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Permitted14/07155/FULLLoft conversion

34-40 Great Cumberland Place Westminster W1H 7TW

Erection of a mansard roof on the Quebec Mews façade to provide three additional bedrooms and associated extension of the existing staircase access. Landscaping and highways alterations at the front of the hotel.

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Map of the site

Progress

Submitted
—
— completed
Validated
—
— completed
Consultation
—
— completed
Target date
—
— completed
Decided
17 Aug 2016
— completed

Application details

Reference
14/07155/FULL
Local authority
Westminster
Postcode
W1H 7TW
Ward
BRYANSTON AND DORSET SQUARE
Application type
All Other
Property type
Commercial

Key dates

Decided
17 Aug 2016

Estimated project value

£37k–£100k

Typical UK cost for this job type, at inner London rates (2026). Estimated from the proposal description — planning applications do not state build cost. Source: Checkatrade 2026 loft conversion cost guide.

Recently sold nearby

New owners, recently moved in. First work on a house usually follows within months of completing. 8 recent sales are listed below.

Homes here go for about £820,000 — the median of the last 7 market sales in W1H (the wider postcode district), £500,000 to £2,367,000.

Contains HM Land Registry data © Crown copyright and database right 2026. This data is licensed under the Open Government Licence v3.0. Sales are matched by postcode, not by property, so a sale listed here may be a neighbouring address. England and Wales only.

Planning constraints

No designations recorded at this location. This is not a formal search — always confirm with the local authority before relying on it.

Designations from planning.data.gov.uk, Open Government Licence v3.0. Indicative only — not a formal local authority search.

Nearby applications