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74 Thurlow Hill London SE21 8JN

26/02151/FULRefused

Refused on 11 November 2026

1 reason for refusal

Approximate site (title boundary)
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 single storey ground floor rear and front side infill extension and a first floor side extension - Retrospective.

Received
23 July 2026
Public comments
0 · last counted 5 November 2026
Ward
West Dulwich
  1. Received23 Jul
  2. Validated23 Jul
  3. Consult.
  4. Target
  5. Decided11 Nov

Decided in 111 days

About this application

This is a planning application for a side extension at 74 Thurlow Hill London SE21 8JN. Lambeth has handled 15,936 applications of this type. This one was decided in 111 days, 8 weeks longer than Lambeth's typical decision time. There are no previous applications recorded at this address. In the past year there have been 52 applications across West Dulwich. We hold 1,059 applications in total for the SE21 postcode area.

Why it was refused

  1. The proposed development, by reason of its cumulative scale, bulk and massing, when considered alongside the ground-floor side extension and existing rear dormer, would result in a disproportionate addition to the host dwelling. The proposal would disrupt the established architectural balance and cohesive composition of the distinctive semi-detached pair, undermining the proportions and character of the host dwelling and resulting in an incongruous form of development within the street scene. The proposal would therefore be contrary to Policies Q5 and Q11 of the Lambeth Local Plan (2021) and the guidance contained within the Lambeth Design Guide Supplementary Planning Document (2023), particularly paragraph 4.69. London planning@lambeth.gov.uk SW2 9QQ

From the council's decision notice.

Application details

Postcode
SE21 8JN

Planning application dates

Date validated
23 July 2026

Applicant and agent

Applicant
Private applicant

Planning decision

Case officer
Sabelle Adjagboni

Additional information

Documents
7

Site constraints

Checking the site
2/3
Council recordsAppealsFlood risk

Designations that overlap or adjoin the site outline.

  • Flood zone 1: Low 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 2026-11-03. 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.

Source: Lambeth

Contains public sector information from the Planning London Datahub, licensed under the Open Government Licence v3.0.

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