Seven Sisters, Greater London
Single-storey rear extension in Seven Sisters
Ground-floor space across the back of the house, usually for a kitchen, dining or family room. If you live in Seven Sisters and want to know what a single-storey rear extension would cost and whether it needs planning, start with the online guide price or a free site visit.
Seven Sisters is covered from our Greater London round, including N4, N15 and N16. On period terraces and mansion flats like those around Seven Sisters, a single-storey rear extension is usually the simplest way to fix a small back kitchen without touching the bedrooms.
Book a free site visit
Tell us about the house and we'll call to arrange a free, no-obligation visit.
How much does a single-storey rear extension cost in Seven Sisters?
A single-storey rear extension in Seven Sisters is priced at £2,470–£4,030 per square metre including VAT as a guide, before kitchen fit-out and fees. London prices sit at the top of our range because of labour rates, access through the house, parking suspensions and skip licences.
| Size | Guide price inc VAT |
|---|---|
| 3 m wide × 4 m deep (12 m²) | £29,500–£48,500 |
| 4 m wide × 5 m deep (20 m²) | £49,500–£80,500 |
| 4 m wide × 6 m deep (24 m²) | £59,500–£96,500 |
Your written price follows a measured survey and an agreed design, so it reflects your house, not an average.
Do you need planning permission for a single-storey rear extension in Seven Sisters?
The planning route for a single-storey rear extension in Seven Sisters is set by England's householder rules and your council.
Under England's householder permitted development rules you can usually add 3 metres at the back of an attached house, or 4 metres on a detached house, without a planning application, as long as the extension stays under 4 metres high and its eaves stay under 3 metres where it is within 2 metres of a boundary.
England also has the larger home extension route: a single-storey rear extension of up to 6 metres on an attached house or 8 metres on a detached house, after prior approval from the council. The council notifies your neighbours and has 42 days to decide; the fee is £249 (£310 for applications made from 8 December 2026). The route is not available on designated land such as conservation areas.
Conservation areas, National Parks, National Landscapes and the Broads restrict permitted development, and listed buildings always need listed building consent. We check your house's planning history and any conservation area before drawing, so the route is clear before you spend on plans.
What are homes in Seven Sisters like to extend?
Period terraces in Seven Sisters sit alongside flats, and the difference matters: houses usually keep permitted development rights, while flats and maisonettes need planning permission for any rear extension.
How a single-storey rear extension in Seven Sisters comes together
Free site visit
We measure the house and garden, look at the back wall, drainage and boundaries, and talk through what you want from the space.
Design and guide price
Two or three layout options with a guide price for each, so you choose the design knowing what it costs.
Approvals
Permitted development check, prior approval or planning application, then Building Regulations drawings and structural calculations, plus party wall notices where they apply.
Fixed price and build
A written price for the agreed design, a start date and a named contact through the build, ending with the building control completion certificate.
Single-storey rear extensions near Seven Sisters
From Seven Sisters, the nearest places we also cover are St Ann's (0.6 miles) and Stamford Hill (0.7 miles).
- Single-storey rear extension in St Ann's
- Single-storey rear extension in Stamford Hill
- Single-storey rear extension in Harringay
- Single-storey rear extension in Stroud Green
- Single-storey rear extension in Tottenham Hale
Other work in Seven Sisters:
FAQ
Single-storey rear extension questions in Seven Sisters
Do I need a party wall agreement?
In England, usually yes if the extension is on or near a shared boundary or the foundations are close to a neighbour's building. We serve the notices.
Can I live at home while the extension is built?
Usually yes. Most of the work is outside until the back wall is opened near the end, and that stage is screened off.
Do I need a structural engineer?
Yes for the beam over the new opening and usually for the foundations. Their calculations go to building control with the drawings.
Is the site visit in Seven Sisters free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.
Do you handle building control in Seven Sisters?
Yes. We apply to the council or a registered building control approver and hand over the completion certificate.
How long does a rear extension take to build in Seven Sisters?
Most single-storey rear extensions take 10 to 16 weeks on site and two-storey extensions 16 to 26 weeks, after design and approvals.