Applecross Chamberlaines Kinsbourne Green Hertfordshire Harpenden AL5 3PW
Refused on 4 September 2026
Council decision: Certificate of Lawfulness Refused1 reason for refusal
Proposal
Certificate of Lawfulness (proposed) - Two storey/singe storey rear extension. Porch roof extension at Applecross Chamberlaines Kinsbourne Green Hertfordshire Harpenden AL5 3PW
- Received
- 1 May 2026
- Ward
- Harpenden North & Rural
- ReceivedReceived1 May
- ValidatedValidated15 Jul
- Consult.Consultation7 Aug
- TargetTarget Date7 Aug
- DecidedDecided4 Sep
Decided in 51 days
About this application
This is a planning application for a rear extension at Applecross Chamberlaines Kinsbourne Green Hertfordshire Harpenden AL5 3PW. St Albans has handled 12,346 applications of this type. This one was decided in 51 days, 5 days quicker than St Albans's typical decision time. There are no previous applications recorded at this address. In the past year there have been 96 applications across Harpenden North & Rural. We hold 3,774 applications in total for the AL5 postcode area.
Why it was refused
- A Certificate of Lawfulness (proposed) cannot be issued on the basis that the proposal does not comply with the requirements of Class B, B.1 (d), Part 1, Schedule 2 of the Town and Country Planning (General Permitted Development (England) Order 2015 as amended. The proposed enlargement to the roof and previous extensions to the roof result in the cumulative roof space exceed the permitted 50m3 for detached dwellings. Formal planning permission would therefore be required. Christine Traill Strategic Director – Community and Place Delivery Dated 04/09/2026 First Schedule (Development/Use) - Certificate of Lawfulness (proposed) - Two storey/singe storey rear extension.
From the council's decision notice.
Application details
- Postcode
- AL5 3PW
- Parish
- Harpenden Rural
Planning application dates
- Date validated
- 15 July 2026
- Consultation end
- 7 August 2026
- Target decision date
- 7 August 2026
Applicant and agent
- Applicant
- Private applicant
- Agent
- Howard Pease
- Architect profile
- HOWARD PEASE ARCHITECTS LIMITED
Site constraints
Designations at the address point. Ones next to the site may also apply.
- Green belt: St Albans
- Flood zone 1: Low probability (rivers and sea)
Also checked, none recorded (23)
flood storage areas, conservation areas, listed buildings, Article 4 directions, tree preservation orders, 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: St Albans
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