Living room with full height glazing onto a planted terrace.

House extensions in St John’s Wood.

North London · N2 · North London house, reconfigured and fitted outCompleted work, photograph

St John’s Wood villas sit in real gardens. A rear or side extension is a realistic brief here.

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Extend the villa, keep the villa.

Villas
Detached and semi-detached, with gardens
Policy 43
Extending sits easier than rebuilding
£160k to £250k
A rear kitchen extension, cost guide total

NU Projects is a design and build company in Fulham SW6, founded in 2010. We handle house and kitchen extensions in St John’s Wood NW8, under one contract. A rear kitchen extension typically runs £160k to £250k. A side return extension typically runs £140k to £220k. Call 020 7731 6841, and a budget estimate typically follows within seven days.

Stucco villas in St John’s Wood stand alone or in pairs, with lawns.

So a garden extension is normal here, unusually for Westminster.

Policy 43 in Westminster favours adapting over replacing. A kitchen wing added to a villa fits that well.

Knocking a villa down means a four step test, in a Pre-Redevelopment Audit.

Part of the area is conservation area. There, Policy 44 asks work to preserve or enhance its character.

What the council allows in St John’s Wood.

Council
City of Westminster, not Camden. Its City Plan was revised in January 2026.
Retrofit first
Policy 43 favours adapting a building over replacing it.
Demolition
Major demolition must pass four steps, evidenced in a Pre-Redevelopment Audit.
Heritage
Policy 44. Work must preserve or enhance the conservation area’s character.
Neighbours
Footings within 3 or 6 metres of a neighbour need one month’s notice.

Source: Westminster’s City Plan, January 2026 edition, Policies 43, 44 and 50. Read on 5 October 2026. Policies change, so we read them again for your address.

Our nearest finished work.

Kitchen in fumed timber with a round marble topped island.

North London·House

North London house, reconfigured and fitted out

A 3,500 sq ft house we reconfigured in North London N2, not in NW8.

See the project
View through an arched opening into the drawing room and its tall windows.

Marylebone·Apartment

Marylebone listed apartment

A listed apartment nearby in Marylebone, also under Westminster.

See the project

Completed work, photographs

What a house extension costs in St John’s Wood.

£160k to £250kA rear kitchen extension. A project total, from our 2026 cost guide.

£200k to £320kA wraparound extension. A project total, from our 2026 cost guide.

A detached villa can often take a wider room than a terrace.

Fees, party wall costs, contingency and VAT sit outside both.

Open the calculatorThe 2026 cost guideCan I build it here?

Is it better to extend or rebuild a St John’s Wood villa?

Westminster’s Policy 43 makes reuse the priority.

Substantial demolition must pass a four step test first.

So an extension is usually the simpler consent.

Do I need planning for a rear extension in St John’s Wood?

In the conservation area, the larger prior approval route is closed.

Outside it, a detached villa may extend 4 metres without planning.

We check which side of the line you are on.

Can I extend one half of a St John’s Wood pair of villas?

Often at garden level, if the pair still reads as one.

We draw both halves together before proposing anything.

What does a kitchen extension in St John’s Wood cost?

Our 2026 cost guide puts a rear kitchen extension at £160k to £250k.

A wraparound totals £200k to £320k.

Tell us about your home in St John’s Wood.

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