5 Thornton Avenue, Chiswick, London, W4 1QE

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

• P/2026/0347 Granted

  5 Thornton Avenue, Chiswick, London, W4 1QE

  Certificate of lawfulness for the proposed rear roof extension with one front roof window to the house.

  Decided 17 Mar 2026 Lawful development

1. 19 Jan 2026

   Received by Hounslow

2. 20 Apr 2026

   Decision issued: APPROVED

3. 12 Aug 2026

   Added to PlanIndex

Hounslow granted permission on 20 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.

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.

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

  P/2026/0347 Submitted 3 Feb 2026 50 yards away

  Certificate of lawfulness for the proposed rear roof extension with one front roof window to the house.

  Granted Lawful development Extension Windows or glazing 7 docs

• 4-6 THORNTON AVENUE, CHISWICK, LONDON, W4 1QG

  P/2021/3442 Submitted 24 Aug 2021 50 yards away

  Variation of condition 1 (Approved Plans) to propose a storage space beneath the front garden path following 01122/4-6/P2 dated 23/12/2020 for Variation of condition 2 (approved plans) to allow the increase in size of the basement to the front and with a front lightwell to No 4 of planning permission 01122/4-6/P1 approved 15/07/2014 for the Joint application for a change of use of No. 4 from 5 bedsits and 1 studio flat to a single family dwelling and erection of single storey rear and side infill extensions and formation of rear basement extension with lightwell to both No. 4 and No. 6.

  Granted Full applications Extension 9 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

• 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

• 132 Chiswick High Road, Chiswick, London, W4 1PU

  P/2025/3419 Submitted 14 Nov 2025 50 yards away

  Creation of an outdoor seating area with balustrade enclosure to the front of the restaurant with alterations to two of the six front panels to existing shopfront.

  Refused Full applications Windows or glazing 29 docs

• 12 Mayfield Avenue, Chiswick, London, W4 1PW

  P/2024/3733 Submitted 9 Nov 2024 50 yards away

  Erection of a single storey rear extension.

  Granted Householder Extension 14 docs
  Small domestic

• P/2026/2304 Granted

  18 Clifden Road, Brentford, TW8 0PF

  Erection of a side and rear extensions.

  Received 7 Aug, published by the council 12 Aug 2026 Householder
• P/2026/2804 Awaiting decision

  128 Durham Road, Feltham, TW14 0AE

  Erection of a detached outbuilding in the rear garden following demolition of existing shed.

  Received 2 Oct, published by the council 9 Oct 2026 Householder
• P/2026/2301 Granted

  4 Glebe Street, Chiswick, W4 2BG

  Erection of a front side and rear side infill extensions with alterations to the rear elevation, a rear side first floor infill extension with replacement of windows to the rear elevation and installation of new rooflights to the existing ground floor infill extension of the house

  Received 7 Aug, published by the council 16 Aug 2026 Householder
• P/2026/1167 Granted

  20 Firs Drive, Hounslow, TW5 9TD

  Erection of part one, part two-storey side extension following demolition of existing garage and part one, part two-storey rear extension. Raising of roof ridge, erection of rear roof extensions, and installation of one front roof window.

  Received 15 Apr, published by the council 26 Jul 2026 Householder
• P/2026/2025 Granted

  1 Kneller Gardens, Isleworth, TW7 7NP

  Erection of a single storey rear and first floor side extension incorporating the conversion of the existing garage to a habitable room

  Received 8 Jul, published by the council 26 Jul 2026 Householder