26 Thornton Avenue,Chiswick,W4 1QG

1. 14 Aug 2026

   Received by Hounslow

2. 23 Aug 2026

   Added to PlanIndex

3. Decision

   Awaiting decision

   Decision expected by 9 October 2026, 8 weeks from validation under the statutory target for most applications. Extensions of time are common and are agreed case by case.

   Hounslow took a median of 55 days over the applications it decided in the last year.

This application is with Hounslow for determination. The council publicises it, consults neighbours and technical bodies where required, and weighs the responses against local and national planning policy.

The statutory target is eight weeks for most applications and thirteen for major development, though extensions of time are common. Comments carry most weight while the case is undecided, so check the council portal for the deadline if you want to respond.

This type of application deals with conditions attached to an existing permission, either by supplying the details a condition requires, called discharging it, or by asking to vary or remove one. It does not reopen the principle of the permission itself. Building often cannot lawfully start, or continue past a set stage, until the named conditions are discharged.

More on conditions applications in our guide

• 26 Thornton Avenue, Chiswick, London, W4 1QG

  P/2026/0194 Submitted 21 Jan 2026 0m away

  Erection of single storey side extension and rear extension. Enlargement of the existing basement. Replacing existing windows. Installation of air source heat pump in rear garden. Installation of new fencing on the front boundary. Conversion of the existing two self contained flats to a single family house.

  Granted Full applications New dwelling Extension +1 15 docs
  Small domestic

• 26 Thornton Avenue,Chiswick,London,W4 1QG

  P/2026/1399 Submitted 8 May 2026 0m away

  Certificate of Lawfulness for proposed enlargement of rear roof extension, erection of rear outrigger extension, and installation of two front roof windows.

  Granted Lawful development Extension Windows or glazing 6 docs

• 22 THORNTON AVENUE, CHISWICK, W4 1QG

  P/2019/3933 Submitted 29 Oct 2019 12m away

  Erection of a single storey part side and rear extension, erection of a rear outrigger roof extension with increase in height of the chimney stack, installation of replacement double glazed windows to the house

  Refused Householder Extension Windows or glazing 16 docs
  Small domestic

• 17 THORNTON AVENUE, CHISWICK, LONDON, W4 1QE

  P/2021/2219 Submitted 27 May 2021 36m away

  Details submitted pursuant of Condition 6 (construction method statement) and 7 (construction management plan) following planning permission 01122/17/P1 dated 07/09/2020 for enlargement of existing basement including creation of a front light well, replacement of front rooflight and addition of railings to front roof gable.

  Granted Conditions Loft or dormer 6 docs

• 25A UPHAM PARK ROAD, CHISWICK, LONDON, W4 1PQ

  P/2021/2246 Submitted 4 Jun 2021 62m away

  Erection of a single storey rear infill extension to the ground floor flat

  Refused Full applications Extension 6 docs
  Small domestic

• 5 Thornton Avenue, Chiswick, London, W4 1QE

  P/2026/0156 Submitted 19 Jan 2026 66m away

  Erection of a single storey rear and side infill extension to the house.

  Granted Householder Extension 9 docs
  Small domestic

• P/2026/2010 Granted

  Granwood Court, 20 The Grove, Isleworth, TW7 4JX

  Variation of Condition 2 (Approved Plans) to remove the PVC cladding panels on the existing elevations and replace with render and changes to the windows within the third floor following planning permission P/2022/3520 approved 14/04/2023 erection of a third floor roof extension incorporating five self-contained flats with associated refuse and cycle parking provision.

  7 Jul 2026 Conditions
• P/2026/0078 Granted

  Buildings 29-37,MOD Feltham Site,Elmwood Avenue,Feltham,Middlesex,TW13 7AH

  Details submitted pursuant to Condition 5 (Construction Logistics Management Plan), Condition 16 (Watching Brief), Condition 17 (Invasive Species), Condition 19 (Biodiversity Net Gain), Condition 28 (Remediation Strategy), and Condition 32 (Bird Hazard Management Plan) of permission P/2024/0622 dated 31/10/2025 for Formation of a new school, erection of three new school buildings with main access from Browell's Lane, installation of a multi use games area, playing pitch, parking, landscaping and associated infrastructure following the demolition of the former MOD buildings.

  12 Jan 2026 Conditions
• P/2026/1558 Granted

  74 Dukes Avenue, Chiswick, London, W4 2AF

  Variation of condition 2 (approved plans) to allow the reduction in size of the outbuilding and the garden storage moved of planning permission P/2024/3412 approved 20/12/2024 for the erection of a single storey detached out building for use as paint studio in the rear garden

  22 May 2026 Conditions
• P/2026/2464 Awaiting decision

  Rivers Academy Tachbrook Road, Feltham, TW14 9PE

  Details of Condition 12 (School Access Strategy) submitted pursuant to permission P/2025/1059 dated 15/08/2025 for Erection of a three storey temporary school building and provision of temporary playing pitches on the school sports field.

  28 Aug 2026 Conditions
• P/2026/2453 Awaiting decision

  155 Chiswick High Road, Chiswick, London, W4 2DT

  Variation of Condition 9 ( Internal water usage) to the flats hereby approved, shall be fitted to ensure that the development would achieve the internal water usage of 105 litres per person per day target of planning permission P/2024/2338 approved 07/01/2025 for the conversion of the existing unit on the ground floor into two commercial units incorporating the conversion of the rear garage to commercial space. Erection of a two storey rear extension to facilitate the change of use of the existing commercial unit on the first and second floor into three self contained flats. Installation of one front and one side roof window, solar panels on the roof and side elevation windows.

  27 Aug 2026 Conditions