64, 65 St James's Street Westminster SW1A 1NF
Amendments to planning permission dated 2 September 2021 (RN: 21/02158/FULL) for: Demolition of the existing mansard roof and removal of plant and escape stair; erection of new double mansard roof extension and rear extension for additional commercial floorspace (Use Class E); and installation of new escape stair, rear balconies, roof terrace and associated works namely; increase in height of internal stair core roof; solid hinged access hatch with integrated glazed AOV replaced with sliding glazed access rooflight and separate glazed AOV.
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Progress
Application details
- Reference
- 26/00434/NMA
- Local authority
- Westminster
- Postcode
- SW1A 1NF
- Ward
- SJW_22
- Application type
- All Other
- Property type
- Commercial
Key dates
- Submitted
- 26 Jan 2026
- Validated
- 26 Jan 2026
- Target decision
- 23 Feb 2026
- Decided
- 13 Mar 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.
- 64 - 65 ST JAMES'S STREET, LONDON, SW1A 1NFOther · Not a standard market sale · £35,930,0005 years ago25 Nov 2020
Contains HM Land Registry data © Crown copyright and database right 2020. 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
- 64 St James's Street Westminster SW1A 1NFPendingNext door
- 64, 65 St James's Street Westminster SW1A 1NFPermittedNext door
- WestminsterPermittedNext door
- 64, 65 St James's Street Westminster SW1A 1NFPermittedNext door
- 64, 65 St James's Street Westminster SW1A 1NFPermittedNext door