Reception room with a long fire and bronze lined shelving.

Planning consultants in Belgravia.

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

Planning in Belgravia, where new space usually goes up into a mansard. Garden rooms are rarely the answer.

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Adding space in Belgravia, upward, not outward.

March 2024
Belgravia Neighbourhood Plan made
Mansards
The favoured way to add space
SW1X · SW1W
City of Westminster

NU Projects is a design and build company in Fulham SW6, founded in 2010. We handle planning applications and appeals in Belgravia SW1, under one contract. Fees are priced per project by our own quantity surveyor, from the actual scope. Call 020 7731 6841, and a budget estimate typically follows within seven days.

Belgravia was built to a single estate plan. Cream terraces line private squares, and mews run behind. Almost the entire district is a conservation area.

Two documents now decide most schemes. Westminster’s City Plan is one. The Belgravia Neighbourhood Plan, made in March 2024, is the other.

That local plan prefers new floorspace at roof level, in a mansard. It is cool on digging beneath mews, which mostly never had cellars. Part of the area also sits on high groundwater.

A mansard bid succeeds on detail. Pitch, dormer rhythm, leadwork and slate are drawn against both neighbours. Policy BEL4 then wants noise, dust and vibration controlled during the build.

Inside a listed house, the historic sequence of rooms is protected. Grosvenor often holds the freehold and grants its own licence. Our Belgravia apartment was finished in 2022.

What Westminster and the plan ask in Belgravia.

Council
Westminster City Council, for both planning and listed building consent.
Neighbourhood plan
Made March 2024. Roof additions preferred, mews basements discouraged.
Construction
BEL4 requires a plan for noise, dust and vibration next door.
Plan form
A listed interior keeps its original room sequence.
The estate
Grosvenor’s licence runs alongside consent where it owns the freehold.
Ground
High water in places. Several cellars flooded there in July 2021.

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 and around Belgravia.

Entrance lobby with blue velvet chairs and a bronze door.

Belgravia·Apartment

Belgravia apartment, full refurbishment

A 2,000 sq ft Belgravia apartment, refurbished throughout and completed in 2022.

See the project
Living room with a fireplace, tall windows and a chandelier.

Knightsbridge·Townhouse

Knightsbridge townhouse, whole house refurbishment

A townhouse refurbishment close by in Knightsbridge, our third commission there.

See the project

Completed work, photographs

What planning costs in Belgravia.

A mansard application carries more drawings than a flat refit.

Our quantity surveyor fixes the fee in writing before work begins.

Open the calculatorThe 2026 cost guide

Is a mansard likely to win consent on a Belgravia terrace?

The 2024 plan leans towards roof level additions of that kind.

An untouched, complete roofline still counts against one.

We photograph the neighbouring roofs first.

Is a basement realistic under a Belgravia mews house?

The local plan discourages them.

Few mews ever had cellars, and groundwater runs high in parts.

We usually look up, or rework the ground floor.

Which paint colour suits a Belgravia stucco front?

Westminster asks for the colour already established along the terrace.

Brilliant white is avoided unless that is the terrace colour.

What does Policy BEL4 ask of a Belgravia building project?

A clear account of how noise, dust and vibration will be held down.

We include that statement in the submission itself.

Tell us about your home in Belgravia.

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What is the work?

We call you back within the hour, in working hours. Your details go to the studio and our email system. Read the privacy note.