you are relying on this provision.

    Can permitted development rights be used for a home office in the garden?

    Yes. A garden office or outbuilding is permitted development provided it meets the conditions: single-storey, eaves no higher than 2.5m, overall height no more than 4m (dual pitch) or 3m (flat/other roof), not in front of the principal elevation, and not covering more than 50% of the garden. The building must not be used as separate residential accommodation (i.e., you cannot sleep in it independently of the main house).

  • How Long Does a Planning Application Take UK

    Architectural drawings and planning documents on a desk

    How Long Does a Planning Application Take in the UK?

    One of the first questions homeowners ask when planning a project is: how long will the planning process take? The honest answer is that it depends on the type of application, the quality of the submission, and how busy your local planning authority is. This guide from Crown Architecture explains the statutory timescales, the step-by-step process, and how to give your application the best chance of a swift approval.

    Statutory Planning Timescales at a Glance

    Application Type Statutory Timescale Typical Real-World Time
    Householder (extensions, lofts, outbuildings) 8 weeks 8–16 weeks
    Full Planning Permission 8 weeks 8–16 weeks
    Major Applications (10+ dwellings) 13 weeks 13–26 weeks
    Prior Approval (larger extensions) 42 days 42 days
    Lawful Development Certificate 8 weeks 8–12 weeks
    Listed Building Consent 8 weeks 8–20 weeks

    The statutory timescale is the period within which the local planning authority (LPA) is supposed to determine the application. In practice, many LPAs are under-resourced and regularly exceed these timescales. In London particularly, it is not uncommon for householder applications to take 12–16 weeks, even with a well-prepared submission.

    The Step-by-Step Planning Application Process

    Step 1: Pre-Application (2–8 weeks)

    Before submitting a planning application, it is often worthwhile to arrange a pre-application meeting with your local planning authority. This is a paid service (typically £100–£500) where a planning officer reviews your proposals informally and provides feedback. It can significantly reduce the risk of refusal and identify any issues before the formal submission.

    Crown Architecture will also carry out our own assessment of your proposal against the relevant planning policies before submission.

    Step 2: Preparation of Drawings and Documents (2–4 weeks)

    A well-prepared application requires professionally drawn plans, elevations, and sections showing the existing and proposed works. It may also require a Design and Access Statement, Heritage Statement (for conservation areas or listed buildings), or a Planning Statement. Crown Architecture prepares all of these as part of our planning service.

    Step 3: Submission and Validation (1–2 weeks)

    The application is submitted online through the Planning Portal, along with the appropriate fee. The LPA then validates the application — checking that all required documents are included and the fee has been paid. If the application is invalid, it is returned and the clock does not start until it is resubmitted correctly.

    Step 4: Consultation Period (21 days)

    Once validated, the LPA notifies neighbours and other consultees (such as the highways authority or conservation officer) and places a site notice. The statutory consultation period is 21 days, during which anyone can submit comments. The case officer cannot determine the application until this period has elapsed.

    Step 5: Assessment and Decision (3–8 weeks after consultation)

    The case officer assesses the application against relevant planning policies — the National Planning Policy Framework (NPPF), the Local Plan, and any neighbourhood plans. For householder applications decided under delegated powers (i.e., by an officer rather than a planning committee), a decision is typically issued within 8 weeks of validation. Applications referred to the planning committee take longer, as they must be scheduled for a committee meeting.

    Step 6: After the Decision

    If permission is granted, it will be subject to conditions. Standard conditions include the commencement period (typically 3 years), materials approval, and sometimes pre-commencement conditions that must be discharged before work starts. Discharging conditions typically takes 8 weeks and should not be overlooked — commencing work without discharging pre-commencement conditions can invalidate your permission.

    Why Planning Applications Take Longer Than Expected

    Several factors routinely delay planning decisions beyond the statutory timescale:

    • Invalid applications: Missing documents, incorrect fee, or insufficient drawings will cause the application to be returned and the clock to restart.
    • Third-party objections: Significant neighbour objections can require the case officer to seek additional information or refer the application to a planning committee.
    • Conservation area or heritage issues: Applications affecting listed buildings or conservation areas require consultation with the conservation officer, which can extend timescales considerably.
    • LPA resourcing: Many local planning authorities in London are under significant resource pressure, with high case loads and staff vacancies. This is the single most common cause of delay.
    • Pre-commencement conditions: Even after a decision, you may need to discharge conditions before starting work, adding several more weeks.

    How to Speed Up Your Planning Application

    There are several steps you can take to maximise the chances of a quick, successful decision:

    1. Use a qualified architect: A well-prepared application from a professional architect is far less likely to be returned as invalid or to generate unnecessary queries from the case officer.
    2. Carry out pre-application engagement: Discussing your proposals with the LPA before submission can identify potential issues early and smooth the formal process.
    3. Engage with neighbours early: Informally discussing your proposals with neighbours before submission can reduce the risk of objections that cause delay.
    4. Avoid peak periods: Some LPAs have seasonal peaks and troughs in workload. Submitting in early January or late summer can sometimes yield quicker decisions.
    5. Respond promptly to queries: If the case officer requests additional information, responding quickly will prevent unnecessary delay.

    What Happens After Planning Approval

    Planning permission is just the first approval you need. Before work starts, you will also need building regulations approval. For most domestic extensions and loft conversions, this involves submitting a full plans application to your LPA’s building control department (or an approved inspector). See our guide on house extensions in London for more detail on the full process from planning to completion.

    Crown Architecture handles the full journey — from initial design through planning permission and building regulations to construction stage inspections.

    Get a Free Quote from Crown Architecture

    Speak to our expert architects today

    Frequently Asked Questions

    What is the statutory timescale for a householder planning application?

    The statutory timescale for a householder planning application (for works such as extensions, loft conversions, or outbuildings) is 8 weeks from the date of validation. However, many local planning authorities, particularly in London, regularly exceed this timescale due to high workloads, and real-world timescales of 12–16 weeks are common.

    Can I start building before planning permission is granted?

    No. You must not start works that require planning permission until permission has been formally granted. Commencing without permission is a breach of planning control and can result in an enforcement notice requiring you to demolish the works at your own expense. The only exception is works that are genuinely permitted development, which do not require a planning application at all.

    How long does planning permission last once granted?

    Planning permission for most residential developments lasts 3 years from the date of the decision notice. You must commence the development within this period. Commencement is generally defined as a material operation on site, such as breaking ground or laying foundations. If you have not started within 3 years, the permission expires and you would need to reapply.

    What is the planning application fee for a householder extension?

    As of 2025, the planning application fee for a householder application in England is £258. For a Lawful Development Certificate application, the fee is £129 (half the householder fee). Fees for other application types vary — contact Crown Architecture for a full breakdown of all likely costs for your project.

    What happens if my planning application is refused?

    If your application is refused, you have several options. You can revise the design to address the reasons for refusal and resubmit (the first resubmission within 12 months is free). Alternatively, you can appeal to the Planning Inspectorate — the appeal process typically takes 6–12 months. Crown Architecture will advise on the best strategy following a refusal.

  • Do I Need Planning Permission for a Rear Extension UK

    Modern rear extension on a UK semi-detached house

    Do I Need Planning Permission for a Rear Extension in the UK?

    One of the most common questions we receive at Crown Architecture is whether a rear extension needs planning permission. The answer depends on your property type, the size of the extension, and where you live. In many cases, a rear extension can be built under permitted development rights without the need for a planning application. This guide explains everything you need to know.

    What Is Permitted Development?

    Permitted development (PD) rights are a set of nationally defined planning permissions granted to homeowners in England by Parliament. They allow certain types of work — including rear extensions — to be carried out without the need to submit a planning application to your local council, provided the works fall within defined limits and conditions.

    Permitted development rights apply to houses (not flats, maisonettes, or commercial properties). They were introduced to speed up minor domestic works and reduce the administrative burden on local planning authorities. You can learn more in our guide on planning permission in London.

    Rear Extension Size Limits Under Permitted Development

    For single-storey rear extensions in England, the standard permitted development limits are:

    • Terraced and semi-detached houses: Up to 3 metres beyond the rear wall of the original house
    • Detached houses: Up to 4 metres beyond the rear wall of the original house

    The Neighbour Consultation Scheme (Larger Home Extension Scheme)

    Under the Neighbour Consultation Scheme (sometimes called the larger home extension scheme), larger rear extensions are permitted development subject to a prior approval process. The limits are:

    • Terraced and semi-detached houses: Up to 6 metres beyond the rear wall
    • Detached houses: Up to 8 metres beyond the rear wall

    Under this scheme, you must notify the local planning authority, who will consult with adjoining neighbours. If no objections are received within 21 days, the extension can proceed. If objections are received, the local planning authority decides whether to grant prior approval based on the impact on the amenity of adjoining properties.

    Conditions Required for Permitted Development

    Even where the size limits are met, a rear extension must also comply with these conditions to be permitted development:

    • Maximum height of 4 metres for a pitched roof, or 3 metres for any other roof type
    • Where within 2 metres of the boundary, the eaves height must not exceed 3 metres
    • No verandas, raised platforms, or balconies
    • Materials must be of a similar appearance to the existing house
    • The extension must not extend beyond the side elevation of the original house
    • The extension, together with any other extensions, must not exceed 50% of the total area of land around the original house

    When Will You Need Planning Permission for a Rear Extension?

    You will need to apply for full planning permission if:

    • The extension exceeds the size limits above (even under the larger scheme)
    • Your property is a flat or maisonette (PD rights do not apply)
    • The extension is two-storey (separate rules apply — see below)
    • The works do not comply with the conditions listed above
    • Your home’s PD rights have been removed by an Article 4 Direction
    • You live in a conservation area, AONB, National Park, or World Heritage Site and the extension would be visible from a highway
    • You live in a listed building (listed building consent is required in addition to any planning permission)

    Two-Storey Rear Extensions

    Two-storey rear extensions are permitted development up to 3 metres beyond the rear wall of the original house, provided the roof pitch matches the existing house, and there are no windows on the side elevation or any balconies. However, if the extension is within 7 metres of the rear boundary, you will need planning permission.

    Conservation Areas and Article 4 Directions

    If your property is in a conservation area, permitted development rights are more restricted. Any rear extension that is visible from a public road or footpath will require planning permission, even if it would otherwise be permitted development.

    An Article 4 Direction is a local planning authority order that withdraws some or all permitted development rights in a defined area. They are commonly used in conservation areas, but can also apply to individual streets or properties. To find out if your property is affected, check with your local planning authority or use the planning portal.

    At Crown Architecture, we work extensively in conservation areas across Hackney, Islington, and other London boroughs where Article 4 Directions are common.

    Lawful Development Certificate

    Even if your rear extension is permitted development, it is strongly advisable to apply for a Lawful Development Certificate (LDC) from your local planning authority. An LDC is a formal, legally binding document confirming that your works are lawful.

    Without an LDC, you may encounter difficulties when selling your property, as solicitors and buyers will want evidence that any works were lawfully carried out. An LDC application costs around £120 (half the planning fee) and typically takes 8 weeks to process.

    How Crown Architecture Can Help

    Crown Architecture & Structural Engineering provides a comprehensive service for rear extensions, from initial feasibility through to planning and building regulations approval. We will assess your property, advise on the most appropriate route, and prepare all the drawings and documentation needed to get your project approved and built.

    Get a Free Quote from Crown Architecture

    Speak to our expert architects today

    Frequently Asked Questions

    Can I build a 4-metre rear extension without planning permission?

    On a detached house, a single-storey rear extension up to 4 metres deep is standard permitted development. On a terraced or semi-detached house, the standard PD limit is 3 metres. However, under the Neighbour Consultation Scheme, you may be able to build up to 8 metres (detached) or 6 metres (semi/terraced) subject to a prior approval process.

    Do I need planning permission for a rear extension on a flat?

    Yes. Permitted development rights apply to houses only, not flats or maisonettes. If you live in a flat and wish to extend, you will need to apply for full planning permission regardless of the size of the works.

    How close to my neighbour’s boundary can I build a rear extension?

    There is no minimum distance from a rear boundary set by permitted development rules for single-storey rear extensions, provided the total depth limit is not exceeded. However, where the extension is within 2 metres of a side boundary, the eaves height must not exceed 3 metres. You may also need to serve a Party Wall Notice on your neighbour if the works are within 3 metres of their property.

    What is the maximum height for a rear extension under permitted development?

    The maximum permitted development height for a single-storey rear extension is 4 metres for a pitched roof, or 3 metres for a flat or other roof type. Where the extension is within 2 metres of a boundary, the eaves must not exceed 3 metres regardless of the total height.

    What is a Lawful Development Certificate and do I need one?

    A Lawful Development Certificate (LDC) is a formal document from the local planning authority confirming that your works are lawful under permitted development. While not strictly required before building, it is strongly recommended as it provides legal certainty, protects you when selling the property, and confirms compliance. Crown Architecture can apply for an LDC on your behalf as part of our service.

  • Building Regulations vs Planning Permission — What’s the Difference

    Architect reviewing building regulations documents

    Building Regulations vs Planning Permission — What is the Difference?

    Homeowners planning an extension, loft conversion, or other building project frequently confuse planning permission and building regulations. They are two entirely separate approval systems, administered by different parts of your local council, covering different aspects of your project. Understanding the difference is essential before you start any project. This guide from Crown Architecture & Structural Engineering explains both systems clearly.

    Get a Free Quote from Crown Architecture

    Tell us about your project and we’ll respond within 24 hours.

    📋 Get a Free Quote

    Interested in a loft conversion or extension? We offer free initial consultations.

    Crown Architecture Quote Request

    The Key Difference

    In simple terms:

    • Planning permission controls whether you are allowed to build something — it is about the principle of the development, its size, appearance, and impact on the surrounding area.
    • Building regulations control how you build it — they are technical standards covering structural integrity, fire safety, thermal performance, drainage, and the health and safety of the people who will use the building.

    You may need one, the other, or both, depending on what you are doing. Some projects require planning permission but not building regulations (rare). Most require building regulations but not planning permission. Major works usually require both.

    What Does Planning Permission Cover?

    Planning permission considers the visual impact and amenity of proposed development. When assessing an application, a planning officer will consider:

    • The size, scale, and massing of the proposed development
    • Its appearance and materials, and whether it is appropriate in the context of the street and neighbourhood
    • The impact on the privacy and amenity of neighbouring properties (overlooking, overshadowing, loss of outlook)
    • Impact on protected trees, ecology, or heritage assets
    • Car parking, access, and highway safety
    • Compliance with the National Planning Policy Framework, Local Plan, and any neighbourhood plan policies

    Planning permission is administered by the local planning authority (LPA), which is typically your district or borough council. It is a democratic process — applications are publicly advertised, neighbours can comment, and decisions can be made by an elected planning committee.

    What Do Building Regulations Cover?

    Building regulations are technical minimum standards that apply to most building work in England and Wales. They are set out in the Building Regulations 2010 and the Approved Documents that support them. The key Parts are:

    PartWhat It Covers
    Part AStructure — loads, foundations, walls, floors, roofs
    Part BFire Safety — means of escape, fire spread, access for fire services
    Part CResistance to Contaminants and Moisture — damp-proofing, ground contamination
    Part EResistance to Sound — sound insulation between dwellings
    Part FVentilation — natural and mechanical ventilation
    Part LConservation of Fuel and Power — insulation, energy efficiency, U-values
    Part MAccess to and Use of Buildings — accessibility requirements
    Part PElectrical Safety — notifiable electrical work

    Building regulations are enforced by building control, which is either the local authority building control service or an approved inspector (a private sector body). Building control is a technical process, not a democratic one — there are no public consultations or committees.

    When Do You Need Each?

    Type of WorkPlanning Permission?Building Regs?
    Rear extension (within PD limits)No (permitted development)Yes
    Rear extension (exceeds PD limits)YesYes
    Loft conversionOften no (PD)Yes
    Internal structural alterationNoYes
    Change of use (e.g. office to flat)Usually yes (or prior approval)Yes
    New fence (under 2m)NoNo
    Garage conversionUsually no (PD)Yes

    Full Plans vs Building Notice

    There are two main ways to obtain building regulations approval:

    Full Plans Application: You submit detailed drawings and specifications to building control before work starts. Building control reviews and approves the plans before construction begins. This is the recommended approach for most projects, especially complex ones, because it identifies any compliance issues before work starts rather than after.

    Building Notice: You notify building control that work is starting but do not submit detailed drawings for prior approval. Building control inspects the work as it progresses. This is quicker to start but carries the risk that non-compliant work may need to be undone and rebuilt.

    Crown Architecture prepares full plans applications as standard, ensuring your project is properly documented and building control approval is obtained before work begins.

    Inspections and the Completion Certificate

    Throughout the construction process, the building control officer will carry out inspections at key stages — typically: commencement, foundations, damp-proof course, structural steels, insulation, drainage, and final completion. It is the contractor’s responsibility to notify building control at each stage.

    Once all work is satisfactorily completed, building control issues a Completion Certificate. This is a crucial document — it confirms that the building work has been inspected and complies with the building regulations. Without it, you may encounter difficulties when selling the property.

    Consequences of Non-Compliance

    Carrying out building work that requires building regulations approval without obtaining it is a criminal offence. The local authority can issue an enforcement notice requiring you to open up or demolish non-compliant work. When you come to sell your property, a solicitor will ask for evidence of building regulations compliance for any notifiable work. If you cannot provide it, you may need to obtain indemnity insurance or retrospective regularisation, which is costly and uncertain.

    Crown Architecture manages the building regulations process on every project we undertake, ensuring you receive your completion certificate. For more information on the end-to-end process, see our guides on loft conversions and house extensions in London.

    Get a Free Quote from Crown Architecture

    Speak to our expert architects today

    Frequently Asked Questions

    Can I get building regulations approval without planning permission?

    Yes. Many projects require building regulations approval but not planning permission — for example, a rear extension carried out under permitted development rights still needs building regulations approval. Building control and planning are entirely separate systems. Building control will not check whether you have obtained planning permission, and the planning authority will not check whether you have building regulations approval. It is your responsibility to ensure you have all the necessary approvals for your project.

    What happens if I sell my house without a building regulations completion certificate?

    If you cannot provide a completion certificate for notifiable building works, your solicitor will flag this as a potential issue in the conveyancing process. The buyer’s solicitor may require you to obtain indemnity insurance to cover the risk of enforcement action. Alternatively, you can apply for a regularisation certificate from the local authority, which involves an inspection of the completed work. Neither option is ideal — the best approach is to ensure all work is properly signed off at the time of construction.

    Do I need building regulations for a kitchen renovation?

    A like-for-like kitchen renovation (replacing units and appliances in the same positions) does not typically require building regulations approval. However, if you are moving a gas supply, adding new electrical circuits, or relocating drainage, individual elements may be notifiable. Gas work must be carried out by a Gas Safe registered engineer, and certain electrical work must be carried out by or notified to building control by a Part P registered electrician.

    How much do building regulations applications cost?

    Building regulations fees are set by each local authority or approved inspector and vary depending on the type and scale of work. For a typical single-storey rear extension, the full plans fee is typically £800–£1,200. For a loft conversion, expect to pay £1,000–£1,500. Fees for larger or more complex projects are higher. Crown Architecture includes the building regulations drawings in our fee — you pay the application fee directly to building control.

    What is an approved inspector and should I use one?

    An approved inspector is a private sector body (or individual) registered with the Construction Industry Council (CIC) to carry out building control work. They provide an alternative to local authority building control. Approved inspectors can sometimes offer a more responsive service and are often preferred for commercial and larger residential projects. For straightforward domestic projects, local authority building control is perfectly adequate and is the most commonly used route.