5 Cornwall Grove, Chiswick, London, W4 2LB

1. 13 Feb 2026

   Received by Hounslow

2. 17 Mar 2026

   Validated

   Checked as complete and ready for consideration.

3. 29 Apr 2026

   Decision issued: APPROVED

4. 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.

Householder applications cover work to an existing house and its garden: extensions, loft and garage conversions, porches, outbuildings and similar alterations within the boundary of the home. They cannot be used to create a separate dwelling or change what the building is used for. Councils aim to decide them within eight weeks, and immediate neighbours are usually notified and given a chance to comment.

More on householder applications in our guide

• 17 Cornwall Grove, Chiswick, London, W4 2LB

  P/2026/0026 Submitted 7 Jan 2026 30m away

  Erection of a single storey rear and infill extension following the demolition of the existing rear and infill extension to the house

  Granted Householder Extension Demolition 10 docs
  Small domestic

• 26 Cornwall Grove, Chiswick, London, W4 2LB

  P/2026/1686 Submitted 8 Jun 2026 62m away

  Erection of a single storey part side and rear extension to the ground floor flat.

  Granted Full applications Extension 16 docs
  Small domestic

• 26 Cornwall Grove, Chiswick, London, W4 2LB

  P/2026/1053 Submitted 31 Mar 2026 62m away

  Erection of a part side infill and rear extension to the ground floor flat.

  Refused Full applications Extension 11 docs

• Flat Ground Floor, 28 Cornwall Grove, Chiswick, London, W4 2LB

  P/2026/0554 Submitted 16 Feb 2026 67m away

  Erection of a single storey rear extension to the ground floor flat.

  Granted Full applications Extension 10 docs
  Small domestic

• 24 Balfern Grove, Chiswick, London, W4 2JX

  P/2026/0330 Submitted 3 Feb 2026 72m away

  Certificate of lawfulness for the proposed outrigger roof extension to the house

  Granted Lawful development Extension 11 docs

• FLAT FIRST FLOOR 33 BALFERN GROVE, CHISWICK, W4 2JX

  P/2019/3915 Submitted 29 Oct 2019 76m away

  Certificate of Lawfulness for erection of a rear roof extension to outrigger of first floor flat

  Refused Lawful development Extension 8 docs

• P/2026/2047 Granted

  9 Borough Road, Isleworth, TW7 5DY

  Erection of a single storey rear extension.

  10 Jul 2026 Householder
• P/2026/1858 Granted

  8 CONNAUGHT AVENUE, HOUNSLOW, TW4 5BW

  Erection of single storey front extension to the outbuilding for used as storage, office and a Gym. Following part demolition of the outbuilding.

  23 Jun 2026 Householder
• P/2026/2503 Awaiting decision

  25 Arnold Crescent, Isleworth, TW7 7NS

  Erection of a single storey rear, two storey side extension, and rear roof extension with two front roof windows to the house.

  3 Sep 2026 Householder
• P/2026/1522 Granted

  4 Camborne Way, Hounslow, TW5 0PW

  Erection of a single storey rear extension and reduction in width of the existing side and rear extension.

  20 May 2026 Householder
• P/2026/2024 Granted

  20 Hartland Road, Isleworth, TW7 6RH

  Erection of a rear roof extension with windows to the front of the house.

  8 Jul 2026 Householder