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18 Seymour Street London W1H 7HU

24/01715/NMANon-material amendmentsApproved
Discharge / amendments

Approved on 29 May 2024

Council decision: Application PermittedDelegated (officer decision)

Approximate location: the centre of the postcode, not the exact property.

Proposal

Amendments to planning permission dated 08 August 2023 (RN: 23/02366/FULL) for, 'Installation of 4 x heat pump units and photovoltaic panels at roof level, single storey extension to rear ground floor, re-construction of existing wc closet extension at mid first/second floor level, replacement of existing window sashes with double glazed timber sashes, external repairs to building and associated works, all in connection with continued office use'; Namely, relocation of WC use within the reconstructed closet extension at mid first/second floor level, to the comfort facilities located on the third floor, change the use of reconstructed closet extension from WC to office, rearranging the layout of comfort facilities at third floor, and removing direct access between the office and comfort facilities and incorporating WC from closet extension into comfort facilties at thrid floor a relocate tea point into the office space. (Linked 24/02207/LBC)

Received
15 March 2024
Decision level
Delegated (officer decision)
Ward
Marylebone
Agent
Latitude Architects
  1. Received15 Mar
  2. Validated25 Mar
  3. Consult.
  4. Target22 Apr
  5. Decided29 May

Decided in 65 days (council typically 49)

About this application

This is an application to amend a permission at 18 Seymour Street London W1H 7HU. Westminster has handled 604 applications of this type. This one was decided in 75 days, 4 weeks longer than Westminster's typical decision time. The site is in the Portman Estate conservation area, with 13 listed buildings nearby. There have been 6 other applications at this address. 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 7HU
Application type
Non-material amendments
Scale / size
Small

Planning application dates

Date validated
25 March 2024
Target decision date
22 April 2024

Applicant and agent

Agent
Latitude Architects
Agent address
15 Weller Street London SE1 1QU United Kingdom

Planning decision

Statutory period
28 days

Additional information

Planning Portal ID
PP-12890853
Comments
0
Documents
15

Site constraints

Checking the site
2/3
Council recordsAppealsFlood risk

Designations at the address point. Ones next to the site may also apply.

  • Conservation area: Portman Estate
  • Listed building: Grade II: 1, New Quebec Street W1On or next to this site · +1 more
  • 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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