38 Mandeville Road, Isleworth, TW7 6AD

1. 23 Sep 2026

   Received by Hounslow

2. 29 Sep 2026

   Validated

   Checked as complete and ready for consideration.

3. 6 Oct 2026

   Added to PlanIndex

4. Decision

   Awaiting decision

   Decision expected by 24 November 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.

This application is with Hounslow for determination, against a statutory target of eight weeks. Over the last year Hounslow decided householder applications in a median of 63 days. More in our guide to how long planning decisions take.

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.

• 29 SMALLBERRY AVENUE, ISLEWORTH, TW7 6QL

  P/2023/0229 Submitted 24 Jan 2023 50 yards away

  Erection of single storey side and rear wrap around extension to the house.

  Granted Householder Extension 9 docs
  Small domestic

• 16 MANDEVILLE ROAD, ISLEWORTH, TW7 6AD

  P/2023/0740 Submitted 7 Mar 2023 100 yards away

  Certificate of Lawfulness for the use of an outbuilding as an office within the rear garden of the house.

  Refused Lawful development 12 docs

• 41 Smallberry Avenue, Isleworth, TW7 6QL

  P/2024/3066 Submitted 13 Sep 2024 100 yards away

  Retrospective planning application for the erection of a part single storey rear extension following the demolition of the existing shed

  Granted Householder Extension Demolition 6 docs
  Small domestic

• 41 Smallberry Avenue, Isleworth, TW7 6QL

  P/2025/3234 Submitted 27 Oct 2025 100 yards away

  Conversion of the existing single family house into two residential houses and formation of a vehicular access on the public pathway with associated car parking, cycle and refuse storage.

  Refused Full applications 16 docs

• 151 Linkfield Road, Isleworth, TW7 6QN

  P/2026/1097 Submitted 7 Apr 2026 150 yards away

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

  Granted Householder Extension 9 docs
  Small domestic

• 151 Linkfield Road, Isleworth, TW7 6QN

  P/2026/1094 Submitted 6 Apr 2026 150 yards away

  Certificate of lawfulness for the proposed erection of a rear roof and outrigger extension and front roof windows to the house.

  Granted Lawful development Extension Windows or glazing 13 docs

• 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