50 Marshall Street Westminster W1F 9BQ
Amendments to planning permission dated 18 December 2018 (RN: 18/06875/FULL) for: Demolition of rear glazed pitched roof and erection of rear extensions at third and fourth floors, extension at fifth floor and new fifth floor terrace, all for office purposes (Class B1). Replacement of existing mansard roofs and alterations at roof level including installation of plant enclosed by acoustic louvres and trellising and new roof terrace and staircase housing enclosed by planted trellis. Use of ground floor as retail (Class A1) floorspace and installation of replacement windows throughout, new shopfronts to ground floor retail units, replacement entrance gates and associated alterations - NAMELY, to allow alterations to plant enclosure by installing a specialist acoustic casing for the condenser unit.
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Progress
Application details
- Reference
- 19/03395/NMA
- Local authority
- Westminster
- Postcode
- W1F 9BQ
- Ward
- WEA_02
- Application type
- All Other
- Property type
- Commercial
Key dates
- Submitted
- 3 May 2019
- Validated
- 3 May 2019
- Target decision
- 31 May 2019
- Decided
- 13 May 2019
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.
- GROUND AND LOWER GROUND FLOOR PREMISES, 68 - 70 WARDOUR STREET, LONDON, W1F 0TBOther · Leasehold · Not a standard market sale · £240,0002 months ago13 Jul 2026
- 76 BREWER STREET, LONDON, W1F 9TXOther · Not a standard market sale · £3,500,0002 months ago10 Jul 2026
- FLAT 66, 1 - 6 DUFOURS PLACE, LONDON, W1F 7SHFlat or maisonette · Leasehold · £565,0003 months ago26 Jun 2026
- 7 POLAND STREET, LONDON, W1F 8PUTerraced · Not a standard market sale · £2,800,0004 months ago19 May 2026
- FLAT 12, CITY OF WESTMINSTER DWELLINGS, 20 MARSHALL STREET, LONDON, W1F 7ERFlat or maisonette · Leasehold · Not a standard market sale · £483,0006 months ago31 Mar 2026
- LOWER GROUND & GROUND FLOOR RETAIL UNITS, 19 - 25 BROADWICK STREET, LONDON, W1F 0DFOther · Leasehold · Not a standard market sale · £70,0007 months ago12 Feb 2026
- FLAT 8, 45 BROADWICK STREET, LONDON, W1F 9QWFlat or maisonette · Leasehold · Not a standard market sale · £540,0008 months ago19 Jan 2026
- FLAT 15, CITY OF WESTMINSTER DWELLINGS, 20 MARSHALL STREET, LONDON, W1F 7ERFlat or maisonette · Leasehold · Not a standard market sale · £395,0009 months ago10 Dec 2025
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
- WestminsterPermittedNext door
- WestminsterPermittedNext door
- 50 Marshall Street Westminster W1F 9BQPermittedNext door
- 50 Marshall Street Westminster W1F 9BQPermittedNext door
- 54 Marshall Street Westminster W1F 9BHPermittedNext door
- 54 Marshall Street Westminster W1F 9BHPermittedNext door