3 Netherfield Road Harpenden Hertfordshire AL5 2AF Data via plota.co.uk
Proposal
The proposed development comprises the construction of a single-storey, detached garden building within the rear garden of the existing residential property The building will provide additional ancillary accommodation for use in connection with the main dwelling, including a small bathroom with a shower, washbasin and WC. The building will be constructed using a timber-framed structure, finished externally with a combination of composite cladding and non-combustible fibre cement cladding, together with aluminium-framed glazed doors and windows. The building will feature a contemporary design with a low-profile roof and will be positioned within the existing garden as illustrated in the accompanying plans and elevations. The proposed building will remain ancillary to the main dwelling and will not be used as independent residential accommodation. No sleeping accommodation is proposed, and there will be no change to the existing residential use of the property. Data via plota.co.uk
Application progress
Under consideration
No decision has been issued yet. Plota predicts a decision between 18 Dec 2026 and 12 Jan 2027, from St Albans's recent extensions.
Documents 4
Application forms 1
Consultation & comments 2
Site constraints 5
Checked on 23 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.
Sales history 2
Last sold for £2,325,000 in October 2025. Detached house, freehold.
Sale prices from HM Land Registry's price paid record, matched to this application by its address.
Building
From the energy performance certificate lodged in October 2022, the latest held for this property. The building may have changed since. View the certificate
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Important details
Decision outlook
Day 14 of the 56-day target. St Albans usually decides extensions by day 77.
Plota live figures for extensions decided by St Albans in the last twelve months, from validation. St Albans decision record →
Public comments
No public comments yet.
11 neighbours consulted · Last counted 23 Oct 2026
Consultation & key dates
- Alt. reference
- PP-15290318
- Planning Portal ref
- PP-15290318
- Neighbours
- 22 Oct 2026
- Consultation
- 22 Oct 2026
- Comments by
- 22 Nov 2026
- Site or press notice
- 29 Oct 2026
- Statutory expiry
- 9 Dec 2026
- Env. assessment
- No
Historical activity at this location
27 previous applications on record - archival context, not part of the live application.
Previous applications at this address
Nearby activity
St Albans is one of the slowest councils in England for householder decisions, ranking #285 out of 296. The council extends the time limit on 64% of applications - one of the highest rates in England. Expect your application to take longer than the standard deadline. Householder applications are slightly less likely to be approved here (88%) than the national average (90%).
Sale prices: Contains HM Land Registry data © Crown copyright and database right 2026. This data is licensed under the Open Government Licence v3.0.
Freehold boundary: © Crown copyright and database rights 2026, HM Land Registry. Polygons © Crown copyright and database rights 2026 Ordnance Survey 100026316. Conditions of use
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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3 Netherfield Road Harpenden Hertfordshire AL5 2AF
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Comments are open until 22 Nov 2026