346 And 348 Cassiobury Drive Watford WD17 3AW Data via plota.co.uk
Proposal
Erection of single storey and first floor rear extensions to the existing dwelling, alterations to the existing roof and associated internal and external alterations, with retention of the existing garage at No 346 and Erection of single storey and first floor rear extensions to the existing dwelling, conversion of the roof space to provide additional habitable accommodation, installation of front and rear dormer windows and rooflights, alterations to the existing roof and associated internal and external alterations at No.348 Data via plota.co.uk
Application progress
Under consideration
No decision has been issued yet. Plota predicts a decision around 29 Oct 2026, from Watford's recent extensions.
Documents 21
Statements & assessments 1
Plans & drawings 18
Site constraints 4
Checked on 6 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 April 2026, the latest held for this property. The building may have changed since. View the certificate
Every application in Watford - and every UK council - as a live feed, an API, or a bulk CSV export.
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Important details
Decision outlook
Day 50, past Watford's usual 46 days for extensions. 99% are decided within thirteen weeks, so most likely by 9 Dec 2026.
Plota live figures for extensions decided by Watford in the last twelve months, from validation. Watford decision record →
Public comments
No public comments yet.
11 neighbours consulted · Last counted 28 Oct 2026
Consultation & key dates
- Alt. reference
- PP-15133906
- Planning Portal ref
- PP-15133906
- Comments by
- 30 Sept 2026
- Env. assessment
- No
Historical activity at this location
25 nearby applications on record - archival context, not part of the live application.
Nearby activity
Watford is faster than most councils at deciding householder applications, ranking #41 out of 296. Only 21% of applications have the time limit extended, well below the 41% national average - the council usually decides on time. Watford is also one of the strictest councils - it refuses more householder applications than almost any other, with only 81% approved vs 90% nationally.
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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346 And 348 Cassiobury Drive Watford WD17 3AW
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The consultation period closed on 30 Sept 2026.