VARIANT 01 Single-storey extension
Open up the ground floor. Most often a kitchen-diner with bi-fold or sliding doors to the garden.
All services
SERVICES
House extensions in London
Single, double, side-return and wrap-around extensions designed and built end-to-end.
- Typical scope +18 to +60 m²
- Cost guide £2,500 – £4,000 / m²
- Build time 12 – 22 weeks
- Consult Free 1–2h on-site visit
Overview
A house extension is the biggest investment you can make in your home — it should transform how your family lives, not just add square metres. We design every extension around how you actually use your space, with a fixed, itemised price and stage-based payments so you stay in control from first sketch to handover.
Who it's for
Is an extension right for you?
Extensions earn their cost back when they unlock the way you want to live — not just when they add square metres. The homeowners who get the most value usually fall into one of these groups:
- Growing families who need a bigger kitchen, a dedicated dining space or an extra bedroom.
- Homeowners who love their area but want more room instead of moving and paying stamp duty again.
- Owners of Victorian or Edwardian terraces — side returns and rear gardens often unlock the most value.
- Downsizers future-proofing the house with ground-floor living, level access or a guest annexe.
Not sure which extension type fits your home? Our free on-site consultation sketches the options and walks through planning constraints before you commit to anything.
01 · Variants
Choose what fits your home.
Different houses, different streets, different families. We help you pick the right approach on the very first visit — based on plot, planning constraints and how you actually want to live.
VARIANT 01 VARIANT 02 Double-storey extension
Add a bedroom or bathroom upstairs while opening up the kitchen below. Maximum return on every square metre.
VARIANT 03 Side-return extension
Reclaim the alley beside your kitchen. The classic Victorian terrace transformation.
VARIANT 04 Wrap-around extension
Combine side and rear extensions into one bold, light-filled space.
02 · Process
From sketch to keys — five stages.
Every extension we deliver runs through the same five stages. One team across all of them — no juggling sub-contractors, no chasing decisions.
- 01
Free consultation
On-site visit, listen to brief, walk through what is possible.
- 02
Design & feasibility
Drawings, structural input, fixed-price route forward.
- 03
Planning permission
We handle the council, neighbours, paperwork.
- 04
Build
One project manager, in-house trades, weekly site updates.
- 05
Handover
Snagging, certificates, 10-year structural warranty.
04 · FAQ
Common questions.
The things clients usually ask before getting started.
Do I need planning permission for a house extension?
Many extensions fall under permitted development. We assess your property and tell you exactly what you need on the first visit.
How long does a typical extension take?
A single-storey extension takes 12–16 weeks from breaking ground to completion. Double-storey runs 16–22 weeks.
Can we live in the house during the build?
For most rear extensions, yes. We dust-seal the working area and maintain access to your kitchen and bathroom.
How much does an extension cost?
In London, expect £2,500–£4,000 per square metre for a finished extension including kitchen and finishes. Use our calculator for a free estimate.
05 · Where we work
Available across South West London and Surrey.
We deliver house extensions across 15 SW London neighbourhoods. Click your area for local case studies and planning context.
- Claygate KT10
- Thames Ditton KT7
- Walton-on-Thames KT12
- Farnham GU9
- Guildford GU1
- Virginia Water GU25
- Oxshott KT22
- Esher KT10
- Cobham KT11
- Weybridge KT13
- Ham TW10
- Kingston KT1
- Raynes Park SW20
- Wimbledon SW19
- Twickenham TW1
- Kew TW9
- East Sheen SW14
- Barnes SW13
- Richmond TW9
- Earlsfield SW18
- Tooting Bec SW17
- Balham SW12
- Clapham SW4
- Battersea SW11
- Wandsworth Town SW18
- Putney SW15
Get started
Ready to start your project?
Free quote in 2 minutes — no callbacks, no commitment. Or talk to a real human on 0800 0432 333.