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70 Hillside Avenue Borehamwood Hertfordshire WD6 1HL

26/0334/CLPCertificate Proposed Lawful Use/DevApproved
Outline / PiP

Approved on 14 May 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 to include hip to gable roof alterations, rear dormer, 1x front rooflight and removal of chimney stack Certificate of Lawful Development (Proposed).

Received
12 March 2026
Decision level
Delegated (officer decision)
Ward
Borehamwood Hillside
Agent
Matteo Sarno Architecture
  1. Received12 Mar
  2. Validated12 Mar
  3. Consult.
  4. Target6 May
  5. Decided14 May

Decided in 63 days (council typically 56)

About this application

This is an outline application for a dormer extension at 70 Hillside Avenue Borehamwood Hertfordshire WD6 1HL. Hertsmere has handled 952 applications of this type. This one was decided in 63 days, 7 days longer than Hertsmere's typical decision time. There has been 1 other application 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 1HL
Application type
Certificate Proposed Lawful Use/Dev
Scale / size
Small
Parish
Elstree & Borehamwood Town Council

Planning application dates

Date validated
12 March 2026
Target decision date
6 May 2026
Decision issued
18 May 2026
Permission expires
18 May 2029

Applicant and agent

Agent
Matteo Sarno Architecture
Architect profile
MATTEO SARNO ARCHITECTURE LTD
Agent address
57 Kelday Heights 2 Spencer Way London E1 2PW

Planning decision

Statutory period
55 days

Additional information

Planning Portal ID
PP-14765884
Comments
0
Documents
12
Constraints
9

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. 2026
    12 Mar

    Single storey rear extension. Depth: 6.00m, Height: 3.75m, Eaves: 2.75 m.

    ApprovedPD- Prior Approval 42 day (Hsehold ext)Filed alongside26/0333/PD42
  2. 2026
    12 Mar

    Conversion of loft to habitable space to include hip to gable roof alterations, rear dormer, 1x front…

    This applicationApprovedOutline26/0334/CLP

Source: Hertsmere

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