Reception room with a long fire and bronze lined shelving.

Loft conversions in Belgravia.

Belgravia · SW1 · Belgravia apartment, full refurbishmentCompleted work, photograph

In Belgravia, upward space usually means a mansard. The neighbourhood plan says so.

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Belgravia grows upwards, by a mansard.

March 2024
Belgravia Neighbourhood Plan made
Mansards
The favoured way to add space
Grosvenor
Licence often needed beside consent

NU Projects is a design and build company in Fulham SW6, founded in 2010. We handle loft conversions, dormers and mansards in Belgravia SW1, 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.

Belgravia was laid out as one estate. Its white stucco terraces face private garden squares.

The neighbourhood plan, made in March 2024, leans towards space added in a mansard. It discourages basements in mews.

That makes the roof the natural place to grow. Westminster still refuses roof storeys on unaltered terraces.

Much of the stock is Grade II listed. Consent can cover the roof timbers and top floor rooms.

Where Grosvenor holds the freehold, its licence runs beside the council’s decision.

What Westminster allows on a Belgravia roof.

Council
City of Westminster, for planning and listed building consent.
Neighbourhood plan
Made in March 2024. Upward space by a mansard is favoured, where it suits.
Unaltered terraces
Westminster refuses roof extensions where a complete group keeps its roof line.
Listed buildings
Much of the stucco is Grade II. Consent reaches roof structure and upper rooms.
The estate
Where Grosvenor holds the freehold, its licence sits beside council consent.
Neighbours
Policy BEL4 asks how noise, dust and vibration next door will be kept down.

Source: Westminster’s City Plan Policy 50, and the Belgravia Neighbourhood Plan of March 2024. Read on 3 October 2026. Policies change, so we read them again for your address.

Our work in Belgravia.

Entrance lobby with blue velvet chairs and a bronze door.

Belgravia·Apartment

Belgravia apartment, full refurbishment

A Belgravia apartment we refurbished in full, in SW1.

See the project

Completed work, photographs

What a loft conversion costs in Belgravia.

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

A listed Belgravia mansard needs more drawing and a longer consent route.

The guide figure is a project total.

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

Open the calculatorThe 2026 cost guideCan I build it here?

Why does the Belgravia Neighbourhood Plan prefer a mansard?

It leans towards upward space by a mansard where it suits the house.

It also discourages basements in mews.

So the roof often becomes the place to grow.

Will a mansard be refused on an untouched Belgravia terrace?

Very possibly. Westminster resists roof storeys on complete, unaltered groups.

A terrace that already has several mansards gives a better case.

Can a Belgravia mews house gain a floor instead of a basement?

That is the route the neighbourhood plan points towards.

The design must still suit the mews as a whole.

Grosvenor’s licence may be needed too.

Does Grosvenor need to approve my Belgravia roof works?

Where it is the freeholder, usually yes.

Its licence sits alongside planning and listed consent.

We prepare one set of drawings for all three.

Tell us about your home in Belgravia.

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