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Permitted23/00027/FULLSubmitted 3 years agoLoft conversion

18 Castellain Road Westminster W9 1EZ

Variation of condition 1 of planning permission dated 2nd November 2022 (RN:22/04118/FULL) for the Replacement of roof, windows, doors and associated alterations to front and rear elevations; Replacement of rear dormer with larger dormer, installation of rooflight and creation of balcony at roof-level; Creation of balcony at ground floor level with new stair access leading to rear garden; Formation of new windows and doors to rear at ground and lower ground floor levels; associated with reconfiguration of existing flats (1 x 1 bed and 1 x 4 bed). Namely, alteration of roof pitch to rear, changes to rear fenestration and installation of rooflights.

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Map of the site

Progress

Submitted
25 Jan 2023
— completed
Validated
25 Jan 2023
— completed
Consultation
23 Feb 2023
— completed
Target date
22 Mar 2023
— completed
Decided
13 Apr 2023
— completed

Application details

Reference
23/00027/FULL
Local authority
Westminster
Postcode
W9 1EZ
Ward
LVW_22
Application type
All Other
Property type
Flat

Key dates

Submitted
25 Jan 2023
Validated
25 Jan 2023
Comments close
23 Feb 2023
Target decision
22 Mar 2023
Decided
13 Apr 2023

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

Inside the two years most owners do their major work — kitchens, bathrooms, rewires and lofts. 4 recent sales are listed below.

Homes here go for about £800,000 — the median of the last 8 market sales in W9 1EZ, £555,000 to £3,000,000.

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