21 NORTHUMBERLAND AVENUE, ISLEWORTH, TW7 5HZ

1. 10 Feb 2023

   Received by Hounslow

2. 14 Feb 2023

   Validated

   Checked as complete and ready for consideration.

3. 11 Apr 2023

   Decision issued: REFUSED PLANNING PERMISSION

4. 23 Aug 2026

   Added to PlanIndex

Hounslow refused this application for the reasons on the decision notice; only the applicant can appeal, and refused schemes often return in revised form. 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.

• 17 Northumberland Avenue, Isleworth, TW7 5HZ

  P/2026/2631 Submitted 15 Sep 2026 50 yards away

  100% historically approved · decision due ~10 Nov

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

  Awaiting decision Lawful development Extension Windows or glazing 5 docs

• 21 CAMPION ROAD, ISLEWORTH, TW7 5HS

  P/2021/2890 Submitted 15 Jul 2021 50 yards away

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

  Granted Householder Extension 7 docs
  Small domestic

• 3 Downs View, Isleworth, TW7 5HF

  P/2024/3116 Submitted 17 Sep 2024 100 yards away

  Erection of a single storey rear wrap-around extension and conversion of the existing garage into a habitable space.

  Granted Householder Extension 26 docs
  Small domestic

• 31 ALBURY AVENUE, ISLEWORTH, TW7 5HY

  P/2021/1211 Submitted 26 Mar 2021 100 yards away

  Erection of a single storey rear extension.

  Refused Householder Extension 7 docs
  Small domestic

• 23 Downs View, Isleworth, TW7 5HF

  P/2024/3516 Submitted 22 Oct 2024 100 yards away

  Certificate of lawfulness for a hip to gable conversion and erection of a rear roof extension with three front roof windows to the house

  Granted Lawful development Extension Loft or dormer +1 7 docs

• 23 Downs View, Isleworth, TW7 5HF

  P/2025/2500 Submitted 12 Aug 2025 100 yards away

  Erection of a single storey ground floor side extension and part rear infill extension to the house. Following the demolition of the garage.

  Withdrawn Householder Extension Demolition 6 docs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