18 Castle Road, Isleworth, TW7 6QS

1. 27 Aug 2025

   Received by Hounslow

2. 22 Oct 2025

   Decision issued: GRANT

3. 12 Aug 2026

   Added to PlanIndex

Hounslow granted permission on 22 October 2025, 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.

A lawful development certificate is a legal determination that existing or proposed works do not need planning permission; the merits of the scheme are not considered. More in our guide to planning application types.

• 36 CASTLE ROAD, ISLEWORTH, TW7 6QS

  PA/2019/3928 Submitted 29 Oct 2019 44m away

  Ground floor rear extension 4.925 metres deep, maximum height of 3 metres, 3 metres high to the eaves

  Withdrawn Prior approval Extension 2 docs

• 38 Castle Road, Isleworth, TW7 6QS

  P/2026/0328 Submitted 3 Feb 2026 50m away

  Certificate of lawfulness for the proposed outrigger roof extension to the house

  Granted Lawful development Extension 5 docs

• 107 LINKFIELD ROAD, ISLEWORTH, TW7 6QW

  P/2023/0524 Submitted 16 Feb 2023 57m away

  Erection of a single storey side and rear extension.

  Granted Householder Extension 6 docs
  Small domestic

• 23 GRAINGER ROAD, ISLEWORTH, TW7 6PQ

  P/2021/3246 Submitted 10 Aug 2021 58m away

  Certificate of Lawfulness for the proposed erection of a single storey side / rear infill extension and a rear roof extension incorporating a Juliet balcony and two front roof windows to the house

  Refused Lawful development Extension Windows or glazing 11 docs
  Small domestic

• 29 GRAINGER ROAD, ISLEWORTH, TW7 6PQ

  P/2021/2762 Submitted 7 Jul 2021 63m away

  Erection of a rear outrigger roof extension to the house

  Withdrawn Householder Extension 5 docs
  Domestic

• 29 GRAINGER ROAD, ISLEWORTH, TW7 6PQ

  P/2021/3406 Submitted 20 Aug 2021 63m away

  Certificate of Lawfulness for the erection of an outrigger roof extension incorporating a second front roof window to the house

  Granted Lawful development Extension Windows or glazing 9 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