21 Berkeley Waye, Hounslow, TW5 9HJ

1. 29 Oct 2025

   Received by Hounslow

2. 9 Dec 2025

   Validated

   Checked as complete and ready for consideration.

3. 3 Feb 2026

   Decision issued: GRANT

4. 12 Aug 2026

   Added to PlanIndex

Permission has been granted, usually subject to conditions listed on the decision notice, some of which must be discharged before work starts. The decision notice on the council portal sets out exactly what was approved.

Work must normally begin within three years of the decision or the permission lapses. Neighbours cannot appeal a grant; challenging one means judicial review of how the decision was made, within tight time limits.

A lawful development certificate is a legal determination, not a planning judgement. It asks the council to confirm either that existing use or works are lawful, often through the passage of time, or that a proposal would not need planning permission at all. The applicant must prove the facts; the merits of the scheme are not considered.

More on lawful development applications in our guide

• 21 Berkeley Waye, Hounslow, TW5 9HJ

  PA/2026/1812 Submitted 17 Jun 2026 0m away

  Ground floor rear extension 6.00 metres deep, maximum height 3.40 metres, 2.90 metres high to the eaves.

  Refused Prior approval Extension 5 docs

• 16 Somerset Waye, Hounslow, TW5 9HG

  P/2026/2473 Submitted 1 Sep 2026 46m away

  100% historically approved · decision due ~27 Oct

  Certificate of lawfulness for the proposed erection of a rear roof extension with two roof windows to the front and alterations to the existing side roof from flat roof to pitched roof.

  Awaiting decision Lawful development Extension Windows or glazing 10 docs

• 16 Somerset Waye, Hounslow, TW5 9HG

  P/2026/0126 Submitted 15 Jan 2026 46m away

  Erection of a rear roof extension and hip to gable conversion with two front roof windows to the house

  Refused Householder Extension Loft or dormer +1 6 docs
  Domestic

• 16 Somerset Waye, Hounslow, TW5 9HG

  P/2026/0127 Submitted 15 Jan 2026 46m away

  Erection of a part first floor rear extension to the house

  Granted Householder Extension 8 docs
  Domestic

• 16 Somerset Waye, Hounslow, TW5 9HG

  P/2026/1323 Submitted 30 Apr 2026 46m away

  Erection of a hip to gable and rear roof extension to the main part of the house with two front roof windows

  Refused Householder Extension Loft or dormer +1 6 docs
  Domestic

• 13 Somerset Waye, Hounslow, TW5 9HF

  PA/2025/2970 Submitted 3 Oct 2025 85m away

  Ground floor rear extension 6.00 metres deep, maximum height of 2.95 metres, 2.95 metres high to the eaves

  Granted Prior approval Extension 6 docs

• P/2026/2033 Granted

  3 Benedict Drive, Feltham, TW14 8JH

  Certificate of lawfulness for the proposed erection of a rear roof extension with hip to gable conversion with windows to the front and side of the house.

  8 Jul 2026 Lawful development
• P/2026/2027 Granted

  115 Northumberland Crescent, Feltham, TW14 9SP

  Certificate of lawfulness for the proposed erection of a rear roof extension and windows to the front of the house.

  8 Jul 2026 Lawful development
• P/2026/2009 Granted

  3 Brainton Avenue, Feltham, TW14 0AZ

  Certificate of lawfulness for the proposed erection of a rear roof extension and Juliette balcony with front roof windows to the house.

  7 Jul 2026 Lawful development
• P/2026/2014 Granted

  82 Sussex Avenue, Isleworth, TW7 6LB

  Certificate of lawfulness for the proposed erection of a rear roof extension, a porch to the front of the house, and a front roof window.

  7 Jul 2026 Lawful development
• P/2026/2473 Awaiting decision

  16 Somerset Waye, Hounslow, TW5 9HG

  Certificate of lawfulness for the proposed erection of a rear roof extension with two roof windows to the front and alterations to the existing side roof from flat roof to pitched roof.

  1 Sep 2026 Lawful development