Basement Flat, 41 Sydney Street, London, SW3 6PX
Approved on 26 June 2026
Council decision: Grant Planning Permission/Consent5 conditions
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
Internal and external alterations including replacement of existing metal stair to front lightwell with new black painted metal stair, enclosure of open space beneath ground floor entrance stairs with new partition wall and door to form lobby entrance to Basement Flat, replacement of existing 1969 infill extension beside rear closet wing with smaller infill extension; and widening of rear lightwell to form patio and allow for the installation of new black painted metal stair to provide access/egress to Stewart's Grove.
- Received
- 9 December 2025
- Ward
- Stanley
- ReceivedReceived9 Dec
- ValidatedValidated30 Jan
- Consult.Consultation17 Apr
- TargetTarget Date27 Mar
- DecidedDecided26 Jun
Decided in 147 days (council typically 56)
About this application
This is a full planning application for an extension at Basement Flat, 41 Sydney Street, London, SW3 6PX. Kensington has handled 5,404 applications of this type. This one was decided in 199 days, 20 weeks longer than Kensington's typical decision time. The site is in the Chelsea conservation area, with 4 listed buildings nearby. There has been 1 other application at this address. In the past year there have been 185 applications across Stanley. We hold 1,788 applications in total for the SW3 postcode area.
92% of full applications at Royal Borough of Kensington and Chelsea were approved. Across all application types, the council typically decides in about 8 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
- SW3 6PX
- Application type
- Planning Permission
- Scale / size
- Medium
- Parish
- 18
- District
- Chelsea
Planning application dates
- Date validated
- 30 January 2026
- Consultation expiry
- 17 April 2026
- Consultation end
- 17 April 2026
- Target decision date
- 27 March 2026
Planning decision
- Case officer
- Ben Brockey
- Statutory period
- 108 days
Additional information
- Documents
- 20
Site constraints
Designations that overlap or adjoin the site outline.
- Conservation area: Chelsea
- Listed building: 7-67 Sydney StreetOn or next to this site
- Article 4 direction: Article 4 - No 100
- Tree Preservation OrderCovers the 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 2026-11-03. 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.
Planning history at this site
8 other applications at this property, newest first.
- 202616 Oct
Details required by condition 3 (submission of details) of listed building consent LB/26/00412
PendingDischarge of conditionsCON/26/05530 - 20262 Oct
Variation of condition 2 (compliance with approved drawings) of listed building consent LB/26/00412
PendingVariation of conditions (s73)LB/26/05048 - 20262 Oct
Variation of condition 2 (compliance with approved drawings) of planning permission PP/26/00411
PendingVariation of conditions (s73)PP/26/05047 - 20269 Mar
Internal and external alterations including replacement of existing metal stair to front lightwell with new…
ApprovedListed building consentLB/26/00394 - 202619 Jan
Construction of a mansard roof extension at third floor level, addition of a single-storey extension to the…
ApprovedAll OtherPP/26/00411 - 202619 Jan
Construction of a mansard roof extension at third floor level, addition of a single-storey extension to the…
ApprovedAll OtherLB/26/00412 - 202511 Jul
Construction of a mansard roof extension at third floor level, addition of an extension to existing closet…
WithdrawnListed building consentPP/25/04091 - 202511 Jul
Construction of a mansard roof extension at third floor level, addition of an extension toexisting closet…
WithdrawnListed building consentLB/25/04092
Source: Kensington
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
- Basement Flat, 41 Sydney Street, London, SW3 6PXLB/26/00394 · HeritageApproved0.0 mi
- 44 Sydney Street, LONDONARB/25/00710 · TreesApproved0.0 mi
- 32 Bury Street, London, SW3 6QBCON/25/06211 · ConditionsApproved0.0 mi
- 59 Sydney Street, LONDON, SW3 6PXCON/23/07707 · ConditionsApproved0.0 mi
- 33-37 Bury Walk, LONDON, SW3 6QDPP/24/05293 · FullWithdrawn0.0 mi
For applicants and trades
Contractors near this project
Find contractors for extensions near this site- Avent Roofing ServicesVerifiedWestminsterRoofing1.8 mi
- Atlas South Technical Service LimitedVerifiedLondonProperty MaintenanceHandyman2.6 mi
- Nova Coat & PlasterVerifiedStreatham, LondonRenovations & RefurbishmentsPlastering4.0 mi
- Orient Construction Consultancy LimitedVerifiedLondon5.8 mi
Planning something similar?
See what the council approved and refused for single-storey side extensions on your street. Pick your home and get the evidence before you pay for drawings.