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36 Blackhorse Lane South Mimms Potters Bar Hertfordshire EN6 3PS

23/0505/CLPCertificate Proposed Lawful Use/DevApproved
Outline / PiP

Approved on 24 May 2023

Council decision: Grant Lawful Certificate (Proposed Dev)Delegated (officer decision)

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

Conversion of loft to habitable space to include rear dormer with Juliet balcony, insertion of 3 x front roof lights and chimney stack removal. Certificate of Lawful Development (Proposed).

Received
3 April 2023
Decision level
Delegated (officer decision)
Ward
Shenley
Agent
K A Flynn Architect
  1. Received3 Apr
  2. Validated3 Apr
  3. Consult.
  4. Target29 May
  5. Decided24 May

Decided in 51 days (council typically 56)

About this application

This is an outline application for a dormer extension at 36 Blackhorse Lane South Mimms Potters Bar Hertfordshire EN6 3PS. Hertsmere has handled 952 applications of this type. This one was decided in 51 days, 5 days quicker than Hertsmere's typical decision time. The site is in 1 listed building nearby. There have been 3 other applications at this address. In the past year there have been 124 applications across Shenley. We hold 3,350 applications in total for the EN6 postcode area.

81% of outline 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.See what's approved near your address

Application details

Postcode
EN6 3PS
Application type
Certificate Proposed Lawful Use/Dev
Scale / size
Small
Parish
South Mimms Parish Council

Planning application dates

Date validated
3 April 2023
Target decision date
29 May 2023
Decision issued
25 May 2023
Permission expires
25 May 2026

Applicant and agent

Agent
K A Flynn Architect
Agent address
15 Haslemere Avenue East Barnet Hertfordshire East Barnet EN4 8EY

Planning decision

Statutory period
56 days

Additional information

Planning Portal ID
PP-12067163
Comments
0
Documents
11
Constraints
9

Site constraints

Checking the site
2/3
Council recordsAppealsFlood risk

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.

Associated applications

  1. 2023
    4 Apr

    Single storey front and side extension and alterations to fenestration.

    ApprovedHouseholderFiled alongside23/0509/HSE
  2. 2023
    3 Apr

    Conversion of loft to habitable space to include rear dormer with Juliet balcony, insertion of 3 x front roof…

    This applicationApprovedOutline23/0505/CLP
  3. 2023
    3 Apr

    Construction of a single storey rear extension. Depth: 4.74m, Height: 2.95m, Eaves: 2.60m.

    ApprovedPD- Prior Approval 42 day (Hsehold ext)Filed alongside23/0506/PD42

Source: Hertsmere

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