159 Park Lane Old Knebworth Knebworth Hertfordshire SG3 6PR
Approved on 16 October 2026
Council decision: Conditional Permission3 conditions
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
Single storey rear and front extensions following demolition of existing rear element.
- Received
- 10 September 2026
- Public comments
- 0 · last counted 18 October 2026
- Ward
- Knebworth Ward
- ReceivedReceived10 Sep
- ValidatedValidated10 Sep
- Consult.Consultation10 Oct
- TargetTarget Date
- DecidedDecided16 Oct
Decided in 36 days
About this application
This is a planning application for demolition at 159 Park Lane Old Knebworth Knebworth Hertfordshire SG3 6PR. North Hertfordshire has handled 6,871 applications of this type. This one was decided in 36 days, 13 days quicker than North Hertfordshire's typical decision time. There are no previous applications recorded at this address. In the past year there have been 90 applications across Knebworth Ward. We hold 149 applications in total for the SG3 postcode area.
Application details
- Postcode
- SG3 6PR
- Parish
- Knebworth Parish Council
Planning application dates
- Date validated
- 10 September 2026
- Consultation end
- 10 October 2026
Applicant and agent
- Applicant
- Private applicant
- Architect profile
- AT DESIGN (WELWYN) LTD
Planning decision
- Case officer
- William Thompson
Site constraints
Designations that overlap or adjoin the site outline.
- Green belt: North Hertfordshire
- 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, conservation areas, listed buildings, 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: North Hertfordshire
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For applicants and trades
Contractors near this project
Find contractors for extensions near this site- Leyden Electrical Installations LtdElectrician0.1 mi
- Avelex Electrical LtdElectrician0.6 mi
- Barnett Technical ServicesElectrician0.7 mi
- I W L Contractors LtdElectrician0.7 mi
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