Kitchen in fumed timber with a round marble topped island.

House extensions in Hampstead.

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

Hampstead houses climb a hill, with gardens that matter as much as rooms. An extension here stays subservient to the house.

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Smaller than the house, by design.

DH1
The Hampstead plan keeps extensions subservient
NW3
Georgian and Victorian family houses
£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 Hampstead NW3, 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.

Hampstead’s Georgian and Victorian houses step up a steep hill, some facing the heath.

Here a lawn is valued like a room. A kitchen wing that swallows it rarely gets support.

The Hampstead plan’s Policy DH1 keeps extensions subservient. Policy DH2 protects original windows, doors and walls.

The slope matters too. A garden level room may sit below the street, and ground water is checked.

We draw the extension to read as later and smaller. Then the same team builds it.

What the council allows in Hampstead.

Council
London Borough of Camden, whose Local Plan was adopted in July 2017.
Extensions
Policy DH1. Extensions stay subservient. New dormers are modest, set back and ideally at the rear.
Original features
Policy DH2. Original windows, doors and walls are protected, or restored.
Design
Policy D1. Work must respect local character and preserve heritage.
Conservation areas
Camden has 40, over about half its area. They take in most of the village.
Listed houses
Listed building consent is needed, even where planning permission is not.

Source: Camden Local Plan 2017, Camden’s Basements guidance 2021, and the Hampstead plan 2025. Read on 5 October 2026. Policies change, so we read them again for your address.

Close by, in North London.

Dining table set beside glazing that opens onto the terrace.

North London·House

North London house, reconfigured and fitted out

A 3,500 sq ft house we reconfigured in North London N2. Not in Hampstead, but close.

See the project

Completed work, photographs

What a house extension costs in Hampstead.

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

On a slope, groundworks can weigh more in the total.

Fees, party wall costs, contingency and VAT sit outside the figure.

Open the calculatorThe 2026 cost guideCan I build it here?

How big can an extension be on a Hampstead house?

Big enough to serve the house, not to rival it.

The Hampstead plan’s Policy DH1 asks for extensions to stay subservient.

Garden space is weighed as well.

Does the Hampstead Neighbourhood Plan cover rear extensions?

Yes. Policy DH1 applies to extensions of every kind.

Policy DH3 also favours reuse, lime and timber.

Must I keep original windows when extending a Hampstead house?

Original windows are protected under Policy DH2.

Where they have been lost, restoring them is encouraged.

What does a garden extension in Hampstead cost?

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

Fees, party wall costs and VAT are extra.

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