1 Chiltern Street London W1U 7PA
Approved on 17 September 2026
Proposal
Infill of arrow slit window in north gable; conversion of existing fanlight to louvres; modifications to doors; amalgamation of bedrooms 17 & 18; and function room to north-east corner of basement. (Linked with 26/05305/NMA)
- Received
- 12 August 2026
- Council
- City of Westminster
- ReceivedReceived12 Aug
- ValidatedValidated12 Aug
- Consult.Consultation
- TargetTarget Date
- DecidedDecided17 Sep
Decided in 36 days
About this application
This is a planning application for window replacement at 1 Chiltern Street London W1U 7PA. Westminster has handled 27,108 applications of this type. This one was decided in 36 days, 13 days quicker than Westminster's typical decision time. The site is in the Portman Estate conservation area, with 14 listed buildings nearby. There have been 6 other applications at this address. We hold 1,070 applications in total for the W1U postcode area.
Application details
- Postcode
- W1U 7PA
Planning application dates
- Date validated
- 12 August 2026
Site constraints
Designations that overlap or adjoin the site outline.
- Conservation area: Portman Estate
- Article 4 direction: Article 4 Basement Development Permitted Rights Removed+1 more
- 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.
Associated applications
- 202614 Aug
Replacement of rooftop plant and associated screening, switched kitchen extract/supplies, new access hatch to…
PendingApplicationFiled alongside26/05544/FULL - 202614 Aug
Replacement of rooftop plant and associated screening, switched kitchen extract/supplies, new access hatch to…
PendingListed building consentFiled alongside26/05545/LBC - 202612 Aug
Amendments to planning permission dated 28th February 2025 (RN: 23/02315/FULL
ApprovedNon-material amendmentPart of26/05305/NMA - 202612 Aug
Infill of arrow slit window in north gable; conversion of existing fanlight to louvres; modifications to…
This applicationApprovedListed building consent26/05485/LBC - 202611 Aug
Minor internal structural repairs to cracked walls at First Floor (Level 1) and Second Floor (Level 2).
ApprovedListed building consentFiled alongside26/05300/LBC
Planning history at this site
5 other applications at this property, newest first.
- 202616 Oct
Minor internal alterations
PendingListed building consent26/07114/LBC - 202616 Jun
Alterations to steelwork at fourth floor level.
ApprovedListed building consent26/03972/LBC - 202618 Mar
Removal of areas of fire and water damaged plasterwork internally. Temporary removal of laths at third floor…
ApprovedListed building consent26/01760/LBC - 202523 Jul
Reinstatement of roof structure, roof finishes and plant following fire on 14.02.25
ApprovedListed building consent25/05136/LBC - 202510 Jul
Removal and replacement of all remaining pugging to 1st and 2nd floor soffits to facilitate the drying out of…
ApprovedListed building consent25/04762/LBC
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
- 1 Chiltern Street London W1U 7PA26/01760/LBC · HeritageApproved0.0 mi
- 41 Manchester Street London W1U 7LN26/01966/ADLBC · ConditionsRefused0.0 mi
- 41 Manchester Street London W1U 7LN26/01813/ADLBC · ConditionsRefused0.0 mi
- Ground Floor 32 Chiltern Street London W1U 7QQ26/00867/ADV · AdvertisingApproved0.0 mi
- 44 Manchester Street London W1U 7LR24/04921/LBC · HeritageAwaiting decision0.0 mi
For applicants and trades
Contractors near this project
Find contractors for renovations & refurbishments near this site- Atlas South Technical Service LimitedVerifiedLondonProperty MaintenanceHandyman0.7 mi
- Avent Roofing ServicesVerifiedWestminsterRoofing0.9 mi
- Orient Construction Consultancy LimitedVerifiedLondon4.1 mi
- Nova Coat & PlasterVerifiedStreatham, LondonRenovations & RefurbishmentsPlastering5.6 mi
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