Greater London

Kitchen-diner rear extensions in Greater London

An open-plan kitchen, dining and family room that opens straight onto the garden. 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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Open-plan kitchen-diner in a rear extension with navy units, an oak-topped island and a vaulted ceiling with roof windows

We usually keep the working kitchen where the old one was and put the dining table in the new space by the doors, which suits most Islington homes. 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 kitchen-diner rear extension cost in Greater London?

In Greater London, our guide for a kitchen-diner rear extension is £2,470–£4,030 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.

Kitchen-diner 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?

In England a single-storey rear extension can often be built under permitted development: up to 3 metres beyond the original rear wall of an attached house, or 4 metres on a detached house, no higher than 4 metres, with eaves no higher than 3 metres if any part 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.

Where in Greater London do we work?

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FAQ

Questions people ask

Should the sink face the garden?

If the plan allows, an island sink or hob facing the glass is a common choice. It needs a floor-level drain run, which is easy to lay in a new slab.

Can I have underfloor heating?

Yes. Wet underfloor heating in the new screed is the usual choice, often with the old room's radiators kept or replaced.

Where does the cooker extraction go?

Through the new wall or roof, ducted to outside. Recirculating hoods are possible but less effective.

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.