Skip to content

28, Trouville Road, London, SW4 8QL

25/02293/FULFull planning permissionRefused
Full

Refused on 8 October 2025

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

This proposal relates to the second-floor flat at 28 Trouville Road, a converted mid-terrace residential property. The building already features a rear-facing dormer at the main roof level. The applicant proposes to construct a new rear mansard dormer extension, designed to connect with the existing main dormer, but set significantly below it to ensure visual subordination and design harmony. The new dormer will have a mansard roof form with a 70-degree pitch, in accordance with Lambeth’s design guidance, and will be finished in matching tiles to retain visual continuity with the host roof. Two side windows will be incorporated into the dormer, and these can be obscured up to 1.7 metres to preserve neighbouring amenity and privacy. The extension will create approximately 10.13 square metres of internal floorspace, to be used as a home study by the occupant. The works will not alter the footprint of the building and will respect the external fabric and character of the host property.

Submitted
13 August 2025
  1. Received13 Aug
  2. Validated
  3. Consult.
  4. Target
  5. Decided8 Oct

Decided in 56 days (council typically 56)

About this application

This is a planning application for a dormer extension at 28, Trouville Road, London, SW4 8QL. Lambeth has handled 719 applications of this type. This one was decided in 56 days. There are no previous applications recorded at this address. In the past year there have been 21 applications across CLCOMM. We hold 2,293 applications in total for the SW4 postcode area.

80% of full planning permission 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.See what's approved near your address

Why it was refused

  1. The proposed mansard to rear outrigger by reason of its siting, design, form and scale together with the existing dormer would result in a bulky and incongruous addition that fails to achieve subordination. Furthermore, the side elongated windows are inappropriate and neither appear subordinate or modest due to their siting and size. The proposal would thereby fail to positively respond to the character and appearance of the host building and the distinct and generally uniform roofscape of the locality, which is contrary to Policies Q2, Q5, Q8 and Q11 of the Lambeth Local Plan 2021 and the Lambeth Design Guide 2023. London planning@lambeth.gov.uk SW2 9QQ

From the council's decision notice.

Application details

Postcode
SW4 8QL
Application type
Full planning permission

Applicant and agent

Architect profile
ARM DESIGN & BUILD LIMITED

Site constraints

Checking the site
2/3
Council recordsAppealsFlood risk

Designations that overlap or adjoin the site outline.

  • Conservation area: Oaklands EstateNext to the site
  • 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.

Source: Lambeth

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

Track this application

Get email alerts when there is a planning decision or status change.

Get email alerts near SW4

New planning applications delivered to your inbox daily.

Around this site

Discuss this application on r/PlanningPermissionUK

For applicants and trades

What's been approved on your street?

See what the council approved and refused near this address for the project you have in mind, and the rules that apply here.

Get The Signal Report