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Architects in Richmond for House Extensions and Planning Applications

Planning permission, architectural design and project management 
delivered end-to-end by a multi-award-winning local team.

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Richmond Architects for Design, Planning Permission and Building Regulations

  • Planning applications handled for Richmond — council decisions arrive in 8 weeks standard.
  • PD rights apply widely; conservation areas in Richmond 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 47+ completed Richmond projects locally.

Extension Architecture handles planning applications, house extensions, and loft conversions across Richmond and the wider Richmond area, including TW9, TW10, TW1. 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.

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We only deliver excellence

47+
Projects completed in Richmond
2220 +
Our total projects completed in London & Surrey
Postcodes Served
TW9, TW10, TW1

Our Expertise

Council-ready planning application drawings

Planning Application Drawings
Council-ready drawings, fast

3D architectural visualisation of house extension design

3D Visualisations
See it before building

Retrospective planning application for unpermitted building work

Retrospective Planning
Fix unpermitted works

Building regulations compliant architectural drawings

Building Regulation Drawings
Safe, compliant drawings

Commercial development and change of use consultancy

Commercial Development Consultancy
Change of use experts

Interior design and architectural finishes

Interior Design
Finishes inside out

Spatial planning and room layout design

Spatial Planning & Layout
Smarter room layouts

Architectural feasibility consultancy for extensions

Feasibility Consultancy
Know what’s possible

Building in Richmond: Conservation Areas, Permitted Development and Planning Restrictions

Richmond’s vast open spaces, including the renowned Richmond Park and the distinctive Kew Gardens, combined with its rich historical and natural beauty, create an ideal setting for fascinating developments. This deep-rooted heritage has fostered a strong pro-conservation stance from the local authority, making the process of obtaining planning permission for house extensions and loft conversions in Richmond particularly complex yet evermore rewarding.

Richmond upon Thames is defined by landscape, heritage and architectural refinement. The presence of Richmond Park and the River Thames creates a setting where greenery, open views and natural light shape the character of every street.

The architectural fabric includes Georgian terraces, Victorian villas and substantial detached homes influenced by Arts and Crafts traditions. Proportion, material quality and rhythm are fundamental.

Unlike private estate locations focused on scale, Richmond values composure. New architecture must sit comfortably within conservation areas and established streetscapes. Height, massing and materiality are carefully assessed.

Richmond rewards design that feels settled and enduring. Successful projects enhance the relationship between house and landscape while preserving the quiet elegance that defines the area.

The borough’s unique village-like atmosphere is further enriched by the blend of Georgian, Regency, and Victorian architectural styles. To preserve and enhance its architectural and historical character, Richmond has designated 85 conservation areas, providing additional protection to buildings and sites of significant architectural merit.

Even if your property is not within one of the designated conservation areas, be aware that the planning department in Richmond will still present challenges in achieving your goals for your home. Extension Architecture is here to guide you through the process, ensuring you navigate these complexities with expert architectural advice. As a leading planning consultant in Richmond, we are adept at understanding these preservation efforts and ensuring that your projects align with the borough’s distinctive heritage.

  • Georgian and Victorian homes dominate TW9 — 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.
  • Richmond Council works to a clear 8-week householder planning decision timeline.
Richmond 03 Interior fit-out, Richmond

What Our Clients Say About
Extension Architecture

Richmond 02 Interior fit-out, Richmond

Do You Need an Architect or Planning Consultant in Richmond?

Currently, more and more people in the city choose to expand their houses, build additional floors in their lofts or just carry out renovations or refurbishments; they hope their property’s value will rise and their everyday comfort will improve if they decide to move, rather than buy a new home. Planning permissions in Richmond, however, are not always easy to determine since the borough contains 85 conservation areas – the largest conservation-area footprint of any London borough – aimed at preserving its distinctive architecture. It does not matter if your home is not located in a conservation area; there are times when Richmond’s planning department will put up obstructions that make attaining the home of your dreams just a tad more difficult.

Planning in Richmond is design led and context driven. Conservation policies, protected views and tree preservation regulations heavily influence outcomes.

Applications require a clear architectural narrative supported by accurate drawings and contextual justification. Rear extensions, loft conversions and basements must demonstrate sensitivity to neighbouring amenity and heritage impact.

We manage the full planning process, from feasibility assessment to submission and consultant coordination. Early strategic design decisions significantly improve approval prospects, particularly in conservation areas and near listed buildings.

Our experience enables us to balance ambition with compliance. By aligning architectural intent with planning policy from the outset, we strengthen both the application and the final built outcome.

Before and After: House Extensions in Richmond

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Before

Before

After 15

After

After

Why Choose Extension Architecture for Your Richmond Project?

Our experienced team of Richmond 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 clearand 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.

Architects Richmond

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 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 Your House Extension in Richmond Today

Planning a house extension in Richmond? Our local architects can guide you through every stage, from initial design and planning permission to construction.

Architectural design consultation and home extension planning services Architectural design consultation and home extension planning services Architectural design consultation and home extension planning services
Years of Experience

17

Any Questions?

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

Most single-storey rear extensions in Richmond may qualify as Permitted Development, meaning planning permission may not be required if the extension meets specific size and design limits. Under current rules, this is typically up to 6 metres deep for an attached house and up to 8 metres for a detached property. However, many areas of Richmond are within conservation areas, and Article 4 Directions can remove Permitted Development rights, meaning a full planning application to Richmond Council may be required. Extension Architecture checks your property address, planning history, and local restrictions free of charge before any design work begins, so you know the correct planning route from the start.
Richmond properties are well suited to several types of house extensions, including single-storey rear extensions, side returns, wraparound extensions, loft conversions, and double-storey additions where plot size allows. The area’s Georgian terraces and Victorian villas across TW9 and TW10 often require designs that respect existing architectural proportions, especially where properties are within conservation areas. The most suitable extension depends on your property layout, garden space, budget, planning constraints, and long-term goals. Extension Architecture assesses your home and recommends the most practical design approach with a free initial feasibility check.
If your property is located within a Richmond conservation area, you may need planning permission for external alterations that could otherwise fall under Permitted Development rules. This is because conservation areas have additional controls to protect historic character, and some streets may also be affected by Article 4 Directions that remove specific Permitted Development rights. Any extension or alteration must be designed carefully to respect the area’s architectural style and local planning policies. Extension Architecture checks your property’s conservation status, planning restrictions, and design requirements before preparing a suitable scheme, with a free initial feasibility check.
Richmond Council targets 8 weeks for a standard householder planning decision, measured from a valid application being received. Applications in conservation areas, or more complex schemes, can take up to 13 weeks. Once granted, permission remains valid for 3 years, giving you time to arrange finance and a builder. We handle council queries directly throughout, so delays are minimised on our end.
A good architect for a Richmond project should have strong knowledge of local planning requirements, especially conservation area policies, along with RIBA Chartered status, ARB registration, and experience securing approvals within the borough. Extension Architecture has completed 47+ projects across TW9, TW10 and TW1, achieved a 98% planning approval rate, and provides in-house structural engineering support. We offer a free feasibility check to review your planning options, site constraints and expected timescale before any fees are agreed.
A single-storey rear extension in Richmond typically costs from £2,000–£2,800 per m² for construction, with architect fees usually 8–15% of build cost depending on service level. A typical 20m² rear extension therefore runs from roughly £45,000–£60,000 including design fees, though conservation area requirements can add to design time and cost. We provide a free, no-obligation cost estimate based on your specific property and scope before you commit to anything.
An Article 4 Direction is a local planning measure that removes some or all Permitted Development rights on a specific street or area, usually to protect a conservation area’s character. In Richmond, several streets carry Article 4 restrictions, meaning even minor external changes need a full planning application. We check whether your address is affected as part of our free feasibility check.
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