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32 Aston Avenue, Harrow, HA3 0DB

26/1126HouseholderRefused

Refused on 7 August 2026

Council decision: Permission RefusedDelegated (officer decision)3 reasons 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

Proposed single storey side infill extension, creation of basement level, hip to gable extension, rear and side dormer windows with 2x juliet balconies, installation of window to side roof slope and installation of solar panels to the outbuilding roof of the dwellinghouse.

Received
5 May 2026
Decision level
Delegated (officer decision)
Public comments
1
Ward
Kenton
Agent
Planning By Design
  1. Received5 May
  2. Validated12 Jun
  3. Consult.25 Aug
  4. Target
  5. Decided7 Aug

Decided in 56 days (council typically 56)

About this application

This is a full planning application for a dormer extension at 32 Aston Avenue, Harrow, HA3 0DB. Brent has handled 4,396 applications of this type. This one was decided in 94 days, 5 weeks longer than Brent's typical decision time. The site is in a conservation area. There are no previous applications recorded at this address. In the past year there have been 163 applications across Kenton. We hold 5,584 applications in total for the HA3 postcode area.

77% of full applications at London Borough of Brent 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 basement, by reason of its excessive scale, footprint and projection approximately 8.6m beyond the rear elevation of the host dwelling into the rear garden, would fail to remain subordinate to the host dwelling and would result in an excessive form of basement development. The proposal would significantly exceed the guidance contained within the Council's adopted Basement Supplementary Planning Document (2017). Furthermore, insufficient information has been provided to fully demonstrate the extent of excavation associated with the proposed swimming pool structure. The proposal is therefore contrary to Policy DMP1 of the Brent Local Plan and the adopted Brent Basement Supplementary Planning Document.
  2. The proposed roof alterations, including the elevated photovoltaic panels, would create an unduly bulky and visually dominant roof form that would fail to appear subordinate to the host dwelling and would harm the character and appearance of the dwelling and surrounding street scene, contrary to Policy DMP1 of the Brent Local Plan and Brent's Residential Extensions and Alterations Supplementary Planning Document.
  3. The proposed photovoltaic panels, by reason of their number, siting, inclination and projection approximately 0.6m above the roof of the existing outbuilding, would result in an unduly prominent and visually intrusive form of development. The proposal would fail to appear as a discreet addition and would detract from the character and appearance of the host property and its rear garden setting. The development is therefore contrary to Policy DMP1 of the Brent Local Plan and the guidance contained within Brent's Residential Extensions and Alterations Supplementary Planning Document.

From the council's decision notice.

Application details

Postcode
HA3 0DB
Application type
Householder
Scale / size
Small

Planning application dates

Date validated
12 June 2026
Consultation expiry
25 August 2026
Neighbour consultation end
25 August 2026
Last date for comments
7 August 2026

Applicant and agent

Agent
Planning By Design
Architect profile
PLANNING BY DESIGN LTD
Agent address
167-169 Great Portland Street, London, W1W 5PF

Additional information

Planning Portal ID
PP-14898768
Documents
29

Site constraints

Checking the site
2/3
Council recordsAppealsFlood risk

Designations that overlap or adjoin the site outline.

  • Article 4 direction: Article 4 for HMOs
  • Flood zone 1: Low probability (rivers and sea)
Also checked, none recorded (23)

flood storage areas, conservation areas, listed buildings, 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: Brent

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

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