House Extensions Forest Gate

GS Renovation builds extensions throughout Forest Gate, from single-storey rear additions to full wrap-arounds on the Victorian and Edwardian terraces around West Ham Park and towards Stratford. We take care of foundations, steelwork, roofing and the full fit-out as one continuous project.

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

Side-return extensions in Forest Gate

The classic Forest Gate extension fills the side return, the narrow alley of dead space beside the rear closet wing that these terraces were built with. Widening the kitchen into that strip turns a cramped galley into a proper open-plan kitchen-diner running the full width of the house. It usually needs a steel beam where the old external wall is removed, sized by an engineer and signed off under building regulations. That side return kitchen extension is the house extension most E7 terraces are built for, because the width it adds is exactly what a galley kitchen lacks.

We dig and pour the foundations, often deeper than expected because of tree roots and clay in the E7 gardens, then build up in matching London stock brick so the addition reads as part of the original house. Rooflights or a lantern bring daylight into the middle of the plan, which these deep terraces badly lack. Rainwater, drainage and any existing manholes are all planned in from the start.

Housing in Forest Gate

About 11,180 homes are listed for Forest Gate, and the mix is 49% houses to 51% flats, with 31% built after 1945, 1% in 1919 to 1939 and 67% earlier. Most homes here are flats, and a flat in Forest Gate has no householder permitted development rights, so extending one needs planning permission and the freeholder's consent.

Extending on the Woodgrange Estate in Forest Gate: one storey, limited depth

The Woodgrange Estate in Forest Gate has its own conservation area design guide, and it narrows the options before any drawing starts. It permits only ground floor single storey rear extensions, to avoid overshadowing, visual intrusion and overlooking of the houses next door. A full width ground floor extension to the main house may be supported subject to conditions, the first being a maximum depth of 3m. So the realistic options there are a ground floor addition within that depth, whether a side return infill where the house has one or a modest full width extension. The structural engineer we appoint designs the rear opening and the new footings to that depth from the outset, rather than trimming a deeper scheme later.

The same guide does not accept large-scale basement excavations that unacceptably affect the character and appearance of the rear garden and property, so digging down on a large scale is unlikely to get round the depth limit. The estate is also under a comprehensive Article 4 Direction served in May 1977, so ask Newham whether your extension needs a planning application rather than relying on permitted development. Across Forest Gate, E7 sits in Newham CIL Charging Zone 2, so ask Newham early whether the levy applies to your extension. Wherever the house is, Newham must be told when the extension is deemed commenced, once the foundations are constructed and the structure of the lowest floor is complete, and that date goes into the programme.

Planning and permitted development in E7

Many single-storey rear and side-return extensions in Forest Gate fall under permitted development, meaning they can proceed without a full planning application, though size limits and boundary distances apply. Larger projects, double-storey additions, or anything affecting the front elevation usually need planning permission from Newham Council. We assess your specific property honestly and tell you which route applies before you commit, rather than assuming.

Whichever route you take, the structure itself is controlled under building regulations, not planning, so the beams, foundations and insulation are inspected separately. Where your extension is built up to or along the boundary with next door, the Party Wall Act comes into play and you serve notice on your neighbour as building owner, or your surveyor does. We keep these strands together so the drawings, the council submission and the party wall timetable all move in step.

Kitchen extensions in Forest Gate

51% of homes in Forest Gate are flats, and a flat has no householder permitted development, so a ground-floor flat's kitchen extension needs planning permission from Newham Council and the freeholder's consent. Most kitchen extensions here are on the 49% of homes that are houses. The fit-out is priced on its own page, kitchen renovation in Forest Gate; the build figures are in the table above.

Double storey extensions in Forest Gate

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 Forest Gate often needs planning permission from Newham Council. On the 44% of homes that are terraced, the neighbours' windows usually decide the depth. The Woodgrange conservation area design guide permits only ground floor single storey rear extensions, to avoid overshadowing, visual intrusion and overlooking (council source). Our double storey extension page explains the build, at £1,800 to £2,600 per m² across both floors.

• Planning applications and permitted development assessments
• Bi-fold, sliding and French door openings to the garden
• Party wall process explained, and the extension built to the award

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

When comparing house extensions in Forest Gate with other work, it helps to read RSJ and steel beam installation in Forest Gate, house extensions across Newham, side return infills, garage conversions in London, house extensions across London and Bifold vs Sliding Doors.

The GS Renovation Difference in Forest Gate

Forest Gate families choose GS Renovation because we build extensions that suit E7's terraced plots, respecting the side return, the closet wing and the neighbours on both sides. One team manages groundworks, steel, roof and fit-out, and we are straight with you about permitted development versus a planning application, so there are no nasty surprises with Newham Council.

• Weathertight shell reached before the fit-out begins
• Garden levels and access made good where the build meets outside
• 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.