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Permitted25/03688/FULLSubmitted over a year agoLoft conversion

54 Marshall Street Westminster W1F 9BH

Erection of single storey roof extension to provide additional Class E floorspace; replacement of windows with double glazed timber framed windows and replacement shopfront doors; and raising height of chimney stacks at 49 Beak Street [SITE INCLUDES 49 BEAK STREET].

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Progress

Submitted
20 Jun 2025
— completed
Validated
20 Jun 2025
— completed
Consultation
3 Dec 2025
— completed
Target date
15 Aug 2025
— completed
Decided
1 May 2026
— completed

Application details

Reference
25/03688/FULL
Local authority
Westminster
Postcode
W1F 9BH
Ward
WEW_22
Application type
All Other
Property type
Commercial

Key dates

Submitted
20 Jun 2025
Validated
20 Jun 2025
Comments close
3 Dec 2025
Target decision
15 Aug 2025
Decided
1 May 2026

Estimated project value

£87k–£180k

Based on the 53.3m² of floor area stated in the application, at inner London rates (2026). Source: Checkatrade 2026, loft conversion £1,200-£2,500/m².

Floor area gained: 53.3m²

Recently sold nearby

Inside the two years most owners do their major work — kitchens, bathrooms, rewires and lofts.

Contains HM Land Registry data © Crown copyright and database right 2025. 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.

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