House Extensions Battersea
Single storey rear and double storey extensions in Battersea, planning, structure and build under one contract.
- Rated 4.9 from 31 reviews on MyBuilder
- Single-storey rear extension from £40,000
- Free site survey, itemised quote
GS Renovation builds extensions on Battersea's Victorian and Edwardian terraces, a minority among the flats of SW11. From side-return infills near Clapham Common to rear extensions backing onto quiet streets by Battersea Park, our founder's 30+ years of building means foundations, steelwork, roofing and fit-out are handled by one accountable team.
In Battersea, a single-storey rear extension typically starts from £40,000, or £2,000 to £2,800 per m² (indicative London ranges, Architecture for London, Resi, MyBuilder and Checkatrade, 2026). GS Renovation Ltd, a building contractor based in Potters Bar, does the work in Battersea: the structural engineer we appoint designs the structure, we build it, and building control signs it off.
Price guide
| Work | Indicative London range |
|---|---|
| Single-storey rear extension | from £40,000 |
| Rear extension, per m² | £2,000 to £2,800 |
| Side return, per m² | £2,400 to £3,200 |
| Wraparound, per m² | £2,400 to £3,200 |
| Double storey, per m² | £1,800 to £2,600 |
| Basement extension | see the basement page |
Indicative London ranges (Architecture for London, Resi, MyBuilder and Checkatrade, 2026), not a quotation. Prices checked September 2026. Full breakdown: Extension Costs & Planning.
Quick estimate for Battersea
Battersea range: choose above
Side-return extensions in Battersea terraces
On Battersea's terraces, the classic extension fills in the side return, that narrow strip of ground alongside the rear closet wing, to widen a cramped galley kitchen into a bright open-plan space. Because the return sits tight against the boundary, we underpin or form new foundations carefully, install steel beams to carry the existing rear wall, and often add a glazed roof to pull light deep into the plan.
These terraces sit close to their neighbours, so the Party Wall Act almost always applies where we build off or near a shared wall. You serve the notices as building owner, or your party wall surveyor does. We give you the drawings and programme they need, then protect the adjoining property and sequence the groundworks to keep disruption down. The result opens up the ground floor of a period SW11 house without losing the proportions and features that make these homes worth extending.
Housing in Battersea
Of the 33,740 homes the valuation list records in Battersea, 19% were built before 1919, 4% between the wars and 76% since 1945; 91% are flats and 9% are houses. Since most homes here are flats, a flat in Battersea has no householder permitted development rights, so extending one needs planning permission and the freeholder's consent.
Extending a house in Battersea's conservation areas and Article 4 estates
Houses make up only 9% of Battersea's homes, and before extending one the first question is whether its street is designated. In a conservation area, the council's list of works that need planning permission includes front and side extensions of one storey or more and two storey rear extensions. A side return infill is treated as a side extension, so there it needs an application, while a single-storey rear extension within the national limits can still be permitted development unless an Article 4 direction takes that right away.
The Latchmere Estate is where that happens. Its Article 4 direction brings extensions to the house, and porches at the front of the house, under planning control, so even a modest rear kitchen extension is an application. The council's appraisal treats the estate as a rare surviving group of traditional Battersea terraced streets, lying between Battersea Park Road and the main railway line. We ask for brick and roof samples to match the street before the drawings are submitted, because matching materials weigh heavily when an application on an estate like that is decided.
Planning and permitted development in SW11
Some extensions in Battersea fall under permitted development, meaning you can build within set size and height limits without a full planning application. Others need planning permission from Wandsworth Council, particularly larger rear or wrap-around builds, anything affecting the front elevation, side or two-storey extensions in a conservation area, or any house where an Article 4 direction removes the rights. We assess your specific house before committing to a route.
Whichever path applies, the structural and building regulations side is separate and always required. Foundations, steel beams, drainage, insulation and fire safety are all inspected by building control. We advise honestly on whether your Battersea project is likely to be permitted development or need an application, help with drawings, and build to the approved design so the finished extension passes inspection and adds lasting value.
Kitchen extensions in Battersea
91% of homes in Battersea are flats, and a flat has no householder permitted development, so a ground-floor flat's kitchen extension needs planning permission from Wandsworth Council and the freeholder's consent. With so few houses here, the realistic kitchen gain in most Battersea homes is a better layout inside the flat rather than an extension. The fit-out is priced on its own page, kitchen renovation in Battersea; the build figures are in the table above. Double storey extensions belong to the few houses here.
- Full fit-out, finishing and making good
- Single and double storey extensions
- Roof works and structural alterations at roof level
VOA Council Tax stock of properties, March 2025, for all 6 statistical areas in Battersea. Counts rounded by the VOA.
Trusted House Extensions in Battersea
Homeowners across Battersea choose GS Renovation because we take an extension from first sketch to final coat with one team. We know the side returns, closet wings and party walls of SW11 terraces, we coordinate the planning route and building control, and our founder's 30+ years on the tools mean the groundworks and steelwork are done right the first time.
- Foundation depth set after trial holes, drains and trees are checked
- Permitted development checked before you pay for a planning application
- One point of contact from first survey to handover
Built a new extension at rear of property. Laid foundations, drainage, raised floor, new roof and completed all fixtures and interior decoration…
George always kept to commitments and arrived on time. He offered helpful suggestions during his initial visit and promptly provided a reasonably…
George was brilliant. Lovely bloke, very reasonably priced and a perfectionist to boot. He completed our small kitchen renovation with care and great…
FAQ
Frequently Asked Questions about House Extensions Battersea
Which parts of a house extensions project in Battersea cost the most?
On a house extensions project in Battersea the approvals are a small line and the time on site the large one, within £2,000 to £2,800 per m² for a rear extension (indicative). The cost of permitted development or a planning application to Wandsworth Council is small next to labour, but skipping it costs a sale. The days on site are set by the property itself: the depth of neighbouring Battersea foundations decides how deep the new footings go.
Will my Battersea rear extension need planning permission or is it permitted development?
A flat has no permitted development rights to extend, but many single-storey rear extensions on Battersea terraces qualify within size limits. Larger builds and wrap-arounds need planning permission from Wandsworth Council, as do side or two-storey extensions in a conservation area; a single-storey rear extension there can still be permitted development unless an Article 4 direction removes it. Building regulations approval is separate and always required. We assess your home and advise on the route first.
Can I extend a ground-floor Battersea flat into the garden?
Only with planning permission, because flats have no permitted development rights to extend. Wandsworth Council decides the application. The lease matters too: the garden may be demised to you, but the external walls belong to the freeholder, whose written consent is required. Building regulations approval runs separately. With 91% of Battersea homes being flats, it is a question we are asked often here.
What foundations does a Battersea house extension need on clay?
Deeper than people expect. Battersea clay moves as it wets and dries, and roots from a nearby tree exaggerate that movement, which is why the engineer fixes the depth only after seeing the soil and noting every tree. Trial holes confirm it. An inspector looks into the open trench before any pour, and where the new footing goes below next door's within 3 metres, they get one month's notice.
What drainage issues arise when extending a Battersea terraced house?
The existing drain often runs exactly where the new room will sit. Where that pipe is a public sewer, the water company has the final word on building across or beside it. Chambers that finish up indoors are moved or given sealed double covers. Part H sets the falls for new runs. We survey the drains before drawings are fixed, because moving a run changes the design.
Does a Battersea side return extension on a house need a party wall notice?
Almost always. Where the house has a side return, the new wall sits on or close to the boundary, and its foundations are within 3 metres of next door and usually deeper than theirs, which requires one month's notice. If the design cuts into the existing party wall for a beam, a party structure notice is needed at least two months ahead. Your neighbour can consent or dissent.
Do Battersea neighbours need notice for a side return extension on the boundary?
Usually. A side return infill in a terrace is built on or against the line of the boundary, and its foundations are dug close to next door's, and both can fall under the Party Wall etc. Act. Wandsworth Council's party walls page says these matters are between adjoining owners and refers them to the government's explanatory booklet. You serve the notices as building owner, and we supply the drawings and foundation details they need.
Is the Shaftesbury Park Estate treated differently for a Battersea extension?
Yes. It is one of the eight conservation areas that Wandsworth Council names as carrying Article 4 Directions, alongside the Latchmere Estate. A direction removes permitted development rights that houses elsewhere keep, and each one covers its own list of works, which the council publishes with the direction. Read the Shaftesbury Park wording for your address before instructing drawings, and treat even a single-storey rear extension as a possible application until it has been checked.
Is written planning advice worth having before a Battersea terrace extension?
On a designated terrace it often is. Wandsworth's householder pre-application service offers a meeting and written advice, or a meeting only of up to 1 hour. The written version records what officers said about depth, height and materials, which the designer can then draw to and the neighbours can be shown. Bring a measured survey and photographs of the rear of the terrace, since the relationship with the houses either side is often the main point of discussion.
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