House Extensions Southall

GS Renovation builds extensions across Southall, where interwar and Edwardian terraces and 1930s semis make kitchen and side-return extensions the usual projects. We handle foundations, steel, roofing and full fit-out, and we guide you through Ealing Council planning from the very first drawing.

In Southall, a single-storey rear extension typically starts from £40,000, or £2,000 to £2,800 per m² (indicative London ranges, Architecture for London, Resi, MyBuilder and Checkatrade, 2026). GS Renovation Ltd, a building contractor based in Potters Bar, does the work in Southall: the structural engineer we appoint designs the structure, we build it, and building control signs it off.

Rear and side return extensions in Southall

Southall's terraces and semis lend themselves to single storey rear kitchen extensions, side-return infills down the flank of a terrace, and wrap-around schemes that combine the two, with double storey additions where the plot allows. We start with proper groundworks, digging and pouring foundations to suit the ground and the neighbouring structures, then build up in blockwork and brick to match the existing house. Steel beams tie the new opening back to the existing house so the ground floor flows as one space.

Because these houses are attached, a rear or side extension often runs alongside a shared party wall, so a party wall notice is usually part of the job. You serve the party wall notice as building owner (or your surveyor does); we give you the drawings and programme it needs and build to any award. We manage the roof works, the glazing, the insulation and the internal fit-out through to decoration, so you deal with one team from footings to finish. On most Southall plots you can extend meaningfully and still keep a proper outdoor space.

Housing in Southall

The valuation list shows roughly 14,510 homes in Southall, of which 30% are pre-1919, 47% interwar and 23% post-1945, split 36% flats to 64% houses. A rear extension on a terrace in Southall digs foundations close to both neighbours, so notices to both are normal, and 51% of homes here are terraced.

Sizing and sequencing a Southall rear extension under Ealing guidance

Ealing's SPD 4 Residential Extensions says that in most cases a single-storey rear extension with a maximum depth of 3 metres and height of 3 metres will be acceptable. For a Southall terrace that is a useful starting size whenever permission is needed, because a scheme drawn inside it is less likely to be argued down. Going deeper is possible, but the application then has to justify the extra depth against the neighbours' light and outlook, so expect drawings that show both adjoining windows. Fix the depth before the kitchen layout, because the kitchen plan tends to push the size up rather than the other way round.

The build follows Ealing's typical inspection plan for a single-storey extension: commencement, then excavations, then the DPC, the floor damp-proof membrane and the floor insulation. Since 1 February 2026 visits are available on Monday, Wednesday and Friday. An open trench waits for its excavation inspection before concrete can go in, so we dig early in the week to catch the next visit, rather than on a Friday afternoon that leaves the trench open to weekend rain. The same logic applies to the floor, where the membrane and insulation are seen before the screed covers them.

Planning and permitted development in UB1

A key early question in Southall is whether your extension falls under permitted development or needs a full planning application to Ealing Council. Many single storey rear extensions on Southall houses can proceed under permitted development rights, subject to size, height and boundary limits, but double storey and wrap-around schemes, or homes where those rights have been removed, usually need planning permission. We assess your specific UB1 property before committing to a design.

Whichever route applies, all the structural work is governed by building regulations, so foundations, steel beams, drainage and insulation are inspected and signed off by building control. We coordinate the building control paperwork, liaise with the council and keep the party wall timetable in step with the build. Getting the consents right at the start protects you later, especially when you come to sell a home in the settled residential streets around Southall and Hanwell.

Kitchen extensions in Southall

80% of the houses in Southall are terraced. On a terrace the kitchen extension is built out from the back, into the side return where the house has one or across the full rear width, and a steel beam takes the old back wall so the kitchen and the new room become one space. The fit-out is priced on its own page, kitchen renovation in Southall; the build figures are in the table above.

Double storey extensions in Southall

Under permitted development a two-storey rear extension can go no more than 3 metres beyond the original rear wall and must stay at least 7 metres from the rear boundary, and in a conservation area it is not permitted development at all. Many gardens are too short for the 7 metre rule, so a double storey extension in Southall often needs planning permission from Ealing Council. On the 51% of homes that are terraced, the neighbours' windows usually decide the depth. Norwood Green Conservation Area is in Norwood Green ward and was first designated in 1969 (council source). Our double storey extension page explains the build, at £1,800 to £2,600 per m² across both floors.

• Building control inspections at foundation, damp course and steel stages
• Roof works and structural alterations at roof level
• Steel goalpost frames where the rear wall opens up

VOA Council Tax stock of properties, March 2025, for all 5 statistical areas in Southall. Counts rounded by the VOA.

Two or three things usually come up alongside house extensions on a Southall job: RSJ and steel beam installation in Southall, house extensions across Ealing, wraparound extensions, party walls and extensions, house extensions anywhere in London and Party Wall Act Explained.

Why Southall Homeowners Choose GS Renovation

Southall homeowners choose GS Renovation because we build the whole extension and manage the consents. We tell you honestly whether your scheme is permitted development or needs an Ealing Council application, we build the foundations and steel, and building control signs off the structure. With our founder's 30+ years on the tools, you get one team accountable from footings to final decoration.

• Programme planned around party wall notice periods before excavation near a neighbour
• One point of contact from first survey to handover
• Building control inspected at foundation, damp course and steel stages

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.