11, 12 William Street Westminster SW1X 9HL

Progress

Recently sold nearby

Inside the two years most owners do their major work — kitchens, bathrooms, rewires and lofts. 4 recent sales are listed below.

• APARTMENT 5, 1 WILLIAM STREET, LONDON, SW1X 9HLFlat or maisonette · Leasehold · £17,668,8126 months ago15 Apr 2026
• APARTMENT 9, 1 WILLIAM STREET, LONDON, SW1X 9HLFlat or maisonette · Leasehold · £1,500,0009 months ago20 Jan 2026
• APARTMENT 6, 1 WILLIAM STREET, LONDON, SW1X 9HLFlat or maisonette · Leasehold · £23,250,00011 months ago21 Nov 2025
• APARTMENT 9, 1 WILLIAM STREET, LONDON, SW1X 9HLFlat or maisonette · Leasehold · £2,550,00013 months ago30 Sept 2025
• APARTMENT 7, 1 WILLIAM STREET, LONDON, SW1X 9HLFlat or maisonette · Leasehold · £2,650,0002 years ago12 Mar 2024
• APARTMENT 4, 1 WILLIAM STREET, LONDON, SW1X 9HLFlat or maisonette · Leasehold · £15,200,0003 years ago29 Sept 2023

Homes here go for about £8,925,000 — the median of the last 6 market sales in SW1X 9HL, £1,500,000 to £23,250,000.

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.

Recorded changes

• 6 Nov 2026: Approved
• 5 Nov 2026: The proposal was amended
• 30 Oct 2026: The proposal was amended
• 22 Oct 2026: The proposal was amended
• 25 Sept 2026: The proposal was amended

Nearby applications

• 11, 12 William Street Westminster SW1X 9HLPermittedNext door
• WestminsterPermittedNext door
• WestminsterPermittedNext door
• WestminsterRefusedNext door
• WestminsterPermittedNext door
• WestminsterPermittedNext door