23 Hillside Avenue Borehamwood Hertfordshire WD6 1HG Data via plota.co.uk
Proposal
Partially retrospective application for alterations to existing first floor rear extension, and reduction to bulk of rear extension to loft and roof, to regularise works carried out following approval of application reference . Data via plota.co.uk
Application progress
As of 22 Aug 2026, the council is no longer showing this application on their planning portal. It may have been withdrawn or re-listed under a different reference. We've stopped checking it for updates.
Documents 9
Plans & drawings 7
Application forms 1
Other documents 1
Associated applications 2
Part of
- HouseholderPartially retrospective application for alterations to existing first floor rear extension…This application26/0693/HSE
Site constraints 1
Checked on 6 October 2026. Historic England, the Environment Agency, Natural England 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 1
Last sold for £478,000 in July 2016. Semi-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 April 2016, the latest held for this property. The building may have changed since. View the certificate
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Important details
Decision outlook
Day 128, past the statutory target. 94% of extensions in Hertsmere are decided within thirteen weeks; extensions of time are common, and the council need not decide on the day. Last seen undecided on 21 Aug 2026.
Plota live figures for extensions decided by Hertsmere in the last twelve months, from validation. Hertsmere decision record →
Public comments
No public comments yet.
6 neighbours consulted · Last counted 21 Aug 2026
Consultation & key dates
- Alt. reference
- PP-14952532
- Planning Portal ref
- PP-14952532
- Neighbours
- 9 Jun 2026
- Consultation
- 8 Jun 2026
- Comments by
- 30 Jun 2026
- Statutory expiry
- 29 Jul 2026
- Env. assessment
- No
Historical activity at this location
25 nearby applications on record - archival context, not part of the live application.
Nearby activity
Hertsmere is slower than most councils at deciding householder applications, ranking #243 out of 296. 55% of applications have the time limit extended, above the 41% national average. Householder applications are slightly more likely to be approved here (94%) 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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23 Hillside Avenue Borehamwood Hertfordshire WD6 1HG
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Referenced application
Council archive
21 & 23 Hillside Avenue Borehamwood Hertfordshire WD6 1HG
Two storey rear extension to No.21 and first floor rear extension to No.23.
- Received
- 21 Apr 2021
- Decided
- 15 Jun 2021
- Outcome
- Approved