Architects in Cobham for House Extensions, Loft Conversions & Planning Applications

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

Cobham Architects for House Extensions, Planning & Design

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 48+ completed Cobham projects locally.

Extension Architecture handles planning applications, house extensions, and loft conversions across Cobham and the wider Elmbridge area, including KT11, KT10, KT22. 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.

We only deliver excellence

48⁺

Projects completed in Cobham

2220 ⁺

Our total projects completed in London & Surrey

Locations in Cobham

Weybridge • Esher • Cobham • Walton-on-Thames • East Molesey • West Molesey • Hersham • Claygate • Oxshott

Postcodes Served

KT11, KT10, KT22

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

Recent Architect Cobham Extension & Loft Conversion Projects

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Planning in Cobham: Green Belt & Conservation Areas

Cobham blends countryside calm with international prestige. While surrounded by greenery, it has become synonymous with modern affluence and architectural ambition, largely influenced by its association with Chelsea F.C. and its global community.

Architecturally, Cobham is defined by scale and sophistication. Expansive gated residences and bespoke super-villas dominate the landscape, typically expressed through two languages: Neo-Classical elegance, with white render, symmetry and grand porticos; and Ultra-Modern precision, featuring flat roofs, floor-to-ceiling glazing, zinc cladding and clean geometry.

Beyond appearance, intelligence defines Cobham homes. Integrated security, electric gates, smart lighting, climate control and full home automation systems are now expectations rather than upgrades.

Yet alongside this contemporary growth, pockets of historic character and conservation sensitivity remain. Designing successfully here requires balancing innovation with context, respecting architectural surroundings while delivering modern luxury that feels confident, refined and technologically forward-thinking.

Detached and period homes dominate KT11 — 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.

Interior fit-out, Cobham

What Our Clients Say About
Extension Architecture

Interior fit-out, Cobham

Planning Applications &Architectural Services for Home Extensions in Cobham

Planning in Cobham requires more than compliance , it demands strategy. Large-scale homes, replacement dwellings and luxury extensions are carefully assessed for massing, visual impact and neighbourhood integration. Although parts of Cobham, including areas of the Old Village, carry conservation sensitivity, even non-conservation sites face detailed scrutiny. Scale, proportions and architectural language must be presented convincingly to achieve approval.

Our experience within local planning frameworks allows us to approach each project methodically. We analyse site context, neighbouring properties, council priorities and design impact before submission, significantly strengthening approval outcomes. Our services include replacement dwellings, bespoke new builds, high-specification extensions, basement leisure suites, loft conversions, full internal reconfigurations and smart home integration planning. By combining architectural ambition with planning intelligence, we ensure your project not only achieves visual excellence but progresses smoothly through the approval process with clarity, confidence and control.

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Before & After: House Extension Design & Build in Cobham

See Portfolio

Before

After

Why Choose Our Cobham Architects?

Our experienced team of Cobham 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.

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 Your Cobham House Extension or Loft Conversion 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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Architectural design consultation and home extension planning services

Years of Experience

17

Any Questions?

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

It depends on your street. If your property sits on Green Belt or protected land, which covers a large part of Cobham, you’ll usually need full planning permission from Elmbridge Borough Council, even for a fairly small extension. Outside those areas, many homes still have their Permitted Development rights, meaning you can extend without a full application. We check this for your specific address before any design work starts, and it costs nothing.

There’s no single number we can give you here, it really comes down to the size, spec, and type of extension, and Cobham’s mix of detached and period homes tends to push budgets a bit higher than the London average. What we do instead is give you a proper estimate based on your actual project. Our quote form takes under a minute and it’s free, with no obligation to go further.

Yes, you can, but there’s a limit. Councils generally judge Green Belt extensions against the size of the original house, so anything that looks disproportionately larger is likely to be refused. Full planning permission is required in almost every case. We look at your plot against current Green Belt policy and tell you honestly what’s realistic before you spend anything on design.

Elmbridge Borough Council usually decides on standard householder applications within 8 weeks of validation. If you’re in a conservation area or your project is more complex, expect closer to 13 weeks. Once you get permission, it’s valid for 3 years. We stay on top of the application the whole way through and deal with any council queries directly, so you’re not chasing anyone.

It’s not the end of the road, most refusals can be revised and resubmitted, and in some cases it’s worth appealing instead. In Cobham specifically, refusals tend to come down to a scheme being too large for a Green Belt plot or not accounting for how it affects neighbouring properties. We’ve kept our approval rate at 98% across our Cobham projects by working through these issues with the council before we ever submit, which is really where refusals get avoided in the first place.

We’ve worked on 48+ projects across Cobham and the wider Elmbridge area, part of over 2,220+ projects we’ve delivered across London and Surrey over 17 years. We’re RIBA-chartered and ARB-registered, and unlike most firms, we have a structural engineer in-house rather than outsourcing that work, which usually saves clients time and avoids extra fees. Every project starts with a free feasibility check so you know your options before committing to anything.

Architects in Cobham for House Extensions, Loft Conversions & Planning Applications