Architects for Extensions & Planning Applications  in Kingston

Planning permission, architectural design and project management delivered end-to-end by an experienced, RIBA-Chartered local team.

All In One Architectural Solution In Kingston Upon Thames

Planning applications handled for Kingston — council decisions arrive in 8 weeks standard.
PD rights apply widely; conservation areas in Kingston are more tightly restricted.
Full design, planning, and building regulations delivered together under one fixed fee.
Loft conversions available — Velux, dormer, and hip-to-gable options all designed in-house.
In-house structural engineer included — no separate specialist needed for your calculations.
A 98% planning approval rate achieved across 19+ completed Kingston upon Thames projects locally.

Extension Architecture handles planning applications, house extensions, and loft conversions across Kingston upon Thames and the wider Kingston area, including KT1, KT2, KT3. Most single-storey rear extensions are Permitted Development; conservation areas need planning. Our in-house structural engineer and RIBA-chartered team manage every stage, from survey to completion. Council decisions take 8 weeks. Get your free quote today.

We only deliver excellence

19⁺

Projects completed in Kingston Upon Thames

2220 ⁺

Our total projects completed in London & Surrey

Locations in Kingston Upon Thames

Kingston upon Thames • Surbiton • New Malden • Tolworth • Chessington • Coombe • Berrylands • Norbiton • Hook • Motspur Park (part)

Postcodes Served

KT1, KT2, KT3

Our Expertise

Planning Application Drawings
Council-ready drawings, fast

3D Visualisations
See it before building

Retrospective Planning
Fix unpermitted works

Building Regulation Drawings
Safe, compliant drawings

Commercial Development Consultancy
Change of use experts

Interior Design
Finishes inside out

Spatial Planning & Layout
Smarter room layouts

Feasibility Consultancy
Know what’s possible

Extension Architecture’s Gallery

What makes Kingston Upon Thames Special?

Kingston Upon Thames is one of London’s five Royal Boroughs, known for its historic riverside setting, vibrant town centre and diverse residential neighbourhoods. The borough combines the character of a historic market town with the convenience of modern London living, making it one of the most desirable areas for families and professionals alike.

The architectural landscape in Kingston is varied, ranging from Victorian and Edwardian houses to post-war developments and contemporary residential projects. Many areas within the borough are protected through conservation status, ensuring that their historic character and streetscape are carefully preserved while still allowing thoughtful modernisation and extension.

Kingston’s proximity to the River Thames, Richmond Park and a range of excellent schools contributes to its strong residential appeal. Properties often benefit from generous plots and garden space, creating opportunities for well-designed home extensions, loft conversions and internal reconfigurations that enhance both lifestyle and long-term property value.

Designing within Kingston requires an understanding of both planning policy and architectural context. Successful projects balance modern living requirements with respect for the borough’s historic identity, ensuring that new interventions complement the surrounding environment while improving the functionality and quality of the home.

Victorian terraces and 1930s semis dominate KT1 — ideal for rear and loft projects.
Conservation areas restrict PD on some streets — pre-application advice is recommended.
Strong local demand means well-designed extensions consistently add lasting property value.
Kingston Council works to a clear 8-week householder planning decision timeline.

Interior fit-out, Kingston

What Our Clients Say About
Extension Architecture

Interior fit-out, Kingston

Kingston Upon Thames Planning Applications And Architectural Services

Currently, many homeowners in Kingston are opting to expand their properties, whether by adding loft extensions, building additional floors, or undertaking major refurbishments. The goal is often to boost their home’s value while improving everyday comfort, rather than going through the hassle of purchasing a new property. However, planning permissions in Kingston can be tricky to navigate, particularly since the borough includes 26 conservation areas dedicated to preserving its distinctive architectural character.

Planning in Kingston Upon Thames requires careful strategy and a strong understanding of local planning policy. With numerous conservation areas and a rich stock of Victorian and Edwardian housing, planning applications are closely reviewed for scale, design quality and impact on neighbouring properties.

Homeowners often assume Permitted Development offers a simple route, yet in Kingston many proposals still require careful planning consideration. Loft conversions, rear extensions and internal reconfigurations must align with local planning guidance, daylight standards and the surrounding architectural context.

With over 17 years of experience navigating Kingston’s planning system, our team prepares strategic submissions supported by detailed drawings, planning knowledge and coordinated consultant input. Our architectural services cover extensions, refurbishments, internal reconfigurations and new build developments, ensuring every project balances design ambition with planning approval.

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Explore before & after visuals of our extension builder projects

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Before

After

Why Choose Extension Architecture?

Our experienced team of Kingston Upon Thames architects will take the lead and create a thoughtful design that maximizes the available space and is tailored to your tastes. We will guide you through the intricacies of the planning process and discuss every aspect of the project in detail. Our architects will carefully survey your property to ensure no detail is overlooked. We will be with you throughout the process, providing clear and comprehensive instructions while walking you through the planning, application and construction process.

One-Stop Solution

Our firm provides a comprehensive range of services under one roof, from planning and architectural design to intricate interior and immersive design, and expertly manages the complexities of the construction process. We have delivered projects of various scales and budgets, from small home extensions to large new builds, for a diverse clientele.

In-house Structural Engineer

We have a structural engineer in-house - something most architecture firms don't offer. It matters because juggling separate specialists costs time and money. With a structural engineer on our team, calculations and drawings stay coordinated under one roof, keeping the design-build process smooth and reducing errors.

Interior Design + Architecture

Our team includes interior designers who work closely with every client to curate spaces tailored to their taste and how they live. This covers the enjoyable but important decisions - wall finishes, colour schemes, soft furnishings and flooring. Having Kingston upon Thames architects and interior designers under one roof means fewer gaps and inconsistencies.

Turn-Key Approach

We provide support throughout the entire building process, embracing a ‘turnkey approach’ to ensure a smooth and efficient project from start to finish. Additionally, we assist in reducing build costs by aiding in the procurement of all internal fit-outs, including sanitaryware, kitchens, and more. It’s a zero hassle solution for clients.

Start Planning an Extension Home today

If you are planning a house extension in London, our architects can guide you through the entire process from concept design to construction.

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Years of Experience

17

Any Questions?

Didn’t find your answer? Feel free to reach out

Planning permission for a house extension in Kingston depends on your property type, location and the size of the proposed work. Many single-storey rear extensions may fall under Permitted Development rights and do not require a full planning application, but properties within Kingston’s conservation areas or areas affected by Article 4 Directions may have additional restrictions. Larger projects, including many double-storey extensions and side extensions, often require planning permission. We check your specific address and confirm the correct planning route before any design work begins, free of charge.

The best type of house extension in Kingston depends on your property’s age, layout, available space and planning constraints. Victorian terraces in KT1 and KT2 often suit side-return or single-storey rear extensions because of their narrower plots, while many 1930s semi-detached homes have additional side space that can accommodate wraparound or double-storey extensions. Loft conversions are also popular across both property types where roof structure and planning requirements allow. Extension Architecture reviews your plot, garden depth, neighbouring boundaries and budget during a free feasibility check to recommend the most suitable extension approach.

A standard householder planning application in Kingston upon Thames is usually decided within 8 weeks from validation, not submission. Applications in conservation areas or larger schemes may take up to 13 weeks. Once approved, planning permission is generally valid for 3 years. Extension Architecture manages the application process and responds to council queries throughout.

If a planning application is refused in Kingston, you can usually appeal to the Planning Inspectorate or submit a revised application that addresses the council’s concerns. Common reasons for refusal include issues with scale, overlooking, design, or impact on conservation areas. Extension Architecture helps review refusal reasons and prepare revised proposals that respond to planning requirements.

Architect fees for a house extension depend on the size of the project, complexity of the design, planning requirements and the level of support you need. Smaller single-storey extensions generally require fewer drawings and less design time, while larger projects such as double-storey or wraparound extensions involve more detailed planning, technical drawings and coordination. Fees are usually agreed as a fixed price and may cover concept design, planning applications, building regulations drawings and support through the project. Extension Architecture provides a tailored quote after reviewing your property, extension goals and planning requirements, so you understand the scope and costs before starting.

Yes, building regulations require structural calculations for any extension, which is separate work from architectural design. Using a firm with an in-house structural engineer, rather than outsourcing to a third party, typically speeds up the design process and reduces the risk of conflicting drawings between disciplines. This is an advantage fewer than 1 in 20 architecture firms offer in-house, and it’s included as part of our fixed-fee service rather than billed separately.

The most common mistake is assuming Permitted Development applies without checking, particularly in one of Kingston’s 26 conservation areas where PD rights are often removed or restricted. Other frequent issues include underestimating overlooking and daylight impact on neighbours, and submitting designs that don’t match the property’s existing character, which planning officers scrutinise closely in Kingston’s largely Victorian and Edwardian housing stock. We run a free pre-application check specifically to catch these issues before submission.

We’ve completed 19+ projects across Kingston upon Thames and the wider KT1-KT3 area, as part of over 2,220 total projects. Our team is RIBA-chartered and ARB-registered, includes an in-house structural engineer, and has achieved a 98% planning approval rate. We offer a free feasibility check covering your planning route, site constraints, and realistic timescale before any fee is agreed.

Architects for Extensions & Planning Applications  in Kingston