21 Cassiobury Drive Watford WD17 3AA

1. 5 May 2026

   Received by Watford

2. 21 May 2026

   Validated

   Checked as complete and ready for consideration.

3. 20 Jul 2026

   Decision issued: Conditional Planning Permission

4. 24 Jul 2026

   Added to PlanIndex

Watford granted permission on 20 July 2026, subject to any conditions on the decision notice. Work must normally begin within three years or the permission lapses. More in our guide to what happens after a planning decision.

Householder applications cover work to an existing house and its garden, such as extensions, lofts and outbuildings, and cannot create a separate dwelling or change what the building is used for. More in our guide to planning application types.

• 25 Cassiobury Drive Watford Hertfordshire WD17 3AA

  22/00524/FULH Submitted 21 Apr 2022 50 yards away

  Retrospective application to retain garden outbuilding (games room)

  Granted Householder 8 docs
  Small domestic

• 45 Cassiobury Drive Watford WD17 3AA

  25/00223/NONMAT Submitted 10 Mar 2025 50 yards away

  Non material amendment to internal layout and measurements of the building pursuant to planning permission 24/00547/FULH

  Granted Amendments 7 docs

• 15 Cassiobury Drive Watford WD17 3AA

  22/00592/FULH Submitted 4 May 2022 50 yards away

  Erection of a single storey rear extension with flat roof and rooflights.

  Granted Householder Extension Loft or dormer 7 docs
  Small domestic

• 12 Cassiobury Drive Watford WD17 3AB

  20/00622/NONMAT Submitted 19 Jun 2020 50 yards away

  Non-material amendment to planning permission 18/01584/FUL to replace 1st floor rear bedroom window with a Juliet balcony.

  Granted Amendments Windows or glazing 5 docs

• 22 Cassiobury Drive Watford Hertfordshire WD17 3AB

  22/01345/VAR Submitted 18 Nov 2022 50 yards away

  Variation of Condition 2 (approved plans) of planning permission 21/01806/FULH for the use of smooth white render to the external walls and the addition of two roof lanterns to the rear extension roof and change from mono-pitched roof to the single storey side extension to a flat roof

  Granted Amendments Extension 5 docs
  Small domestic

• 22 Cassiobury Drive Watford WD17 3AB

  21/01806/FULH Submitted 13 Dec 2021 50 yards away

  Erection of part single storey, part two storey rear extension, first floor side extension, conversion of garage to habitable space, front entrance porch, new roof to provide habitable space, the ridge height of the new roof to match the existing. As previously approved under application ref: 21/01465/FULH and ground floor rear extension under: 21/01454/HPD.

  Granted Householder Extension Roofing 7 docs
  Small domestic

• 26/00712/FULH Awaiting decision

  32 Gade Avenue Watford Hertfordshire WD18 7LG

  Erection of a single storey rear extension and internal alterations.

  Received 8 Sep, published by the council 14 Sep 2026 Householder
• 26/00491/FULH Granted

  88 High Road Watford WD25 7LJ

  Retrospective planning application for timber framed cantilevered garden barbecue canopy with roof tiles to match existing

  Received 29 Jun, published by the council 24 Jul 2026 Householder
• 26/00559/FULH Granted

  157 Cassiobury Drive Watford WD17 3AL

  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.

  Received 21 Jul, published by the council 26 Jul 2026 Householder
• 26/00550/FULH Granted

  39 The Ridgeway Watford WD17 4TH

  Proposed roof alteration and conversion of loft into habitable room with roof lights.

  Received 17 Jul, published by the council 26 Jul 2026 Householder
• 26/00601/FULH Granted

  28 Oakdene Road Watford WD24 6RW

  Erection of first floor rear extension

  Received 3 Aug, published by the council 9 Aug 2026 Householder