42 Cambridge Road, Hounslow, TW4 7BS

1. 13 Nov 2025

   Received by Hounslow

2. 4 Dec 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

• 20 CAMBRIDGE ROAD, HOUNSLOW, TW4 7BS

  P/2019/3874 Submitted 25 Oct 2019 75m away

  Certificate of Lawfulness for the erection of a hip to gable and rear roof extension with two front roof windows to the house

  Withdrawn Lawful development Extension Loft or dormer +1 4 docs

• 78 CAMBRIDGE ROAD, HOUNSLOW, TW4 7BH

  P/2023/0191 Submitted 19 Jan 2023 88m away

  Erection of a single storey side and rear extension to the existing detached outbuilding

  Granted Householder Extension 9 docs
  Small domestic

• 17 THE GREENWAY, HOUNSLOW, TW4 7AJ

  P/2021/2632 Submitted 28 Jun 2021 94m away

  Erection of a single storey rear extension to the house

  Granted Householder Extension 7 docs
  Small domestic

• 17 Ashton Gardens, Hounslow, TW4 7BU

  P/2026/1223 Submitted 21 Apr 2026 95m away

  Erection of a front proch extension and single storey rear extension to the existing house. Formation of a vehicular access. Erection of a two storey house with associated amenity space, car parking, cycle and refuse storage.

  Refused Full applications Extension 20 docs
  Small domestic

• 15 THE GREENWAY, HOUNSLOW, TW4 7AJ

  PA/2021/2906 Submitted 16 Jul 2021 100m away

  Ground floor rear extension 6.00 metres deep, maximum height 3.80 metres, 2.60 metres high to the eaves

  Granted Prior approval Extension 4 docs

• 25 Cambridge Road, Hounslow, TW4 7BT

  P/2025/3685 Submitted 11 Dec 2025 121m away

  Retrospective application for the erection of a two-storey side extension, part first floor rear extension and a single storey rear extension to the house.

  Granted Householder Extension 6 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