Child’s room under the roof, with two rooflights.

Loft conversions in West London.

Fulham · SW6 · Fulham house, refurbished throughoutCase study

Dormers and mansards on West London roofs, designed with the whole terrace in mind.

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A West London roof, read with the whole terrace.

Policy CD12
Roofs judged with their neighbours
Dormer or mansard
Settled once the terrace is read
Upper flats
Freeholder consent as well as planning

NU Projects is a design and build company in Fulham SW6, founded in 2010. We handle loft conversions, dormers and mansards in West London W/SW, under one contract. 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.

A loft here is judged by the street as much as by the house. Where a terrace roofline is untouched, an added storey is usually resisted.

Where several neighbours have already built up, filling the gap can be accepted. So we walk the street before we draw anything.

Fulham’s guidance treats front roof extensions as generally unacceptable. So dormers sit at the back. In Kensington and Chelsea, a mansard depends on the neighbours.

We renewed a Fulham family house from the basement to the roof. A Chelsea terrace we renovated finishes in a roof terrace.

What the borough allows on a West London roof.

Council
Kensington and Chelsea governs Chelsea, Kensington and Notting Hill, through its 2024 Local Plan. Fulham sits with Hammersmith and Fulham.
Policy CD12
Roof changes must suit the character of the building and its group.
Intact terraces
No extra storey where the group roofline is unaltered.
Broken terraces
Where several houses already rose, filling the gaps can be accepted.
Pitched roofs
Roofs with eaves are named as unsuitable for an added storey.
Upper flats
A flat has no householder permitted development rights. The freeholder must also agree.

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 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.

A West London roof is priced once the terrace has been read.

Guide figures are project totals.

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

Open the calculatorThe 2026 cost guideCan I build it here?

Can I add a mansard to my West London house?

It depends on the terrace. An unbroken roofline usually rules one out.

Where neighbours have already built up, infill can be accepted.

Do loft conversions in West London need planning?

In conservation areas, roof permitted development rights do not apply.

Most of Kensington and Chelsea is conservation area.

Outside them, a Fulham terrace may add up to 40 cubic metres.

Can I convert the loft above my flat?

A flat has no householder permitted development rights.

Planning is needed, and the freeholder must agree too.

What does a West London loft conversion cost?

A dormer loft runs £90k to £140k, from our 2026 cost guide.

A mansard is £140k to £220k. Both are project totals.

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