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Greater London

Two-storey rear extensions in Greater London

A larger kitchen downstairs and an extra bedroom or bathroom upstairs, under one roof. Rear extensions in Greater London: we cover 187 towns including Islington, Bexley and Barking, with design, approvals and the build under one contract.

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Two-storey rear extension in matching red brick with a pitched tiled roof on a semi-detached house

In Greater London we check the neighbours' rear windows first, because the upper floor is where most two-storey schemes win or lose planning. Much of Greater London 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 much does a two-storey rear extension cost in Greater London?

For Greater London we work from the London rate: £2,340–£3,510 per square metre of new floor, including VAT, standard specification. London prices sit at the top of our range because of labour rates, access through the house, parking suspensions and skip licences.

Two-storey rear extension guide prices in Greater London
SizeGuide 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

Your written price follows a measured survey and an agreed design, so it reflects your house, not an average.

Do you need planning permission in Greater London?

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.

Where in Greater London do we work?

FAQ

Questions people ask

Does a two-storey rear extension need planning permission?

Almost always. England and Northern Ireland allow 3 metres without an application only if at least 7 metres remains to the rear boundary; Wales and Scotland are similar or stricter.

Is two-storey cheaper per square metre than single-storey?

Usually yes, because the foundations and roof are shared across twice the floor area. The total cost is higher.

Can I add an en-suite upstairs?

Yes. We plan the soil pipe route early so the bathroom sits where drainage works without boxing through the room below.

Do you cover all of Greater London?

We cover 187 towns and districts in Greater London, including Islington, Bexley and Barking.

Who builds the extension?

Vetted building teams working under contract to us; your contract is with S&K Property Investments and Improvement Ltd.

Next step

See what your rear extension would cost

Get a guide price online in a couple of minutes, or book a free site visit and we'll measure up and talk you through the planning route.

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