20 Chestnut Grove, Isleworth, TW7 7EZ

1. 3 Feb 2026

   Received by Hounslow

2. 12 Feb 2026

   Validated

   Checked as complete and ready for consideration.

3. 25 Feb 2026

   Decision issued: GRANT

4. 12 Aug 2026

   Added to PlanIndex

Hounslow granted permission on 25 February 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.

A lawful development certificate is a legal determination that existing or proposed works do not need planning permission; the merits of the scheme are not considered. More in our guide to planning application types.

• 18 CHESTNUT GROVE, ISLEWORTH, TW7 7EZ

  PA/2023/0325 Submitted 1 Feb 2023 50 yards away

  Ground floor rear extension 6.00 metres deep, maximum height 4.00 metres, 3.00 metres high to the eaves

  Refused Prior approval Extension 5 docs

• 33 Chestnut Grove, Isleworth, TW7 7HA

  PA/2026/1038 Submitted 30 Mar 2026 50 yards away

  Ground floor rear extension 5.00 metres deep, maximum height of 3.00 metres, 3.00 metres high to the eaves

  Granted Prior approval Extension 5 docs

• 4 Chestnut Grove, Isleworth, TW7 7EZ

  P/2026/1565 Submitted 26 May 2026 50 yards away

  Erection of single storey side and rear extension to the house. Following the demolition of existing rear extension.

  Granted Householder Extension Demolition 9 docs
  Small domestic

• 11 Chestnut Grove, Isleworth, TW7 7HA

  P/2026/0236 Submitted 26 Jan 2026 50 yards away

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

  Granted Lawful development Extension Loft or dormer +1 7 docs

• 2A Cleveland Road, Isleworth, TW7 7EY

  P/2026/0774 Submitted 6 Mar 2026 100 yards away

  Raising of roof ridge, erection of a rear roof extension with hip to gable conversion to both side of the roof and two front roof windows to the house.

  Granted Householder Extension Loft or dormer +1 9 docs
  Domestic

• 2A Cleveland Road, Isleworth, TW7 7EY

  P/2026/0753 Submitted 5 Mar 2026 100 yards away

  Certificate of lawfulness for the proposed erection of a single storey rear extension to the house.

  Granted Lawful development Extension 9 docs
  Small domestic

• P/2026/2813 Awaiting decision

  150 Wood Lane, Isleworth, TW7 5EQ

  (GSGS877009741) Certificate of lawfulness proposed for the erection of a single storey outbuilding to be used as a home gym / playroom / shed in the rear garden of the house

  Received 5 Oct, published by the council 9 Oct 2026 Lawful development
• P/2026/2334 Granted

  69 Central Avenue, Hounslow, TW3 2QW

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

  Received 12 Aug, published by the council 16 Aug 2026 Lawful development
• P/2026/2459 Granted

  2 Letchworth Avenue, Feltham, TW14 9RY

  Certificate of Lawfulness for the proposed hip to gable roof conversion, installation of two front roof windows, and erection of a rear roof extension to the existing house.

  Received 28 Aug, published by the council 5 Sep 2026 Lawful development
• P/2026/2787 Awaiting decision

  13 Denbigh Road, Hounslow, TW3 4DU

  Certificate of Lawfulness for the proposed erection of a detached outbuilding in the rear garden.

  Received 1 Oct, published by the council 9 Oct 2026 Lawful development
• P/2026/2790 Awaiting decision

  14 Old Farm Close, Hounslow, TW4 7AB

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

  Received 1 Oct, published by the council 6 Oct 2026 Lawful development