Architect in Streatham | Loft Conversions, Extensions & Planning
RIBA-aligned architectural design, planning applications and structural engineering in Streatham and across London.
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Architect in Streatham | Loft Conversions, Extensions & Planning
RIBA-aligned practice | 300+ projects completed | 97% planning success rate | 5-star reviews | Serving Streatham and the wider London Borough of Lambeth area
Crown Architecture is a specialist residential and commercial architectural practice with deep experience working in Streatham. Whether you are planning a loft conversion, a house extension, a full renovation, or a new-build project, our architects understand the planning policies, conservation area rules, and design character of Streatham and the surrounding area.
We manage every step of the process from the initial feasibility study and concept design through to planning permission, Building Regulations approval, and contractor administration. One fixed fee, one point of contact, and a track record of getting planning consent first time.
Why Choose Crown Architecture in Streatham?
Choosing the right architect in Streatham matters. Lambeth Council has specific planning policies and design expectations for this area, and a poorly prepared planning application can face refusal, delay, or costly amendments. Crown Architecture brings three key advantages to every Streatham project:
- Local knowledge: We have prepared planning applications approved by Lambeth Council for projects in Streatham and surrounding neighbourhoods. We know the planners’ priorities and the design character that Lambeth Council expects new development to respond to – whether that is the Large Victorian and Edwardian semis and villas; the Streatham Park area has fine early 20th-century detached houses that defines the area.
- Fixed fees, no surprises: Every client receives a fixed-fee proposal before work begins. Our fees are transparent and include all revisions until planning permission is secured.
- Full service: Crown Architecture prepares planning applications, liaises with Lambeth Council case officers, attends pre-application meetings where appropriate, and provides contract administration during construction.
Our Architectural Services in Streatham
Loft Conversions in Streatham
The Large Victorian and Edwardian semis and villas in Streatham are typically well suited to loft conversion. Depending on the roof type, a loft conversion can add a bedroom, a home office, or a bathroom to your home without using any garden space. The most popular types in Streatham are dormer loft conversions and hip-to-gable conversions.
Many loft conversions in Streatham qualify as Permitted Development under Class B, though properties in conservation areas, flats, and maisonettes require full planning permission. Crown Architecture advises on the most appropriate route for your specific property.
A loft conversion in Streatham typically costs between £40,000 and £80,000 for the construction works, depending on size and specification.
House Extensions in Streatham
A well-designed house extension transforms how you use your home and adds significant value. In Streatham, the most popular extension types are single-storey rear extensions, side return infills, and wraparound extensions. Many properties in Streatham can accommodate an extension under Permitted Development, subject to size limits and Lambeth Council Prior Approval notification.
Crown Architecture designs extensions that respect the character of Streatham’s Large Victorian and Edwardian semis and villas, respond sensitively to neighbouring properties, and comply with Lambeth Council’s planning policies.
Planning Applications in Streatham
Crown Architecture prepares and submits planning applications to Lambeth Council on behalf of homeowners and developers in Streatham. Our planning application service includes:
- Measured survey of the existing property
- Existing and proposed drawings (location plan, site plan, floor plans, elevations, sections)
- Design and Access Statement addressing Lambeth Council’s policies
- Submission to the Lambeth Council planning portal and liaison with the case officer
- Responding to any queries during the determination period
Full Architectural Service
For larger projects, Crown Architecture offers a full architectural service from concept to completion, including detailed design, specification, tender drawings, contractor procurement, and contract administration. This service is available for full house renovations, new-build dwellings, commercial fit-outs, and development projects in Streatham.
Planning in Streatham: What You Need to Know
Lambeth Council operates as the planning authority for Streatham. Key considerations for residential development include:
- Conservation areas: Streatham has conservation areas where permitted development rights are reduced or removed. Works that would normally not need planning permission may require a householder application in designated conservation areas.
- Permitted development: Homeowners in Streatham can often extend, convert lofts, and add outbuildings under Permitted Development rights. Crown Architecture checks your specific property’s permitted development position as part of every feasibility assessment.
- Neighbour consultation: Larger extensions require Lambeth Council to notify adjoining owners. Crown Architecture manages this process on your behalf.
- Article 4 Directions: In some parts of Streatham, Lambeth Council has issued Article 4 Directions that remove certain permitted development rights, typically in conservation areas and HMO-controlled zones.
Transport and Location
Streatham is served by Streatham Hill, Streatham Common and Streatham National Rail stations, making it well connected to central London. Crown Architecture has completed projects throughout Streatham and in neighbouring areas including Balham, Tooting, Norbury, Brixton, Tulse Hill.
What Our Streatham Clients Say
Crown Architecture handled our planning application with Lambeth Council from start to finish. They knew exactly what the planners would want to see and we got consent on the first application. Excellent communicators throughout.
We used Crown Architecture for our rear extension and loft conversion. The drawings were detailed and the planning process was completely handled for us. Highly recommend to anyone in Streatham looking for a reliable architect.
Outstanding service. Crown Architecture understood the local planning context immediately – including the conservation area constraints we were facing. We could not have got planning permission without their expertise.
Frequently Asked Questions – Architects in Streatham
Do I need planning permission to extend my home in Streatham?
In Streatham, many single-storey rear extensions up to 4 m (3 m for flats and maisonettes) can be built under Permitted Development rights without a full planning application, subject to a Prior Approval notification to Lambeth Council. However, properties in conservation areas, listed buildings, and flats require full planning permission for most external works. Crown Architecture reviews your permitted development eligibility as part of every initial consultation.
How much does an architect cost in Streatham?
Architectural fees in Streatham typically range from 8-15% of the total construction cost for a full service. For a single-storey rear extension costing £60,000, expect professional fees of £5,000-£9,000. Crown Architecture offers fixed-fee packages starting from £1,500 for planning drawing packages.
How long does planning permission take in Streatham?
Lambeth Council processes most householder planning applications within the statutory 8-week determination period. Applications in conservation areas or those requiring neighbour consultation can take 10-12 weeks. Crown Architecture prepares planning applications that comply with Lambeth Council’s Design Guide and Local Plan policies to minimise delay.
What is Lambeth Council’s planning policy on extensions?
Lambeth Council’s planning policies follow the National Planning Policy Framework (NPPF) and the London Plan. For residential extensions, the Council assesses impact on the character of the area, on the amenity of neighbouring properties (daylight, sunlight, privacy), and on protected trees or conservation area designations. Crown Architecture’s architects are experienced in designing within these policies.
Can Crown Architecture help with listed buildings in Streatham?
Yes. Crown Architecture has experience managing Listed Building Consent applications alongside planning permission. Listed buildings require separate consent for any works that affect their character as a building of special architectural or historic interest, both internally and externally. We work with heritage consultants where required.
Do I need a structural engineer as well as an architect in Streatham?
Yes – once planning permission is granted, Building Regulations approval is needed before construction begins. A structural engineer calculates the loads on new beams, foundations, and connections. Crown Architecture works with trusted structural engineers across Streatham and provides an integrated design service.
What types of projects does Crown Architecture handle in Streatham?
Crown Architecture handles the full range of residential architectural work in Streatham: loft conversions, rear extensions, side return extensions, wraparound extensions, basement conversions, full house renovations, new-build planning applications, and change-of-use applications.
How do I start a project with Crown Architecture in Streatham?
Contact Crown Architecture by phone on 07443804841 or email info@crownarchitecture.co.uk. We will arrange a free initial consultation at your property in Streatham, assess what planning route is most appropriate, and provide a fixed-fee proposal within 48 hours.
Related Pages
- Loft Conversion Streatham
- House Extension Streatham
- Architect in Balham
- Architect in Tooting
- Architect in Norbury
- Architect in Brixton
Contact Crown Architecture in Streatham
Phone / WhatsApp: 07443804841
Email: info@crownarchitecture.co.uk
Address: 71-75 Shelton Street, London WC2H 9JQ