86 Kneller Gardens, Isleworth, TW7 7NW

1. 25 Aug 2026

   Received by Hounslow

2. 26 Aug 2026

   Added to PlanIndex

3. Decision

   Awaiting decision

   Decision expected by 20 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

• 72 Kneller Gardens, Isleworth, TW7 7NW

  PA/2026/2246 Submitted 3 Aug 2026 46m away

  91% historically approved · decision due ~28 Sep

  Ground floor rear extension 6.00 metres deep, maximum height of 2.90 metres, 2.90 metres high to the eaves

  Awaiting decision Prior approval Extension 4 docs

• 72 Kneller Gardens, Isleworth, TW7 7NW

  P/2026/2105 Submitted 20 Jul 2026 46m away

  100% historically approved · decision due ~14 Sep

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

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

• 393 Whitton Dene, Isleworth, TW7 7NF

  P/2026/0943 Submitted 22 Mar 2026 52m away

  Erection of a detached garage in the rear garden.

  Refused Householder 7 docs
  Domestic

• 70 KNELLER GARDENS, ISLEWORTH, HOUNSLOW, TW7 7NW

  P/2021/2382 Submitted 14 Jun 2021 52m away

  Works to Crab Apple Tree comprising of cutting overhanging branches back to boundary within TPO 618

  Refused Trees 9 docs

• 389 Whitton Dene,Isleworth,Hounslow,TW7 7NF

  P/2026/0389 Submitted 9 Feb 2026 55m away

  Formation of a vehicular access to the public pathway.

  Granted Full applications 9 docs

• 3 Kneller Gardens Isleworth TW7 7NP

  PA26/0878 Submitted 11 Mar 2026 85m away

  Erection of a single storey detached outbuilding in rear garden of house (P/2026/0765).

  Granted Outline 2 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