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Permitted25/01728/NMASubmitted over a year agoLoft conversion

4 Chesterfield Hill Westminster W1J 5BL

Amendments to planning permission dated 8th August 2024 (RN: 24/03734/FULL) for, 'Demolition and reconstruction of rear extensions at lower ground and ground floor level to create an enlarged first floor terrace; excavation of front pavement vaults; repairs to the front and rear facades; replacement of windows with double glazed timber windows; modifications to the rear mansard to create a concealed plant area and lift overrun, and new dormer windows; and associated alterations; all to alter and extend dwellinghouse (Class C3)'; Namely, external alterations, previous consented metal railings to rear party wall amended to brick wall with stone coping, flemish bond with pointing to match existing wall, second floor central bay timber tripartite sash window amended to narrower timber single sash window, adjustments to line of vertical wall to plant area within mansard and new natural Welsh slate to match existing.

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Progress

Submitted
13 Mar 2025
— completed
Validated
13 Mar 2025
— completed
Consultation
— completed
Target date
10 Apr 2025
— completed
Decided
28 Mar 2025
— completed

Application details

Reference
25/01728/NMA
Local authority
Westminster
Postcode
W1J 5BL
Ward
WEW_22
Application type
All Other
Property type
House

Key dates

Submitted
13 Mar 2025
Validated
13 Mar 2025
Target decision
10 Apr 2025
Decided
28 Mar 2025

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.

Homes here go for about £850,000 — the median of the last 5 market sales in W1J 5BL, £200,000 to £10,575,000.

Contains HM Land Registry data © Crown copyright and database right 2012. 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