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3, Oakleigh Park South, London, N20 9JS

26/1148/HSEHouseholder planning permissionRefused
Householder

Refused on 21 May 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

Proposed single storey rear extension, alterations to fenestration and installation of double width garage door to return garage to original use

Submitted
26 March 2026
  1. Received26 Mar
  2. Validated
  3. Consult.
  4. Target
  5. Decided21 May

Decided in 56 days (council typically 56)

About this application

This is a planning application for a single storey rear extension at 3, Oakleigh Park South, London, N20 9JS. Barnet has handled 1,187 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 62 applications across WS22. We hold 929 applications in total for the N20 postcode area.

82% of householder planning permission 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 single storey rear extension, by reason of its size, scale and excessive depth, would appear as a disproportionate and unsympathetic form of development that would relate poorly to the existing property and would be harmful to the character, appearance and significance of the locally listed building, contrary to Policies D3 and HC1 of the London Plan (2021); Policies CDH01, CDH05 and CDH08 of Barnet's Local Plan (adopted March 2025) and the Residential Design Guidance SPD (2016).

From the council's decision notice.

Application details

Postcode
N20 9JS
Application type
Householder planning permission

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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