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 56 days over the applications it decided in the last year.

• P/2026/0194 Granted

  26 Thornton Avenue, Chiswick, London, W4 1QG

  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.

  Decided 9 Apr 2026 Full applications

This application is with Hounslow for determination, against a statutory target of eight weeks. Over the last year Hounslow decided condition discharge and variation applications in a median of 59 days. More in our guide to how long planning decisions take.

This application deals with conditions on an existing permission, supplying the details a condition requires or asking to vary or remove one, without reopening the permission itself. More in our guide to planning application types.

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

  P/2026/0194 Submitted 21 Jan 2026 50 yards 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 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

• 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/2026/2537 Granted

  LAND AT UPS HOUSE FOREST ROAD, FELTHAM, TW13 7DY

  Details of Part B of Condition 26 (EV Charging Points) submitted pursuant to permission P/2023/2176 dated 12/11/2024 for Redevelopment of the Site to provide six industrial units (Class E(g)(iii) / B2 / B8) accommodating 6,286 sqm employment floor space with associated landscaping, drainage, access and other works following the demolition of the existing buildings on the Site

  Received 7 Sep, published by the council 10 Sep 2026 Conditions
• P/2026/0968 Granted

  U P S House, Forest Road, Feltham, TW13 7DY

  Details of condition 28 (Servicing and Delivery Plan) submitted pursuant to planning permission P/2023/2176 dated 12/11/2024 for Redevelopment of the Site to provide six industrial units (Class E(g)(iii) / B2 / B8) accommodating 6,286 sqm employment floor space with associated landscaping, drainage, access and other works following the demolition of the existing buildings on the Site

  Received 25 Mar, published by the council 26 Jul 2026 Conditions
• P/2026/2173 Granted

  Land Rear of 26-48 & 34 Amhurst Gardens, Isleworth,TW7 6AJ

  Details of Conditions 5 (Hard and Soft Landscaping), 9 (Boundary Treatment) and 22 (Stage 1 Written Scheme of Investigation (WSI)) submitted pursuant to planning permission P/2025/0430 dated 28/11/2025 for erection of eight houses with an associated access road, private parking, amenity space, landscaping, cycle and bin stores following the demolition of 34 Amhurst Gardens

  Received 27 Jul, published by the council 30 Jul 2026 Conditions
• P/2026/2302 Granted

  17 Greencroft Road, Hounslow, TW5 0BQ

  Details of Condition 2 (Clothes drying area) submitted pursuant to planning permission P/2025/3107 approved on appeal (Appeal Ref: 6004619) dated 24/06/2026 for the retrospective planning application for change of use from a single family house (Use Class C3) to a House in Multiple Occupation (HMO) for up to six people (Use Class C4)

  Received 7 Aug, published by the council 12 Aug 2026 Conditions
• P/2026/2276 Refused

  Hanworth Trading Estate, Unit 1,Hampton Road West,Feltham,TW13 6DH

  Details of Condition 5 (Construction Logistics Plan) and condition 6 (cycle stands) submitted pursuant to permission P/2025/2585 dated 28/04/2026 for Change of use from Car Storage, use Class B8, to Open Self Storage, use Class B8, and the siting of 382 storage containers.

  Received 4 Aug, published by the council 12 Aug 2026 Conditions