Flat 5E Block 5 Portman Mansions Chiltern Street London W1U 5AH
Approved on 29 May 2024
Council decision: Application PermittedDelegated (officer decision)
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
Installation of replacement single glazed timber frame windows and doors with new double glazed windows and doors to the front facade at second floor level.
- Received
- 28 March 2024
- Decision level
- Delegated (officer decision)
- Council
- City of Westminster
- Ward
- Marylebone
- Agent
- IL Architecture
- ReceivedReceived28 Mar
- ValidatedValidated11 Apr
- Consult.Consultation
- TargetTarget Date6 Jun
- DecidedDecided29 May
Decided in 48 days (council typically 49)
About this application
This is a full planning application for window replacement at Flat 5E Block 5 Portman Mansions Chiltern Street London W1U 5AH. Westminster has handled 4,484 applications of this type. This one was decided in 62 days, 13 days longer than Westminster's typical decision time. The site is in the Portman Estate conservation area, with 2 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 1,068 applications in total for the W1U 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
- W1U 5AH
- Application type
- Full Planning Permission Application
- Scale / size
- Small
Planning application dates
- Date validated
- 11 April 2024
- Consultation expiry
- 22 May 2024
- Target decision date
- 6 June 2024
Applicant and agent
- Agent
- IL Architecture
- Architect profile
- IL ARCHITECTURE LTD
- Agent address
- Flat 2, 8 Brechin Place London SW74QA United Kingdom
Planning decision
- Statutory period
- 56 days
Publicity
- Last advertised
- 1 May 2024
- Advertisement expiry
- 22 May 2024
- Site notice start
- 24 April 2024
- Site notice end
- 15 May 2024
Site constraints
Designations that overlap or adjoin the site outline.
- Conservation area: Portman EstatePart of the 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 (22)
flood storage areas, listed buildings, 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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