185 SYON LANE, ISLEWORTH, TW7 5PU

1. 22 Jul 2021

   Received by Hounslow

2. 27 Jul 2021

   Decision issued: REFUSED (FULL PLANNING PERMISSION REQUIRED)

3. 26 Jul 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.

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.

• 191 Syon Lane, Isleworth, TW7 5PU

  P/2026/1413 Submitted 11 May 2026 50 yards away

  Works to tree in a Conservation Area. Removal of 1 X Magnolia tree which is located within the boundary.

  Granted Trees 5 docs

• 5 Oaklands Avenue, Isleworth, TW7 5PX

  P/2026/1060 Submitted 31 Mar 2026 50 yards away

  Replacement of the existing black framed UPVC windows with white framed UPVC windows to the front elevation of the house

  Refused Householder Windows or glazing 7 docs
  Domestic

• 7 OAKLANDS AVENUE, ISLEWORTH, TW7 5PX

  P/2021/1563 Submitted 22 Apr 2021 50 yards away

  Erection of a single storey rear extension and addition of three windows on ground floor side elevation.

  Granted Householder Extension Windows or glazing 6 docs
  Small domestic

• 17 Crowntree Close, Isleworth, TW7 5PF

  P/2026/1455 Submitted 13 May 2026 100 yards away

  Erection of a single-storey side and rear infill extension, and a front porch extension.

  Granted Householder Extension 8 docs
  Small domestic

• 17 Crowntree Close, Isleworth, TW7 5PF

  P/2026/1437 Submitted 12 May 2026 100 yards away

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

  Granted Lawful development Extension Windows or glazing 7 docs

• 17 Crowntree Close, Isleworth, TW7 5PF

  P/2026/2151 Submitted 22 Jul 2026 100 yards away

  77% historically approved · decision due ~17 Sep

  Erection of a side roof extension with three roof windows on the other side of the house

  Awaiting decision Householder Extension Windows or glazing 7 docs
  Domestic

• P/2026/2118 Granted

  54 Amhurst Gardens, Isleworth, TW7 6AJ

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

  Received 20 Jul, published by the council 26 Jul 2026 Lawful development
• P/2026/2580 Awaiting decision

  50B Paxton Road, Chiswick, London, W4 2QX

  Certificate of lawfulness for the existing use of a first floor self contained flat.

  Received 10 Sep, published by the council 17 Sep 2026 Lawful development
• P/2026/2332 Granted

  43 Dawes Avenue, Isleworth, TW7 7JS

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

  Received 12 Aug, published by the council 16 Aug 2026 Lawful development
• P/2026/2089 Granted

  18 Central Avenue, Hounslow, TW3 2QH

  Certificate of lawfulness for the existing use of the rear extension as a self contained flat.

  Received 17 Jul, published by the council 26 Jul 2026 Lawful development
• P/2026/2566 Awaiting decision

  109 Wood Lane, Isleworth, TW7 5EG

  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.

  Received 9 Sep, published by the council 17 Sep 2026 Lawful development