20 Marlborough Road, Chiswick, London, W4 4ET

1. 17 Oct 2025

   Received by Hounslow

2. 12 Dec 2025

   Decision issued: APPROVED

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.

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

• 14 Marlborough Road, Chiswick, London, W4 4ET

  P/2026/1439 Submitted 12 May 2026 30m away

  Works to trees in a Conservation Area. T1. Magnolia. Front garden. Crown reduce by up to 2 metres and to previous reduction points T2. Birch. Rear garden. Crown reduce by 2 metres and to previous reduction points to contain spread. T3 Purple Leaf Plum. Rear garden. Crown reduce by up to 2.5 metres and to previous reduction points to contain crown spread T4 Evergreen Magnolia. Rear garden. Crown reduce by up to 2.5 metres. T5 Holly. Rear garden. Crown reduce by up to 2.5 metres

  Granted Trees 4 docs

• 12A MARLBOROUGH ROAD, CHISWICK, LONDON, W4 4ET

  P/2021/2832 Submitted 13 Jul 2021 35m away

  Rear garden T1 Pine x 1 (Pinus sp): Fell to ground level using advanced rigging techniques.

  Granted Trees 5 docs

• 13 Walpole Gardens, Chiswick, London, W4 4HG

  P/2025/2739 Submitted 10 Sep 2025 63m away

  Enlargement of existing rear roof extension and replacement of existing UPVC and timber framed windows for hardwood sash windows of the house

  Granted Householder Extension Windows or glazing 9 docs
  Domestic

• 7A Marlborough Road, Chiswick, London, W4 4EU

  P/2024/3884 Submitted 19 Nov 2024 77m away

  Works to two trees in rear garden in conservation area: T1 Common Apple reduce all round by 2-3 metres. T2 Bay reduce in height by 3-4 metres. Reduce laterally by 0.5-1 metres leaving a column shape

  Granted Trees 4 docs

• 29 BURLINGTON ROAD, CHISWICK, LONDON, W4 4BQ

  P/2019/3815 Submitted 22 Oct 2019 79m away

  Variation of condition 2 (approved plans) to allow the addition of a railing to the front low boundary wall of planning permission 00177/29/P8 approved 06/02/2018 for erection of a part single part two storey replacement rear extension with roof lanterns, enlargement of existing basement with two front, one side and two rear light wells, and side access stairwell, erection of two rear roof extensions with five roof lights, additional rear and side windows and side doors to the house

  Granted Full applications Extension Loft or dormer +1 5 docs
  Small domestic

• 2 Walpole Gardens, Chiswick, London, W4 4HG

  P/2026/1175 Submitted 16 Apr 2026 80m away

  Works to tree in a Conservation Area. T1. Common Lime. Reduce all aspects of the crown by approximately 1.5 metres below the previous points of reduction.

  Granted Trees 4 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