Kitchen Extensions Chiswick

A kitchen extension in Chiswick is one of two jobs. On the Victorian and Edwardian terraces of W4 it is a side return infill beside the outrigger, sometimes wrapped round the back; on a semi it is a straight rear extension across the width. Flats are the other half of the picture: 59% of homes in Chiswick are flats, and householder permitted development rights for extensions apply to houses only, so a ground floor flat needs planning permission for any extension. We build the shell, the steel into the house and the kitchen as one programme.

In Chiswick, 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 Chiswick: 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.

How far back a Chiswick kitchen extension can go

The depth is set by the house type first. Hounslow's residential extension guidelines give maximum single storey rear extension depths of 3.05m for a terraced house, 3.65m for a semi-detached house and 4.25m for a detached house. In Chiswick, 26% of homes are terraced houses and 15% are semi-detached or detached, so the terrace figure governs the largest group of houses. The permitted development limits are measured from the original rear wall, not from an earlier addition, so check what the house looked like as first built.

Infill beside an outrigger has its own rule. Where a side return infill runs past those depths, Hounslow's guidelines say the eaves on the shared boundary should not exceed two metres and the roof pitch should not exceed 45 degrees. That shapes the roof: a low eave against the neighbour, rising to a glazed slope or a lantern over the kitchen. For comparison, national permitted development allows a single storey rear extension of three metres beyond the original rear wall on a house that is not detached, and four metres on a detached house. Your designer settles which route the scheme takes before we price the steel.

Housing in Chiswick

By the valuation list's count, Chiswick holds about 16,410 homes, 41% houses and 59% flats; by age, 51% were built before 1919, 15% between the wars and 34% since 1945. Only a ground floor flat in Chiswick with its own garden can extend its kitchen, which matters here because most homes are flats.

Conservation areas and Article 4 directions change the Chiswick paperwork

Several parts of Chiswick carry designations that narrow the permitted development route. Strand on the Green Conservation Area was designated on 7 November 1968 and extended in 2001, and Old Chiswick Conservation Area on 1 May 1969. In a Hounslow conservation area, front and side extensions of one storey or more need planning permission, and national rules put every side extension on designated land into householder planning. For a side return kitchen, that means a planning application from the start, with drawings that show the new brick, slate and glazing against what is already there.

Bedford Park goes further. Hounslow has made Article 4 directions covering all properties in the Bedford Park and Gunnersbury Park conservation areas, and the Bedford Park Conservation Area appraisal records that its Article 4(2) Direction was made on 24 July 2001. On those streets, external changes that would pass without consent elsewhere in W4 can need an application. We build to the approved drawings and keep the approval and its conditions on site, so the brick bond, the joinery profile and the roof finish match what the planning officer signed off.

Drains, steel and the full plans route in Hounslow

A Chiswick kitchen extension can land on the drain. Rear gardens behind a terrace can carry shared runs, and Hounslow requires a full plans application, not a building notice, where an extension is built over or within 3m of a public drain or sewer. A registered building control approver is the other route. We ask for a drainage survey at the start, so the build over agreement with Thames Water and the plans approval run side by side. Moving a gully or an inspection chamber before the foundations go in costs less time than redesigning the footings once the trench is open.

The steel is the other structural piece. Opening the back of the house into the new room means a beam or a goalpost frame sized by the structural engineer we appoint, with padstones and temporary propping while the wall comes out. Steel bearing in a party wall is notifiable work, and the building owner serves the party wall notices. Where Hounslow is the building control body, it asks for inspection requests with at least 1 working day's notice, so we book the inspections into the programme. Hounslow issues a certificate of completion once the work is completed and inspected, and it goes in your file for any future sale.

Glazing, the roof and fitting the Chiswick kitchen in one run

The new room works when light comes from above as well as from the garden end. On a side return, roof glazing over the infill brings daylight into the middle of the house, which on a deep pre-1919 terrace is the darkest part; 51% of homes in Chiswick were built before 1919. Permitted development caps a single storey rear extension at four metres in height. Hounslow's guidelines also say schemes using the flat roof of a single storey rear extension as a balcony or roof terrace will normally be refused, so plan the roof as a roof.

We run the kitchen fit-out in the same programme as the shell. The first fix for sockets, lighting and extraction goes in before plastering, the waste positions for the sink and dishwasher are set when the floor slab is formed, and any underfloor heating goes down before the screed. A registered electrician certifies the electrics. With one team holding the sequence, the cabinet fitter arrives to a dry, square room with services where the drawings put them, and snagging covers the building and the kitchen together.

• Flat roofs with rooflights or a roof lantern over the kitchen
• Utility rooms and larders at the back of the extension
• Sliding, bifold and steel-framed glazed doors to the garden

VOA Council Tax stock of properties, March 2025, for Chiswick North East, Chiswick South East, Chiswick South West and Chiswick Park. Counts rounded by the VOA.

When comparing kitchen extensions in Chiswick with other work, it helps to read kitchen renovation in Chiswick, kitchen extensions across Hounslow, a side return kitchen infill, the Party Wall Act on a boundary build, our London kitchen extensions page and Renovating a Victorian Terrace.

Why Choose GS Renovation in Chiswick

You deal with one firm from the drainage survey to the last cabinet door. We price from the approved drawings, appoint the structural engineer, book the Hounslow inspections, and run the shell, glazing and kitchen fit-out in one sequence so no trade waits on another. Our director, Abdelaaziz Saaid, brings more than three decades on the tools to the way the job is set out. On a Chiswick terrace with a neighbour on each side, that continuity keeps the programme tight and the dust contained.

• Cooker extract taken outside through the new roof or flank wall, not recirculated
• Registered in England, Companies House no. 14611254
• New floor level matched to the existing house, with no step at the opening

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.