East Barnet, Greater London
Two-storey rear extension in East Barnet
A larger kitchen downstairs and an extra bedroom or bathroom upstairs, under one roof. If you live in East Barnet and want to know what a two-storey rear extension would cost and whether it needs planning, start with the online guide price or a free site visit.
East Barnet sits in Greater London, with postcode districts including EN4, EN5 and N20. Two-storey rear extensions suit semi-detached houses in East Barnet best, where the extra bedroom matters as much as the bigger kitchen.
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 two-storey rear extension cost in East Barnet?
In East Barnet, our guide for a two-storey rear extension is £2,340–£3,510 per square metre including VAT for a standard specification. 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 × 5 m footprint, two floors (30 m²) | £70,000–£105,500 |
| 4 m × 6 m footprint, two floors (48 m²) | £112,500–£168,500 |
These are guide ranges; the written quote after the survey is the figure that counts.
Do you need planning permission for a two-storey rear extension in East Barnet?
Planning for a two-storey rear extension in East Barnet follows the English householder rules.
A two-storey rear extension can be permitted development in England only if it projects no more than 3 metres, stays at least 7 metres from the rear boundary, matches the existing roof pitch and has obscure-glazed upper side windows. In practice most double-storey rear extensions go through a householder planning application.
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 East Barnet like to extend?
Much of East Barnet is 1920s and 1930s semis and short terraces with longer gardens than inner London, which suit full-width single-storey rear extensions. Parking suspensions, skip licences and controlled hours on residential streets shape the programme more than the build itself.
How a two-storey rear extension in East Barnet 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.
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.
Two-storey rear extensions near East Barnet
Close by, we work in Cockfosters, about 0.6 miles away, and New Barnet, about 0.6 miles away.
- Two-storey rear extension in Cockfosters
- Two-storey rear extension in New Barnet
- Two-storey rear extension in Hadley Wood
- Two-storey rear extension in Barnet
- Two-storey rear extension in Totteridge
Other work in East Barnet:
FAQ
Two-storey rear extension questions in East Barnet
Do I need planning permission for a rear extension in East Barnet?
Often not for a single-storey rear extension of up to 3 metres (4 metres on a detached house) under permitted development, or up to 6 or 8 metres with prior approval, unless the house is in a conservation area or its rights have been removed.
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.
Can it be built on a terraced house?
Sometimes, but the upper floor is harder to get through planning on a terrace because of the effect on neighbours. A single-storey extension with a loft conversion is often an easier route.
Do you handle building control in East Barnet?
Yes. We apply to the council or a registered building control approver and hand over the completion certificate.
Is the site visit in East Barnet free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.
How long does a rear extension take to build in East Barnet?
Most single-storey rear extensions take 10 to 16 weeks on site and two-storey extensions 16 to 26 weeks, after design and approvals.