Extension Architecture and Interiors Ltd.

Extension Architecture and Interiors Ltd. Residential architects specialising in house extensions and bespoke homes.
Full-service architectural practice covering planning permission, design, and delivery.
Based in London | Working nationwide

Through all our stages of planning and design, we work with an experienced team of planners, architectural and interior designers and engineers to help the client in achieving the best possible solution in design to their proposed works. Our approach to work is to go above and beyond and achieve client satisfaction and approval. Based strategically in two locations we are able to deal with queries


quicker and efficiently throughout Central London, Greater London and Surrey. Any enquiries regarding your planning or even if you feel you just need some advice do feel free to contact us on 020 8288 8950, or sent in a brief email with your request to [email protected] We are always available to assist.
quicker and efficiently throughout Central London, Greater London and Surrey. Any enquiries regarding your planning or even if you feel you just need some advice do feel free to contact us on 020 8288 8950, or sent in a brief email with your request to [email protected]. We are always available to assist.

We’re delighted to share The Bosinney Project, beautifully captured by HomeInspireA sincere thank you to the HomeInspire...
27/07/2026

We’re delighted to share The Bosinney Project, beautifully captured by HomeInspire

A sincere thank you to the HomeInspire team for thoughtfully showcasing the vision, design and story behind this special home.

Watch the full video on YouTube: https://youtu.be/lSRPWiORSpc?si=FkfsfJXAEbxBpvb1

TheBosinneyProject

Step inside The Bosinney, architect Youno Kim's largest project to ...

26/07/2026

Simple Sketch to Ex*****on -THE BOSINNEY STORY

From stage zero, our principal designer Youno worked closely with Naz and Alicia to understand how they live, work, entertain and unwind.

Every space, detail and decision was shaped around their everyday needs, creating a home that feels considered, connected and completely personal.

This is more than a completed project. It is a home built for living.

25/07/2026

FROM ELEVATION TO REALITY.

Every successful interior begins with a clear design process.

For this bespoke staircase, we developed four distinctive design options, exploring materials, finishes, lighting and architectural details. Each concept was carefully refined around the client’s vision and the character of the space.

05/05/2026

A serene place to come home to.
Everything feels balanced, open, at ease.

Air moves freely,
and morning tea on the patio—
something you quietly look forward to.

29/04/2026

If you’re planning an extension in London, pause!

Start by defining what matters, understanding what’s possible, and avoiding early builder conversations without a clear scope.

Note: A structured start makes all the difference.

Link in bio.

24/04/2026

Thinking of extending your home? Don't skip the architecture stage. 📐

Good architectural planning means:
✅ Maximising your space
✅ Staying within budget
✅ Avoiding structural issues
✅ Smoother council approvals

The blueprint is everything. Build it right from day one. 🏠

Address

1st Floor, Cobden House, 231 Roehampton Lane
London
SW154LB

Opening Hours

Monday 9am - 6pm
Tuesday 9am - 6pm
Wednesday 9am - 6pm
Thursday 9am - 6pm
Friday 9am - 6pm

Telephone

+442034094215

Website

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