1 Culross Street London W1K 2DL
Approved on 3 March 2026
Boundary © HM Land Registry, © Ordnance Survey · details
This information is subject to Crown copyright and database rights 2026 and is reproduced with the permission of HM Land Registry. The polygons (including the associated geometry, namely x, y co-ordinates) are subject to Crown copyright and database rights 2026 Ordnance Survey AC0000851063. Conditions of use.
Proposal
Excavation of a basement beneath 1A Culross Street, two vents at roof level and a single storey rear infill extension. (1A & 1 Culross Street)
- Received
- 14 July 2025
- Public comments
- 4
- Council
- City of Westminster
- Ward
- West End
- Agent
- Maddox Planning
- ReceivedReceived14 Jul
- ValidatedValidated20 Aug
- Consult.Consultation
- TargetTarget Date15 Oct
- DecidedDecided3 Mar
Decided in 195 days (council typically 49)
About this application
This is a full planning application for an extension at 1 Culross Street London W1K 2DL. Westminster has handled 4,484 applications of this type. This one was decided in 232 days, 26 weeks longer than Westminster's typical decision time. The site is in the Mayfair conservation area, with 20 listed buildings nearby. There are no previous applications recorded at this address. In the past year there have been 478 applications across West End. We hold 886 applications in total for the W1K postcode area.
86% of full applications at City of Westminster were approved. Across all application types, the council typically decides in about 7 weeks (median).
Based on decided applications received in the last 3 years.Planning something similar? See what gets approved on your street
Application details
- Postcode
- W1K 2DL
- Application type
- Full Planning Permission Application
- Scale / size
- Small
Planning application dates
- Date validated
- 20 August 2025
- Consultation expiry
- 1 October 2025
- Target decision date
- 15 October 2025
Applicant and agent
- Agent
- Maddox Planning
- Agent address
- 33 Broadwick Street London W1F 0DQ
Planning decision
- Statutory period
- 56 days
Publicity
- Last advertised
- 10 September 2025
- Advertisement expiry
- 1 October 2025
- Site notice start
- 28 August 2025
- Site notice end
- 18 September 2025
Additional information
- Planning Portal ID
- PP-14156650
- Documents
- 47
Site constraints
Designations that overlap or adjoin the site outline.
- Conservation area: Mayfair
- Article 4 direction: Article 4 Basement Development Permitted Rights Removed
- Flood zone 1: Low probability (rivers and sea)
Also checked, none recorded (21)
flood storage areas, tree preservation orders, green belt, scheduled monuments, World Heritage Sites, World Heritage Site buffer zones, registered parks and gardens, registered battlefields, Heritage at Risk entries, nutrient neutrality catchments, national parks, National Landscapes, SSSIs, Special Areas of Conservation, Special Protection Areas, Ramsar sites, ancient woodland, national nature reserves, local nature reserves, heritage coasts and brownfield registers.
A guide only, from official open data; it is not a planning search. Flood zones cover rivers and sea, not surface water.
Data © Crown copyright and others · sources and licences
Contains public sector information from planning.data.gov.uk (MHCLG and local planning authorities), licensed under the Open Government Licence v3.0. © Crown copyright and database right 2026.
© Historic England 2026. Contains Ordnance Survey data © Crown copyright and database right 2026. The Historic England GIS Data contained in this material was obtained on 2026-11-03. The most publicly available up to date Historic England GIS Data can be obtained from HistoricEngland.org.uk.
© Natural England copyright. Contains Ordnance Survey data © Crown copyright and database right 2026.
© Environment Agency copyright and/or database right 2026. All rights reserved. Flood Map for Planning, Open Government Licence v3.0.
Contains Ordnance Survey data © Crown copyright and database right 2026.
Source: Office for National Statistics licensed under the Open Government Licence v.3.0. Contains OS data © Crown copyright and database right 2026.
Source: Westminster
Contains public sector information from the Planning London Datahub, licensed under the Open Government Licence v3.0.
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Around this site
Nearby applications
- 14 Culross Street London W1K 2DZ24/06064/ADFULL · ConditionsAwaiting decision0.0 mi
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- 30 Grosvenor Square London W1K 6AN25/01376/ADLBC · ConditionsApproved0.0 mi
- 30 Grosvenor Square London W1K 6AN25/03001/ADLBC · ConditionsApproved0.0 mi
- 30 Grosvenor Square London W1K 6AN25/01206/ADFULL · ConditionsApproved0.0 mi
For applicants and trades
Contractors near this project
Find contractors for extensions near this site- Avent Roofing ServicesVerifiedWestminsterRoofing0.6 mi
- Atlas South Technical Service LimitedVerifiedLondonProperty MaintenanceHandyman1.1 mi
- Orient Construction Consultancy LimitedVerifiedLondon4.3 mi
- Nova Coat & PlasterVerifiedStreatham, LondonRenovations & RefurbishmentsPlastering5.1 mi
Planning something similar?
See what the council approved and refused for basements on your street. Pick your home and get the evidence before you pay for drawings.