21 Upper Montagu Street London W1H 2PQ

25/08055/FULLFull Planning Permission ApplicationApproved

Full

Approved on 24 March 2026

Site boundary (council red line)

Proposal

Replacement of single-glazed timber sash windows with slimline double-glazed timber sash windows to match the original in appearance, detailing and materials. (Linked to 25/08056/LBC)

Received: 5 November 2025
Council: City of Westminster
Ward: Marylebone
Agent: Studio Hale

ReceivedReceived5 Nov
ValidatedValidated5 Nov
Consult.Consultation
TargetTarget Date31 Dec
DecidedDecided24 Mar

Decided in 139 days (council typically 49)

About this application

This is a full planning application for window replacement at 21 Upper Montagu Street London W1H 2PQ. Westminster has handled 4,484 applications of this type. This one was decided in 139 days, 13 weeks longer than Westminster's typical decision time. The site is in the Portman Estate conservation area, with 20 listed buildings nearby. There have been 6 other applications at this address. In the past year there have been 168 applications across Marylebone. We hold 896 applications in total for the W1H postcode area.

86% of full 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: W1H 2PQ
Application type: Full Planning Permission Application
Scale / size: Small

Planning application dates

Date validated: 5 November 2025
Target decision date: 31 December 2025

Applicant and agent

Agent: Studio Hale
Architect profile: STUDIO HALE LIMITED
Agent address: 26 Princethorpe House London W2 5SU United Kingdom

Planning decision

Statutory period: 56 days

Additional information

Planning Portal ID: PP-14460522
Comments: 0
Documents: 16

Site constraints

Checking the site

2/3

Council recordsAppealsFlood risk

Designations that overlap or adjoin the site outline.

Conservation area: Portman Estate
Listed building: Grade II: 105A, CRAWFORD STREET W1 (See details for further address information)On this site · +1 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.

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 Nov
Replacement of single-glazed timber sash windows with slimline double-glazed timber sash windows to match the…
This applicationApprovedFull25/08055/FULL
2025
5 Nov
Replacement of existing non-original single-glazed timber sash windows with new slimline double-glazed timber…
ApprovedListed building consentPart of25/08056/LBC

Planning history at this site

7 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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