26 Thornton Avenue, Chiswick, London, W4 1QG

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

Permission has been granted, usually subject to conditions listed on the decision notice, some of which must be discharged before work starts. The decision notice on the council portal sets out exactly what was approved.

Work must normally begin within three years of the decision or the permission lapses. Neighbours cannot appeal a grant; challenging one means judicial review of how the decision was made, within tight time limits.

A full application seeks permission for a complete, detailed proposal in one go: siting, design, access and landscaping are all fixed at this stage. It is the standard route for new buildings, conversions and changes of use. The statutory target is eight weeks for smaller schemes and thirteen weeks for major development, though complex cases often take longer by agreement.

More on full applications applications in our guide

• 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

• 26 Thornton Avenue,Chiswick,W4 1QG

  P/2026/2358 Submitted 14 Aug 2026 0m away

  91% 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

• 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/2026/1189 Granted

  12 The Grove, Isleworth, TW7 4JZ

  Installation of one front boundary gate and new windows to allow the conversion of existing single family house to five self contained flats with associated refuse and cycle storage.

  17 Apr 2026 Full applications
• P/2026/1937 Granted

  Flat Ground Floor, 102 New Heston Road, Hounslow, TW5 0LF

  Erection of a single storey detached outbuilding for use as a home office in the rear garden of the flat

  30 Jun 2026 Full applications
• P/2026/1494 Granted

  2 Bath Road, Chiswick, London, W4 1LW

  Demolition of the single-storey rear extension, installation of temporary scaffolding to the façade of the building, installation of associated plant equipment, an external condenser unit and acoustic shelter. Internal layout alterations and installation of secondary glazing, external alterations including re-rendering to allow continued use under Class E (c) and (g)(i)

  6 May 2026 Full applications
• P/2026/1936 Refused

  Flat First Floor, 102 New Heston Road, Hounslow, TW5 0LF

  Erection of a rear roof and outrigger extension with two front rooflights to the flat

  30 Jun 2026 Full applications
• P/2026/0592 Granted

  87 Cranleigh Road, Feltham, TW13 4QA

  Erection of a two storey residential house with associated landscaping, private amenity space, cycle and refuse storage.

  19 Feb 2026 Full applications