20 Seaforth Gardens London N21 3BS
Approved on 13 April 2026
Delegated (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
Part single storey, part two storey rear extension with juliette balcony and installation of glass balustrade to existing balcony, conversion of garage to habitable space, raised rear patio, rear dormer, front and side roof lights, side solar PV panels, replacement of rear fenestration, new side windows, repositioning and replacement of front door, installation external wall insulation to all elevations and air-source heat pump to side.
- Received
- 13 February 2026
- Decision level
- Delegated (officer decision)
- Council
- London Borough of Enfield
- Ward
- Winchmore
- Agent
- Harvey Wright Architects
- ReceivedReceived13 Feb
- ValidatedValidated20 Feb
- Consult.Consultation17 Mar
- TargetTarget Date15 Apr
- DecidedDecided13 Apr
Decided in 52 days (council typically 49)
About this application
This is a full planning application for a two storey rear extension at 20 Seaforth Gardens London N21 3BS. Enfield has handled 1,569 applications of this type. This one was decided in 59 days, 10 days longer than Enfield's typical decision time. The site is in a conservation area. There are no previous applications recorded at this address. In the past year there have been 111 applications across Winchmore. We hold 745 applications in total for the N21 postcode area.
72% of full applications at London Borough of Enfield were approved. Across all application types, the council typically decides in about 7 weeks (median).
Based on decided applications received in the last 3 years.Planning something similar? See what gets approved on your street
Application details
- Postcode
- N21 3BS
- Application type
- Householder
- Scale / size
- Small
Planning application dates
- Date validated
- 20 February 2026
- Consultation expiry
- 22 March 2026
- Consultation start
- 24 February 2026
- Consultation end
- 17 March 2026
- Neighbour consultation start
- 26 February 2026
- Neighbour consultation end
- 22 March 2026
- Last date for comments
- 22 March 2026
- Target decision date
- 15 April 2026
Applicant and agent
- Agent
- Harvey Wright Architects
- Agent address
- 156 Blackfriars Road London SE1 8EN United Kingdom
Planning decision
- Statutory period
- 54 days
Site constraints
Designations that overlap or adjoin the site outline.
- Article 4 direction: Borough wide
- Flood zone 1: Low probability (rivers and sea)
Possibly incomplete for this council: tree preservation orders.
Also checked, none recorded (22)
flood storage areas, conservation areas, listed buildings, 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: Enfield
Contains public sector information from the Planning London Datahub, licensed under the Open Government Licence v3.0.
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Find contractors for extensions near this site- Kabilo LimitedVerifiedLondonExtensionsLoft Conversions5.7 mi
- Orient Construction Consultancy LimitedVerifiedLondon6.2 mi
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Planning something similar?
See what the council approved and refused for two-storey and first-floor extensions on your street. Pick your home and get the evidence before you pay for drawings.