Kitchen Extensions Balham

Houses in Balham are mainly terraced. The VOA count puts 37% of homes here as terraced houses and only 8% as semi-detached or detached, so a kitchen extension here generally means a side return infill or a single-storey rear room off a Victorian back addition. We take the job from the footings and the steel through the glazing to the fitted kitchen, so one team carries the programme from the first dig to the last worktop.

In Balham, 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 Balham: 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.

The kitchen extension a Balham terrace can take

A side return infill or a modest rear room is what a Balham terrace takes, and permitted development sets the outer limit before any drawing is argued. Nationally a single-storey rear extension on a house that is not detached may go three metres beyond the original rear wall, and no higher than four metres. Outside designated land, the prior approval route lifts that depth to six metres for any other house.

Those numbers decide the paperwork before they decide the room. A single-storey side return that fills the gap beside the back addition, and stays within the national side extension limits, can go ahead without a householder application, as long as the house is not on designated land. A deeper L shaped room, or one that wraps the back addition, is a planning application. Get that answer from your designer early, because it sets the start date we plan the dig and the steel around.

Housing in Balham

Balham counts roughly 7,240 homes for Council Tax; 68% are older than 1919, 8% interwar and 24% post-war, with 55% flats and 45% houses. Where most homes are flats, only a ground floor flat in Balham with its own garden can extend its kitchen.

Balham conservation areas change the route to a side return

If your house is in a conservation area, a side return in Balham needs householder planning permission. National rules say every side extension on Article 2(3) designated land, which includes a conservation area, requires a householder application. Wandsworth's own conservation area FAQ lists front and side extensions of one storey or more, and two storey rear extensions, among works that need permission. So a Balham side return on one of these streets goes through a full planning decision, and the programme we give you starts from the decision date rather than a hoped for one.

The council names two conservation areas as Balham in its appraisals. The Old Devonshire Road Conservation Area covers the first part of Balham built up away from Balham High Road in the early 19th century, and the council's appraisal places the Nightingale Lane Conservation Area within Balham, SW12. They are not the only ones nearby, so check the council map for your street before the brief is fixed, since it changes the drawings, the timetable and the materials.

Why a Balham flat cannot use permitted development

A ground floor flat in Balham has no permitted development route to a kitchen extension. The householder rules for extensions apply to houses only and not to flats and maisonettes, and Wandsworth's conservation area FAQ adds that permitted development rights do not apply to flats or houses converted to flats. With 55% of Balham homes counted as flats, this matters for every garden flat in a converted terrace. The same applies to a rear room built across a shared garden, however modest it looks on paper.

So a lower flat owner needs two consents before we can start. One is planning permission for any external change. The other is normally the freeholder's written licence under the lease, because the garden, the rear wall and the foundations are often retained by the freeholder. The upstairs owner will also want to know how the steel sits under their floor, so we give the freeholder's surveyor the drawings and a programme early.

Opening the back of a Balham house into the new room

The width of the new opening is a cost driver with Wandsworth Building Control as well as on site. Wandsworth's extension charge includes forming an opening into the extension up to 1.5m wide, and an extra charge may apply for structural openings wider than that. A Balham side return that opens the whole back of the house needs a far wider opening than that, so budget for it from the start. Ask your designer to show the full span on the building regulations drawings that go in.

The structural engineer we appoint sizes the beam and the padstones; we prop, break out and set the steel. Where the steel bears on a party wall, the building owner serves the party wall notices first. With a Wandsworth building notice, work can start 48 hours after submission once the correct fee is paid. We book the drainage, footings and steel inspections into the programme so the kitchen fitters arrive to a dry, inspected shell.

• Soil stack and gully rerouting beneath the new floor
• Wet underfloor heating laid in the new screed
• Utility rooms and larders at the back of the extension

VOA Council Tax stock of properties, March 2025, for Balham and Nightingale Lane. Counts rounded by the VOA.

People planning kitchen extensions in Balham may also want kitchen renovation in Balham, kitchen extensions across Wandsworth, a side return kitchen infill, how building control inspects an extension, our London kitchen extensions page and Renovating a Victorian Terrace.

The GS Renovation Difference in Balham

You get one team for the dig, the steel, the roof, the glazing and the fitted kitchen, so nobody waits for a separate trade to finish before the next one starts. We work to your designer's approved drawings and the structural engineer's calculations, and give you a written programme that shows each inspection stage. The job is led by our founder, Abdelaaziz Saaid, as one point of contact, and our own trades finish the kitchen after opening the wall.

• Kitchen layout agreed before the foundations, so the services land in the right place
• Boiler flue, soil pipe and gully moved off the rear wall in the right order
• Itemised pricing, so you can see what every stage costs

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.