Greater London

Rear extension plans and planning applications in Greater London

Measured survey, design options, planning drawings and the application, handled for you. We design and build rear extensions across Greater London, from Islington and Bexley to Barking, covering single-storey kitchen extensions, two-storey additions, side returns and wraparounds.

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Printed floor plan and elevation drawings of a rear extension with a scale rule, tape measure and pencil

Planning applications in Islington go to the local planning authority, and we check its local design guidance for rear extensions before drawing. Greater London is mostly 1930s semis, short terraces and post-war houses, so full-width single-storey and two-storey rear extensions are realistic on many plots. Some later estates had permitted development rights removed by condition, so we check the planning history first.

What does it cost in Greater London?

As a guide, £1,000–£2,500 including VAT. These are guide ranges; the written quote after the survey is the figure that counts.

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.

A householder planning application in England costs £548 (£575 for applications made from 8 December 2026), and a lawful development certificate for proposed work costs half the householder fee.

Councils aim to decide householder applications within 8 weeks of validation, and prior approval within 42 days.

Where in Greater London do we work?

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FAQ

Questions people ask

Do I need an architect?

You need accurate drawings by someone who knows householder planning; we provide them.

Can I see the design in 3D?

Yes; we produce simple 3D views so you can judge the size and light.

What if planning is refused?

We review the reasons with you, amend and resubmit (often free of a second fee within 12 months in England) or appeal.

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.