17 William Mews Westminster SW1X 9HF
Variation of Condition 1 of planning permission dated 12 June 2025 (RN: 24/07507/FULL) for the erection of a roof extension and alterations to existing front elevation and fenestration; excavation of a new basement below part existing dwellinghouse; Namely, amendments to the ground floor windows.
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Progress
Application details
- Reference
- 26/04409/FULL
- Local authority
- Westminster
- Postcode
- SW1X 9HF
- Ward
- KBW_22
- Application type
- All Other
- Property type
- House
Key dates
- Submitted
- 7 Jul 2026
- Validated
- 7 Jul 2026
- Comments close
- 6 Aug 2026
- Target decision
- 1 Sept 2026
- Decided
- 18 Sept 2026
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
Nothing on this postcode has changed hands in the last two years. The sales below are for pricing rather than a lead.
- 5 WILLIAM MEWS, LONDON, SW1X 9HFTerraced · £2,190,0004 years ago1 Dec 2021
- 15 WILLIAM MEWS, LONDON, SW1X 9HFOther · Leasehold · Not a standard market sale · £3,500,8344 years ago5 Oct 2021
- 15 WILLIAM MEWS, LONDON, SW1X 9HFOther · Not a standard market sale · £3,500,8344 years ago5 Oct 2021
- 15 WILLIAM MEWS, LONDON, SW1X 9HFOther · Leasehold · Not a standard market sale · £3,500,8344 years ago5 Oct 2021
- 15 WILLIAM MEWS, LONDON, SW1X 9HFOther · Leasehold · Not a standard market sale · £3,500,8344 years ago5 Oct 2021
- 16 WILLIAM MEWS, LONDON, SW1X 9HFTerraced · Not a standard market sale · £3,800,0005 years ago30 Jun 2021
- 17 WILLIAM MEWS, LONDON, SW1X 9HFOther · Not a standard market sale · £2,530,0005 years ago14 May 2021
- 17B WILLIAM MEWS, LONDON, SW1X 9HFTerraced · Leasehold · £2,600,0006 years ago16 Mar 2020
Contains HM Land Registry data © Crown copyright and database right 2021. 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.
Recorded changes
- 19 Sept 2026: Approved
Nearby applications
- 17 William Mews Westminster SW1X 9HFPermittedNext door
- 17 William Mews Westminster SW1X 9HFPendingNext door
- 17 William Mews Westminster SW1X 9HFRefusedNext door
- 17 William Mews Westminster SW1X 9HFRefusedNext door
- 16A Lowndes Square Westminster SW1X 9HBPermittedAdjoining
- 16 Lowndes Square 16 William Mews Westminster SW1X 9HBPermittedAdjoining