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22 Seymour Place London W1H 7NJ

25/06754/FULLFull Planning Permission ApplicationApproved
Full

Approved on 3 March 2026

Site boundary (council red line)

Proposal

Retention of the existing extract duct with brick cladding and associated fans, and duct attenuation, along with the installation of three AC units within an acoustic enclosure at the rear ground-floor roof level.

Received
19 September 2025
Ward
Marylebone
Agent
Monmouth Planning Ltd
  1. Received19 Sep
  2. Validated25 Sep
  3. Consult.
  4. Target20 Nov
  5. Decided3 Mar

Decided in 159 days (council typically 49)

About this application

This is a full planning application at 22 Seymour Place London W1H 7NJ. Westminster has handled 4,484 applications of this type. This one was decided in 165 days, 17 weeks longer than Westminster's typical decision time. The site is in the Portman Estate conservation area, with 15 listed buildings nearby. There are no previous applications recorded at this address. In the past year there have been 171 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.See what's approved near your address

Application details

Postcode
W1H 7NJ
Application type
Full Planning Permission Application
Scale / size
Small

Planning application dates

Date validated
25 September 2025
Consultation expiry
5 November 2025
Target decision date
20 November 2025

Applicant and agent

Agent
Monmouth Planning Ltd
Agent address
38A Monmouth Street LONDON WC2H 9EP

Planning decision

Statutory period
56 days

Publicity

Last advertised
15 October 2025
Advertisement expiry
5 November 2025
Site notice start
2 October 2025
Site notice end
23 October 2025

Additional information

Planning Portal ID
PP-14337167
Comments
0
Documents
23

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: 52, Upper Berkeley Street W1On or next to 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.

© 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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