157 Cassiobury Drive Watford WD17 3AL

1. 12 May 2026

   Received by Watford

2. 17 Jun 2026

   Decision issued: Conditional Planning Permission

3. 9 Aug 2026

   Added to PlanIndex

The council has decided this application; the published outcome sits in the record above and the decision notice on the council portal carries the detail, including any conditions.

If permission was granted, work must normally begin within three years of the decision. If it was refused, the applicant can appeal within the statutory time limit or submit a revised scheme.

Householder applications cover work to an existing house and its garden: extensions, loft and garage conversions, porches, outbuildings and similar alterations within the boundary of the home. They cannot be used to create a separate dwelling or change what the building is used for. Councils aim to decide them within eight weeks, and immediate neighbours are usually notified and given a chance to comment.

More on householder applications in our guide

• 157 Cassiobury Drive Watford WD17 3AL

  26/00559/FULH Submitted 21 Jul 2026 0m away

  0% historically approved · decision due ~15 Sep

  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.

  Awaiting decision Householder Loft or dormer Windows or glazing 16 docs
  Domestic

• 157 Cassiobury Drive Watford WD17 3AL

  26/00192/FULH Submitted 9 Mar 2026 0m away

  Proposed roof alteration involving double hip-to-gable conversion; erection of a rear, crown-roof dormer with french doors and juliet balcony; installation of 6 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.

  Refused Householder Loft or dormer Windows or glazing 19 docs
  Domestic

• 157 Cassiobury Drive Watford WD17 3AL

  23/01028/LDC Submitted 10 Nov 2023 4m away

  Lawful Development Certificate For Roof alteration involving double hip to gable barn-end conversion; erection of a rear dormer with French Doors with Juliet Balcony; installation of front and side facing roof lights and new casement windows to thee front and rear

  Refused Lawful development Loft or dormer Windows or glazing 19 docs

• 74 Langley Way Watford WD17 3FB

  26/00155/FULH Submitted 26 Feb 2026 70m away

  Erection of 2 storey side extension and a porch with changes to fenstration on first floor facing Langley Road

  Refused Householder Extension 14 docs
  Small domestic

• 69 Langley Way Watford Hertfordshire WD17 3EB

  22/01253/FULH Submitted 26 Oct 2022 70m away

  Changes to the proposed extensions approved under planning permission ref: 22/00723/FULH. Erection of rear balcony, addition of rooflight above single storey rear extension, replacement of window in side extension front elevation for a door, addition of door to side elevation, repositioning of front entrance door, reduction in number of rooflights.

  Decided Householder Extension Loft or dormer +1 6 docs
  Small domestic

• 69 Langley Way Watford Hertfordshire WD17 3EB

  22/00723/FULH Submitted 31 May 2022 70m away

  Erection of part single storey, part two storey rear extension, two storey side extension and loft conversion including front and rear rooflights; renewal of previously approved application ref: 18/01493/FULH.

  Decided Householder Extension Loft or dormer 5 docs
  Small domestic

• 26/00582/FULH Decided

  23 Westlea Avenue Watford WD25 9DH

  Erection of single story side extension and front porch extension

  28 Jul 2026 Householder
• 26/00507/FULH Decided

  96 Sheepcot Lane Watford WD25 0EB

  Erection of single storey rear extension and double storey side and rear extension and fenestration alterations

  2 Jul 2026 Householder
• 26/00506/FULH Decided

  20 Orchard Drive Watford WD17 3DY

  Erection of part two storey rear extension and hip to gable loft conversion including rear domer extension and x 3 front rooflights

  1 Jul 2026 Householder
• 26/00443/FULH Refused

  71 Princes Avenue Watford WD18 7RR

  Erection of single storey side and rear extension

  11 Jun 2026 Householder
• 26/00688/FULH Awaiting decision

  54 Kingsfield Road Watford Hertfordshire WD19 4TR

  Erection of ground floor single storey rear and side return extension, hip to gable loft conversion including rear dormer

  27 Aug 2026 Householder