36 Lancaster Avenue, London, Lambeth, SE27 9DZ
Refused on 17 December 2025
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
Erection of a rear dormer extension including 3 rooflights to the front, removal of existing chimney stack, replacement of front façade bay window and re-roofing and canopy covering in traditional slate.
- Submitted
- 22 October 2025
- Council
- London Borough of Lambeth
- ReceivedSubmitted22 Oct
- ValidatedValidated
- Consult.Consultation
- TargetTarget Date
- DecidedDecided17 Dec
Decided in 56 days (council typically 56)
About this application
This is a planning application for a dormer extension at 36 Lancaster Avenue London Lambeth SE27 9DZ. Lambeth has handled 50 applications of this type. This one was decided in 56 days. The site is in the Lancaster Avenue conservation area. There are no previous applications recorded at this address. In the past year there have been 26 applications across WESTDU. We hold 1,061 applications in total for the SE27 postcode area.
81% of householder planning & demolition in a conservation area applications at London Borough of Lambeth 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
Why it was refused
- The proposal by reason of its scale, design and materiality, represents an over dominant addition to the rear roofslope. In addition, the proposed removal of the existing original chimney on the flank (north-east) roofslope would erode an original feature of the Lancaster Avenue Conservation Area. The proposals would result in less than substantial harm to the character and appearance of the conservation area and there are no public London planning@lambeth.gov.uk SW2 9QQ benefits to off-set the harm. As such the proposal is contrary to policies Q5, Q11 and Q22 of the Lambeth Local Plan (2021) and paragraph 215 of the National Planning Policy Framework (2024).
From the council's decision notice.
Application details
- Postcode
- SE27 9DZ
- Application type
- Householder planning & demolition in a conservation area
Applicant and agent
- Architect profile
- DELVE ARCHITECTS LIMITED
Site constraints
Designations that overlap or adjoin the site outline.
- Conservation area: Lancaster Avenue
- Flood zone 1: Low probability (rivers and sea)
Also checked, none recorded (23)
flood storage 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 2026-11-03. 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
1 other application at this property, newest first.
Source: Lambeth
Contains public sector information from the Planning London Datahub, licensed under the Open Government Licence v3.0.
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Around this site
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- 51 Chatsworth Way London SE27 9HN24/03862/LDCP · OutlineApproved0.0 mi
- 51 Chatsworth Way London Lambeth SE27 9HN24/00239/LDCP · OutlineRefused0.0 mi
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- 31 Chatsworth Way London SE27 9HN26/00232/LDCP · OutlineApproved0.1 mi
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For applicants and trades
Contractors near this project
Find contractors for extensions near this site- Nova Coat & PlasterVerifiedStreatham, LondonRenovations & RefurbishmentsPlastering1.3 mi
- Bello Electrics LTDVerifiedElectrician3.1 mi
- Avent Roofing ServicesVerifiedWestminsterRoofing5.2 mi
- S & M Solutions Ltd | Design and Build ContractorVerifiedLondonExtensionsLoft Conversions6.1 mi
Planning something similar?
See what the council approved and refused for loft conversions and dormers on your street. Pick your home and get the evidence before you pay for drawings.