Basement contractors in South London.
Fulham · SW6 · Fulham basementsCase study
New basements and lowered cellars under South London houses. Engineered, priced and dug by one NU team.
Digging down under a South London house.
- Policy Q27
- One storey below a Lambeth house
- Most of the garden
- Stays undug behind the house
- Fulham basements
- Dug by our own team, nearby
NU Projects is a design and build company in Fulham SW6, founded in 2010. We handle basement conversion and construction in South London SW and SE. A new basement dig typically runs £500k to £900k. Converting an existing basement runs £180k to £300k. Call 020 7731 6841, and a budget estimate typically follows within seven days.
South London plots run long, so a basement rarely has to fill the garden. The dig sits mostly under the house itself.
Lambeth allows a single storey below ground. A cellar that is already there cannot gain a second level beneath it.
Every scheme starts with a screening report on soil, groundwater and neighbours. Underpinning is then sequenced bay by bay along each shared wall.
Our own crews have dug basements under Fulham terraces, just across the river. In Clapham we have fitted out a house with Cochrane Bespoke joinery.
What Lambeth allows beneath a South London home.
- Council
- London Borough of Lambeth, under its Local Plan adopted in September 2021.
- Policy Q27
- One storey below ground, and none beneath an existing basement.
- The garden
- Beyond the footprint, rear only, with 70 per cent of the garden kept.
- Assessment
- A Stage 1 Basement Impact Assessment goes in with the application. A qualified professional prepares it.
- Flooding
- A positive pumped device protects the basement from sewer flooding.
- Wandsworth side
- Near Clapham Junction, Wandsworth’s Policy LP5 applies instead. We confirm the borough first.
Source: Lambeth Local Plan 2021, Policy Q27 Basement development. Read on 7 October 2026. Policies change, so we read them again for your address.
Basements we have dug, close to South London.
Fulham·Basements
Fulham basements
Basements dug and finished by our team under Fulham terraces, across the river.
See the project
Clapham·Joinery
Clapham bespoke joinery
Wine storage and cabinetry in a Clapham house, made by Cochrane Bespoke.
See the projectCase study
What a basement costs in South London.
£180k to £300kConverting an existing basement. A project total, from our 2026 cost guide.
£500k to £900k+Digging a new basement. A project total, from our 2026 cost guide.
A South London basement is priced from its own survey and soil report.
Fees, party wall costs, contingency and VAT sit outside both.
Open the calculatorThe 2026 cost guideBasement costs in fullCan I build it here?
What South London owners ask about basements.
In South London
- Every service in Battersea and Clapham
- Design and build in South London
- Party wall surveying in South London
- Planning consultants in South London
- MEP services in South London
Basements nearby
- Basement construction across London
- Basement case studies in London
- Basement conversion in Fulham
- Basement construction in Chelsea
- Basement construction in Kensington
- Basement construction in St John’s Wood
- Basement construction in South Kensington
- Basement construction in Knightsbridge
- Basement construction in Belgravia
- Basement construction in Mayfair
- Basement construction in Marylebone
- Basement construction in Holland Park
- Basement construction in Hampstead
- Basement construction in Notting Hill
- Basement construction in Clapham
- Basement construction in Weybridge
- Basement construction in Cobham
- Basement construction in Oxshott
- Basement construction in Highgate
- Basement construction in Primrose Hill
- Basement construction in Earl’s Court
- Basement construction in Pimlico
- Basement construction in Westminster
- Basement construction in West London
- Basement construction in South West London
- Basement construction in North London
- Battersea and Clapham
- Wandsworth, Putney and Barnes
- Dulwich
- Wimbledon
Further reading, from the blog
Can I add a basement to a South London terrace?
Often, yes, as a single storey under the house.
Lambeth looks for most of the rear garden to stay as soil.
Which borough decides a basement in Battersea or Clapham?
Clapham is mostly Lambeth. Around Clapham Junction it is Wandsworth.
We confirm the borough before any engineer is briefed.
Does a South London basement need an impact assessment?
In Lambeth, yes. A Stage 1 screening goes in with the application.
It covers groundwater, ground stability and the houses either side.
How is sewer flooding handled in a new basement here?
A pumped device stops sewage backing up into the lower floor.
We design the sump and its access before the slab is cast.
What does a basement cost in South London?
Converting a cellar is £180k to £300k as a project total.
A new dig is £500k to £900k and more, from our 2026 cost guide.
See it builtNear South London
See it built.
Finished homes, designed, priced and built by NU.
Kensington · W8 New build
Kensington new-build houses
Two new-build houses with triple basements, built under one contract.
Case study
Chelsea · SW3 Townhouse
Chelsea townhouse, opened up and fitted out
A 4,300 sq ft townhouse with a new basement under its whole footprint.
Case study
Chelsea · SW3 Townhouse
Chelsea basement and extension
A new basement, a kitchen extension and a full interior renovation.
Case study
Tell us about your home in South London.
Your name and one way to reply are enough. It goes straight to the studio.
- Already have an architect or designer? We build to their design. Working with your designer
- An NDA on request, and your home is never published without your consent. How we work in confidence