BasementsFulham SW6
Basement conversion in Fulham.
Cellar conversions and new basements under Fulham terraces. Designed, engineered and built from our studio on Fulham High Street.
What a Fulham basement involves.
NU Projects is a design and build company in Fulham SW6, founded in 2010. We handle basement conversion and construction in Fulham SW6, under one contract. A basement runs £450 to £500 a sq ft, construction only. Call 020 7731 6841, and a budget estimate typically follows within seven days.
Most Fulham houses are Victorian terraces on narrow plots. Many already have a cellar under the front, or a void under the floor.
So a Fulham basement takes one of three shapes. The first fits out the cellar. The second lowers and widens it. The third digs a new floor under the house.
Each one is a party wall job, since the terraces share their walls. Much of Fulham sits near the river. Flood risk is designed in from day one.
The studio is on Fulham High Street. Our joinery partner, Cochrane Bespoke, works from the same street.
What the council allows.
- Council
- London Borough of Hammersmith and Fulham. Kensington and Chelsea’s CL7 does not apply here.
- Size
- Local Plan Policy DC11 allows one storey. Into the garden, it may reach half the house’s depth at most. It may also cover half the garden’s depth at most.
- The garden
- The garden left over must stay in one piece. At least one metre of soil goes over any part under the garden.
- Lightwells
- A lightwell at the front or side must be as discreet as possible. The terrace should look largely unchanged.
- Flood risk
- Over 60% of the borough is in flood zones 2 and 3. The Thames defences protect it, but a flood risk assessment is still needed.
- The application
- A construction method statement, written by a qualified engineer. A construction traffic management plan sits inside it.
Source: Hammersmith and Fulham’s Local Plan 2018, Policy DC11. Read on 2 October 2026. Policies change, so we read them again for your address.
Built near the studio.
Fulham·New build
Fulham new-build houses
Four new houses in the same borough, designed and built under one contract.
See the project
Chelsea·Townhouse
Chelsea basement and extension
A new basement and kitchen extension, across the borough line in Chelsea.
See the projectCompleted work, photographs
What it costs.
£450 to £500a sq ft, construction only. Our basement band.
£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.
These are two kinds of figure. The band is a rate per square foot, construction only.
The cost guide figures are whole project totals. Fees, party wall costs, contingency and VAT sit outside them.
Groundwater, party walls and access move the figure, so we price the house itself.
Open the calculatorThe 2026 cost guideBasement costs in full
Basements in Fulham, answered.
Can I convert the cellar under my Fulham house?
Usually, yes. Many Fulham terraces have a cellar or a void under the front.
Fitting it out is the smallest job. Lowering it adds underpinning and party wall work.
We survey it first, then tell you which of the three it is.
How far can a Fulham basement go under the garden?
Policy DC11 sets two limits, and both apply at once.
Half the depth of the garden, and half the depth of the house.
The rest of the garden must stay in one piece.
Does flood risk stop a basement in Fulham?
Not usually, but it shapes the design.
Over 60% of the borough sits in flood zones 2 and 3.
A self-contained basement flat needs a safe way out in the rapid inundation zone.
Pumped drainage and a non-return valve are designed in from the start.
Do you need planning permission for a Fulham basement?
A basement under the garden, or one with a new lightwell, needs planning.
The application carries a construction method statement and a traffic plan.
We prepare both, with the drawings, as part of the design.
What does a basement in Fulham cost?
Our basement band is £450 to £500 a sq ft, construction only.
Our 2026 cost guide puts a conversion at £180k to £300k, all in.
A new dig runs £500k to £900k and more.
Related pages.
In Fulham
From the journal358 notes, free to read
Fulham, written up.
-
3 min read
Basement waterproofing and pumps in London
What keeps a London basement dry. Waterproofing as one coordinated design, when pumps are needed, alarms, servicing and costs.
-
5 min read
The real cost of a London basement: what homeowners need to know before starting
What a London basement actually costs in 2026. Shell against fit out, what sits outside the build rate, fees, contingency and the hidden risks.
-
3 min read
Basement extensions in London: what homeowners need to know before they dig
Everything London homeowners need to know about basement extensions. Planning, costs, party walls, and construction advice from NU Projects.
Basements, Fulham
Tell us about your home.
Your name and one way to reply are enough. It goes straight to the studio.