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Permitted26/03410/LBCSubmitted 3 months agoLoft conversion

17 Hertford Street Westminster W1J 7RS

Replacement of the mansard infill extension to the south east of the property by extending the existing bay upwards by a single storey (3-storeys total) and associated roof works to improve the internal space. (Linked with 26/03409/FULL)

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Progress

Submitted
11 Jun 2026
— completed
Validated
11 Jun 2026
— completed
Consultation
7 Jul 2026
— completed
Target date
6 Aug 2026
— completed
Decided
27 Aug 2026
— completed

Application details

Reference
26/03410/LBC
Local authority
Westminster
Postcode
W1J 7RS
Ward
WEW_22
Application type
All Other
Property type
House

Key dates

Submitted
11 Jun 2026
Validated
11 Jun 2026
Comments close
7 Jul 2026
Target decision
6 Aug 2026
Decided
27 Aug 2026

Estimated project value

£7k–£15k

Based on the 4.5m² of floor area stated in the application, at inner London rates (2026). Source: Checkatrade 2026, loft conversion £1,200-£2,500/m².

Floor area gained: 4.5m²

Recently sold nearby

Inside the two years most owners do their major work — kitchens, bathrooms, rewires and lofts.

Contains HM Land Registry data © Crown copyright and database right 2025. 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

  • 5 Sept 2026: Approved

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