Second Floor Flat, Thames Works, Church Street, Chiswick, London,W4 2PD

1. 17 Nov 2025

   Received by Hounslow

2. 20 Nov 2025

   Validated

   Checked as complete and ready for consideration.

3. 4 Feb 2026

   Decision issued: GRANT

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.

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

• Thames Works, Unit 1, Church Street, Chiswick W4 2PD

  PAC/2025/3146 Submitted 20 Oct 2025 0m away

  Prior Approval for the change of use of the existing offices (Class E) into residential use (Class C3) compromising of three self contained flats with associated cycle and refuse storage.

  Granted Outline New dwelling 12 docs

• Flat 5 The Barley Store, Lamb Brewery Studios Church Street, Chiswick, London, W4 2PD

  P/2026/0350 Submitted 4 Feb 2026 2m away

  Replacing the existing single glazed window to double glazed window to the rear elevation of flat 5.

  Granted Full applications Windows or glazing 13 docs

• Thames Works, Church Street, Chiswick, London, W4 2PD

  P/2026/1750 Submitted 12 Jun 2026 20m away

  Non material amendment to allow the re-wording of condition 2 (approved plans) to update the approved plan list and to amendment the description of development to External alterations to the existing building including amendments to existing openings and associated works to elevations of planning permission P/2025/3155

  Granted Amendments 7 docs

• Thames Works, Church Street, Chiswick, London, W4 2PD

  PA/2026/1927 Submitted 29 Jun 2026 20m away

  Prior approval for the installation of 14 roof mounted solar photovoltaic (PV) panels to the existing pitched roof on the buildings Northwest elevation.

  Granted Outline 8 docs

• Thames Works, Church Street, Chiswick, London, W4 2PD

  P/2025/3166 Submitted 20 Oct 2025 20m away

  Alterations to existing doorways on the front elevation, one to be widened and a fan light added, and the other replaced with a glazed door.

  Granted Full applications Windows or glazing 13 docs

• Thames Works, Church Street, Chiswick, London, W4 2PD

  P/2025/0155 Submitted 17 Jan 2025 20m away

  Erection of a part second floor extension and conversion of the second floor from office use (Class E) to a House of Multiple Occupation for up to 5 people (Class C4)

  Withdrawn Full applications Extension 21 docs

• 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