More room, same postcode 🏡

House extensions in N11, New Southgate

House extensions in New Southgate (N11): more kitchen, more bedroom, more you. Describe the project and up to 3 local builders will get in touch to quote.

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✅ What your house extensions covers in N11 (New Southgate)

Plans and drawings, or working to yours
Building regulations and party wall help
Foundations, walls, roof and windows
Plastering, electrics and plumbing coordinated
A clear timeline and staged payments

💷 Typical house extensions prices in N11 (New Southgate)

Typical London prices in 2026. A guide only; your quotes will depend on the job.
Single-storey rear extension	£2,800 to £4,000 per m²
Double-storey extension	£2,200 to £3,500 per m²
Side return extension	£3,000 to £4,200 per m²

💬 Questions about house extensions in New Southgate

Do I need planning permission in New Southgate?

Many rear extensions fall under permitted development, so they don't need full planning permission. Rules are stricter in conservation areas and for flats. Check with the council or ask builders when they quote.

How long does an extension take?

A single-storey extension is often 3 to 5 months from first dig to final snag, plus time for plans and approvals. Your builder will give you a timeline.

What should the quote include?

A written breakdown of labour and materials, a start date, a payment schedule tied to stages of work, and who handles skips and waste.

📍 House extensions covering N11

N11 covers New Southgate in the London Borough of Barnet. Enter your full postcode above and we'll send your job to builders who work in N11 and nearby, like N2 (East Finchley), N3 (Finchley) and N12 (North Finchley).

Want more than house extensions?

All builders in N11