37 Cornwall Avenue London N3 1LG
Refused on 1 July 2025
Council decision: UnlawfulDelegated (officer decision)
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 with rear dormer windows with 4no. front facing rooflights. Front porch infill
- Received
- 16 June 2025
- Decision level
- Delegated (officer decision)
- Council
- London Borough of Barnet
- Ward
- West Finchley
- Agent
- G2 Architecture
- ReceivedReceived16 Jun
- ValidatedValidated16 Jun
- Consult.Consultation
- TargetTarget Date11 Aug
- DecidedDecided1 Jul
Decided in 15 days (council typically 56)
About this application
This is an outline application for a dormer extension at 37 Cornwall Avenue London N3 1LG. Barnet has handled 2,167 applications of this type. This one was decided in 15 days, 6 weeks quicker than Barnet's typical decision time. There has been 1 other application at this address. In the past year there have been 103 applications across West Finchley. We hold 1,017 applications in total for the N3 postcode area.
75% of outline 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
- N3 1LG
- Application type
- Proposed Lawful Development Certificate
- Scale / size
- Small
Planning application dates
- Date validated
- 16 June 2025
- Target decision date
- 11 August 2025
Applicant and agent
- Agent
- G2 Architecture
- Architect profile
- G2 ARCHITECTURE LIMITED
- Agent address
- Office 3 Broadmeads Pumping Station Hertford Road Ware SG12 9LH
Planning decision
- Statutory period
- 56 days
Site constraints
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.
Planning history at this site
4 other applications at this property, newest first.
- 202612 Mar
Single storey rear extension following demolition of the existing sun room. Roof extension involving rear…
ApprovedHouseholder26/0945/HSE - 202517 Nov
Conversion of the existing dwelling into 2no. self-contained flats including single storey rear extension…
RefusedFull planning permission25/4558/FUL - 202515 Jul
1581 - 37 Cornwall Avenue, N3 1LG - LOFT
ApprovedLawful development: Proposed use25/2989/192 - 202517 Jun
Single storey rear extension with a proposed depth of 6.00 metres, maximum height of 3.38 metres and eaves…
WithdrawnPrior Approval: Larger Home Extension25/2499/PNH
Source: Barnet
Contains public sector information from the Planning London Datahub, licensed under the Open Government Licence v3.0.
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Around this site
Nearby applications
- 37 Cornwall Avenue London N3 1LG26/0945/HSE · FullApproved0.0 mi
- 39 Cornwall Avenue London N3 1LG25/5142/192 · OutlineApproved0.0 mi
- 39 Cornwall Avenue London N3 1LG26/3192/HSE · FullApproved0.0 mi
- 39 Cornwall Avenue London N3 1LG25/3818/HSE · FullApproved0.0 mi
- S/O 37 Wentworth Park On Wentworth Avenue London N3 1YE24/4988/LICApproved0.0 mi
For applicants and trades
Contractors near this project
Find contractors for extensions near this site- Atlas South Technical Service LimitedVerifiedLondonProperty MaintenanceHandyman6.1 mi
- Orient Construction Consultancy LimitedVerifiedLondon6.5 mi
- Avent Roofing ServicesVerifiedWestminsterRoofing7.0 mi
- Kabilo LimitedVerifiedLondonExtensionsLoft Conversions8.2 mi
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