Permitted Development (PD) rights are one of the most valuable but widely misunderstood aspects of UK planning law. They allow homeowners to carry out a wide range of extensions, alterations and outbuildings without submitting a formal planning application — saving time, money and the risk of refusal. But PD rights come with a complex set of conditions and limitations, and getting them wrong can lead to enforcement action or problems on sale. This guide provides a comprehensive overview of what is and is not permitted in England in 2025.

What Are Permitted Development Rights?

Permitted Development rights are a form of planning permission granted by Parliament (through the Town and Country Planning (General Permitted Development) (England) Order 2015, as amended) rather than by individual local planning authorities. Development falling within PD rights is automatically permitted — no planning application to your council is required.

PD rights exist to streamline the planning system for common, low-impact development. However, they are not blanket permissions — each class of development comes with specific conditions, limitations and restrictions that must all be met for the right to apply.

PD rights can also be removed or restricted by:

• Article 4 Directions made by the local planning authority (common in conservation areas)
• Planning conditions on the original planning permission for the house
• The property being a listed building (which removes all PD rights)
• The property being a flat or maisonette (separate PD rights apply, or may not apply)
• Restrictive covenants or deed of easement (these are private law matters, not planning)

Single-Storey Rear Extensions (Class A)

The most commonly used PD right for householders. A single-storey rear extension is permitted if:

• It does not extend beyond the original rear wall of the house by more than 3m (semi-detached or terraced) or 4m (detached)
• It does not exceed 4m in height (or 3m if within 2m of the boundary)
• It does not cover more than 50% of the curtilage (garden) of the original house
• It is no higher than the eaves height of the original house (if within 2m of the boundary)
• The roof pitch and materials match or are similar to the main house
• The property is not in a conservation area, AONB, National Park or World Heritage Site

The Neighbour Consultation Scheme (larger home extensions): Extensions of 3–6m (semi/terraced) or 4–8m (detached) may also be permitted under a separate prior approval process, provided the LPA issues a prior approval notice after checking no valid objections are raised by adjacent neighbours during a 42-day consultation period.

Two-Storey Rear Extensions (Class A)

Two-storey rear extensions almost never qualify for PD. Under Class A, a two-storey rear extension would need to be limited to 3m depth (4m for detached) and must not be within 7m of the rear boundary. In practice, these conditions together mean that a full two-storey rear extension will almost always require full planning permission.

Side Extensions (Class A)

Side extensions are more restricted under PD. A single-storey side extension is permitted provided:

• It is no wider than half the width of the original house
• It does not exceed 4m in height
• It does not extend beyond the front wall of the original house
• The property is not in a designated area (conservation area, AONB, etc.)

Two-storey side extensions are not permitted under PD — they always require planning permission.

Loft Conversions and Roof Extensions (Class B)

Loft conversions are permitted under Class B provided:

• The additional roof volume does not exceed 40 m³ (semi-detached or terraced) or 50 m³ (detached)
• No part of the extension is higher than the original ridge line
• The extension is not on a side elevation facing a highway
• Any side-facing roof windows are obscure-glazed and non-opening below 1.7m above the floor
• The property is not in a designated area

Outbuildings, Garden Rooms and Garages (Class E)

Outbuildings within the curtilage of the house (not forward of the principal elevation) are permitted provided:

• Maximum height: 4m (dual-pitched roof) or 3m (any other roof) — or 2.5m if within 2m of the boundary
• They are single-storey only
• They do not cover more than 50% of the curtilage (combined with all other outbuildings and extensions)
• They are not used as a separate dwelling (e.g. they must be incidental to the main house)
• They are not in front of the principal elevation

Porches (Class D)

A porch is permitted under PD if:

• The ground area is no more than 3 m²
• The maximum height is no more than 3m
• It is no closer than 2m to the boundary with a highway

Driveways and Hardstanding (Class F)

Driveways do not normally require planning permission, but if the area is more than 5 m² and is impermeable (solid concrete or block paving without gaps), you must use permeable materials or provide adequate drainage. This rule was introduced to reduce urban flooding.

Solar Panels (Class J)

Solar panels on the roof or walls of a house are generally permitted under PD provided they do not project more than 200mm from the roof or wall surface and are not on a listed building or in a World Heritage Site. No panel may be higher than the highest part of the existing roof (excluding chimney stacks).

Article 4 Directions: When PD Rights Are Removed

A local planning authority can make an Article 4 Direction to remove specific PD rights from a defined area. This is most commonly used in conservation areas where the character of the area could be harmed by otherwise permitted development. If an Article 4 Direction applies to your property, you will need planning permission for works that would otherwise be PD.

Before starting any extension or alteration, check with your LPA whether any Article 4 Directions apply to your street or area.

Lawful Development Certificates: Confirming Your PD Rights

Even where PD rights apply, it is strongly advisable to apply for a Lawful Development Certificate (LDC) before or after completing the works. An LDC is a formal legal certificate from the LPA confirming that the development was lawful. Without it, you rely on your own judgment that PD applied — which may be challenged on sale or if a neighbour complains.

Crown Architecture prepares and submits LDC applications as part of our standard service for extensions and outbuildings.

Frequently Asked Questions

What is the “original house” for PD purposes?

The “original house” means the house as it was on 1 July 1948 (or as first built if constructed after that date). Any previous extensions already built form part of the current house but do not extend the PD allowance. This means PD depth measurements must be taken from the original rear wall, not the current rear wall if it has already been extended.

Can my neighbour stop me using my PD rights?

Generally, no. PD rights are a legal entitlement — your neighbour’s consent is not required. However, under the Neighbour Consultation Scheme (for larger extensions), a valid planning objection from a directly adjoining neighbour can prevent the scheme proceeding as PD and require a full planning application instead.

Does my property have PD rights if I live in a flat?

The standard householder PD rights described above do not apply to flats and maisonettes. Flats have separate PD rights which are more limited. Extensions to the building itself require planning permission from the landlord and likely the LPA.

Can Crown Architecture advise on whether my project qualifies as PD?

Yes — PD assessments are a standard part of our service. We will review your property, the proposed works and the applicable PD criteria to give you a clear opinion on whether permission is required, and apply for a Lawful Development Certificate if appropriate. Call 07443 804841 to discuss your project.

Get Clear Advice on Your PD Rights

Permitted Development rules are detailed and frequently amended. Crown Architecture & Structural Engineering provides clear, accurate advice on PD rights for residential projects across the UK — saving you the time and cost of an unnecessary planning application while protecting you against the risk of enforcement.

Call 07443 804841 or use the form above to get started.