House Extensions Notting Hill
Single storey rear and double storey extensions in Notting Hill, 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 plans and builds extensions across Notting Hill, working with the Victorian stucco townhouses of W11 and the converted terraces near Holland Park. We handle groundworks, steel, roofing and full fit-out, and guide you through what the council will and will not allow.
In Notting Hill, 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 Notting Hill: 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.
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Notting Hill range: choose above
Rear and side-return extensions in Notting Hill
The most sought-after extension in Notting Hill opens the rear of a period house, often infilling the side return to widen a tight kitchen or drawing in more of the garden. On these Victorian plots we dig and cast foundations to suit the ground and any neighbouring walls, then tie the new structure into solid masonry with steel beams sized by a structural engineer and signed off by building control.
From closet-wing conversions to full wrap-around rear extensions, we manage the sequence from groundworks and drainage to roof, glazing and internal finishing. Rear gardens in W11 vary from generous to enclosed, so we plan access, spoil removal and party wall protection around a street where neighbours are close. The result is a light-filled rear space that respects the proportions of the original house.
Housing in Notting Hill
Notting Hill's housing, as the Council Tax list records it, is about 12,530 homes: 24% houses, 76% flats, with 75% pre-1919, 7% interwar and 17% built since 1945. Where most homes are flats, a flat in Notting Hill has no householder permitted development rights, so extending one needs planning permission and the freeholder's consent.
Measuring a Notting Hill rear extension against the neighbours
Where a rear extension needs planning permission, Policy CL9 of the Consolidated Local Plan resists one that goes past the general building line the neighbouring extensions have already established. On a Notting Hill terrace that line is set by what the houses either side, and further along, have already built, so the useful research happens before any drawing. Search the Royal Borough's planning register for the neighbours' approved extensions, photograph the rear of the terrace from the garden, and have the surveyor measure the adjoining projections. That evidence shows the depth an application can reasonably seek.
For the 24% of Notting Hill homes that are houses, the other way to add space is down, and Policy CL7 sets the limits there. Basements may take up no more than 50 per cent of each garden or open part of the site, and at least one metre of soil has to sit over any part of a basement under a garden. A rear extension with a basement under it has to satisfy both policies at once, so the extension footprint, any lightwell and the garden left over are drawn together rather than one after the other.
Planning and permitted development in W11
Whether an extension is permitted development or needs a planning application depends on the property. Most Notting Hill homes are flats, which have no householder permitted development. For a house, the conservation area covering much of W11 removes permitted development for side extensions, two-storey rear extensions and roof alterations, while a single-storey rear extension within the limits can still qualify unless an Article 4 direction removes it. A listed house needs listed building consent as well. We assess your address early so you know before spending on drawings whether the Royal Borough of Kensington and Chelsea must approve it.
Where planning permission is required, the application goes in on drawings from your architect or designer, and we work with them so the scheme is buildable and priced before it reaches the council. The structure, drainage and insulation also need building regulations approval, and where foundations or walls affect a neighbour you serve a party wall notice using the drawings we supply. Running building control, the party wall programme and construction together keeps a W11 extension moving without the usual gaps between separate trades.
Kitchen extensions in Notting Hill
76% of homes in Notting Hill are flats, and a flat has no householder permitted development, so a ground-floor flat's kitchen extension needs planning permission from the Royal Borough of Kensington and Chelsea and the freeholder's consent. Most kitchen extensions here are on the 24% of homes that are houses. The fit-out is priced on its own page, kitchen renovation in Notting Hill; the build figures are in the table above.
Double storey extensions in Notting Hill
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 Notting Hill often needs planning permission from the Royal Borough of Kensington and Chelsea. It is a job for the 24% of homes that are houses; a flat cannot add a storey this way. The Ladbroke Conservation Area was designated in 1969, one of the Royal Borough's earliest designations (council source). Our double storey extension page explains the build, at £1,800 to £2,600 per m² across both floors.
- Bi-fold, sliding and French door openings to the garden
- Full fit-out, finishing and making good
- Party wall process explained, and the extension built to the award
VOA Council Tax stock of properties, March 2025, for Notting Hill Gate, Notting Hill West and Notting Hill South. Counts rounded by the VOA.
Why Choose GS Renovation in Notting Hill
Extensions in Notting Hill live or die on the local detail, and that is where our founder's 30+ years on the tools counts. GS Renovation knows conservation and listed constraints in the Royal Borough, delivers the groundworks, steel and roofing to building control standard, and works with your designer on planning and programmes around your party wall notices. One accountable team from foundation to finish, with no surprises.
- Insulation and thermal detailing to current regulations
- Waste cleared as we go, not left piled up outside
- Building control inspected at foundation, damp course and steel stages
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…
It's the second time I have hired George and he has been absolutely professional and the work he did resembles perfectly what I had in mind. Being an…
FAQ
Frequently Asked Questions about House Extensions Notting Hill
Do you charge for a survey before quoting house extensions in Notting Hill?
GS Renovation charges nothing to survey a W11 property for house extensions, because pricing house extensions in Notting Hill unseen is guesswork. The visit confirms the scope, what approvals it needs (permitted development or a planning application to the Royal Borough of Kensington and Chelsea), and where in £2,000 to £2,800 per m² for a rear extension (indicative) the job sits. An itemised figure follows in writing. Call 07472 424 226 or email info@gsrenovationltd.co.uk.
Can I extend my Notting Hill house under permitted development?
Sometimes, but often not. Flats have no permitted development rights, and most Notting Hill homes are flats. For a house, the conservation area covering much of W11 removes permitted development for side, two-storey and roof extensions, though a single-storey rear extension within the limits can still qualify unless an Article 4 direction removes it. A listed house also needs listed building consent. We check your specific property against the Royal Borough's rules before design work begins, so you know whether a full planning application is needed rather than assuming.
Can a Notting Hill flat owner build a rear extension at lower-ground level?
Only through a planning application, because flats and maisonettes have no permitted development rights, and the freeholder's written consent is needed as well. The extension ties into a structure shared with every flat above, so building regulations approval, drainage for those flats and any party wall notices are all part of it. Most Notting Hill dwellings are flats, 76% on the VOA figures, so this route is common.
How do extension foundations deal with neighbouring walls in Notting Hill?
Carefully, because old period houses often sit on shallow footings. Where excavation comes within 3 metres of a neighbour's building and goes below its foundations, a notice goes out at least one month beforehand. The engineer may specify a foundation that avoids loading the neighbour's wall, and a schedule of condition records its state first.
Where does the drainage go under a rear extension in Notting Hill?
In a terrace, the drain from the back of the house can run under the building to the sewer at the front, and a rear extension may sit over part of it. Building over or near a public sewer needs the water company's consent, and any manhole in the footprint is relocated or rebuilt. A drainage camera survey confirms the route before the design is fixed.
How is a new extension tied into the old solid walls of a Notting Hill house?
With stainless ties or a starter system fixed into the old brickwork, and a movement joint where new meets old, since the new foundations settle differently. The damp-proof courses are lined up so moisture cannot bridge across. The new walls meet current Part L standards, and the junction is detailed so it does not become a cold, damp line inside.
How is a Notting Hill rear extension facing a communal garden judged?
With the garden in view. The Ladbroke Conservation Area Appraisal lists poorly designed rear extensions among the negative features affecting communal gardens. A communal garden is seen by every house around it, so the rear elevation carries as much weight as the front. Keep the extension low and subordinate, use materials that match the terrace, and include views from the garden in the application drawings so the design is assessed as people will actually see it.
Is CD 10 a new basement policy for Notting Hill homes?
No, it is the old one with a new number. The publication version of the New Local Plan Review saved the existing basements policy CL7 and gave it the new reference CD 10, and the national Planning Data record lists the plan as adopted with a start date of 2024-07-24. So the 50 per cent garden limit and the other CL7 tests still frame a Notting Hill basement. Check that any design statement quotes the current wording.
Is a Notting Hill extension liable for the Mayoral CIL?
Possibly, and the paperwork has to be right before work starts. Kensington and Chelsea is in Mayoral CIL charging Band 1. Whether a particular extension is liable turns on its new floor area and on any relief or exemption that applies, and exemptions generally have to be claimed before the work begins. Ask the designer to confirm the position against the drawings and file the forms in time, because a missed form can create a charge the scheme never needed to pay.
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