House Extensions Chadwell Heath

GS Renovation builds house extensions throughout Chadwell Heath, where the interwar terraces and semis have rear gardens with room to grow. We take your extension from foundations and steel to a fully finished, watertight space.

In Chadwell Heath, 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 Chadwell Heath: the structural engineer we appoint designs the structure, we build it, and building control signs it off.

Rear and side extensions in Chadwell Heath

The gardens behind Chadwell Heath's interwar terraces and semis give most houses room at the rear that many inner London homes do not have, and end-of-terrace and semi-detached houses often have space at the side too. The most common home extension here is a single storey rear extension that opens the back of the house into a large kitchen-diner. On a mid-terrace house it sits between two neighbours, so both party walls come into it; on a semi, a side extension can use the gap alongside the house. We start with proper foundations and groundworks, checking for drains and the ground conditions common across the Becontree Estate area.

A double storey extension adds a bedroom or en-suite above the new ground floor room, keeping the roofline in proportion with the original 1930s house. Wide openings between old and new usually need a steel beam sized by the structural engineer we appoint. Where the extension runs up to the boundary with your neighbour, the Party Wall Act applies: you serve the notices as building owner, using the drawings and programme we give you, and we build to any award.

Housing in Chadwell Heath

Of the 9,660 homes the valuation list records in Chadwell Heath, 9% were built before 1919, 42% between the wars and 48% since 1945; 34% are flats and 66% are houses. Terraced houses make up 46% of homes here, and a rear extension on a terrace in Chadwell Heath digs foundations close to both neighbours, so notices to both are normal.

Sizing a Chadwell Heath rear extension to the borough's own guidance

Where the house falls within Barking and Dagenham rather than Redbridge, the borough's Residential Extensions and Alterations SPD sets two measures that shape a single storey rear extension in Chadwell Heath before any drawing is started. On a terraced or semi-detached house the depth should not normally exceed 3.65 metres from the original rear wall, and an extension should not normally cover more than 50% of your garden space. Measure from the original rear wall, not from an earlier kitchen addition, because a previous owner's extension has already used part of that depth. These figures guide planning applications, so they matter most for schemes that fall outside permitted development.

Size matters for building control too. The fee schedule issued by Be First Building Control has a band for an extension with a floor area not exceeding 40 square metres. Check which band a Chadwell Heath design lands in before it grows by a metre at the drawing stage. And if the design is testing the SPD guidance, a pre-application request is worth weighing up: in Barking and Dagenham it has to be made formally in writing with a fee. An officer's early view on depth is cheaper than a refusal and a redesign, and it tells the engineer which footprint to size the foundations for.

Planning and permitted development in Chadwell Heath

Not every extension in Chadwell Heath needs planning permission. Many single storey rear extensions on interwar houses fall under permitted development, provided they stay within the size, height and boundary limits set nationally. Larger builds, most double storey work, anything forward of the front wall and side extensions beyond the permitted limits need a full planning application to Barking and Dagenham Council, or Redbridge Council for addresses on the Redbridge side of RM6. We advise honestly on which route your specific plot and design require.

Planning permission and building regulations are two separate approvals, and every extension needs building control regardless of the planning route. Building control inspects the foundations, the steel, the insulation and the drainage as the work proceeds. We arrange the drawings and the applications, handle the inspections, then complete the full fit-out, including plastering, electrics, heating, flooring and decoration, so you receive a finished room rather than a shell.

Kitchen extensions in Chadwell Heath

70% of the houses in Chadwell Heath 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 Chadwell Heath; the build figures are in the table above.

Side return extensions in Chadwell Heath

Side returns belong to Victorian and Edwardian terraces, and only 9% of homes in Chadwell Heath predate 1919, so they are the exception here; most extensions run across the full rear width instead. Our side return extension page covers the build in detail, with build rates of £2,400 to £3,200 per m².

Double storey extensions in Chadwell Heath

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 Chadwell Heath often needs planning permission from Barking and Dagenham Council or Redbridge Council. On the 46% of homes that are terraced, the neighbours' windows usually decide the depth. The Chadwell Heath Anti-aircraft Gun Site Conservation Area became a conservation area in September 1990 (council source). Our double storey extension page explains the build, at £1,800 to £2,600 per m² across both floors.

• Levels, drainage and landscaping made good around the new build
• Insulation, airtightness and thermal detailing to regulations
• Steel goalpost frames where the rear wall opens up

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

Useful next reading for a house extensions project in Chadwell Heath: RSJ and steel beam installation in Chadwell Heath, house extensions across Barking and Dagenham, side return infills, the Party Wall Act process for extensions, our London house extensions page and Side Return vs Rear Extension.

Why Chadwell Heath Homeowners Choose GS Renovation

Chadwell Heath homeowners choose GS Renovation because we manage the whole extension under one roof, from the first drawing to the last coat of paint. We know how interwar houses in RM6 are built, how their gardens and boundaries work and how Barking and Dagenham and Redbridge councils handle applications. Our founder's 30+ years of experience means fewer surprises and a build that lasts.

• Clean, tidy and reliable tradespeople
• Foundation depth set after trial holes, drains and trees are checked
• Insulation and thermal detailing to current regulations

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.