Greater London

Roof lanterns and rooflights for rear extensions in Greater London

Lanterns, flat rooflights and walk-on glass that bring light deep into the plan. Rear extensions in Greater London: we cover 187 towns including Islington, Bexley and Barking, with design, approvals and the build under one contract.

Get a guide price Call 0800 088 6341

Large aluminium roof lantern above a kitchen island in a rear extension with blue sky above

Rear extensions in Greater London gain most from a rooflight placed against the old back wall, where the room would otherwise be darkest. 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, £2,200–£4,500 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?

New fabric must meet Approved Document L (2021 edition incorporating 2023 amendments): walls 0.18, roof 0.15 and floor 0.18 W/m²K, windows 1.4 W/m²K or Band B. Under the simple route, new windows, doors and rooflights should not exceed 25% of the extension floor area plus any openings removed; more glass is possible with a whole-house calculation.

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

Lantern or flat rooflight?

A lantern gives height and a feature; a flat rooflight is cleaner and lower-profile.

Do rooflights count towards the 25% glazing limit?

Yes, in England's simple route; more is possible with a calculation.

Can a rooflight open?

Yes, manually or electrically, with rain sensors.

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.