Dining table set beside glazing that opens onto the terrace.

House extensions in North London.

North London · N2 · North London house, reconfigured and fitted outCase study

Kitchen extensions and garden rooms for North London houses. Drawn to sit quietly behind the original, then built by our team.

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Adding space behind a North London house.

Policy DH1
Extensions stay subservient to the house
3 metres
Terrace rear reach under permitted development
7 days
A budget estimate, typically

NU Projects is a design and build company in Fulham SW6, founded in 2010. We handle house and kitchen extensions in North London NW and N. 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.

Most North London extensions open a kitchen onto the garden. Gardens here are often long, and many slope away from the house. The fall changes the footings and the steps down.

Camden asks extensions to stay subservient to the original. Height, depth and materials are all weighed. Much of the area is conservation area, where the larger permitted route is closed.

We draw the extension with the structure already worked out. Steels, drainage and party wall notices are planned before planning goes in. That keeps the build price close to the estimate.

In St John’s Wood the council is Westminster. We check each address first.

What Camden asks of a North London extension.

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.
St John’s Wood
It sits in Westminster, not Camden. We confirm the council first.

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.

What a house extension costs in North London.

£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.

On a sloping North London garden, groundworks can weigh more in the total.

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

Open the calculatorThe 2026 cost guideCan I build it here?

How far can a North London rear extension go without planning?

On a terrace, a single storey may reach 3 metres.

In a conservation area, the larger prior approval route does not apply.

Does a sloping garden make an extension cost more?

Often, yes.

Deeper footings and retaining walls add to the groundworks.

Will Camden accept a glass box on a period house?

It depends on the house and the street.

Camden asks that extensions stay subservient and respect local character.

Do I need party wall notices for an extension?

Usually, if you dig near or build on a shared boundary.

We serve them early so they do not hold up the start.

Tell us about your home in North London.

Your name and one way to reply are enough. It goes straight to the studio.

A phone number or an email is enough. We only need one.

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What is the work?