Kitchen Extensions Bromley

A kitchen extension in Bromley is most often planned on a house: 23% of the borough's homes are terraced and 38% are semi-detached or detached, and its housing runs to post-war suburban houses and interwar semis. That shapes the plan. A semi often has a side passage and a long garden to work with, a terrace often has a narrow return, and a flat has no householder permitted development rights at all. We build the shell, set the steel, run the drainage and fit the kitchen in one programme.

In Bromley, 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 Bromley: 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.

What a Bromley semi or terrace can take at the back

Under national permitted development rules a single-storey rear extension can go four metres beyond the original rear wall of a detached house and three metres on any other house, and it cannot exceed four metres in height. In Bromley that means a semi or terrace starts at three metres. Subject to prior approval, and outside designated land such as a conservation area, the limit rises to six metres for a semi or terrace and eight for a detached house.

The word original matters on a Bromley semi. Some already carry an earlier lean-to or a converted outhouse, and that earlier addition counts against the depth, measured from the wall as first built. Before any design goes further, your designer should measure back to that first rear wall. If the kitchen you want needs more depth than the rules allow, the route is a householder application, and we price and programme the build around whatever consent is granted.

Housing in Bromley

About 143,450 homes are listed for Bromley, and the mix is 67% houses to 33% flats, with 53% built after 1945, 30% in 1919 to 1939 and 17% earlier. 24% of homes here are semi-detached; a semi in Bromley can take its kitchen extension across the back and round into the side passage, which leaves room for a utility behind the kitchen.

Side and wraparound kitchens in Bromley's conservation areas

On a conservation area plot in Bromley every side extension needs householder planning permission, because permitted development does not cover side extensions on Article 2(3) designated land. Bromley Council states there are 47 conservation areas in the borough, and a wraparound kitchen that fills the side passage of a semi in one of them needs an application. Check the designation for your street before the drawings go past a sketch, because it decides the route and the timetable.

Where an appraisal exists, read it before the layout is fixed. The Chislehurst Road Conservation Area Appraisal says the rear elevation will be the preferred location for extensions, though alterations elsewhere are not ruled out. For a kitchen in that conservation area, that points to keeping the bulk at the back and treating any side infill as a quiet, set back link. Bromley Council also says it is unable to advise informally whether proposals fall within permitted development, so a lawful development certificate is the written answer if you want one.

Adding a bedroom over the new kitchen in Bromley

If the kitchen extension carries a room above, Bromley's Local Plan changes the shape of it. Policy 8 normally requires a proposal of two or more storeys to keep a minimum 1 metre space from the side boundary for its full height and length. On a Bromley semi with a narrow side passage, that 1 metre gap can decide whether a two-storey side addition fits at all. The policy is written for proposals of two or more storeys, so a single-storey kitchen is not caught by this test.

The roof matters too. Bromley's Local Plan says flat-roofed side extensions of two or more storeys to dwellings of traditional roof design will normally be resisted, and interwar semis have traditional hipped or gabled roofs. A two-storey side addition on one of them is therefore best drawn with a pitched roof that ties into the main house. For you that means more scaffolding, roof carpentry and tiling to match, and a longer programme than a single-storey kitchen with roof lights.

Foundations, drains and the steel into a Bromley house

The new footings are often the first thing that touches the neighbour in Bromley. The council's party wall guidance treats excavating within 3 metres of an adjoining owner's building, deeper than the neighbour's foundations, as work near adjoining buildings. On a semi or terrace the kitchen footings can easily be that close, so the building owner serves notice and the programme allows for the reply before we dig. The depth itself is set by the ground and any trees nearby.

Once the trenches are open, the drainage is set out. Existing gullies and inspection chambers often sit exactly where the new kitchen floor goes, so they are diverted or rebuilt with access kept. The opening into the back of the house is formed on a steel beam sized by the structural engineer we appoint, propped while the brickwork comes out. The kitchen fitter then works to a finished floor and walls that were set out for the units from the start.

• Drain diversions and build over agreements with the water company
• Sliding, bifold and steel-framed glazed doors to the garden
• New kitchen circuits, with Part P certification from a registered electrician

VOA Council Tax stock of properties, March 2025, for all 39 statistical areas in Bromley. Counts rounded by the VOA.

Once the kitchen extensions work in Bromley is scoped, people usually go on to read kitchen renovation in Bromley, our Bromley area guide, fitting the kitchen itself, the Party Wall Act on a boundary build, how we handle kitchen extensions across London and Getting Daylight Into a Deep Plan.

Why Choose GS Renovation in Bromley

You get one team for the whole sequence: groundworks, drainage, steel, roof, glazing, plastering, and the kitchen installed at the end without a hand-over gap between builder and fitter. The founder reads the drawings against the house before the price is fixed, so what can be seen of the old fabric is priced in from the start. We build to the consent your designer secures, supply the programme and the building control stage dates, and appoint the structural engineer for the steel. A registered electrician certifies the new circuits and any gas hob is connected by a registered gas engineer.

• Free follow-up visit after completion if anything needs attention
• Building control and Part P certificates handed over together at the end
• Old kitchen kept in use until the new shell is weathertight

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.