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3 Stanhope Gate London W1K 1AG

26/04390/NMANon-material amendmentsApproved
Discharge / amendments

Approved on 22 July 2026

Site boundary (council red line)

Proposal

Amendments to planning permission dated 21 April 2021 (RN: 21/01198/FULL) for the: Replacement windows to 3 Stanhope Gate and 18C Curzon Street elevations from ground to fifth floor with addition of applied external stone window architraves. NAMELY, changes to windows and door frame detail and colour.

Received
2 July 2026
Ward
West End
Agent
Mulroy Architects Ltd
  1. Received2 Jul
  2. Validated2 Jul
  3. Consult.
  4. Target30 Jul
  5. Decided22 Jul

Decided in 20 days (council typically 49)

About this application

This is an application to amend a permission at 3 Stanhope Gate London W1K 1AG. Westminster has handled 604 applications of this type. This one was decided in 20 days, 4 weeks quicker than Westminster's typical decision time. The site is in the Mayfair conservation area, with 20 listed buildings nearby. There has been 1 other application at this address. In the past year there have been 484 applications across West End. We hold 886 applications in total for the W1K postcode area.

88% of 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
W1K 1AG
Application type
Non-material amendments
Scale / size
Small

Planning application dates

Date validated
2 July 2026
Target decision date
30 July 2026

Applicant and agent

Agent
Mulroy Architects Ltd
Architect profile
MULROY ARCHITECTS LTD
Agent address
The Arts Building Morris Place London N4 3JG GB

Planning decision

Statutory period
28 days

Additional information

Planning Portal ID
PP-15055520
Comments
0
Documents
6

Site constraints

Checking the site
2/3
Council recordsAppealsFlood risk

Designations that overlap or adjoin the site outline.

  • Conservation area: Mayfair
  • Listed building: Grade II: 5, Stanhope Gate W1On or next to this site
  • Article 4 direction: Article 4 Basement Development Permitted Rights Removed
  • Brownfield land register: 4 Stanhope Gate London W1J 7FYRegister site at or near this address
  • Flood zone 1: Low probability (rivers and sea)
Also checked, none recorded (20)

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 and heritage coasts.

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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