Bedroom under the eaves, with a fireplace and three windows.

Loft conversions in South West London.

Fulham · SW6 · Fulham Victorian houseCase study

A bedroom and bathroom in the roof, where the terrace allows it. We read the roofline first, then design, consent and build.

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The roofline decides first.

Policy CD12
Kensington and Chelsea’s test for roofs
Mansard or dormer
Set by the house and its neighbours
Stair first
Drawn before the roof itself

NU Projects is a design and build company in Fulham SW6, founded in 2010. We handle loft conversions, dormers and mansards in South West London SW. A main dormer loft typically runs £90k to £140k. A mansard loft runs £140k to £220k. Call 020 7731 6841, and a budget estimate typically follows within seven days.

Across the SW postcodes, the terrace matters more than the house. Where a row keeps an unbroken roofline, an extra storey is hard to win. Where neighbours have already built up, an infill may be allowed.

Fulham’s two storey terraces often take a rear dormer. Taller Chelsea and Earl’s Court houses suit a mansard, where the group allows. Belgravia sits under Westminster’s own neighbourhood plan.

Inside, the stair is the hard part. It must reach the new floor without stealing a bedroom below. We draw the stair before the roof.

Steel, insulation and the new roof go on under one scaffold. Plumbing for the new bathroom follows existing service runs down the house.

What Kensington and Chelsea says about roofs.

Council
Royal Borough of Kensington and Chelsea, under its Local Plan adopted in 2024.
Policy CD12
Roof changes must suit the character of the building and its group.
Existing mansards
A building or terrace that already has an extra storey is resisted.
Pitched roofs
Roofs with eaves are named as unsuitable for an added storey.
Infill
Where a terrace already has varied roof extensions, infilling can be permitted.
Dormers
Original dormers of interest are kept, even where neighbours altered theirs.

Source: Kensington and Chelsea’s Local Plan 2024, Policies CD12 and CD13. Read on 6 October 2026. Policies change, so we read them again for your address.

What a loft conversion costs in South West London.

£140k to £220kA mansard loft. A project total, from our 2026 cost guide.

£90k to £140kA dormer loft. A project total, from our 2026 cost guide.

An SW roof is priced once the terrace and its neighbours are read.

Both figures are project totals.

Fees, party wall costs, contingency and VAT are added to each.

Open the calculatorThe 2026 cost guideCan I build it here?

Can I add a mansard to my Chelsea or Earl’s Court house?

Only where the terrace roofline is already broken.

An intact roofline makes an extra storey hard to win.

Will a Fulham loft need planning permission?

Not always. Outside conservation areas, a terrace may add up to 40 cubic metres.

Inside a conservation area, it goes through planning.

Is a dormer or a mansard better for an SW terrace?

A dormer usually costs less and suits many Fulham roofs.

A mansard gives a full storey but faces more tests.

Can a top floor flat owner convert the loft above?

Only with the freeholder’s agreement, bought separately.

Flats have no householder permitted development rights.

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