18 St Marys Grove, Chiswick, London, W4 3LL

1. 30 Jul 2026

   Received by Hounslow

2. 31 Jul 2026

   Validated

   Checked as complete and ready for consideration.

3. 12 Aug 2026

   Added to PlanIndex

4. 2 Sep 2026

   Status changed to REGISTERED: Under Assessment

   Previously REGISTERED: Under Consultation.

5. Decision

   Awaiting decision

   Decision expected by 25 September 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 full application seeks permission for a complete, detailed proposal in one go: siting, design, access and landscaping are all fixed at this stage. It is the standard route for new buildings, conversions and changes of use. The statutory target is eight weeks for smaller schemes and thirteen weeks for major development, though complex cases often take longer by agreement.

More on full applications applications in our guide

• 18A ST MARYS GROVE, CHISWICK, LONDON, W4 3LL

  P/2021/2412 Submitted 14 Jun 2021 0m away

  Erection of an enlargement to existing basement.

  Granted Full applications 9 docs

• FLAT GROUND FLOOR 9 BURNABY GARDENS, CHISWICK, LONDON, W4 3DS

  P/2021/2431 Submitted 16 Jun 2021 42m away

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

  Granted Full applications Extension 9 docs
  Small domestic

• 13 Gordon Road, Chiswick, London, W4 3LU

  P/2024/1853 Submitted 5 Jun 2024 73m away

  Ground floor side infill extension and rear extension.

  Granted Householder Extension 14 docs
  Domestic

• 37 St Marys Grove, Chiswick, London, W4 3LN

  P/2025/2959 Submitted 2 Oct 2025 93m away

  Certificate of Lawfulness for change of use from a House in Multiple Occupation (Class 4) to a house (Class C3a).

  Granted Lawful development 13 docs

• 37 St Marys Grove, Chiswick, London, W4 3LN

  P/2025/3054 Submitted 10 Oct 2025 93m away

  Certificate of lawfulness for the proposed erection of two rear roof extensions with Juliet balconies, four front roof windows to the house and removal of chimney.

  Granted Lawful development Extension Windows or glazing 13 docs

• 7 WHITEHALL PARK ROAD, CHISWICK, LONDON, W4 3NE

  P/2023/0315 Submitted 31 Jan 2023 93m away

  Erection of a single storey rear and infill wrap around extension

  Granted Householder Extension 9 docs
  Small domestic

• P/2026/1189 Granted

  12 The Grove, Isleworth, TW7 4JZ

  Installation of one front boundary gate and new windows to allow the conversion of existing single family house to five self contained flats with associated refuse and cycle storage.

  17 Apr 2026 Full applications
• P/2026/1937 Granted

  Flat Ground Floor, 102 New Heston Road, Hounslow, TW5 0LF

  Erection of a single storey detached outbuilding for use as a home office in the rear garden of the flat

  30 Jun 2026 Full applications
• P/2026/1494 Granted

  2 Bath Road, Chiswick, London, W4 1LW

  Demolition of the single-storey rear extension, installation of temporary scaffolding to the façade of the building, installation of associated plant equipment, an external condenser unit and acoustic shelter. Internal layout alterations and installation of secondary glazing, external alterations including re-rendering to allow continued use under Class E (c) and (g)(i)

  6 May 2026 Full applications
• P/2026/1936 Refused

  Flat First Floor, 102 New Heston Road, Hounslow, TW5 0LF

  Erection of a rear roof and outrigger extension with two front rooflights to the flat

  30 Jun 2026 Full applications
• P/2026/0592 Granted

  87 Cranleigh Road, Feltham, TW13 4QA

  Erection of a two storey residential house with associated landscaping, private amenity space, cycle and refuse storage.

  19 Feb 2026 Full applications