40 Strathnairn Street London Southwark SE1 5BL
Proposal
Certificate of lawfulness (proposed) for the erection of a single storey rear extension and the conversion and extension of the existing loft space at 40 Strathnairn Street, London, SE1 5BL, forming part of a two-storey mid-terraced dwellinghouse, under permitted development. The works include the formation of a single storey rear extension at ground floor level and a rear dormer extension to the existing roof. The loft conversion will provide an additional en-suite bedroom, including a shower room, storage/wardrobe space, and a new staircase connecting the first floor to the proposed loft level. The additional accommodation at both ground and loft levels will form an integral part of the existing single dwellinghouse and will be used by the occupants of the property.
- Received
- 19 May 2026
- Decided
- 4 August 2026
- Council
- London Borough of Southwark
- Ward
- South Bermondsey
- ReceivedSubmitted19 May
- ValidatedValidated19 May
- Consult.Consultation
- TargetTarget Date13 Jul
- DecidedDecided4 Aug
Decided in 77 days (council typically 49)
This is an outline application for a single storey rear extension at 40 Strathnairn Street London Southwark SE1 5BL. Southwark has handled 202 applications of this type and approves 94% of them, typically deciding them in 49 days. This one was decided in 77 days, 4 weeks longer than Southwark's median. There has been 1 other application at this address. In the past year there have been 64 applications across South Bermondsey. We hold 2,143 applications in total for the SE1 postcode area.
Application Details
Applicant & Agent
Source: Southwark
Contains public sector information from the Planning London Datahub, licensed under the Open Government Licence v3.0.
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Planning history at this site
1 other application at this property, newest first.
Planning constraints
Designations that overlap or adjoin the site outline.
- Flood zone 3: High probability (rivers and sea)
Also checked, none recorded (24)
flood storage areas, conservation areas, listed buildings, Article 4 directions, 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 2026-10-09. 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.
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