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1, Devonshire Close, London, W1G 7BA

25/05262/FULLHouseholder planning permissionRefused
Householder

Refused on 14 October 2025

Approximate site (title boundary)
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

The proposal is for the internal refurbishment of 1 Devonshire Close, including the addition of a mansard roof extension. On the ground floor, the existing living room will be converted into a bedroom. The current kitchen space will be reconfigured to accommodate a new laundry room, coat cupboard, and bathroom, as well as a staircase providing access to the existing terrace patio. On the first floor, the existing bedroom and en-suite will be redesigned to create a spacious master suite, comprising a bedroom, en-suite bathroom, and dressing area. The hallway will be reconfigured to include a study and additional storage. From this hallway, a new staircase will lead to the second floor, where the new mansard roof extension will house an open-plan kitchen, living, and dining area.

Submitted
21 August 2025
  1. Received21 Aug
  2. Validated
  3. Consult.
  4. Target
  5. Decided14 Oct

Decided in 54 days (council typically 49)

About this application

This is a planning application for an extension at 1, Devonshire Close, London, W1G 7BA. Westminster has handled 231 applications of this type. This one was decided in 54 days, 5 days longer than Westminster's typical decision time. The site is in the Harley Street conservation area, with 20 listed buildings nearby. There has been 1 other application at this address. In the past year there have been 195 applications across MBW_22. We hold 590 applications in total for the W1G postcode area.

77% of householder planning permission 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
W1G 7BA
Application type
Householder planning permission

Site constraints

Checking the site
2/3
Council recordsAppealsFlood risk

Designations that overlap or adjoin the site outline.

  • Conservation area: Harley Street
  • Listed building: Grade II: 100 and 102, Harley Street W1On this site · +15 more
  • Article 4 direction: Article 4 Basement Development Permitted Rights Removed+1 more
  • 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.

Associated applications

  1. 2025
    21 Aug

    The proposal is for an internal refurbishment of 1 Devonshire Close, including a rear extension as well as a…

    ApprovedFull planning permissionFiled alongside25/05261/FULL
  2. 2025
    21 Aug

    The proposal is for the internal refurbishment of 1 Devonshire Close, including the addition of a mansard…

    This applicationRefusedHouseholder25/05262/FULL

Source: Westminster

Contains public sector information from the Planning London Datahub, licensed under the Open Government Licence v3.0.

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