6 Masionette First And Second Floors,Marshall Close,Hounslow,TW4 5HJ

1. 29 Jul 2026

   Received by Hounslow

2. 20 Aug 2026

   Validated

   Checked as complete and ready for consideration.

3. 26 Aug 2026

   Added to PlanIndex

4. Decision

   Awaiting decision

   Decision expected by 15 October 2026, 8 weeks from validation under the statutory target for most applications. Extensions of time are common and are agreed case by case.

   Hounslow took a median of 55 days over the applications it decided in the last year.

This application is with Hounslow for determination. The council publicises it, consults neighbours and technical bodies where required, and weighs the responses against local and national planning policy.

The statutory target is eight weeks for most applications and thirteen for major development, though extensions of time are common. Comments carry most weight while the case is undecided, so check the council portal for the deadline if you want to respond.

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

• 311 Wellington Road South, Hounslow, TW4 5HL

  P/2025/2597 Submitted 26 Aug 2025 78m away

  Formation of a dropped kerb at front of property

  Refused Householder 5 docs
  Small domestic

• 5 ROSEHEATH ROAD, HOUNSLOW, TW4 5HH

  P/2021/2140 Submitted 1 Jun 2021 123m away

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

  Granted Lawful development Extension Loft or dormer +1 5 docs

• 196 Wellington Road South, Hounslow, TW4 5JL

  P/2026/1952 Submitted 1 Jul 2026 125m away

  Certificate of lawfulness for the proposed replacement of like for like windows and external doors, external wall insulation with a rendered finish to match the existing rendered finish, new main roof mounted photovoltaic solar panel array and battery storage to the House in Multiple Occupation.

  Granted Lawful development Windows or glazing 8 docs

• FLAT C 262 WELLINGTON ROAD SOUTH, HOUNSLOW, TW4 5JP

  P/2021/2041 Submitted 24 May 2021 150m away

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

  Granted Full applications Extension 5 docs
  Small domestic

• FLAT G 262 WELLINGTON ROAD SOUTH, HOUNSLOW, TW4 5JP

  P/2021/1571 Submitted 22 Apr 2021 150m away

  Erection of a rear roof extension with three front roof windows.

  Granted Full applications Extension Windows or glazing 5 docs

• 27 BERESFORD GARDENS, HOUNSLOW, TW4 5HN

  P/2021/2751 Submitted 6 Jul 2021 153m away

  Erection of a two storey side extension to the house

  Refused Householder Extension 8 docs
  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