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12 Chester Street London SW1X 7BB

26/01507/FULLApproved
Discharge / amendments

Approved on 30 April 2026

Site boundary (council red line)

Proposal

Variation of Condition 1 and removal of Conditions 3, 4 and 9 of planning permission dated 24 July 2025 (RN 24/05883/FULL) (as amended by 26/00535/NMA dated 16 March 2026) for: replacement of existing rear extension at first, second and third with a new rear extension (first to third floor level) with flat roof. Erection of an extension at rear ground floor level. Removal of the existing kitchen rooflight and extension of existing terrace at first floor level. Replacement of existing windows and French doors with new; namely, to omit the approved basement, lightwell at rear lower ground floor and railings at rear ground floor; amendment to the French door width at rear first floor level.

Submitted
9 March 2026
  1. Received9 Mar
  2. Validated
  3. Consult.
  4. Target
  5. Decided30 Apr

Decided in 52 days

About this application

This is a planning application for a rear extension at 12 Chester Street London SW1X 7BB. Westminster has handled 27,078 applications of this type. This one was decided in 52 days, 3 days longer than Westminster's typical decision time. The site is in the Belgravia conservation area, with 16 listed buildings nearby. There have been 4 other applications at this address. We hold 1,284 applications in total for the SW1X postcode area.

Application details

Postcode
SW1X 7BB

Site constraints

Checking the site
2/3
Council recordsAppealsFlood risk

Designations that overlap or adjoin the site outline.

  • Conservation area: Belgravia
  • Listed building: Grade II: 8-14, Chester Street Sw1On this site · +1 more
  • 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.

Associated applications

  1. 2026
    9 Mar

    Variation of Condition 1 and removal of Conditions 3, 4 and 9 of planning permission dated 24 July 2025 (RN…

    This applicationApprovedVariation of conditions (s73)26/01507/FULL
  2. 2026
    29 Jan

    Amendment to planning permission dated 24th July 2025 (RN 24/05883/FULL

    ApprovedNon-material amendmentPart of26/00535/NMA

Source: Westminster

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

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