115 Roxborough Avenue, Isleworth, TW7 5HH

This site has had 2 applications since 2026: 1 approved, 0 refused.

• P/2026/1372 Granted

  115 Roxborough Avenue, Isleworth, TW7 5HH

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

  Decided 1 Jul 2026 Lawful development

1. 1 Sep 2026

   Received by Hounslow

2. 3 Sep 2026

   Validated

   Checked as complete and ready for consideration.

3. 10 Sep 2026

   Added to PlanIndex

4. Decision

   Awaiting decision

   Decision expected by 29 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.

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.

• 115 Roxborough Avenue, Isleworth, TW7 5HH

  P/2026/1372 Submitted 6 May 2026 0m away

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

  Granted Lawful development Extension Loft or dormer +1 8 docs

• 109 ROXBOROUGH AVENUE, ISLEWORTH, TW7 5HH

  P/2021/2808 Submitted 9 Jul 2021 28m away

  Erection of a single storey rear infill extension.

  Granted Householder Extension 5 docs
  Small domestic

• 109 Wood Lane, Isleworth, TW7 5EG

  P/2026/2566 Submitted 9 Sep 2026 78m away

  100% historically approved · decision due ~6 Nov

  Certificate of lawfulness for the proposed erection of a rear roof extension with hip to gable conversion with roof windows to the front and Juliet balcony to the rear of the house.

  Awaiting decision Lawful development Extension Loft or dormer +1 4 docs

• 74 ROXBOROUGH AVENUE, ISLEWORTH, TW7 5HJ

  P/2021/3310 Submitted 16 Aug 2021 111m away

  Certificate of Lawfulness for the proposed erection of a rear roof extension incorporating hip to gable conversion, two front roof windows, one second floor side window and conversion of existing garage into habitable room with removal of front shutter and replace with windows to the house.

  Granted Lawful development Extension Loft or dormer +1 5 docs

• 91 Wood Lane, Isleworth, TW7 5EG

  P/2025/2883 Submitted 25 Sep 2025 122m away

  Certificate of lawfulness for the proposed erection of a rear roof extension with hip to gable conversion, juliet balcony and front roof windows to the house.

  Granted Lawful development Extension Loft or dormer +1 9 docs

• 60 Harewood Road, Isleworth, TW7 5HL

  P/2026/0128 Submitted 15 Jan 2026 150m away

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

  Granted Lawful development Extension Loft or dormer +1 4 docs

• P/2026/2623 Awaiting decision

  8 Lonsdale Road,Chiswick,W4 1ND

  Installation of external condenser at first floor level.

  15 Sep 2026 Householder
• P/2026/2125 Granted

  36 Midsummer Avenue, Hounslow, TW4 5BB

  Erection of a single storey rear extension and a single storey side extension following the demolition of the existing side garage.

  21 Jul 2026 Householder
• P/2026/2615 Awaiting decision

  48 Meadow Waye, Hounslow, TW5 9EZ

  Erection of a part first floor rear extension.

  14 Sep 2026 Householder
• P/2026/2619 Awaiting decision

  12 Letchworth Avenue, Feltham, TW14 9RY

  Erection of a single storey rear extension.

  14 Sep 2026 Householder
• P/2026/2600 Awaiting decision

  310 Lionel Road North, Brentford, TW8 9QX

  Erection of a rear roof extension.

  14 Sep 2026 Householder