Living room with a glazed wall onto a planted light well.

Loft conversions in Holland Park.

Kensington · W8 · Kensington new-build housesCompleted work, photograph

Holland Park villas often come in pairs. Their roofs are judged together.

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A Holland Park villa roof, shared with its twin.

Pairs
Semi-detached villas read as one building
Listed
Some villas carry listed status
W11 · W14
Villas set back behind front gardens

NU Projects is a design and build company in Fulham SW6, founded in 2010. We handle loft conversions, dormers and mansards in Holland Park W11, 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.

Holland Park is larger villas, many semi-detached, set back behind generous gardens.

A semi-detached pair was designed as a single composition. Raise one half and the symmetry goes.

The borough’s Policy CD12 weighs any roof change against the pair and its group.

Some villas are listed. Their roof structure and top rooms then fall under listed consent.

A coordinated scheme with the neighbour can help. So can working inside the existing roof.

What the borough allows on a Holland Park villa.

Council
Royal Borough of Kensington and Chelsea. The western edge meets the next borough, so we confirm it.
Policy CD12
A roof alteration must suit the villa and its group.
Rooflines
An added storey is resisted where the group roofline remains unimpaired.
Listed villas
Some are listed. Consent then covers the roof timbers and interiors too.
Conservation areas
Holland Park sits within them. Roof permitted development does not apply.

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.

Close by, in the same borough.

Family room with a grey corner sofa below a floating stair.

Kensington·New build

Kensington new-build houses

Close by in Kensington W8. New houses we built, with light brought deep inside.

See the project
Stairwell hung with three framed photographs of spiral staircases.

Chelsea·Townhouse

Chelsea townhouse, opened up and fitted out

Nearby in Chelsea. A townhouse we opened up and fitted out.

See the project

Completed work, photographs

What a loft conversion costs in Holland Park.

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

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

A villa roof is wider than a terrace’s, so the floor area grows.

The guide figures are project totals.

Fees, party wall costs, contingency and VAT sit outside both.

Open the calculatorThe 2026 cost guideCan I build it here?

Can one half of a Holland Park semi-detached villa add a roof storey alone?

It is hard. The pair reads as one building, so lopsided roofs are resisted.

A joint design with the neighbour stands a better chance.

Does a listed Holland Park villa need extra consent for loft work?

Yes. Listed consent can cover the roof structure and the top rooms.

That applies even to work hidden from the street.

Can a Holland Park villa use its existing roof space without raising it?

Often. Insulating, lining and lighting the void changes no roofline.

Rooflights still need checking in a conservation area.

Are rear dormers allowed on Holland Park villas set in big gardens?

Possibly, where the rear roof is not prominent.

Policy CD12 still asks it to suit the villa and its group.

Planning is needed, as the area is conservation land.

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