Kitchen Extensions Hounslow
Rear, side return and wraparound kitchen extensions in Hounslow, the room, the services and the kitchen built as one job.
- Rated 4.9 from 31 reviews on MyBuilder
- London guide: £45,000 to £97,500
- Free site survey, itemised quote
A kitchen extension in Hounslow starts with the type of home you have. Hounslow Council's residential extension guidelines set a maximum single storey rear depth of 3.05m for a terraced house, 3.65m for a semi and 4.25m for a detached house where planning permission is needed. In the borough 26% of homes are terraced houses and 23% semi-detached or detached, while half are flats, which have no householder permitted development rights. We build the shell, the steel into the back of the house and the new kitchen as one programme, to your designer's drawings.
In Hounslow, a rear kitchen extension of about 30 square metres typically costs £45,000 to £97,500 excluding VAT, or £60,000 to £100,000 for a side return (indicative London ranges, Resi, MyBuilder and Checkatrade, 2026). GS Renovation Ltd, a building contractor based in Potters Bar, does the work in Hounslow: the structural engineer we appoint designs the foundations and steel, we build the room and fit the kitchen, and a registered electrician certifies the electrics.
Price guide
| Work | Indicative London range |
|---|---|
| Rear kitchen extension, about 30 square metres, ex VAT | £45,000 to £97,500 |
| Side return kitchen extension, standard to high specification | £60,000 to £100,000 |
| Wraparound kitchen extension, standard to high specification | £80,000 to £130,000 |
| Side return build rate, per square metre of new floor | £2,400 to £3,200 |
| Kitchen supplied and fitted within the extension | £5,000 to £14,000 |
| Structural engineer's fee | £950 to £2,500 |
Indicative London ranges (Resi, MyBuilder and Checkatrade, 2026), not a quotation. Prices checked September 2026. Full breakdown: Extension Cost and Planning Guide.
Quick estimate for Hounslow
Hounslow range: choose above
How deep can a Hounslow kitchen extension go?
The guideline depth is the starting point for any rear kitchen extension in Hounslow that needs planning permission. For a terraced or end terrace house the figure is 3.05m, for a semi-detached house 3.65m and for a detached house 4.25m. The council adopted its Character, Sustainability and Design Codes SPD as of 14 May 2024, and it supersedes the Residential Extensions Guidelines SPD (2017). Your designer confirms the depth against the current code, draws to it, and we set out the footings against the same line on the first day.
Depth drives more than floor area. It fixes where the roof lights land over the worktop, how far daylight reaches the old middle room, and how long the steel across the back of the house has to span. A 3.05m extension on a narrow terrace usually wants its glazing in the roof. A deeper semi can take a wider rear opening and a dining table under the glass. Settle the depth before you choose units, because the kitchen plan follows it.
Housing in Hounslow
The Council Tax list puts Hounslow at about 111,270 homes, 50% flats against 50% houses; 16% went up before 1919, 28% between the wars and 55% after 1945. A terrace kitchen extension in Hounslow starts in a narrow side return, and 26% of homes here are terraced.
Side infill beside a terrace outrigger in Hounslow
A side infill beside the back addition can run past the guideline depths in Hounslow, but only in a low form on the boundary. The guidelines say that in that case the eaves on the shared boundary should not exceed two metres and the roof pitch should not exceed 45 degrees. That shapes the whole room: a sloping glazed or tiled roof rising away from the neighbour, with the height gained on your side of the plot.
On site this means the boundary wall is built low and the rafters or glazing bars climb from it towards the outrigger wall. A wall built on or astride the boundary is notifiable under the Party Wall etc. Act, and you, as building owner, serve that notice before work starts. The boundary gutter needs a route for its water that does not cross the neighbour's land. Inside, the lower edge suits base units and the higher side takes wall cupboards or the tall oven housing.
Drains under the new kitchen floor
A public sewer near the back of the house changes the approval route before any digging starts. Where Hounslow is your building control body, it requires a full plans application, not a building notice, for an extension built over or within 3m of a public drain or sewer shown on the Thames Water sewer map. If a shared run passes close to the kitchen wall, the drainage search comes before the building control choice, not after.
When the sewer is close, the foundations are designed around it and Thames Water's own consent may be needed for building over it. We expose the run early, record its depth and condition, and follow the detail on the approved plans for bridging or diverting it. The new sink, dishwasher and any utility room then connect into a system that has already been checked. Finding the sewer after the slab is poured stops the job while the detail is redesigned.
Roof terraces, flats and Hounslow's design code
The flat roof over a new kitchen is not an easy extra terrace in Hounslow. The residential extension guidelines warn that using the flat roof of a single storey rear extension as a balcony or roof terrace is likely to harm neighbours' privacy, and such schemes are normally refused. Assume the answer is no before you draw it. Plan the roof as a roof: roof lights, a sedum or membrane finish, and access only for maintenance.
Flats are a separate case. Householder permitted development rules for extensions apply to houses only and not to flats and maisonettes, so a ground floor flat needs planning permission for any kitchen extension, and normally the freeholder's consent under the lease as well. The same depth, boundary and roof terrace points still shape the design, so ask your designer to draw against the current design code when the application goes in.
- Wet underfloor heating laid in the new screed
- Foundations, drainage and slab with the kitchen services cast in
- Cooker hood extraction ducted through the roof or flank wall
VOA Council Tax stock of properties, March 2025, for all 29 statistical areas in Hounslow. Counts rounded by the VOA.
Why Hounslow Homeowners Choose GS Renovation
We run the build from the footings to the finished kitchen, so the steel, drainage, glazing, electrics and units sit in one programme with one site team. The structural engineer we appoint sizes the beam across the back of the house, and a registered electrician certifies the new circuits. You get a written sequence showing when the kitchen goes out of use, when the temporary sink goes in and when building control visit, so you can plan family life around the noisy weeks.
- Honest updates if a date or a detail has to move
- Screed left to dry before the kitchen floor finish goes down
- Building control and Part P certificates handed over together at the end
George always kept to commitments and arrived on time. He offered helpful suggestions during his initial visit and promptly provided a reasonably…
The kitchen has been fitted to the high standard. Saaid was polite, professional, tidy, he pays attention to a little details that make huge…
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 Kitchen Extensions Hounslow
How do you price kitchen extensions in Hounslow?
The method for pricing kitchen extensions in Hounslow is deliberately dull: measure, scope, itemise, then compare with £45,000 to £97,500 excluding VAT for a rear kitchen extension of about 30 square metres (indicative). Nothing is quoted over the phone, because a blind figure changes later. GS Renovation allows for the post-war suburban construction at TW3 and prices building regulations approval covering the foundations, the steel into the house, the drainage and the cooker extract under Part F as its own line.
How far can a rear kitchen extension on a Hounslow terraced house go?
Under Hounslow's residential extension guidelines, 3.05m for a terraced or end terrace house where planning permission is needed. Without an application, permitted development allows three metres beyond the original rear wall. With prior approval, and outside Article 2(3) designated land such as a conservation area, that limit rises to six metres. Your designer picks the route, and the steel, roof lights and kitchen layout are planned inside that footprint.
Can the flat roof of a Hounslow kitchen extension be used as a terrace?
Probably not. Hounslow's residential extension guidelines say a flat roof used as a balcony or roof terrace is likely to harm neighbours' privacy, and such schemes are normally refused. Treat the roof as a roof, with roof lights and a maintenance hatch at most. A terrace is a separate planning question for your designer to raise before anything is built.
Does a sewer near the back wall of a Hounslow house change the building control route?
Yes, where Hounslow is the building control body. It requires a full plans application, not a building notice, where an extension is to be built over or within 3m of a public drain or sewer on the Thames Water sewer map. Check the map and survey the run before you choose the route. The foundation design then follows the approved plans, and Thames Water may have its own consent to give.
Can a ground floor flat in Hounslow add a kitchen extension without planning permission?
No. Householder permitted development rules for extensions apply to houses only and not to flats and maisonettes. A ground floor flat needs planning permission for a kitchen extension, and normally the freeholder's written consent under the lease. Start with the lease and the freeholder, then the planning drawings, then building regulations. We build once all three are in place.
How high can a side infill kitchen extension be on the boundary in Hounslow?
Where an infill beside an outrigger runs past the guideline depths, its eaves on the shared boundary should not exceed two metres and its roof pitch should not exceed 45 degrees. The room gains height towards the outrigger, not towards the neighbour. That shape suits low base units on the boundary side and tall storage on the house side.
What can a detached house in Hounslow build under permitted development?
A single storey rear extension up to four metres beyond the original rear wall, and no more than four metres high, under national permitted development rules. With prior approval, and outside Article 2(3) land such as a conservation area, the depth can reach eight metres. In the Bedford Park and Gunnersbury Park conservation areas, Article 4 directions cover all properties, so check what they remove first. Your designer also confirms whether earlier extensions have used part of the allowance.
Where does the skip go for a Hounslow kitchen extension?
On the road under a licence from Hounslow Highways, or on your own land where the lorry can place it without crossing the pavement. Hounslow says skips must not be placed on a pavement or verge and skip hire companies must not cross the pavement to deliver them. A skip in a parking bay needs an approved parking bay suspension before the skip permit. We build those lead times into the start date.
How long is the kitchen out of use during an extension?
The old kitchen usually stays in use while the footings, drainage and walls of the new room go up. It comes out when the rear wall is opened and the steel goes in, and the new kitchen is fitted once the floor, plaster and first fix services are done. We set up a temporary sink and worktop for that gap and give you the dates in writing.
Every Service, One Team
More GS Renovation Services in Hounslow
One team for every GS Renovation service in Hounslow:
Same Service, Nearby Areas
Kitchen Extensions Near Hounslow
We carry out kitchen extensions across Hounslow and the surrounding areas. Explore a nearby location:
Ready to Start Your Hounslow Project?
Free, no-obligation quote for kitchen extensions in Hounslow.