Highgate, Greater London
Single-storey rear extension in Highgate
Ground-floor space across the back of the house, usually for a kitchen, dining or family room. If you live in Highgate 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.
Highgate is covered from our Greater London round, including N6, NW3 and NW5. A depth of 3 to 4 metres keeps many single-storey rear extensions in Highgate within permitted development, subject to the house's planning history.
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 Highgate?
A single-storey rear extension in Highgate 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 |
These are guide ranges; the written quote after the survey is the figure that counts.
Do you need planning permission for a single-storey rear extension in Highgate?
The planning route for a single-storey rear extension in Highgate 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. Before any drawing we look up the property's history with the council, because earlier extensions and removed rights change the answer.
What are homes in Highgate like to extend?
Much of Highgate is Victorian and Edwardian terraced housing with narrow back additions, which suits side returns, wraparounds and 3 metre rear extensions. Many streets are in conservation areas, gardens are short, and almost everything comes through the house or along a rear alley.
How a single-storey rear extension in Highgate 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.
Options and costs
We draw layout options and price each one, so the budget shapes the design rather than surprising you later.
Paperwork handled
Planning, prior approval or permitted development, Building Regulations approval, structural design and party wall notices are all handled by us.
Written price, then build
Once the design and approvals are in place, you get a fixed written price and programme, and we build through to sign-off.
Single-storey rear extensions near Highgate
Close by, we work in Archway, about 1.1 miles away, and Belsize Park, about 1.4 miles away.
- Single-storey rear extension in Archway
- Single-storey rear extension in Belsize Park
- Single-storey rear extension in Chalk Farm
- Single-storey rear extension in Kilburn
- Single-storey rear extension in Holloway
Other work in Highgate:
FAQ
Single-storey rear extension questions in Highgate
Who will build my extension?
Vetted building teams working under contract to us. Your contract is with S&K Property Investments and Improvement Ltd for the design and the build.
Do you handle building control in Highgate?
Yes. We apply to the council or a registered building control approver and hand over the completion certificate.
How deep can a single-storey rear extension be without planning?
In England, 3 metres on an attached house and 4 metres on a detached house under permitted development, or up to 6 and 8 metres with prior approval. Wales allows 4 metres; Scotland and Northern Ireland have their own limits.
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.
What postcode areas do you cover around Highgate?
Including N6, NW3 and NW5, and the surrounding Greater London area.
Can you match the brick or stone on my Highgate house?
We source the closest match and show you samples before ordering; reclaimed materials are often the best match on older houses.