23 Thornbury Avenue, Isleworth, TW7 4NF

1. 15 Oct 2025

   Received by Hounslow

2. 20 Jan 2026

   Validated

   Checked as complete and ready for consideration.

3. 13 Feb 2026

   Decision issued: APPROVED

4. 12 Aug 2026

   Added to PlanIndex

Hounslow granted permission on 13 February 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.

• 21 Thornbury Avenue, Isleworth, TW7 4NF

  P/2025/2580 Submitted 21 Aug 2025 7m away

  Installation of render the front and side elevation and installation of external wall insulation and render to the rear elevation of the house.

  Granted Householder 7 docs
  Domestic

• 31 THORNBURY AVENUE, ISLEWORTH, TW7 4NF

  P/2023/0164 Submitted 17 Jan 2023 33m away

  Retrospective application for the erection of a single storey side and part rear extension, roof extension with rear and side dormers and roof windows; changes to front boundary wall, rendering of external walls and replacement windows and doors.

  Refused Householder Extension Loft or dormer +1 9 docs
  Small domestic

• 24 THORNBURY AVENUE, ISLEWORTH, TW7 4NQ

  P/2021/2046 Submitted 24 May 2021 38m away

  Variation of Condition 2 (approved plans) and Condition 3 (no additional windows and doors) to improve the appearance and utility of the extension of planning application 01118/24/P1 approved under appeal dated 30/11/2020 for erection of single storey rear extension and side and rear roof dormer extensions with one front roof window to the house and alteration to fenestration.

  Granted Householder Extension Loft or dormer +1 5 docs
  Small domestic

• 24 Thornbury Avenue, Isleworth, TW7 4NQ

  P/2025/3152 Submitted 20 Oct 2025 38m away

  Change of use from a residential house (C3) to a Large House in Multiple Occupation (Sui Generis).

  Refused Full applications 12 docs

• 28 Thornbury Avenue, Isleworth, TW7 4NQ

  P/2024/1877 Submitted 6 Jun 2024 46m away

  Erection of a single storey rear infill replacing the existing conservatory, part single storey rear extension, side and rear roof extension and detached outbuilding at the rear of the garden

  Granted Full applications Extension 26 docs
  Small domestic

• 30 Thornbury Avenue, Isleworth, TW7 4NQ

  P/2026/1623 Submitted 1 Jun 2026 52m away

  Works to tree in a Conservation Area. T1. Apple. Fell to ground level and grind out stump. Rear garden (east boundary)

  Granted Trees 4 docs

• P/2026/2047 Granted

  9 Borough Road, Isleworth, TW7 5DY

  Erection of a single storey rear extension.

  10 Jul 2026 Householder
• P/2026/1858 Granted

  8 CONNAUGHT AVENUE, HOUNSLOW, TW4 5BW

  Erection of single storey front extension to the outbuilding for used as storage, office and a Gym. Following part demolition of the outbuilding.

  23 Jun 2026 Householder
• P/2026/2503 Awaiting decision

  25 Arnold Crescent, Isleworth, TW7 7NS

  Erection of a single storey rear, two storey side extension, and rear roof extension with two front roof windows to the house.

  3 Sep 2026 Householder
• P/2026/1522 Granted

  4 Camborne Way, Hounslow, TW5 0PW

  Erection of a single storey rear extension and reduction in width of the existing side and rear extension.

  20 May 2026 Householder
• P/2026/2024 Granted

  20 Hartland Road, Isleworth, TW7 6RH

  Erection of a rear roof extension with windows to the front of the house.

  8 Jul 2026 Householder