Greater London

Larger home extension prior approval (England) in Greater London

Up to 6 m (attached) or 8 m (detached) deep, after neighbour consultation. Across Greater London we handle the whole rear extension: survey, drawings, the planning route, building control and the build. Towns we cover here include Islington, Bexley and Barking.

Get a guide price Call 0800 088 6341

Deep single-storey rear extension with two roof lanterns running along the garden of a detached house

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.

How much does a prior approval rear extension cost in Greater London?

For Greater London we work from the London rate: £2,470–£4,030 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.

Prior approval rear extension guide prices in Greater London
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 in Greater London?

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.

Where in Greater London do we work?

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FAQ

Questions people ask

How deep can I go with prior approval?

6 metres on attached houses and 8 metres on detached houses, single-storey only, up to 4 metres high.

Can my neighbours stop it?

They can object; the council then judges the effect on their amenity. Many schemes are approved after objections.

What happens after 42 days?

If the council has not decided, you can proceed. We still recommend waiting for written confirmation where possible.

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.