6 Alton Close, Isleworth, TW7 6AL

1. 23 Sep 2025

   Received by Hounslow

2. 21 Oct 2025

   Decision issued: GRANT

3. 12 Aug 2026

   Added to PlanIndex

Permission has been granted, usually subject to conditions listed on the decision notice, some of which must be discharged before work starts. The decision notice on the council portal sets out exactly what was approved.

Work must normally begin within three years of the decision or the permission lapses. Neighbours cannot appeal a grant; challenging one means judicial review of how the decision was made, within tight time limits.

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

• 6 Alton Close, Isleworth, TW7 6AL

  P/2025/0931 Submitted 24 Mar 2025 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.

  Withdrawn Lawful development Extension Loft or dormer +1 20 docs

• 6 Alton Close, Isleworth, TW7 6AL

  P/2026/1209 Submitted 20 Apr 2026 0m away

  Certificate of lawfulness for the proposed erection of a single storey detached outbuilding for use as an office and a front porch extension to the house.

  Granted Lawful development Extension 18 docs
  Small domestic

• 6 Alton Close, Isleworth, TW7 6AL

  P/2025/3026 Submitted 8 Oct 2025 0m away

  Erection of a single storey rear extension and removal of chimney stack to the house.

  Granted Householder Extension 19 docs
  Small domestic

• 8 Alton Close, Isleworth, TW7 6AL

  P/2024/3818 Submitted 15 Nov 2024 9m away

  Certificate of Lawfulness for the proposed erection of a single storey detached outbuilding as an office in rear garden.

  Granted Lawful development 5 docs
  Small domestic

• 20 AMHURST GARDENS, ISLEWORTH, TW7 6AJ

  PA/2019/4025 Submitted 6 Nov 2019 40m away

  Ground floor rear extension 6 metres deep, maximum height of 2.9 metres, 2.4 metres high to the eaves

  Granted Prior approval Extension 9 docs

• Land Rear of 26-48 & 34 Amhurst Gardens, Isleworth TW7 6AJ

  P/2026/1136 Submitted 13 Apr 2026 48m away

  Details of Conditions 6 (Construction Logistics Plan) submitted pursuant to planning permission P/2025/0430 dated 28/11/2025 for Erection of eight houses with an associated access road, private parking, amenity space, landscaping, cycle and bin stores following the demolition of 34 Amhurst Gardens

  Granted Conditions Demolition 15 docs
  Several homes

• 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