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8 Allandale Avenue London N3 3PJ

26/2165/HSEHouseholder ApplicationRefused
Householder

Refused on 12 August 2026

Council decision: RefuseDelegated (officer decision)2 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

Single storey rear extension and pergola. Alterations to the existing terrace area. Changes to rear fenestration

Received
10 June 2026
Decision level
Delegated (officer decision)
Ward
Finchley Church End
Agent
Trevor Brown Architect
  1. Received10 Jun
  2. Validated18 Jun
  3. Consult.
  4. Target13 Aug
  5. Decided12 Aug

Decided in 55 days (council typically 56)

About this application

This is a full planning application for a single storey rear extension at 8 Allandale Avenue London N3 3PJ. Barnet has handled 4,516 applications of this type. This one was decided in 63 days, 7 days longer than Barnet's typical decision time. There has been 1 other application at this address. In the past year there have been 144 applications across Finchley Church End. We hold 1,017 applications in total for the N3 postcode area.

77% of full applications at London Borough of Barnet 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 rear extension, by reason of its cumulative excessive scale, depth, siting would cause a loss of outlook and privacy and an increased sense of enclosure towards 6 Allandale Avenue. The proposed development would therefore be detrimental to the amenities of the occupiers of the neighbouring property, contrary to Policy D3 of the London Plan (2021), Policies CDH01 and CDH05 of the Adopted Barnet Local Plan (2025) and the Sustainable Design and Development Guidance Supplementary Planning Document (2026).
  2. The proposal, by reason of its cumulative depth, size, scale, design and siting, would result in an incongruous form of development, appearing out of scale with the host dwellinghouse, and at odds with the established pattern of development in the surrounding area, contrary to Policy D3 of the London Plan (2021), Policies CDH01 and CDH05 of the LB Barnet Local Plan (2025) and the Sustainable Design and Development Guidance Supplementary Planning Document (2026).

From the council's decision notice.

Application details

Postcode
N3 3PJ
Application type
Householder Application
Scale / size
Small

Planning application dates

Date validated
18 June 2026
Consultation expiry
16 July 2026
Target decision date
13 August 2026

Applicant and agent

Agent
Trevor Brown Architect
Architect profile
TREVOR BROWN ARCHITECT LTD
Agent address
Greenside House 50 Station Road London N22 7DE

Planning decision

Statutory period
56 days

Publicity

Site notice start
25 June 2026
Site notice end
16 July 2026

Additional information

Planning Portal ID
PP-14995927
Comments
0
Documents
8

Site constraints

Checking the site
2/3
Council recordsAppealsFlood risk

Designations that overlap or adjoin the site outline.

  • Article 4 direction: Article 4 Small Houses in Multiple Occupation (HMO) Area 1
  • 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: Barnet

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

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