40 Blackhorse Lane South Mimms Potters Bar Hertfordshire EN6 3PS
Approved on 11 April 2025
Council decision: Grant PermissionDelegated (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
Conversion of loft to habitable space to include rear dormer with Juliet balcony and 1 x front roof light. Construction of a single storey front and side extension to create new front porch, first floor rear extension, alterations to fenestration, and relocation of gas metre.
- Received
- 14 February 2025
- Decision level
- Delegated (officer decision)
- Public comments
- 3
- Council
- Hertsmere Borough Council
- Ward
- Shenley
- ReceivedReceived14 Feb
- ValidatedValidated14 Feb
- Consult.Consultation14 Mar
- TargetTarget Date11 Apr
- DecidedDecided11 Apr
Decided in 56 days (council typically 56)
About this application
This is a full planning application for a dormer extension at 40 Blackhorse Lane South Mimms Potters Bar Hertfordshire EN6 3PS. Hertsmere has handled 1,861 applications of this type. This one was decided in 56 days. The site is in 1 listed building nearby. There are no previous applications recorded at this address. In the past year there have been 122 applications across Shenley. We hold 3,353 applications in total for the EN6 postcode area.
90% of full applications at Hertsmere Borough Council 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
Application details
- Postcode
- EN6 3PS
- Application type
- Householder Application
- Scale / size
- Small
- Parish
- The Parish Council South Mimms And Ridge
Planning application dates
- Date validated
- 14 February 2025
- Consultation expiry
- 17 March 2025
- Consultation start
- 14 April 2025
- Consultation end
- 14 March 2025
- Neighbour consultation start
- 24 February 2025
- Neighbour consultation end
- 17 March 2025
- Last date for comments
- 17 March 2025
- Target decision date
- 11 April 2025
- Permission expires
- 11 April 2028
Applicant and agent
- Agent
- EMStudio
- Agent address
- 88 Dukes Avenue Theydon Bois Epping CM16 7HF
Planning decision
- Statutory period
- 56 days
Additional information
- Planning Portal ID
- PP-13759985
- Documents
- 11
- Constraints
- 9
Site constraints
Designations that overlap or adjoin the site outline.
- Flood zone 3: High probability (rivers and sea)Part of the site
- Green belt: Hertsmere
Not published by this council, so not checked: Article 4 directions. Ask the council if these matter.
Possibly incomplete for this council: tree preservation orders.
Also checked, none recorded (21)
flood storage areas, conservation areas, listed buildings, 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.
- 20176 Oct
Application for a non material amendment following the grant of planning permission reference 17/0377/HSE
ApprovedNon-material amendment17/1996/MA - 201724 Feb
Proposed crossover and new front drive
ApprovedHouseholder17/0377/HSE - 201621 Jun
Proposed dropped kerb.
RefusedHouseholder16/1222/HSE - 200712 Jul
*Electronic documents only, no paper fileErection of single storey rear extension.
ApprovedFull Planning PermissionTP/07/1582
Source: Hertsmere
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Around this site
Nearby applications
- 40 Blackhorse Lane South Mimms Hertfordshire EN6 3PS16/1222/HSE · FullRefused0.0 mi
- 40 Blackhorse Lane South Mimms EN6 3PSTP/07/1582 · FullApproved0.0 mi
- 40 Blackhorse Lane South Mimms Hertfordshire EN6 3PS17/0377/HSE · FullApproved0.0 mi
- 40 Blackhorse Lane South Mimms Hertfordshire EN6 3PS17/1996/MA · AmendmentApproved0.0 mi
- 38 Blackhorse Lane South Mimms Potters Bar Hertfordshire EN6 3PS22/1315/PD42 · OutlineApproved0.0 mi
For applicants and trades
Contractors near this project
Find contractors for extensions near this site- Delieu Electrical Services LtdElectrician0.0 mi
- Green Ohms Electrical Services ltdElectrician0.1 mi
- Allprop Property Maintenance LtdBuildersBathrooms0.5 mi
- Belectrix LtdElectrician0.5 mi
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.