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28 Whitehouse Avenue Borehamwood Hertfordshire WD6 1HD

25/1801/CLPCertificate Proposed Lawful Use/DevApproved
Outline / PiP

Approved on 21 January 2026

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 with hip-to-gable roof alterations to include rear dormer and insertion of 1x front roof light. Erection of outbuilding for gym and office use. Certificate of Lawful Development (Proposed).

Received
17 December 2025
Decision level
Delegated (officer decision)
Ward
Borehamwood Hillside
Agent
SMA Studio Barnet Ltd
  1. Received17 Dec
  2. Validated17 Dec
  3. Consult.
  4. Target11 Feb
  5. Decided21 Jan

Decided in 35 days (council typically 56)

About this application

This is an outline application for a dormer extension at 28 Whitehouse Avenue Borehamwood Hertfordshire WD6 1HD. Hertsmere has handled 952 applications of this type. This one was decided in 35 days, 3 weeks quicker than Hertsmere's typical decision time. There have been 2 other applications at this address. In the past year there have been 87 applications across Borehamwood Hillside. We hold 1,685 applications in total for the WD6 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
WD6 1HD
Application type
Certificate Proposed Lawful Use/Dev
Scale / size
Small
Parish
Elstree & Borehamwood Town Council

Planning application dates

Date validated
17 December 2025
Target decision date
11 February 2026
Decision issued
22 January 2026
Permission expires
22 January 2029

Applicant and agent

Agent
SMA Studio Barnet Ltd
Architect profile
SMA STUDIO BARNET LTD
Agent address
35 Grimsdyke Crescent Barnet Barnet Hertfordshire EN5 4AQ

Planning decision

Statutory period
56 days

Additional information

Planning Portal ID
PP-14571318
Comments
0
Documents
27
Constraints
11

Site constraints

Checking the site
2/3
Council recordsAppealsFlood risk

Designations that overlap or adjoin the site outline.

  • 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.

Associated applications

  1. 2025
    17 Dec

    Conversion of loft to habitable space with hip-to-gable roof alterations to include rear dormer and insertion…

    This applicationApprovedOutline25/1801/CLP
  2. 2025
    17 Dec

    Single storey rear extension. Depth: 6m, Height: 2.99m, Eaves: 2.8m.

    ApprovedApplicationFiled alongside25/1802/PD42

Source: Hertsmere

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