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26 Upper Montagu Street London W1H 1RP

25/08746/FULLFull Planning Permission ApplicationRefused
Full

Refused on 17 June 2026

Site boundary (council red line)

Proposal

Erection of a two storey rear extension and internal reconfiguration of HMO.

Received
1 December 2025
Public comments
3
Ward
Marylebone
Agent
Logic Planning
  1. Received1 Dec
  2. Validated1 Dec
  3. Consult.
  4. Target26 Jan
  5. Decided17 Jun

Decided in 198 days (council typically 49)

About this application

This is a full planning application for a two storey rear extension at 26 Upper Montagu Street London W1H 1RP. Westminster has handled 4,484 applications of this type. This one was decided in 198 days, 21 weeks longer than Westminster's typical decision time. The site is in the Portman Estate conservation area, with 20 listed buildings nearby. There has been 1 other application 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 1RP
Application type
Full Planning Permission Application
Scale / size
Small

Planning application dates

Date validated
1 December 2025
Consultation expiry
25 March 2026
Target decision date
26 January 2026

Applicant and agent

Agent
Logic Planning
Agent address
Flat 1 25 Lordship Park Hackney London N16 5UN United Kingdom

Planning decision

Statutory period
56 days

Publicity

Last advertised
4 March 2026
Advertisement expiry
25 March 2026
Site notice start
19 February 2026
Site notice end
12 March 2026

Additional information

Planning Portal ID
PP-14525642
Documents
18

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: 28, Upper Montagu Street W1On or next to this site
  • 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.

© 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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