157 Cassiobury Drive Watford WD17 3AL Data via plota.co.uk
Proposal
Proposed roof alteration involving double hip-to-gable conversion; erection of a rear crown-roof dormer; erection of a front dormer; installation of 4 x roof lights on the front and front/side roof slope; installation of new windows to the front, rear and side; installation of a side door to the ground floor; changes to finish materials; internal alterations. Data via plota.co.uk
Application progress
Approved on 8 Sept 2026 · Delegated Decision · Last checked 10 Sept 2026
Documents 17
Decision & officer reports 1
Statements & assessments 1
Plans & drawings 12
Application forms 2
Other documents 1
Site constraints 3
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.
Sales history 1
Last sold for £587,000 in November 2018. 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 2016, 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.
Other new applications on this street
195 Cassiobury Drive Watford WD17 3AL
Demolition of outbuilding, erection of part single, part two storey rear extensi...
39 Cassiobury Drive Watford WD17 3AA
Non - material amendment pursuant to planning permission 26/00153/FULH for chang...
346 And 348 Cassiobury Drive Watford WD17 3AW
Erection of single storey and first floor rear extensions to the existing dwelli...
350 Cassiobury Drive Watford WD17 3AW
(Retrospective) Erection of single storey rear outbuilding with hipped roof, bri...
Nearby new applications
195 Cassiobury Drive Watford WD17 3AL
Demolition of outbuilding, erection of part single, part two storey rear extensi...
14 Cottage Close Watford WD17 3NN
Works to trees T15 and T16 , x2 Sycamores under TPO.No.49 - reduce height by 2m ...
11 Cottage Close Watford WD17 3NN
Works to tree (T19 Oak) under Group G1 TPO.No.52 - Reduce height by up to 2m and...
8 Richmond Drive Watford WD17 3BG
Demolition of existing garage to side and erection of single storey side extensi...
3 Coningesby Drive Watford Hertfordshire WD17 3BD
Lawful development certificate for proposed new front porch and conversion of th...
1B Temple Close Watford WD17 3DR
Works to trees under TPO175 Indian Bean Tree - pollard of 2metres crown reductio...
Important details
How this decision compares
Decided in 49 days from validation, about the council's usual 46 days. Approved, as 79% of extensions here are.
Plota live figures for extensions decided by Watford in the last twelve months, from validation. Watford decision record →
Public comments
No public comments yet.
3 neighbours consulted · Last counted 10 Sept 2026
Consultation & key dates
- Alt. reference
- PP-15096145
- Planning Portal ref
- PP-15096145
- Comments by
- 12 Aug 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
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.
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.
Track this application
157 Cassiobury Drive Watford WD17 3AL
Tracking this application
Not there after a minute? Check your junk folder. It's from alerts@plota.co.uk.
Go to your dashboard →Sign in to view contact details
Applicant and case-officer names are hidden from public view for privacy. Create a free Plota account - or sign back in - and we'll show them, plus you get a dashboard for alerts and tracked applications.
