3 Northumberland Place London W2 5BS
Proposal
Confirmation that the planning permission dated 19 June 2025 (RN: 25/01772/FULL) for the: Erection of a mansard roof extension to a five storey terraced house and installation of solar panels at roof, Namely confirmation that the proposed installation of one air source heat pump on the flat roof of the rear outrigger is permitted development under Class G, Part 14, Schedule 2 of the Town and Country Planning (General Permitted Development) (England) Order 2015 (as amended) (the GPDO), and would therefore be lawful if carried out.
- Received
- 25 September 2026
- Public comments
- 0 · last counted 15 October 2026
- Council
- City of Westminster
- ReceivedSubmitted25 Sep
- ValidatedValidated25 Sep
- Consult.Consultation
- TargetTarget Date
- DecidedDecided
This is a planning application for an extension at 3 Northumberland Place London W2 5BS. Westminster has handled 26,489 applications of this type and approves 88% of them, typically deciding them in 54 days. It was submitted on 25 September 2026 and is still awaiting a decision. The site is in the Westbourne conservation area, with 1 listed building nearby. There have been 4 other applications at this address. We hold 3,323 applications in total for the W2 postcode area.
Application Details
Applicant & Agent
Planning Application Dates
Planning Decision
Publicity
Appeal
Additional Information
Source: Westminster
Contains public sector information from the Planning London Datahub, licensed under the Open Government Licence v3.0.
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Associated applications
- 202625 Sep
Confirmation that the planning permission dated 19 June 2025 (RN: 25/01772/FULL
This applicationPendingApplication26/06481/CLOPUD - 20266 May
Variation of condition 1 of planning permission dated 19th June 2025 (RN:25/01772/FULL
PendingVariation of conditions (s73)26/02986/FULL - 202517 Oct
Detailed drawings showing the revised detailed design of dormers, to include slimmer cheeks and roof…
ApprovedApplicationRelated25/07540/ADFULL - 202524 Mar
Erection of a mansard roof extension to a five storey terraced house and installation of solar panels at roof.
ApprovedHouseholderPart of25/01772/FULL
Planning history at this site
4 other applications at this property, newest first.
- 202625 Aug
Painting of the front facade of the building.
ApprovedApplication26/05560/CLOPUD - 202610 Feb
T1 1 x Magnolia fell
Decision deferred - Only for Trees useApplication26/00800/TCA - 202517 Oct
Detailed drawings of new railings, new bin store, new lightwell porch, method statement explaining the…
ApprovedDischarge of conditions25/07538/ADFULL - 202519 May
1 x Cotoneaster: fell
No Objection to Proposal (OBS only)Application25/03383/TCA
Planning constraints
Designations that overlap or adjoin the site outline.
- Conservation area: Westbourne
- Article 4 direction: Article 4 Basement Development Permitted Rights Removed
- Tree Preservation Order: Ref W438Protected tree on or next to this site
- Flood zone 1: Low probability (rivers and sea)
Also checked, none recorded (21)
flood storage areas, listed buildings, 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 2026-10-09. 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.
Before the decision
You may need a tree survey and arboricultural impact assessment. Arboriculturists near this site
Protected trees (TPO) are on or next to this site.
- 1.9 miLONDONRTPI
- 2.0 miLondonRTPI
- 2.3 miLondonRTPI
Nearest first, within 25 miles of the site. Every firm is listed free.
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