
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.
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.
Reconfigured by NU in North London.

North London·House
North London house, reconfigured and fitted out
A dining room opening onto a terrace, in our North London N2 house.
See the projectCase study
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.
What North London owners ask about extensions.
In North London
- Every service in Hampstead and St John’s Wood
- Loft conversion in North London
- Party wall surveying in North London
- Planning consultants in North London
- Architectural design in North London
Extensions nearby
- House extensions across London
- House extensions in Fulham
- House extensions in Chelsea
- House extensions in Kensington
- House extensions in Clapham
- House extensions in Notting Hill
- House extensions in South Kensington
- House extensions in Knightsbridge
- House extensions in Belgravia
- House extensions in Mayfair
- House extensions in Holland Park
- House extensions in Marylebone
- House extensions in St John’s Wood
- House extensions in Hampstead
- House extensions in Highgate
- House extensions in Primrose Hill
- House extensions in Earl’s Court
- House extensions in Pimlico
- House extensions in Westminster
- House extensions in Weybridge
- House extensions in Cobham
- House extensions in Oxshott
- House extensions in West London
- House extensions in South West London
- House extensions in South London
- Hampstead and St John’s Wood
- Islington, Highgate and Primrose Hill
- Camden
- Marylebone, Bayswater and Maida Vale
Further reading, from the blog
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.
See it builtNear North London
See it built.
Finished homes, designed, priced and built by NU.

Chelsea · SW3 Townhouse
Chelsea basement and extension
A new basement, a kitchen extension and a full interior renovation.
Case study

Fulham · SW6 House
Fulham Victorian house
A Victorian Fulham house, opened up, with a glazed kitchen extension.
Case study

Marylebone · W1 Apartment
Marylebone listed apartment
A modern marble kitchen, set inside Georgian rooms.
Case study
Tell us about your home in North London.
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- Already have an architect or designer? We build to their design. Working with your designer
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