1 New Close Knebworth Hertfordshire SG3 6NU Data via plota.co.uk
Proposal
Two storey side extension following demolition of existing porch. Insertion of front and rear dormer windows to facilitate conversion of loft space to habitable accommodation. Alterations to fenestration and external cladding. Data via plota.co.uk
Application progress
Under consideration
No decision has been issued yet. Plota predicts a decision around 4 Dec 2026, from North Hertfordshire's recent extensions.
Site constraints 2
Checked on 22 October 2026. Historic England, the Environment Agency, Natural England, the British Geological Survey and UK Health Security Agency (radon, contains BGS materials © UKRI) and council datasets, Open Government Licence. A boundary can run through a site and the council holds the definitive record: confirm with the council before relying on this.
Building
From the energy performance certificate lodged in March 2024, the latest held for this property. The building may have changed since. View the certificate
Every application in North Hertfordshire - and every UK council - as a live feed, an API, or a bulk CSV export.
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Important details
- Council
- North Hertfordshire
- Application type
- Full Permission Householder
- Postcode
- SG3 6NU
- Received
- 16 Oct 2026
- Validated
- 16 Oct 2026
- Ward
- Knebworth Ward
- Parish
- Knebworth Parish Council
- Case officer
- Show
- Target decision
- 11 Dec 2026
- Applicant
- Show
- Agent
- Show
Decision outlook
Day 12 of the 56-day target. North Hertfordshire usually decides extensions by day 49.
Plota live figures for extensions decided by North Hertfordshire in the last twelve months, from validation. North Hertfordshire decision record →
Public comments
No public comments yet.
1 neighbour consulted · Last counted 22 Oct 2026
Consultation & key dates
- Alt. reference
- PP-15225420
- Planning Portal ref
- PP-15225420
- Comments by
- 20 Nov 2026
Historical activity at this location
11 nearby applications on record - archival context, not part of the live application.
Nearby activity
North Hertfordshire ranks #128 out of 296 councils for householder decision speed. Householder applications are slightly more likely to be approved here (95%) than the national average (90%).
Energy performance: Energy performance certificates from the Energy Performance of Buildings Register, Ministry of Housing, Communities and Local Government. Contains public sector information licensed under the Open Government Licence v3.0. © Crown copyright 2026.
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1 New Close Knebworth Hertfordshire SG3 6NU
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Comments are open until 20 Nov 2026