House Extensions Ealing
Single storey rear and double storey extensions in Ealing, 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 across Ealing to your designer's approved drawings, working with the generous plots of Edwardian villas and the tighter footprints of Victorian terraces in Acton and Southall. We handle foundations, steelwork, roofing and full fit-out so your extension is delivered by one team from groundworks to decoration.
In Ealing, 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 Ealing: 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 Ealing
Ealing range: choose above
Side-return and rear extensions in Ealing
The side return alongside the rear closet wing is the classic space to claim on an Ealing terrace. Infilling that narrow strip and extending to the rear turns a dark galley kitchen into a bright open-plan kitchen-diner. The work usually needs new foundations dug to a depth agreed with building control, steel beams to carry the existing rear wall, and a flat or pitched roof with rooflights to bring light deep into the plan.
On the wider Edwardian villas near Ealing Common and Walpole Park, there is often room for a more generous single or double storey extension. We match the new brickwork, reinstate cornicing and skirting where period rooms are affected, and tie the new structure into solid walls properly. Whether the plot is tight or generous, we sequence groundworks, steelwork and roof so the shell is watertight before the internal fit-out begins.
Housing in Ealing
The valuation list shows roughly 149,900 homes in Ealing, of which 28% are pre-1919, 30% interwar and 42% post-1945, split 54% flats to 46% houses. Since most homes here are flats, a flat in Ealing has no householder permitted development rights, so extending one needs planning permission and the freeholder's consent.
Designing an Ealing rear extension around SPD 4 and the inspection plan
Ealing's SPD 4 Residential Extensions gives the starting dimension: in most cases a single-storey rear extension with a maximum depth of 3 metres and a maximum height of 3 metres will be acceptable. Treat that as the envelope the designer tests first, not a limit to argue with. A deeper or taller scheme is not ruled out, but it has to justify its effect on the neighbours, which adds drawings and time. In a conservation area normal permitted development rights are restricted: side extensions and rear extensions of more than one storey need planning permission, and a single-storey rear extension keeps its allowance only where no Article 4 direction removes it.
Then plan the build around the inspections. Ealing's typical inspection service plan for a single-storey extension starts with commencement and excavations, then the DPC, floor damp-proof membranes and floor insulation. Each of those is covered up by the next trade, so each needs its visit before the following stage begins. We programme the trench dig, the concrete pour, the brickwork up to DPC and the slab around those visits, and hold the foundation concrete until the trenches have been seen. An Ealing extension built in that order has no reason to open anything up again.
Planning and party walls for Ealing extensions
Many single storey rear and side-return extensions in Ealing fall under permitted development, but this is not guaranteed. Larger schemes, double storey work, front extensions, side extensions in a conservation area and work to a listed house will need a full planning application to Ealing Council, and a listed house needs listed building consent too. We assess your specific house and postcode and advise honestly on which route applies; your architect or designer prepares the drawings and the application, so the design is approved before we build.
Extensions are also structural, so alongside any planning approval the work must meet building regulations, with foundations, steelwork and insulation inspected and signed off. Because Ealing terraces share party walls, excavating near the boundary or building off a party wall triggers the Party Wall Act, so you serve notices on your neighbours in advance (or your surveyor does). We coordinate building control and programme the build around the planning decision and the party wall notices, so nothing stalls the build.
Kitchen extensions in Ealing
54% of homes in Ealing are flats, and a flat has no householder permitted development, so a ground-floor flat's kitchen extension needs planning permission from Ealing Council and the freeholder's consent. Most kitchen extensions here are on the 46% of homes that are houses. The fit-out is priced on its own page, kitchen renovation in Ealing; the build figures are in the table above.
Double storey extensions in Ealing
Under permitted development a two-storey rear extension can go no more than 3 metres beyond the original rear wall and must stay at least 7 metres from the rear boundary, and in a conservation area it is not permitted development at all. Many gardens are too short for the 7 metre rule, so a double storey extension in Ealing often needs planning permission from Ealing Council. On the 28% of homes that are terraced, the neighbours' windows usually decide the depth. Ealing Council says the borough has 30 conservation areas (council source). Our double storey extension page explains the build, at £1,800 to £2,600 per m² across both floors.
- Drainage diversion and build-over agreements with the water authority
- Insulation, airtightness and thermal detailing to regulations
- Trial holes to set foundation depth near drains and trees
VOA Council Tax stock of properties, March 2025, for all 41 statistical areas in Ealing. Counts rounded by the VOA.
The GS Renovation Difference in Ealing
Ealing homeowners trust GS Renovation because we deliver the whole extension, foundations, steel, roof and fit-out, as one accountable project backed by our founder's 30+ years on the tools. We advise honestly on permitted development versus planning, handle building control and match new work to the character of your Victorian or Edwardian home.
- Building control inspected at foundation, damp course and steel stages
- Site left safe and secure at the end of every day
- Programme planned around party wall notice periods before excavation near a neighbour
Built a new extension at rear of property. Laid foundations, drainage, raised floor, new roof and completed all fixtures and interior decoration…
The kitchen has been fitted to the high standard. Saaid was polite, professional, tidy, he pays attention to a little details that make huge…
Saiid did a complete refurbishment of our small bathroom. This involved ripping out the existing bath/shower, basin, toilet, pipework, and tiles and…
FAQ
Frequently Asked Questions about House Extensions Ealing
What should I budget for house extensions in Ealing?
An Ealing budget for house extensions should sit within £2,000 to £2,800 per m² for a rear extension (indicative) and add a contingency for what the W5 survey cannot see. In mixed interwar and post-war housing the unknowns sit behind plaster and under floors, so GS Renovation prices what is visible and names the rest. The Ealing Council building control fee belongs in the same budget.
Does my Ealing side-return extension need planning permission?
Many single storey side-return and rear extensions in Ealing are permitted development, but side extensions in a conservation area, work to listed buildings, larger footprints and double storey schemes usually need a full planning application to Ealing Council. Either way the work must meet building regulations. We assess your house and postcode and tell you honestly which route applies before any work begins.
How deep will the foundations need to be for my Ealing extension?
That depends on the soil and the trees nearby. Much of Ealing sits on clay that shrinks and swells, and mature trees close to Walpole Park or older Hanwell streets draw moisture from it, so foundations are often taken deeper than standard. Building control inspects the trenches before concrete goes in, and the depth is agreed once the ground is exposed.
What if a drain runs under the site of my Ealing extension?
It is traced before the design is fixed. If only your house uses it, the run can normally be diverted around the new footprint, or protected through it, while keeping the Part H falls. If neighbours drain through it too, it is probably a public sewer, and the water company must consent before anything is built on or close to it. An early camera survey avoids redesigned foundations.
How is my Ealing extension kept warm enough to pass building regulations?
Part L sets insulation standards for new walls, floor and roof, and building control checks them. Large glazing and rooflights reduce what the rest of the envelope can lose, so the specification is balanced at design stage. Insulation is inspected before it is covered, and the new floor build up is set so it meets the existing floor level.
Can we stay in our Ealing house while the extension is built?
Usually, yes. The new walls and roof go up while the original rear wall is still standing, so the house stays weatherproof and secure. Only when the extension is closed in does the steel go in and the old wall come out, which is the noisy, dusty stage. We plan that week around your kitchen and a temporary cooking space.
Can an Ealing extension go ahead on a building notice if a sewer runs close by?
Not if it is close. Ealing rules out a building notice where an extension would stand over a public sewer or within 3.0m of one, as shown on the Thames Water Authority map of sewers. That moves the job onto a full plan application, which takes longer to approve. Get the sewer map and a drain survey before the designer fixes the footprint, because pulling the back wall in a little can sometimes keep the extension clear of that distance.
Does the floor area of an Ealing extension change the building control charge?
Yes. Ealing's domestic building control charges band extensions by floor area, with one charge for an extension of less than 40m2 and a higher one for an extension between 40m2 and 60m2. Any development including a basement extension is priced by quote on request. Where the design sits close to a band boundary, ask the designer to confirm the measured floor area before the application goes in, so the charge matches the drawings.
Could an Ealing extension approved after 1 March 2026 attract the Community Infrastructure Levy?
Check rather than assume. All CIL chargeable development granted planning permission in Ealing on or after 1 March 2026 is liable for a CIL charge, and Ealing's charging schedule sets separate residential rates for Central Ealing and for the rest of the LPA. Whether a particular extension is chargeable is settled against the regulations. Ask the planning agent to confirm in writing whether yours is, and whether any relief has to be claimed before work starts.
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