8 Sidmouth Avenue, Isleworth, TW7 4DW

1. 13 Nov 2025

   Received by Hounslow

2. 6 Jan 2026

   Decision issued: GRANT

3. 12 Aug 2026

   Added to PlanIndex

Hounslow granted permission on 6 January 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.

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.

• 7 SIDMOUTH AVENUE, ISLEWORTH, TW7 4DW

  PA/2023/0610 Submitted 23 Feb 2023 8m away

  Ground floor rear extension 4.00 metres deep, maximum height 3.54 metres, 3.00 metres high to the eaves

  Granted Prior approval Extension 5 docs

• 65 Sidmouth Avenue, Isleworth, TW7 4DR

  P/2024/3245 Submitted 27 Sep 2024 32m away

  Certificate of Lawfulness for the proposed change of use from Use Class C3(a) to Use Class C3(b).

  Granted Lawful development 8 docs

• 14 SIDMOUTH AVENUE, ISLEWORTH, TW7 4DW

  P/2021/2208 Submitted 3 Jun 2021 37m away

  Certificate of Lawfulness for proposed erection of a rear roof extension incorporating hip to gable conversion and two front roof windows; Alterations to the existing ground floor rear extension comprising of the removal of the existing opens and installation of one new window and French doors to the house

  Granted Lawful development Extension Loft or dormer +1 5 docs

• 16 Sidmouth Avenue, Isleworth, TW7 4DW

  PA/2026/1784 Submitted 16 Jun 2026 49m away

  Ground floor rear extension 5.00 metres deep, maximum height of 3.20 metres, 3.00 metres high to the eaves

  Granted Prior approval Extension 7 docs

• 12 Crawford Close, Isleworth, TW7 4DP

  P/2026/2069 Submitted 15 Jul 2026 92m away

  Non material amendment to allow the increase of the width of the single storey side extension from 0.8m to 1.35m of planning permission P/2024/1156 approved 18/06/2024 for the erection of single storey rear, single storey side and part first floor rear extension to the house

  Refused Amendments Extension 3 docs
  Small domestic

• 47 Sidmouth Avenue, Isleworth, TW7 4DR

  P/2024/3461 Submitted 16 Oct 2024 93m away

  Certificate of Lawfulness for the proposed erection of a single storey rear extension to the house.

  Granted Lawful development Extension 6 docs
  Small domestic

• 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