42 College Road, Isleworth, TW7 5DW

1. 27 Aug 2026

   Received by Hounslow

2. 2 Sep 2026

   Added to PlanIndex

3. Decision

   Awaiting decision

   Decision expected by 22 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 55 days over the applications it decided in the last year.

This application is with Hounslow for determination. The council publicises it, consults neighbours and technical bodies where required, and weighs the responses against local and national planning policy.

The statutory target is eight weeks for most applications and thirteen for major development, though extensions of time are common. Comments carry most weight while the case is undecided, so check the council portal for the deadline if you want to respond.

A lawful development certificate is a legal determination, not a planning judgement. It asks the council to confirm either that existing use or works are lawful, often through the passage of time, or that a proposal would not need planning permission at all. The applicant must prove the facts; the merits of the scheme are not considered.

More on lawful development applications in our guide

• 42 College Road, Isleworth, TW7 5DW

  P/2026/0773 Submitted 6 Mar 2026 0m away

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

  Granted Householder Extension 12 docs
  Small domestic

• 42 COLLEGE ROAD, ISLEWORTH, TW7 5DW

  P/2021/2330 Submitted 9 Jun 2021 0m away

  Erection of a rear roof extension with juliet balcony and two front roof windows.

  Granted Householder Extension Windows or glazing 10 docs
  Domestic

• 48 College Road, Isleworth, TW7 5DW

  P/2026/1417 Submitted 11 May 2026 19m away

  Works to hedge in a Conservation Area. Griselinia hedge located in garden. Fell to ground level.

  Granted Trees 4 docs

• 71 College Road, Isleworth, TW7 5DP

  P/2026/0261 Submitted 28 Jan 2026 39m away

  Erection of a first floor upwards extension, single storey rear and front porch extension to allow the conversion of the existing single family house to three self contained flats with associated car parking, cycle and refuse storage.

  Refused Full applications New dwelling Extension 17 docs
  Small domestic

• 28 COLLEGE ROAD, ISLEWORTH, TW7 5DW

  P/2021/1962 Submitted 18 May 2021 48m away

  Erection of a single storey rear extension and a side roof dormer with a front and sde roof window to the house

  Refused Householder Extension Loft or dormer +1 20 docs
  Small domestic

• 45 College Road, Isleworth, TW7 5DL

  P/2026/0019 Submitted 6 Jan 2026 49m away

  Erection of a single storey rear extension to the house, with the existing detached garage incorporated and converted to form a bedroom, replacement of garage door with a window.

  Granted Householder Extension Windows or glazing 13 docs
  Small domestic

• P/2026/2033 Granted

  3 Benedict Drive, Feltham, TW14 8JH

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

  8 Jul 2026 Lawful development
• P/2026/2027 Granted

  115 Northumberland Crescent, Feltham, TW14 9SP

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

  8 Jul 2026 Lawful development
• P/2026/2009 Granted

  3 Brainton Avenue, Feltham, TW14 0AZ

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

  7 Jul 2026 Lawful development
• P/2026/2014 Granted

  82 Sussex Avenue, Isleworth, TW7 6LB

  Certificate of lawfulness for the proposed erection of a rear roof extension, a porch to the front of the house, and a front roof window.

  7 Jul 2026 Lawful development
• P/2026/2473 Awaiting decision

  16 Somerset Waye, Hounslow, TW5 9HG

  Certificate of lawfulness for the proposed erection of a rear roof extension with two roof windows to the front and alterations to the existing side roof from flat roof to pitched roof.

  1 Sep 2026 Lawful development