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21 Holly Drive Potters Bar Hertfordshire EN6 2QL

26/0718/CLPCertificate Proposed Lawful Use/DevRefused
Outline / PiP

Refused on 14 July 2026

Council decision: Refuse to Grant CertificateDelegated (officer decision)1 reason for refusal

Approximate location: the centre of the postcode, not the exact property.

Proposal

Construction of part single, part two storey rear extension with associated roof works Certificate of Lawful Development (Proposed).

Received
26 May 2026
Decision level
Delegated (officer decision)
Public comments
6
Ward
Bentley Heath & The Royds
Agent
Dimensions- Planning&Architecture
  1. Received26 May
  2. Validated26 May
  3. Consult.
  4. Target21 Jul
  5. Decided14 Jul

Decided in 49 days (council typically 56)

About this application

This is an outline application for a two storey rear extension at 21 Holly Drive Potters Bar Hertfordshire EN6 2QL. Hertsmere has handled 952 applications of this type. This one was decided in 49 days, 7 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 108 applications across Bentley Heath & The Royds. 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

Why it was refused

  1. The proposed development does not satisfy the criteria as set out in paragraph A.1.(i) of Class A, Part 1, Schedule 2 of the Town and Country Planning (General Permitted Development) (England) Order 2015 (or as amended). Where any part of a proposed extension to a house is within 2m of the boundary then the maximum height of the eaves of the total development should not exceed 3m. In this instance, the proposed two-storey element would be attached to the proposed single-storey extensions which would be sited within 2m of the side boundary of the property. Accordingly, the application for a Certificate of Lawful development (proposed) should be refused. First Schedule (description of use/operations/matter) Construction of part single, part two storey rear extension with associated roof works. Certificate of Lawful Development (Proposed).

From the council's decision notice.

Application details

Postcode
EN6 2QL
Application type
Certificate Proposed Lawful Use/Dev
Scale / size
Small
Parish
No Parish

Planning application dates

Date validated
26 May 2026
Neighbour consultation start
15 July 2026
Target decision date
21 July 2026
Decision issued
15 July 2026

Applicant and agent

Agent
Dimensions- Planning&Architecture
Agent address
Unit 7 Hawthorn Business Park 165 Granville Road London NW2 2AZ

Planning decision

Statutory period
56 days

Additional information

Planning Portal ID
PP-14893372
Documents
5
Constraints
8

Site constraints

Checking the site
2/3
Council recordsAppealsFlood risk

Designations at the address point. Ones next to the site may also apply.

  • 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 (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: Hertsmere

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