43 Arnold Crescent, Isleworth, TW7 7NS

1. 10 Apr 2026

   Received by Hounslow

2. 12 May 2026

   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

• 43 Arnold Crescent, Isleworth, TW7 7NS

  P/2026/1122 Submitted 10 Apr 2026 0m away

  Erection of a front porch extension to the house.

  Granted Householder Extension 6 docs
  Small domestic

• 72 Arnold Crescent, Isleworth, TW7 7NU

  P/2025/3702 Submitted 12 Dec 2025 53m 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 and removal of chimney.

  Granted Lawful development Extension Loft or dormer +1 9 docs

• 72 Arnold Crescent, Isleworth, TW7 7NU

  P/2026/0530 Submitted 13 Feb 2026 53m away

  Erection of a single storey side extension, single storey rear extension, front porch extension and rear roof extension with hip to gable conversion and three front roof windows following the demolition of the existing garage and conservatory.

  Refused Householder Extension Loft or dormer +2 12 docs
  Small domestic

• 57 ARNOLD CRESCENT, ISLEWORTH, TW7 7NS

  P/2021/2292 Submitted 8 Jun 2021 60m away

  Erection of a single storey front extension incorporating conversion of existing garage into habitable room.

  Refused Householder Extension 6 docs
  Small domestic

• 59 Arnold Crescent, Isleworth, TW7 7NS

  P/2025/3493 Submitted 20 Nov 2025 69m away

  Erection of a single storey front and single storey side and rear infill extension to convert the garage into a habitable room

  Granted Householder Extension 12 docs
  Small domestic

• 27 Arnold Crescent, Isleworth, TW7 7NS

  P/2024/3295 Submitted 2 Oct 2024 76m away

  Proposal for the erection of a hip to gable conversion, rear dormer and three roof windows

  Refused Householder Loft or dormer Windows or glazing 9 docs
  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