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Permitted10/02988/FULLLoft conversion

21 Buckingham Palace Road 16 Warwick Row Westminster SW1W 0PN

Alterations and extensions to 21 Buckingham Palace Road including a mansard roof at fifth floor level, rear extension at first, second and third floor level and terraces at second, third and fifth floor level in connection with use of part basement, part ground and first to fifth floors as four self-contained residential flats. Use of part basement and part ground floor for either retail (Class A1) or financial and professional services (Class A2). Demolition of 16 Warwick Row and erection of a seven storey building with terrace at roof level for use as three self-contained residential flats with one garage parking space and bicycles store.

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Progress

Submitted
—
— completed
Validated
—
— completed
Consultation
—
— completed
Target date
—
— completed
Decided
8 Jul 2010
— completed

Application details

Reference
10/02988/FULL
Local authority
Westminster
Postcode
SW1W 0PN
Ward
ST. JAMES'S
Application type
All Other
Property type
Flat

Key dates

Decided
8 Jul 2010

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 £1,800,000 — the median of the last 5 market sales in SW1W (the wider postcode district), £330,000 to £11,000,000.

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