House Extensions Holland Park

GS Renovation plans and builds extensions across Holland Park, from rear and side-return additions to full wrap-arounds on the area's period houses. We handle the groundworks, the steelwork, the roof and the full fit-out as one accountable project.

In Holland Park, 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 Holland Park: the structural engineer we appoint designs the structure, we build it, and building control signs it off.

Side-return extensions in Holland Park

On the terraced streets of W11 the usual extension fills the side return, that narrow strip of outside space running alongside the rear closet wing. Infilling it widens a cramped galley kitchen into a bright, open-plan room, often with rooflights and bifold or crittall-style doors onto the garden. We dig and pour new foundations, build up the walls and tie the new roof neatly into the existing back addition.

Because these plots sit within the dense W11 streetscape, we plan access, scaffolding and material deliveries carefully and keep the party wall with each neighbour protected throughout. A steel beam almost always forms the new opening between the old and new space, sized by an engineer and signed off by building control alongside the rest of the works.

Housing in Holland Park

On the valuation list Holland Park counts about 4,280 homes, 81% flats and 19% houses; 67% predate 1919, 4% are interwar and 28% post-war. A flat in Holland Park has no householder permitted development rights, so extending one needs planning permission and the freeholder's consent, which matters here because most homes are flats.

Where a Holland Park rear extension has to stop

For the 19% of Holland Park homes that are houses, the depth of a rear or side infill extension is set less by the garden than by the houses on either side. Under Policy CL9 of the Consolidated Local Plan, an extension that pushes further back than the general rear building line set by the neighbouring extensions is resisted. The council's plan has since been reviewed, with the New Local Plan Review recorded as adopted from 24 July 2024, so the designer checks the current wording of that test. On a terrace that line is read along the row. Beside a detached or semi-detached villa, a type that makes up 3% of the stock, there may be only one neighbour to read it from, and the gap between houses is itself part of what the drawings have to respect.

So the first survey work happens outside the site. We measure how far each neighbouring extension projects, from the garden and from upper windows, and plot those lines on the existing drawings before the designer starts. Houses on garden squares need the view from the square considered as well, because a rear elevation there is seen from every house around it. Once the footprint is fixed within that line, the structural engineer we appoint designs the foundations and steel to it, and party wall notices, which the building owner serves, go out on those final drawings rather than an earlier sketch.

Planning and permitted development in W11

Whether your Holland Park extension is permitted development or needs a full planning application depends entirely on the property. Many single storey rear extensions fall under permitted development rights, but Holland Park sits within the Royal Borough of Kensington and Chelsea, an area with conservation designations and many protected buildings, so those rights are often restricted and a planning submission to the council may be required.

We assess your specific house early, tell you honestly which route applies, and where an application is needed your architect or designer prepares it; we can recommend one and coordinate with them. Structural elements such as foundations and beams always need building regulations approval regardless of the planning position. Keeping these two approvals clearly separate, and starting both at the right time, is what keeps a Holland Park extension moving without costly surprises.

Kitchen extensions in Holland Park

81% of homes in Holland Park 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 19% of homes that are houses. The fit-out is priced on its own page, kitchen renovation in Holland Park; the build figures are in the table above.

Double storey extensions in Holland Park

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 Holland Park often needs planning permission from the Royal Borough of Kensington and Chelsea. It is a job for the 19% of homes that are houses; a flat cannot add a storey this way. The Holland Park Conservation Area was designated in 1981 when two smaller conservation areas were amalgamated (council source). Our double storey extension page explains the build, at £1,800 to £2,600 per m² across both floors.

• Brickwork and mortar matched to the existing elevation
• Wrap-around extensions and infills
• Party wall process explained, and the extension built to the award

VOA Council Tax stock of properties, March 2025, for Holland Park. Counts rounded by the VOA.

Alongside house extensions in Holland Park, the pages that usually help next are RSJ and steel beam installation in Holland Park, house extensions across Kensington and Chelsea, wraparound extensions, a garage conversion instead, house extensions across London and Basement Conversion Cost.

Why Choose GS Renovation in Holland Park

Holland Park homeowners choose GS Renovation because we manage the whole extension under one roof, coordinating the design and the council planning where it applies, then building the structure and the finish. You deal with one experienced team who understand W11's period stock and the Royal Borough's rules, backed by our founder's 30+ years of building.

• Building control inspected at foundation, damp course and steel stages
• Building control applications and inspections coordinated for you
• Programme planned around party wall notice periods before excavation near a neighbour

Checked by Abdelaaziz Saaid, founder and director of GS Renovation Ltd (Companies House no. 14611254). Structural design is by the consulting engineer appointed to your project.