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134 - 136 Seymour Place London W1H 1NT

25/05437/CLEUDCertificate of Lawfulness (existing)Approved
Lawful development certificate

Approved on 21 October 2025

Council decision: Application PermittedDelegated (officer decision)

Approximate site (title boundary)
Boundary © HM Land Registry, © Ordnance Survey · details

This information is subject to Crown copyright and database rights 2026 and is reproduced with the permission of HM Land Registry. The polygons (including the associated geometry, namely x, y co-ordinates) are subject to Crown copyright and database rights 2026 Ordnance Survey AC0000851063. Conditions of use.

Proposal

Confirmation that the current use of the building falls within Class E of the Town and Country Planning (Use Classes) Order 1987 (as amended) is lawful.

Received
4 August 2025
Decision level
Delegated (officer decision)
Ward
Marylebone
Agent
Kore Planning
  1. Received4 Aug
  2. Validated4 Aug
  3. Consult.
  4. Target29 Sep
  5. Decided21 Oct

Decided in 78 days (council typically 49)

About this application

This is an application to amend a permission at 134 - 136 Seymour Place London W1H 1NT. Westminster has handled 604 applications of this type. This one was decided in 78 days, 4 weeks longer than Westminster's typical decision time. The site is in the Portman Estate conservation area, with 12 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.

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.See what's approved near your address

Application details

Postcode
W1H 1NT
Application type
Certificate of Lawfulness (existing)
Scale / size
Small

Planning application dates

Date validated
4 August 2025
Target decision date
29 September 2025

Applicant and agent

Agent
Kore Planning
Agent address
124 City Road London EC1V 2NX United Kingdom

Planning decision

Statutory period
56 days

Additional information

Planning Portal ID
PP-13854958
Comments
0
Documents
13

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: Walmer HouseOn this site
  • Article 4 direction: Article 4 Basement Development Permitted Rights Removed
  • 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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