144 Watling Street Radlett Hertfordshire WD7 7JH
Refused on 17 November 2025
Council decision: Refuse PermissionDelegated (officer decision)2 reasons 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
Construction of single storey rear extension with insertion of 1x rooflight.
- Received
- 18 September 2025
- Decision level
- Delegated (officer decision)
- Public comments
- 2
- Council
- Hertsmere Borough Council
- Ward
- Aldenham East
- Agent
- Space M Studio
- ReceivedReceived18 Sep
- ValidatedValidated23 Sep
- Consult.Consultation15 Oct
- TargetTarget Date18 Nov
- DecidedDecided17 Nov
Decided in 55 days (council typically 56)
About this application
This is a full planning application for a single storey rear extension at 144 Watling Street Radlett Hertfordshire WD7 7JH. Hertsmere has handled 1,861 applications of this type. This one was decided in 60 days, 4 days longer than Hertsmere's typical decision time. The site is in the Radlett South conservation area. There have been 2 other applications at this address. In the past year there have been 172 applications across Aldenham East. We hold 1,025 applications in total for the WD7 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
Why it was refused
- The proposed single storey rear extension, by reason of its siting, scale, bulk, massing, materials and design, would have a detrimental impact in terms of its character and appearance on the dwelling and would undermine the plan form and detract from the architectural quality of the property, resulting in 'less than substantial harm' to the conservation area. Insufficient public benefits exist which would outweigh this harm. The proposal therefore does not comply with the NPPF 2024, Development Plan including Core Strategy policies SP1 Creating Sustainable Development, CS14, CS22, Policy HD3 of the Radlett Neighbourhood Plan, SADM Policies SADM29 and SADM30 and the Planning and Design Guide Part E.
- Having regard to impacts upon neighbours, it has been found that the proposed single storey rear extension due to its design, scale, siting, depth, height and massing would result in a substantial breach of the 45 degree assessment line with the neighbouring dwelling at no.146 Watling Street and would cause undue harm to the residential amenities of the neighbouring dwelling by virtue of loss of light, outlook and detrimental overbearing impact. The proposal therefore does not comply with the NPPF 2024, Development Plan including Core Strategy policies SP1 Creating Sustainable Development, CS14, CS22, Policy HD3 of the Radlett Neighbourhood Plan, SADM Policies SADM29 and SADM30 and the Planning and Design Guide Part E. .
From the council's decision notice.
Application details
- Postcode
- WD7 7JH
- Application type
- Full Planning Permission
- Scale / size
- Small
- Parish
- Aldenham Parish
Planning application dates
- Date validated
- 23 September 2025
- Consultation expiry
- 23 October 2025
- Consultation start
- 18 November 2025
- Consultation end
- 15 October 2025
- Neighbour consultation start
- 25 September 2025
- Neighbour consultation end
- 16 October 2025
- Last date for comments
- 23 October 2025
- Target decision date
- 18 November 2025
- Decision issued
- 18 November 2025
Applicant and agent
- Agent
- Space M Studio
- Agent address
- The Coach House, 29 Birmingham Road Whitacre Heath Warwickshire B46 2ET
Planning decision
- Statutory period
- 56 days
Publicity
- Last advertised
- 2 October 2025
- Advertisement expiry
- 23 October 2025
Appeal history
Additional information
- Planning Portal ID
- PP-14342050
- Documents
- 13
- Constraints
- 18
Site constraints
Designations that overlap or adjoin the site outline.
- Conservation area: Radlett South
- 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, 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.
Planning history at this site
2 other applications at this property, newest first.
Source: Hertsmere
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Around this site
Nearby applications
- 144 Watling Street Radlett Hertfordshire WD7 7JH25/0088/HSE · FullApproved0.0 mi
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For applicants and trades
Contractors near this project
Find contractors for extensions near this site- B & C Security Services LLP0.3 mi
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- VaRa Garden DesignProfessional Garden Designer0.4 mi
- Fix Double Glazing LimitedWindow & Door Installer0.5 mi
Planning something similar?
See what the council approved and refused for single-storey rear extensions on your street. Pick your home and get the evidence before you pay for drawings.