25 - 27 St George Street London W1S 1FS

26/00885/NMANon-material amendmentsApproved

Discharge / amendments

Approved on 24 March 2026

Site boundary (council red line)

Proposal

Amendments to planning permission dated 11 August 2025 (RN: 25/01410/FULL) for Alterations to the elevations on St. George St and Masons Arms Mews; removal of the car lift to the basement parking from Masons Arms Mews; extensions at fourth, fifth, sixth and seventh floor levels for use as office accommodation (Class E) with new terraces at fourth, fifth, sixth and seventh floor levels. Installation of PV panels and green roof at main roof level; planting on the terraces; new external stair in the lightwell on the southern side of the building; creation of a new lightwell on the St. George Street side of the building including railings; new cycle parking facilities and associated works. NAMELY, to amend the approved position of the balustrade of the approved roof terrace at seventh floor level to increase terrace area

Received: 12 February 2026
Council: City of Westminster
Ward: West End

ReceivedReceived12 Feb
ValidatedValidated12 Feb
Consult.Consultation
TargetTarget Date12 Mar
DecidedDecided24 Mar

Decided in 40 days (council typically 49)

About this application

This is an application to amend a permission at 25 - 27 St George Street London W1S 1FS. Westminster has handled 604 applications of this type. This one was decided in 40 days, 9 days quicker than Westminster's typical decision time. The site is in the Mayfair conservation area, with 16 listed buildings nearby. There have been 6 other applications at this address. In the past year there have been 484 applications across West End. We hold 791 applications in total for the W1S 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: W1S 1FS
Application type: Non-material amendments
Scale / size: Small

Planning application dates

Date validated: 12 February 2026
Target decision date: 12 March 2026

Applicant and agent

Agent: Newmark
Agent address: One Fitzroy 6 Mortimer Street London W1T 3JJ United Kingdom

Planning decision

Statutory period: 28 days

Additional information

Planning Portal ID: PP-14656945
Comments: 0
Documents: 23

Site constraints

Checking the site

2/3

Council recordsAppealsFlood risk

Designations that overlap or adjoin the site outline.

Conservation area: Mayfair
Article 4 direction: Article 4 Basement Development Permitted Rights Removed+1 more
Brownfield land register: Nash House, 13 St George Street London W1S 1FERegister site at or near this address
Flood zone 1: Low probability (rivers and sea)

Also checked, none recorded (21)

flood storage areas, listed buildings, 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.

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

Planning history at this site

2 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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