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149 Montrose Avenue Edgware HA8 0DZ

26/2119/HSEHouseholder ApplicationRefused
Householder

Refused on 31 July 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

Roof extension involving hip to gable, rear dormer window and 2no. front facing rooflights. Insertion of new first floor window to flank elevation. Removal of pebble dash rendering in favour of brick. Removal of front boundary wall. Removal of front dish antenna. (Part Retrospective) (AMENDED DESCRIPTION AND DRAWINGS).

Received
8 June 2026
Ward
Burnt Oak
  1. Received8 Jun
  2. Validated8 Jun
  3. Consult.
  4. Target3 Aug
  5. Decided31 Jul

Decided in 53 days (council typically 56)

About this application

This is a full planning application for a dormer extension at 149 Montrose Avenue Edgware HA8 0DZ. Barnet has handled 4,516 applications of this type. This one was decided in 53 days, 3 days quicker than Barnet's typical decision time. The site is in the Watling Estate conservation area. There have been 2 other applications at this address. In the past year there have been 57 applications across Burnt Oak. We hold 1,451 applications in total for the HA8 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.Planning something similar? See what gets approved on your street

Why it was refused

  1. The proposed development, by reason of the scale, design, siting and unbalancing effect of the roof extensions, would result in a disproportionate and unsympathetic addition that would introduce an incongruous form of development detrimental to the uniformity of the established roof scape and pattern of development and which would fail to preserve or enhance the character and appearance of the host property and the designated Watling Estate Conservation Area, resulting in less than substantial harm against which no public benefit has been identified, contrary to Section 16 of the National Planning Policy Framework (2024) as amended, Policies D3 and HC1 of the London Plan (2021), Policies CDH01, CDH05, and CDH08 of the LB Barnet Local Plan (2025) and the Sustainable Design and Development Guidance SPD (2026)

From the council's decision notice.

Application details

Postcode
HA8 0DZ
Application type
Householder Application
Scale / size
Small

Planning application dates

Date validated
8 June 2026
Consultation expiry
9 July 2026
Target decision date
3 August 2026

Applicant and agent

Agent address
39 Wellesley Crescent Potters Bar EN6 2DQ

Planning decision

Statutory period
56 days

Publicity

Last advertised
18 June 2026
Advertisement expiry
9 July 2026
Site notice start
18 June 2026
Site notice end
9 July 2026

Additional information

Planning Portal ID
PP-14991204
Comments
0
Documents
4

Site constraints

Checking the site
2/3
Council recordsAppealsFlood risk

Designations that overlap or adjoin the site outline.

  • Conservation area: The Watling Estate
  • 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 (22)

flood storage 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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