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.

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. 🏠

Sometimes, the most successful extensions are the ones that feel like they were always meant to be there.This home grows...
03/02/2026

Sometimes, the most successful extensions are the ones that feel like they were always meant to be there.

This home grows quietly — not by overpowering what existed, but by working with it.
Brick extended with restraint.
A roofline lifted just enough to create space and light.
Openings carefully placed to connect inside and out without overstatement.
By day, the architecture reads calm and considered.
By evening, it softens — light spilling gently into the garden, revealing the depth and warmth of the spaces within.

Every decision here was intentional.
From proportions and materiality to how the house responds to its surroundings over time.
Because good architecture doesn’t announce itself.
It simply feels right.
—
Extension Architecture
Thoughtful design. Quiet confidence.

26/01/2026

A home doesn’t ask for more space.It asks for better proportions.For light that arrives softly and stays longer.For moments where inside and outside blur, not by accident, but by intent.For spaces that know when to open up — and when to hold you close.This extension was shaped around those quiet considerations.The way the ceiling lifts just enough to change how the room feels.How material tones stay restrained, letting texture and daylight do the work.How movement through the space feels natural, almost unremarkable — until you realise how calm it makes you feel.There’s no single feature competing for attention here.No moment asking to be admired.Just a series of thoughtful decisions, layered carefully, so the home works as a whole rather than a collection of parts.That’s where good architecture lives —in restraint,in balance,in the details you don’t notice straight away, but would miss if they weren’t there.At Extension Architecture, we design homes to age well.Spaces that feel grounded today, and still relevant years from now.Because when a home is designed with clarity, it doesn’t need to announce itself.It simply feels right.

23/01/2026

Some homes don’t need to be changed—only given space to unfold.

An extension, when approached with care, becomes less about adding area and more about recalibrating how a home is experienced. It begins with observing how light travels, how rooms are used, and where moments naturally gather. From there, decisions are made quietly—about proportion, flow, and continuity—so the new space feels inevitable rather than introduced.

The process itself is deliberately measured. Ideas are tested, refined, and resolved with clarity, allowing each stage to build calmly upon the last. Nothing is rushed. Nothing is imposed. The result is a space that feels settled from the outset—natural in use, composed in form, and enduring in character.

What matters most is not how much has been added, but how seamlessly it belongs. A home that breathes more easily. Rooms that feel calmer, brighter, and more intuitive to live in.

This is not about transformation for effect, but refinement with intent. Thoughtful extensions, shaped around the way people live—designed to remain relevant, comfortable, and quietly confident over time.

A quiet extension to a family home in Epsom.The brief was simple: create more usable space without disrupting the charac...
21/01/2026

A quiet extension to a family home in Epsom.

The brief was simple: create more usable space without disrupting the character of the house or the scale of the street. The solution sits comfortably within its context — considered in plan, measured in elevation, and resolved through clear, practical detailing.

From early studies to planning drawings, the focus remained on proportion and flow. The extension follows the logic of the existing house, allowing new spaces to feel familiar rather than added on. Internally, the layout opens up daily living areas while maintaining a sense of structure and order.

Light plays a central role throughout. Openings are positioned to improve daylight without overexposing the space, creating rooms that feel balanced at different times of day. Materials are restrained and durable, chosen to age well and support everyday use.

The completed project delivers more than additional square footage. It improves how the home works — connecting spaces, simplifying movement, and creating a calm backdrop for daily life.

A project shaped by clarity, careful decisions, and respect for what was already there.

— Project Bradstock Road, Epsom.

20/01/2026

At 1 Lambourne Drive, the space is designed to take on many lives. Fluid in character, yet grounded in warmth, it adapts gently to the moments it holds—much like water, but always calm, always comforting.

With the fireplace set into the wall, the room gathers itself in the evenings. Warmth becomes both visual and physical, anchoring the space without overpowering it. Full-height doors open directly onto the garden, allowing the boundary between inside and out to soften, so light, air, and greenery remain part of the experience throughout the day.
Above, the mezzanine looks on—not as a separate destination, but as a watchful presence. It becomes a place for shared rituals: sitting together to watch television, pausing for conversation, or simply being still in each other’s company. Even silence feels intentional here.
In the morning, the atmosphere shifts again. Sunlight moves through the room slowly, bathing surfaces in a softer glow and revealing a quieter side of the space. What remains constant is its adaptability—never fixed, never prescriptive. It allows the family to shape it as they need, holding both energy and rest with equal ease.
This is a room designed to support living, in all its forms.

08/01/2026

You can usually tell when a space is starting to feel right.

It happens somewhere between the sofa landing in just the right spot, the lamp warming the corner, and the fire quietly coming to life. The room slows you down a little. You stop scanning and start noticing — how the light softens the edges, how the proportions feel easy to be in, how nothing seems to ask for attention.

Being set beneath the mezzanine adds another layer to the experience. There’s a gentle sense of shelter without the space ever feeling closed in. You’re aware of the height above you, but you still feel held by the room — a balance that’s hard to get right and easy to appreciate when it is.

Everything feels calm and intentional. Storage stays in the background, furniture feels like it belongs exactly where it is, and the lighting quietly shapes the mood rather than announcing itself. The space doesn’t try to impress. It just feels good to be in.

And that’s usually the test. You start picturing real moments unfolding here — slow mornings, easy conversations, evenings drawn closer by softer light and a warm fire.

A space becomes part of everyday life and keeps getting better the longer you spend with them!

Every home carries a story — this one simply needed space to grow.From an existing house to a carefully considered wrapa...
06/01/2026

Every home carries a story — this one simply needed space to grow.
From an existing house to a carefully considered wraparound and loft extension, this project was shaped step by step around light, flow, and how the home would be lived in for years to come. What began as a modest footprint evolved into calm, generous interiors that connect effortlessly with the garden and respond beautifully to the changing hours of the day.

Throughout the process, design decisions were guided not by trends, but by proportion, natural light, and long-term value. Subtle detailing, integrated storage, and clean architectural lines allow the spaces to feel open yet grounded — modern, without losing warmth.

This is not just about adding square footage. It’s about creating rooms that feel intuitive, balanced, and quietly refined. Spaces that support everyday routines while elevating how the home is experienced.

At Extension Architecture, we specialise in thoughtful extensions that respect the existing house while unlocking its full potential — designing homes that feel complete, considered, and truly lived in.

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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