64 St James's Street Westminster SW1A 1NF
Amendments to planning permission dated 02 September 2021 (RN: 21/02158/FULL) for the: 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, to allow an increase in the footprint of the rooftop plant enclosure, increase in height of the roof-level railing and increase in floor level.
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Progress
Application details
- Reference
- 26/06009/NMA
- Local authority
- Westminster
- Postcode
- SW1A 1NF
- Ward
- SJW_22
- Application type
- All Other
- Property type
- Commercial
Key dates
- Submitted
- 3 Sept 2026
- Validated
- 3 Sept 2026
- Target decision
- 1 Oct 2026
- Decided
- 9 Oct 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.
Recorded changes
- 10 Oct 2026: Approved
- 9 Oct 2026: The proposal was amended
Nearby applications
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