12, Upper Belgrave Street, SW1X 8BA

25/01251/NMANon-Material AmendmentApproved

Approved on 22 May 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

Amendments to planning permission dated 31 August 2023 (RN: 23/01615/FULL) for: External alterations including replacement of the attic style roofs with mansard roof extensions, installation of new mechanical plant within an enclosure, new sliding rooflight and replacement of the existing rooflight with a new rooflight and planters to proposed roof level terrace and raised parapet. Installation of new windows and doors. Namely, to allow the recessing of the rainwater pipe within the wall at lower ground and ground floor; removal of the sealed gate at street level and replacement with matching railings; replacement internal door at second floor level; and installation of a satellite dish and air bricks.

Submitted: 5 March 2025
Council: City of Westminster

ReceivedSubmitted5 Mar
ValidatedValidated
Consult.Consultation
TargetTarget Date
DecidedDecided22 May

Decided in 78 days (council typically 49)

About this application

This is a planning application for an extension at 12, Upper Belgrave Street, SW1X 8BA. Westminster has handled 230 applications of this type. This one was decided in 78 days, 4 weeks longer than Westminster's typical decision time. The site is in the Belgravia conservation area, with 10 listed buildings nearby. There have been 7 other applications at this address. In the past year there have been 173 applications across KBW_22. We hold 1,288 applications in total for the SW1X postcode area.

87% of non-material amendment 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: SW1X 8BA
Application type: Non-Material Amendment

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: 16a, Wilton Street Sw1On this site · +2 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.

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

2025
5 Mar
External alterations including recessing of the rainwater pipe within the wall at lower ground and ground…
ApprovedListed building consentFiled alongside25/01250/LBC
2025
5 Mar
Amendments to planning permission dated 31 August 2023 (RN: 23/01615/FULL
This applicationApprovedNon-material amendment25/01251/NMA

Planning history at this site

11 other applications at this property, newest first.

Source: Westminster

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

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