House Extensions Wanstead
Single storey rear and double storey extensions in Wanstead, planning, structure and build under one contract.
- Rated 4.9 from 31 reviews on MyBuilder
- Single-storey rear extension from £40,000
- Free site survey, itemised quote
GS Renovation plans and builds extensions across Wanstead, from single-storey rear additions to double-storey and wrap-around projects on the Victorian and Edwardian terraces near Wanstead Park. We handle the groundworks, steel beams, roof and full fit-out as one accountable project.
In Wanstead, 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 Wanstead: the structural engineer we appoint designs the structure, we build it, and building control signs it off.
Price guide
| Work | Indicative London range |
|---|---|
| Single-storey rear extension | from £40,000 |
| Rear extension, per m² | £2,000 to £2,800 |
| Side return, per m² | £2,400 to £3,200 |
| Wraparound, per m² | £2,400 to £3,200 |
| Double storey, per m² | £1,800 to £2,600 |
| Basement extension | see the basement page |
Indicative London ranges (Architecture for London, Resi, MyBuilder and Checkatrade, 2026), not a quotation. Prices checked September 2026. Full breakdown: Extension Costs & Planning.
Quick estimate for Wanstead
Wanstead range: choose above
Side-return and rear extensions in Wanstead
The most popular Wanstead extension fills in the side return beside the rear closet wing, widening a narrow galley kitchen into a bright open-plan space that runs the full width of the house. These terraces were built with generous rear gardens backing towards the park and forest, which usually leaves room for a rear extension as well, giving you a large kitchen-diner opening onto the garden. We dig the foundations, form the steel structure and build the roof to suit the original brickwork.
Because the new opening removes load-bearing walls, a structural engineer sizes the steel beams and building control inspects the work at each stage. Where the extension meets the shared boundary, the Party Wall Act applies and you serve notice on your neighbour in good time. We finish the whole thing, from the screed and underfloor heating to the glazing, plastering and decoration, so you deal with one team from foundations to handover.
Housing in Wanstead
Around 4,680 homes make up Wanstead on the valuation list; 31% are flats and 69% houses, and 43% date from before 1919, 20% from between the wars and 36% from after 1945. A rear extension on a terrace in Wanstead digs foundations close to both neighbours, so notices to both are normal, and 36% of homes here are terraced.
What Wanstead Grove's rules mean for side and two storey extensions
Wanstead Grove Conservation Area was designated in 2009 and its boundary has remained the same since. Its appraisal and management plan is direct: side extensions in conservation areas need planning permission, and so do all two storey rear extensions. That rules out two routes which are permitted development on many houses elsewhere. A single storey rear extension within the usual limits can still be permitted development in a conservation area unless a direction removing that right covers the address, so check for one first. Redbridge's Local Plan then supports householder extensions that are subordinate to the existing building in size, scale or height. On a Wanstead house, a side addition set back from the front and kept lower than the main roof is the version with the stronger case.
The quicker planning options narrow in a conservation area as well. Redbridge's planning fast track is not available for sites in a conservation area and must relate to a single dwellinghouse, so a Wanstead flat or a conservation area address goes through the ordinary process. Get advice before drawings are commissioned: the standard duty planner service is a 20 minute phone appointment, but it is closed to conservation area addresses, which use the advanced service instead. Trees are the other early check. Every tree in a Redbridge conservation area with a trunk over 75mm in diameter is automatically protected, so one near the footprint is dealt with before the foundation design is fixed.
Planning and permitted development in Redbridge
Many single-storey rear and side-return extensions in Wanstead fall under permitted development, meaning they do not need a full planning application to Redbridge Council, though the exact limits depend on your property, its plot and whether earlier extensions have used up your allowance. Double-storey work, anything close to a boundary or work on a house affected by an article 4 direction is more likely to need permission, so we assess your specific E11 address before promising anything.
We tell you clearly at the outset whether your project is permitted development or needs planning permission, and we coordinate the drawings and any application with your architect or technician either way. Separately from planning, all the structural building work must meet building regulations and be signed off by building control. Keeping those two approvals distinct matters, and after our founder's 30+ years on the tools, we know how the council treats extensions on these period terraces.
Kitchen extensions in Wanstead
52% of the houses in Wanstead 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 Wanstead; the build figures are in the table above.
- Wrap-around extensions and infills
- Foundations, groundworks and steel frames
- Steel goalpost frames where the rear wall opens up
VOA Council Tax stock of properties, March 2025, for Wanstead and Wanstead Flats. Counts rounded by the VOA.
Why Wanstead Homeowners Choose GS Renovation
Wanstead homeowners choose GS Renovation because we manage the whole extension, from establishing whether you need planning permission or fall under permitted development, through foundations, steelwork and roofing, to the final decoration. One team, engineer-designed structure, building control sign-off handled. Our founder's 30+ years on the tools means we build to suit these terraces, not against them.
- Garden levels and access made good where the build meets outside
- Dust screens and floor protection in occupied homes
- Weathertight shell reached before the fit-out begins
Reviewed jobs near Wanstead
1 MyBuilder review from Wanstead, with each customer's own job title:
- Install new kitchen, plumb appliances & re-tile walls, Wanstead, 27 Jul 2022 (5 out of 5)
Read all 31 on our reviews page.
Built a new extension at rear of property. Laid foundations, drainage, raised floor, new roof and completed all fixtures and interior decoration…
George was very friendly and helpful from start to finish. He worked really hard to ensure our kitchen was installed to a high standard and was…
My husband and I are extremely pleased with the work. The standard of the work is outstanding and Saiid has a great eye for detail and will not leave…
FAQ
Frequently Asked Questions about House Extensions Wanstead
Is a cheap house extensions quote in Wanstead worth taking?
A cheap house extensions quote in Wanstead is only worth taking if it covers the same work, and usually it does not. A low figure normally leaves out the approvals (permitted development or a planning application to Redbridge Council) or the making good, both of which still get paid for at E11. GS Renovation itemises within £2,000 to £2,800 per m² for a rear extension (indicative) so the comparison is honest.
Will my Wanstead extension need planning permission or is it permitted development?
Many single-storey rear and side-return extensions on Wanstead terraces are permitted development and need no application to Redbridge Council, but double-storey work, boundary proximity or a previous extension can change that. We assess your specific E11 house first, tell you clearly which route applies, and coordinate the drawings and any application for you.
Can a Wanstead house near Christ Church Green add a side extension without planning?
Usually not. Wanstead's older houses around Christ Church Green lie inside a conservation area, and that designation strips away the permitted development right to build out to the side. So filling a side return there means a planning application to Redbridge Council. A modest single-storey addition at the back can sometimes still proceed without one, but building regulations approval is needed whichever way it goes.
Do trees near Wanstead Park change extension foundations?
They can. Roots draw moisture from the ground, and on shrinkable soils that causes movement, so footings near trees go deeper. The engineer checks the soil and the trees before setting the depth. Building control inspects the trench before concrete. Deeper foundations near the neighbour also bring in the three-metre party wall notice.
Will building control check the insulation in a Wanstead extension?
Yes. Part L sets insulation standards for the new walls, roof and floor, and the inspector sees it before it is covered. Large glazed doors and rooflights count against the heat loss calculation, so the balance is set in the design. Redbridge Council issues the completion certificate at the end.
Does a double-storey Wanstead extension need a party wall notice?
It very likely does. Two storeys put more weight on the ground, so footings go deeper, and trenches that come inside three metres of next door and below its own footings trigger a month's written warning under the 1996 Act. Your Wanstead neighbour may agree in writing or object; an objection brings surveyors and an award, so serve it once the foundation design is known.
Can a large Wanstead extension owe the Community Infrastructure Levy even as permitted development?
Yes. Redbridge says a Community Infrastructure Levy charge applies if you create more than 100 square metres of new floor area, even if the works are permitted development. A wraparound added to an earlier extension, or a ground floor extension built together with other new rooms, can reach that total on a larger Wanstead house. Measure the new floor area on the drawings before anything is submitted, and deal with the levy paperwork before work starts rather than after.
Which Redbridge inspection comes first on a Wanstead extension build?
Foundations or excavations, one of the inspection types on Redbridge's booking list. It happens with the trench dug and before any concrete goes in, so the inspector sees the depth and the ground at the bottom. Redbridge offers same day inspections if booked before 10am, so on a Wanstead job the concrete is ordered for the afternoon and the booking is made first thing. Later stages, such as the drainage and the ground under the new floor, are inspected as the build reaches them.
How does Redbridge set the building control charge for a Wanstead extension?
By floor area rather than by the value of the job. The current fee schedule has a band for extensions with a total floor area over 20m2 and not over 60m2, and the charge is the same whether the extension goes through full plans or a building notice. Measure the total floor area of the new rooms from the drawings and the band follows from that. The charges include VAT, so there is nothing to add on top.
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