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31, Sefton Avenue, Mill Hill, NW7 3QB

25/5113/NMANon-Material AmendmentApproved
Discharge / amendments

Approved on 5 January 2026

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

Non material amendment to planning permission 25/3239/HSE dated 01/10/2025 for 'First floor side extension. Roof extension involving hip to gable, rear dormer with glass balustrade for the juliette balcony and 3no. front facing rooflights. Changes to roof tiles and fenestration' Amendments includes removal of existing chimney and adjustment to front facing rooflights

Submitted
19 December 2025
  1. Received19 Dec
  2. Validated
  3. Consult.
  4. Target
  5. Decided5 Jan

Decided in 17 days (council typically 56)

About this application

This is a planning application for a dormer extension at 31, Sefton Avenue, Mill Hill, NW7 3QB. Barnet has handled 107 applications of this type. This one was decided in 17 days, 6 weeks quicker than Barnet's typical decision time. There are no previous applications recorded at this address. In the past year there have been 95 applications across EW22. We hold 1,044 applications in total for the NW7 postcode area.

84% of non-material amendment 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

Application details

Postcode
NW7 3QB
Application type
Non-Material Amendment

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.

Associated applications

  1. 2025
    19 Dec

    Non material amendment to planning permission 25/3239/HSE

    This applicationApprovedNon-material amendment25/5113/NMA
  2. 2025
    4 Aug

    First floor side extension. Roof extension involving hip to gable, rear dormer with glass balustrade for the…

    ApprovedHouseholderPart of25/3239/HSE

Source: Barnet

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

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