26 Thornton Avenue, Chiswick, London, W4 1QG

This site has had 2 applications since 2026: 2 approved, 0 refused.

• P/2026/1399 Granted

  26 Thornton Avenue,Chiswick,London,W4 1QG

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

  Decided 3 Jul 2026 Lawful development

1. 21 Jan 2026

   Received by Hounslow

2. 28 Jan 2026

   Validated

   Checked as complete and ready for consideration.

3. 9 Apr 2026

   Decision issued: APPROVED

4. 12 Aug 2026

   Added to PlanIndex

1 later application on the register refers to this one:

• P/2026/2358 Awaiting decision

  26 Thornton Avenue,Chiswick,W4 1QG

  Details of Condition 5 (Construction Logistics Plan) submitted pursuant to permission P/2026/0194 dated 09/04/2026 for 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.

  Submitted 14 Aug 2026 Conditions

Hounslow granted permission on 9 April 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 full application seeks permission for a complete, detailed proposal in one go, with siting, design, access and landscaping all fixed at this stage. More in our guide to planning application types.

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

  P/2026/1399 Submitted 8 May 2026 50 yards 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

• 26 Thornton Avenue,Chiswick,W4 1QG

  P/2026/2358 Submitted 14 Aug 2026 50 yards away

  89% historically approved · decision due ~9 Oct

  Details of Condition 5 (Construction Logistics Plan) submitted pursuant to permission P/2026/0194 dated 09/04/2026 for 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.

  Awaiting decision Conditions New dwelling Extension +1 3 docs
  Small domestic

• 28 THORNTON AVENUE, CHISWICK, W4 1QG

  P/2022/4025 Submitted 16 Dec 2022 50 yards away

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

  Granted Householder Extension 10 docs
  Small domestic

• 22 THORNTON AVENUE, CHISWICK, W4 1QG

  P/2019/3933 Submitted 29 Oct 2019 50 yards 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 50 yards 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 50 yards away

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

  Refused Full applications Extension 6 docs
  Small domestic

• P/2026/1916 Granted

  Police Station, 34 Hanworth Road, Feltham, TW13 5BD

  Replacement of existing vehicular and pedestrian gate with associated new control pedestals, new fencing and posts.

  Received 29 Jun, published by the council 26 Jul 2026 Full applications
• P/2026/2212 Granted

  190 Jersey Road, Isleworth, TW7 4QN

  Change of use of the existing House in Multiple Occupation (Use Class C4) occupied by up to six persons to a large House in Multiple Occupation (Sui Generis) occupied by up to eight persons, with no internal changes.

  Received 29 Jul, published by the council 5 Aug 2026 Full applications
• P/2026/1676 Granted

  Clayponds Open Space, Clayponds Gardens, London, W5 4RQ

  Replacement of ball court (MUGA) to a football foundation play zone, installation of new fencing, lighting and associated equipment

  Received 4 Jun, published by the council 26 Jul 2026 Full applications
• P/2026/2806 Awaiting decision

  COST CHOICE, UNIT 5, HIGH STREET, BRENTFORD,TW8 8LB

  Installation of ATM machine to the shopfront..

  Received 30 Sep, published by the council 6 Oct 2026 Full applications
• P/2026/1648 Refused

  Heathrow House, 785 Bath Road, Hounslow, TW5 9AT

  Change of use from 20 residential apartments (14 x one-bedroom and 6 x two-bedroom) to serviced accommodation across three floors 2,3 and 4 of the building.

  Received 3 Jun, published by the council 26 Jul 2026 Full applications