Kitchen Extensions Belgravia

A kitchen extension in Belgravia is shaped by the building before the brief. Of the homes here, 71% are flats and 29% are houses, and 28% are terraced houses. The realistic project is a modest rear addition to a stucco-fronted townhouse or a mews house, or a reworked lower ground floor kitchen where nothing can be added. Belgravia was first designated as a conservation area in 1968, and that sets the design test for anything built at the back.

In Belgravia, 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 Belgravia: 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.

Which kitchen extension a Belgravia townhouse or mews can take

The realistic addition for a Belgravia terraced house is a part-width room at the back that stays visually secondary to the house. Westminster's conservation area guidance says full width rear extensions are generally not acceptable, except in certain circumstances at basement level, and that extensions must be architecturally subordinate to the main building. For your kitchen that means a narrower new room than a full-width scheme would give, so the plan has to work hard: where the sink, hob and table sit decides whether the space feels generous or cramped.

Where a mews house has no rear garden to build into, the kitchen gains space from inside instead. That can mean taking out a partition, turning the stair, or bringing a former garage bay into the kitchen where the lease and the planning position allow it. Replacing a garage door changes the mews elevation, so your designer confirms whether that needs consent before anything is ordered. We price and programme both routes from the same survey, so you can compare a small extension against an internal rework before your designer commits to drawings.

Housing in Belgravia

Count the homes in the Knightsbridge, Belgravia & Hyde Park statistical area and you get about 6,020: 23% built since 1945, 9% between the wars and 67% before 1919, with flats at 71% and houses at 29%. Only a ground floor flat in Belgravia with its own garden can extend its kitchen, which matters here because most homes are flats.

Kitchen extensions for Belgravia flats need planning permission

A Belgravia flat has no householder permitted development rights, so any extension to it needs planning permission. The national rules for extensions apply to houses only and not to flats or maisonettes, and with 71% of homes here being flats, that affects a large part of the market. A lower ground floor garden flat in a converted townhouse is where a small rear kitchen extension is most often physically possible. It still needs a planning application, and normally the freeholder's written consent under your lease.

Where an extension is off the table, a Belgravia flat kitchen can grow by joining it to the reception room. That is structural work: the structural engineer we appoint sizes the steel, the landlord's surveyor normally reviews the drawings under the licence to alter, and the managing agent sets the hours and access we work to. If the building is on the statutory list, taking out the wall also needs heritage consent, which the owner or designer obtains. We run the steel, the services and the new kitchen as one sequence, so the room is fitted without a second contractor cutting into new finishes.

Planning rules for a kitchen extension in Belgravia

In Belgravia you need planning permission for some extensions that would not need it outside a conservation area. Westminster says so directly, and the national rules add that all side extensions on Article 2(3) designated land need householder planning permission. A single-storey rear extension to a terraced house can go three metres beyond the original rear wall under permitted development, but a place on the statutory list, a planning condition or a local direction can take that away. Your designer checks the property's status first, and the programme should allow for a householder application until that check says otherwise.

Two more layers apply in Belgravia. The Belgravia Neighbourhood Plan was adopted on 7 March 2024 and forms part of Westminster's Development Plan alongside the City Plan, so your designer reads both. Westminster's city-wide Basement Development Article 4 Direction came into force on 31 July 2016 and removes permitted development rights for basement development. Digging down to gain kitchen height should therefore be planned as a planning application, with your designer confirming how Westminster treats the excavation. We build to whatever the approved drawings show and plan the steel order around the decision date.

Steel, drainage and roof glazing in a Belgravia kitchen extension

The build in Belgravia starts with the opening in the back wall. The structural engineer we appoint sizes the steel that carries the rear elevation over the new kitchen, and we prop the floors above before the masonry comes out. Where the steel bears on a party wall, the Party Wall Act applies, and you as building owner serve the notices before that work starts. Drainage is traced early, because a sink moved into the extension needs a fall to the existing run. Roof glazing is ordered to the engineer's dimensions so the frame and the steel meet.

Where Westminster is your building control body, it must be told the start date at least 2 days before work begins. It aims to give a decision on a full plans application within 5 weeks, though it says this may take longer. Its completion certificate is issued only once all fees are paid and the electrical and gas certificates are supplied. A registered electrician certifies the wiring and a registered gas engineer connects the hob, and we collect both certificates as the kitchen fit-out finishes, so the file closes with the job.

• Flat roofs with rooflights or a roof lantern over the kitchen
• Boiler relocation and flue changes on the enclosed rear wall
• Cooker hood extraction ducted through the roof or flank wall

VOA Council Tax stock of properties, March 2025, for the Knightsbridge, Belgravia & Hyde Park statistical area, which also covers parts of Knightsbridge. Counts rounded by the VOA.

Useful next reading for a kitchen extensions project in Belgravia: kitchen renovation in Belgravia, kitchen extensions across Westminster, a side return kitchen infill, the Party Wall Act on a boundary build, our London kitchen extensions page and Extend or Move?.

Why Belgravia Homeowners Choose GS Renovation

We quote a Belgravia kitchen extension as one job after a site visit: the opening, the steel, the drainage, the roof glazing and the kitchen itself. The founder has more than thirty years of hands-on building experience and runs the programme with the structural engineer and your designer. You get one sequence of work rather than a builder handing over a shell for a kitchen company to finish, which matters in a terrace where neighbours, access and working hours are all tight.

• Old kitchen kept in use until the new shell is weathertight
• Drains surveyed by camera before the footprint is fixed
• Structural engineer instructed and coordinated on your behalf

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.