Flat 3A Block 3 Portman Mansions Chiltern Street London W1U 5AN
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
Proposed replacement of the existing single-glazed casement and sash windows with slimline double glazed windows in the same configuration and style as existing
- Received
- 25 July 2024
- Decision due
- 19 September 2024
- Council
- City of Westminster
- Ward
- Marylebone
- Agent
- IMAGE Architecture
- ReceivedReceived25 Jul
- ValidatedValidated25 Jul
- Consult.Consultation
- TargetTarget Date19 Sep
- DecidedDecided
Have your say
About this application
This is a full planning application for window replacement at Flat 3A Block 3 Portman Mansions Chiltern Street London W1U 5AN. Westminster has handled 4,484 applications of this type. It has been with the council since 25 July 2024 and is still awaiting a decision. The site is in the Portman Estate conservation area, with 3 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 1,070 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.Planning something similar? See what gets approved on your street
Application details
- Postcode
- W1U 5AN
- Application type
- Full Planning Permission Application
- Scale / size
- Small
Planning application dates
- Date validated
- 25 July 2024
Applicant and agent
- Agent
- IMAGE Architecture
- Architect profile
- IMAGE ARCHITECTURE LIMITED
- Agent address
- 86 North End Road London NW11 7SY United Kingdom
Planning decision
- Statutory period
- 56 days
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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Around this site
Nearby applications
- Flat 1D Block 1 Portman Mansions Chiltern Street London W1U 5AJ25/05866/FULL · FullRefused0.0 mi
- Flat 3C Block 3 Portman Mansions Chiltern Street London W1U 5AN21/01891/FULL · FullApproved0.0 mi
- Flat 5E Block 5 Portman Mansions Chiltern Street London W1U 5AH24/02042/FULL · FullApproved0.0 mi
- Romney Mews London18/03593/FULL · FullApproved0.0 mi
- Romney Mews London18/00575/ADFULL · ConditionsApproved0.0 mi
For applicants and trades
Contractors near this project
Find contractors for windows & doors near this site- Atlas South Technical Service LimitedVerifiedLondonProperty MaintenanceHandyman0.7 mi
- Avent Roofing ServicesVerifiedWestminsterRoofing1.1 mi
- Orient Construction Consultancy LimitedVerifiedLondon4.0 mi
- Nova Coat & PlasterVerifiedStreatham, LondonRenovations & RefurbishmentsPlastering5.9 mi
Planning something similar?
See what the council approved and refused for window and door replacements on your street. Pick your home and get the evidence before you pay for drawings.