117 Northumberland Crescent, Feltham, TW14 9SP

1. 18 Nov 2025

   Received by Hounslow

2. 9 Jan 2026

   Decision issued: LAWFNOTGRANT

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

• 115 Northumberland Crescent, Feltham, TW14 9SP

  P/2026/2027 Submitted 8 Jul 2026 7m away

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

  Granted Lawful development Extension Windows or glazing 8 docs

• 115 Northumberland Crescent, Feltham, TW14 9SP

  PA/2026/2028 Submitted 8 Jul 2026 7m away

  Ground floor rear extension 6.00 metres deep, maximum height 3.00 metres, 2.70 metres high to the eaves.

  Granted Prior approval Extension 7 docs

• 108 Northumberland Crescent, Feltham, TW14 9SW

  PA/2026/0817 Submitted 11 Mar 2026 96m away

  Ground floor rear extension 6.00 metres deep, maximum height of 3.40 metres, 2.90 metres high to the eaves

  Granted Prior approval Extension 5 docs

• 42 NORTHUMBERLAND CRESCENT, FELTHAM, TW14 9SZ

  PA/2021/2708 Submitted 2 Jul 2021 143m away

  Ground floor rear extension 6 metres deep, maximum height of 3 metres, 2.40 metres high to the eaves

  Granted Prior approval Extension 7 docs

• 62 New Road, Bedfont, TW14 8HT

  P/2025/2493 Submitted 12 Aug 2025 147m away

  Erection of single-storey rear extension to the house and conversion of the existing garage to habitable accommodation.

  Granted Householder Extension 5 docs
  Small domestic

• 2 HAZELMERE CLOSE, FELTHAM, TW14 9PX

  P/2023/0335 Submitted 2 Feb 2023 163m away

  Erection of a single storey side, part first floor side, rear roof extension with a hip to gable conversion and a single storey side porch extension following the demolition of the existing garage

  Withdrawn Householder Extension Loft or dormer +1 4 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