171 Mutton Lane Potters Bar Hertfordshire EN6 2AN
Refused on 12 October 2026
Council decision: Refuse to Grant Certificate1 reason for refusal
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
Retention of existing self-contained residential outbuilding / dwelling Certificate of Lawful Development (Existing).
- Received
- 5 May 2026
- Public comments
- 4 · last counted 4 November 2026
- Council
- Hertsmere Borough Council
- Ward
- Potters Bar Furzefield
- Agent
- UPP Architects + Town Planners
- ReceivedReceived5 May
- ValidatedValidated5 Jun
- Consult.Consultation29 Jun
- TargetTarget Date14 Aug
- DecidedDecided12 Oct
Decided in 129 days (council typically 56)
About this application
This is an application to amend a permission at 171 Mutton Lane Potters Bar Hertfordshire EN6 2AN. Hertsmere has handled 181 applications of this type. This one was decided in 160 days, 15 weeks longer than Hertsmere's typical decision time. There has been 1 other application at this address. In the past year there have been 96 applications across Potters Bar Furzefield. We hold 3,350 applications in total for the EN6 postcode area.
77% of amendment 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
Why it was refused
- The evidence submitted, including the statutory declarations, utility records, Council Tax documentation and planning history, indicates that during a substantial part of the relevant period the outbuilding was occupied by a member of the ownership family and remained functionally associated with the main dwellinghouse. The evidence is therefore more consistent with the use of the outbuilding as ancillary residential accommodation associated with the host dwellinghouse than as a separate self-contained dwellinghouse. The Local Planning Authority is not satisfied, on the balance of probabilities, that the outbuilding was used continuously as a separate dwellinghouse for the period of four years preceding the application date. In particular, the evidence demonstrates occupation by an independent tenant only from 9 September 2024 onwards, amounting to less than four years at the date of the application. Accordingly, the applicant has failed to demonstrate that the use described in the application is lawful within the meaning of Section 191 of the Town and Country Planning Act 1990, and the application is therefore refused. First Schedule (operations) Retention of existing self-contained residential outbuilding / dwelling Certificate of Lawful Development (Existing).
From the council's decision notice.
Application details
- Postcode
- EN6 2AN
- Application type
- Certificate Existing Lawful Use/Dev
- Scale / size
- Medium
- Parish
- No Parish
Planning application dates
- Date validated
- 5 June 2026
- Consultation expiry
- 30 June 2026
- Consultation start
- 8 June 2026
- Consultation end
- 29 June 2026
- Neighbour consultation start
- 9 June 2026
- Neighbour consultation end
- 30 June 2026
- Last date for comments
- 30 June 2026
- Target decision date
- 14 August 2026
Applicant and agent
- Applicant
- Private applicant
- Agent
- UPP Architects + Town Planners
- Agent address
- The Atrium The Stables Market Chalk Farm Road Camden NW1 8AH
Planning decision
- Case officer
- Monika Vistartaite
- Statutory period
- 70 days
Additional information
- Documents
- 10
- Constraints
- 9
Site constraints
Designations that overlap or adjoin the site outline.
- Brownfield land register: 171A Mutton Lane, Potters BarRegister site at or near this address
- Flood zone 1: Low probability (rivers and sea)
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, 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 and heritage coasts.
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
1 other application at this property, newest first.
Source: Hertsmere
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Around this site
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