20 Hartwell Gardens Harpenden Hertfordshire AL5 2RW Data via plota.co.uk
Proposal
Proposed first floor side extension with new solar panels, new front two-storey extension, part external cladding, replacement rear bay window, along with internal and external alterations and replacement windows. Data via plota.co.uk
Application progress
Under consideration
No decision has been issued yet. Plota predicts a decision soon after comments close on 19 Nov 2026, from St Albans's recent extensions.
Site constraints 5
Checked on 6 October 2026. The pin for this application is the centre of its postcode rather than the building, so distances to nearby designations are measured from the postcode and can be out by the width of the postcode area. 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 3
Last sold for £1,080,000 in December 2019. 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 June 2019, the latest held for this property, matched to this application by its address. The building may have changed since. View the certificate
Every application in St Albans - and every UK council - as a live feed, an API, or a bulk CSV export.
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Important details
Decision outlook
Day 81 of the 56-day target. St Albans usually decides extensions by day 81.
Plota live figures for extensions decided by St Albans in the last twelve months, from validation. St Albans decision record →
Consultation & key dates
- Alt. reference
- 322877PLN
- Planning Portal ref
- 15032683
- Comments by
- 19 Nov 2026
- Site or press notice
- 6 Aug 2026
- Statutory expiry
- 13 Sept 2026
Historical activity at this location
26 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.
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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20 Hartwell Gardens Harpenden Hertfordshire AL5 2RW
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Comments are open until 19 Nov 2026