11, 12 William Street Westminster SW1X 9HL

Progress

Estimated project value

£4k–£34k

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: trade estimate.

Recently sold nearby

Inside the two years most owners do their major work — kitchens, bathrooms, rewires and lofts. 3 recent sales are listed below.

• APARTMENT 9, 1 WILLIAM STREET, LONDON, SW1X 9HLFlat or maisonette · Leasehold · £1,500,0008 months ago20 Jan 2026
• APARTMENT 6, 1 WILLIAM STREET, LONDON, SW1X 9HLFlat or maisonette · Leasehold · £23,250,00010 months ago21 Nov 2025
• APARTMENT 9, 1 WILLIAM STREET, LONDON, SW1X 9HLFlat or maisonette · Leasehold · £2,550,00011 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 · £15,200,0002 years ago29 Sept 2023

Homes here go for about £2,650,000 — the median of the last 5 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.

Nearby applications

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