For many South West London homeowners, moving isn’t the answer — extending is. With property prices across SW postcodes making upsizing increasingly difficult, a well-planned house extension offers a practical, cost-effective way to create the space you need without the upheaval and expense of moving. At Braha Ltd, we design and build house extensions across SW London, from the Victorian terraces of Tooting and Balham to the family homes of Wimbledon and Putney.
We’ve been delivering extensions in this part of London for over 20 years. We understand the local planning context, the property types, and the typical structural considerations that come with extending a period home in the SW postcode belt — and we manage every aspect of your project from initial design through to final decoration.
Types of House Extension We Build
Single-storey rear extension — The most common extension type in SW London terraced houses, extending the rear of the property to create a larger ground-floor living space. Ideal for open-plan kitchen-diners and family rooms.
Side return extension — Filling in the narrow side passageway common in Victorian and Edwardian terraces to create additional ground-floor width. Often combined with a rear extension as an L-shaped or wraparound project.
Wraparound extension — Combining a rear and side return extension to maximise ground-floor living space. One of the most transformative options for a standard Victorian terrace.
Double-storey extension — Extending upwards as well as outwards to create additional bedroom or bathroom space. Requires full planning permission and structural engineering.
Areas We Cover for House Extensions
We build house extensions across SW London, including in:
Earlsfield and Southfields, SW18
Get in touch for a free consultation and quote.
FAQs — House Extensions SW London
Do I need planning permission for a house extension in SW London?
Single-storey rear extensions may proceed under Permitted Development in many SW London properties, subject to size limits (typically 3m for terraced/semi-detached, 4m for detached). Side return, wraparound, and double-storey extensions usually require a full planning application. Properties in conservation areas have more restricted PD rights. The relevant local authority depends on your postcode — Wandsworth Council covers SW17, SW15, SW18; Merton Council covers SW19, SW20.
How long does a house extension take to build?
A standard single-storey rear extension takes 10–14 weeks from groundworks to practical completion. Larger or more complex extensions take 14–20 weeks. The design and planning phase adds a further 8–16 weeks before building work begins. We provide a full project timeline before contracts are signed.
Can I stay at home during the extension build?
In most cases, yes. We work in a way that keeps your home habitable throughout the build, minimising disruption and maintaining safe access. There will be a period — typically 1–2 weeks during kitchen or utility connection work — where access to one area is restricted, and we'll plan around this with you in advance.
Will a house extension add value to my SW London home?
A well-designed, properly built extension consistently adds value in SW London's property market. Creating an open-plan kitchen-diner or adding a ground-floor bedroom and bathroom are among the highest-ROI improvements you can make. The exact uplift depends on your property and location, but most clients find that the extension adds more to their property's value than it costs to build.
