138 Watling Street Radlett Hertfordshire WD7 7JH
Refused on 6 May 2026
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 infill extension.
- Received
- 6 March 2026
- Decision level
- Delegated (officer decision)
- Public comments
- 4
- Council
- Hertsmere Borough Council
- Ward
- Aldenham East
- Agent
- MD Designs
- ReceivedReceived6 Mar
- ValidatedValidated13 Mar
- Consult.Consultation6 Apr
- TargetTarget Date8 May
- DecidedDecided6 May
Decided in 54 days (council typically 56)
About this application
This is a full planning application for an extension at 138 Watling Street Radlett Hertfordshire WD7 7JH. Hertsmere has handled 1,861 applications of this type. This one was decided in 61 days, 5 days longer than Hertsmere's typical decision time. The site is in the Radlett South conservation area. There has been 1 other application 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 infill extension would dilute the architectural character and legibility of the historic planform of the dwelling, which is identified as a landmark building in the Conservation Area Appraisal 2012 of the Radlett South Conservation Area. The proposal would therefore result in 'less than substantial harm' to the Radlett South Conservation Area. There are insufficient public benefits to outweigh this harm. The proposal is therefore contrary to policies CS14 and CS22 of the Core Strategy 2013, SADM29, SADM30, HD3 of the Radlett Neighbourhood Plan 2021, and paragraph 215 of the NPPF.
- Insufficient information has been supplied to demonstrate that the proposal would retain and protect adjacent hedges. The proposal therefore fails to demonstrate that it would protect healthy hedges and fails to demonstrate that it would conserve the character and significance of the conservation area. The proposal would be contrary to policies CS12, CS14, CS22 of the Core Strategy 2013, SADM12, SADM29, SADM30 of the Site Allocations and Development Management Plan 2016, and HD5 of the Radlett Neighbourhood Plan 2021.
From the council's decision notice.
Application details
- Postcode
- WD7 7JH
- Application type
- Householder Application
- Scale / size
- Small
- Parish
- Aldenham Parish
Planning application dates
- Date validated
- 13 March 2026
- Consultation expiry
- 16 April 2026
- Consultation start
- 7 May 2026
- Consultation end
- 6 April 2026
- Neighbour consultation start
- 17 March 2026
- Neighbour consultation end
- 9 April 2026
- Last date for comments
- 16 April 2026
- Target decision date
- 8 May 2026
- Decision issued
- 7 May 2026
Applicant and agent
- Agent
- MD Designs
- Agent address
- 9 Jepps Close Goffs Oak Herts EN7 6UT
Planning decision
- Statutory period
- 56 days
Publicity
- Last advertised
- 26 March 2026
- Advertisement expiry
- 16 April 2026
- Site notice start
- 24 March 2026
- Site notice end
- 14 April 2026
Additional information
- Planning Portal ID
- PP-14760826
- Documents
- 10
- Constraints
- 12
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
1 other application at this property, newest first.
Source: Hertsmere
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Around this site
Nearby applications
- 144 Watling Street Radlett Hertfordshire WD7 7JH25/1376/FUL · FullRefused0.0 mi
- 144 Watling Street Radlett Hertfordshire WD7 7JH25/0231/HSE · FullWithdrawn0.0 mi
- 144 Watling Street Radlett Hertfordshire WD7 7JH25/0088/HSE · FullApproved0.0 mi
- 148 Watling Street Radlett Hertfordshire WD7 7JH24/1258/HSE · FullApproved0.0 mi
- 7 Christchurch Crescent Radlett Hertfordshire WD7 8AG26/0511/MA · AmendmentApproved0.0 mi
For applicants and trades
Contractors near this project
Find contractors for extensions near this site- B & C Security Services LLP0.3 mi
- Solid Renewables LimitedPlumber & Heating Engineer0.4 mi
- 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.