Greater London

Knocking through to a rear extension in Greater London

Steel beams, padstones and props to open the back of the house safely. 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.

Get a guide price Call 0800 088 6341

Back wall of a house removed during an extension build with a red steel beam on padstones and temporary props

Older houses in Greater London often have solid brick back walls carrying a lot of weight, so the steel design comes early. 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.

What does it cost in Greater London?

As a guide, £3,500–£9,000 including VAT. Your written price follows a measured survey and an agreed design, so it reflects your house, not an average.

What approvals does it need in Greater London?

Planning and Building Regulations are separate in England: even a permitted development extension is inspected for foundations, drainage, structure, insulation, fire safety and ventilation, through the council or a registered building control approver, ending with a completion certificate.

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?

Book a free site visit

Tell us about the house and we'll call to arrange a free, no-obligation visit.

Postcode

What are you planning?

Your name

Phone

I’ve read the privacy notice. S&K Group Holdings Ltd will use my details to reply to this enquiry, and the building team for my area may receive them to arrange the visit.

FAQ

Questions people ask

Can the whole back wall come out?

Often, with a beam across the full width or a goalpost frame. Some walls need a short pier left at the ends.

Do I need building control for a beam?

Yes. The calculations and the installed steel are checked.

How long does it take?

The wall itself usually comes out in a day or two, timed for when the extension is weathertight.

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.