Flat 3C Block 3 Portman Mansions Chiltern Street London W1U 5AN
Approved on 7 May 2021
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
Replacement of the existing single glazed timber windows and doors with new conservation styled double glazed windows in the same configuration and style as existing at upper ground floor level.
- Received
- 24 March 2021
- Decision level
- Delegated (officer decision)
- Council
- City of Westminster
- Ward
- Marylebone High Street
- Agent
- KS Design
- ReceivedReceived24 Mar
- ValidatedValidated29 Mar
- Consult.Consultation
- TargetTarget Date24 May
- DecidedDecided7 May
Decided in 39 days (council typically 49)
About this application
This is a full planning application for window replacement at Flat 3C Block 3 Portman Mansions Chiltern Street London W1U 5AN. Westminster has handled 4,484 applications of this type. This one was decided in 44 days, 5 days quicker than Westminster's typical decision time. The site is in the Portman Estate conservation area, with 3 listed buildings nearby. There are no previous applications recorded at this address. 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
- Application for full Planning Permission
- Scale / size
- Small
Planning application dates
- Date validated
- 29 March 2021
- Consultation expiry
- 5 May 2021
- Target decision date
- 24 May 2021
Applicant and agent
- Agent
- KS Design
- Agent address
- 4 Dover Close Clacton On Sea CO15 1FX
Planning decision
- Statutory period
- 56 days
Publicity
- Last advertised
- 14 April 2021
- Advertisement expiry
- 5 May 2021
- Site notice start
- 5 April 2021
- Site notice end
- 26 April 2021
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 3A Block 3 Portman Mansions Chiltern Street London W1U 5AN24/05076/FULL · FullAwaiting decision0.0 mi
- Flat 1D Block 1 Portman Mansions Chiltern Street London W1U 5AJ25/05866/FULL · FullRefused0.0 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.