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Architects in Oxshott for House Extensions and Loft Conversions

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

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Oxshott Architects for Single, Double Storey and Rear Extensions

  • Planning applications handled for Elmbridge — council decisions arrive in 8 weeks standard.
  • Green Belt and protected land affect extensions — full planning is often required.
  • 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 Oxshott projects locally.

Extension Architecture handles planning applications, house extensions, and loft conversions across Oxshott and the wider Elmbridge area, including KT22 and Stoke D'Abernon. Many streets keep Permitted Development rights, but Green Belt land often needs 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

19+
Projects completed in Oxshott
2220 +
Our total projects completed in London & Surrey
Postcodes Served
KT22

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 Oxshott: Green Belt Rules, Large Detached Homes and Loft Conversions

First recorded in 1179 in historical documents as Okesseta, Oxshott is now a pretty village that lies in the Elmbridge Borough of Surrey. The topography is essentially hilly and partly wooded. It presents an eclectic mix of neo-classical mansions to character-laden period homes. Over time, Oxshott has drawn quite a few celebrated sports personalities, such as Andy Murray, Didier Drogba, and John Terry. It is that part of the countryside that manages to achieve a perfect balance between rural life and access to all amenities available within central London. The area comprises the prestigious Crown Estate and is therefore one of the most sought-after locations south of the city.

At Extension Architecture, our Oxshott architects boast specific experience regarding residential extensions and new-build developments, offering a one-stop service from property acquisition to development. Our all-inclusive service encompasses intricate, spatial planning through to interior design, construction, and project management-a seamless, one-stop service devised to deliver truly exceptional, high-end results. Our experience and expertise encompass an extensive track record across Surrey and the Home Counties, including more than 80 projects approved in Elmbridge alone. We can thus help a lot in streamlining the planning process and enhancing the probability of success from the application.

  • Large detached homes dominate KT22 — ideal for rear and loft projects.
  • Green Belt and protected land restrict development — full planning is usually required.
  • Strong local demand means well-designed extensions consistently add lasting property value.
  • Elmbridge Council works to a clear 8-week householder planning decision timeline.
Haringey3 Interior fit-out, Oxshott

What Our Clients Say About
Extension Architecture

Haringey2 Interior fit-out, Oxshott

Architects for Oxshott Homes: Extensions, Garage Conversions And Garden Pavilions

Oxshott is distinguished by its private estates, mature woodland surroundings and exceptionally large plots. Unlike denser urban districts, Oxshott offers rare spatial freedom and with that freedom comes architectural responsibility. The homes here are substantial and often inspired by Palladian principles with symmetrical façades, balanced wings and grand entrances approached via long, tree lined driveways. Architecture in Oxshott is experienced gradually. Framed entrances, carefully orchestrated approach views and expansive forecourts create a sense of arrival before the residence is fully revealed.

Neo Classical detailing such as stone columns, pediments and strong cornice lines reinforces authority and permanence. The scale of land allows for composed architectural layouts including formal courtyards, landscaped symmetry and a clearly defined spatial hierarchy. Beyond the principal dwelling, ancillary buildings such as gatehouses, triple garages with staff accommodation and bespoke garden pavilions are common. The generous plot depths also allow for leisure focused design, with indoor pools, wellness suites and detached pavilions integrated discreetly within landscaped grounds. In Oxshott, the relationship between house and land is as important as the façade itself.

Before and After: House Extension in Oxshott

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Before

Before

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Why Choose Extension Architecture for Your Oxshott Home?

Our experienced team of Oxshott 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

Our in-house structural engineer—an advantage that only 1 in 20 firms can offer. This is crucial, as significant time is often lost consulting multiple specialists, which can lead to additional costs. With a structural engineer on our team, we ensure a fully collaborative and seamless design-build process, minimizing contingencies and preventing design inaccuracies.

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Interior Design + Architecture

Our team includes interior designers who work closely with the clients, especially the ‘ladies’ of the house to curate the dream spaces tailored to their requirements. These processes include fun yet crucial processes like selecting wall finishes, color schemes, soft furnishings, flooring. Having architects and interior designers under one roof allows for less contingencies.

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 Oxshott Today

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

Probably, yes. Most of Oxshott sits on Green Belt or otherwise protected land, so even a fairly modest extension usually needs a full application to Elmbridge Borough Council rather than qualifying under Permitted Development. There are streets outside those designations that keep their Permitted Development rights, but it genuinely varies house by house. Extension Architecture checks your specific address for free before any design work starts, so you know which route you’re on before spending anything.
It’s usually a single fixed fee rather than a percentage of your build cost, and it covers planning, design, and Building Regulations together. The actual number depends on the size and complexity of the job — a single-storey rear extension will cost far less to design than a double-storey or wraparound scheme. Extension Architecture gives a free, no-obligation quote based on your property and budget, so you’re not guessing before you commit to anything.
Yes, but there’s a ceiling: Green Belt policy generally only allows a proportionate increase over the property’s original floor area, and anything the council judges disproportionate gets refused. You’ll need full planning permission from Elmbridge — Permitted Development doesn’t apply on Green Belt land at all. Extension Architecture works out the realistic scale your plot allows before any fee is agreed, which is a big part of why the firm holds a 98% approval rate.
Elmbridge Borough Council aims for 8 weeks on standard householder applications, counted from when the application is validated. More complex Green Belt cases can stretch to 13 weeks. Once you get permission, it stays valid for 3 years, so there’s no rush to start building the day it’s granted. Extension Architecture tracks every application through the system and handles any council queries on your behalf.
Planning permission isn’t the last step — next comes Building Regulations approval, which covers the technical side: structure, insulation, fire safety, drainage. That’s a separate process from planning, and it’s where the detailed construction drawings get signed off. Once that’s done, building work can begin. Extension Architecture manages this stage too, so you’re not left figuring out what comes next on your own.
It’s not necessarily the end of the road — plenty of refused schemes get revised and resubmitted, or appealed to the Planning Inspectorate. In Oxshott specifically, refusals tend to be about scale or design rather than the principle of extending at all, given how much of the area is Green Belt. Extension Architecture designs around Elmbridge’s known policies from the start, which is why refusals are rare in the firm’s own numbers — a 98% approval rate across its projects.
Yes, in almost every case — beams, foundations, and loft conversions all need proper structural calculations, and that’s normally a separate professional’s job. Splitting that work across two firms can slow things down and cause the drawings and calculations to not quite line up. Extension Architecture keeps a structural engineer in-house, which only around 1 in 20 architecture firms actually offer, so both roles run under the same fixed fee and the same team.
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