55 - 57 Marylebone High Street London W1U 5HS

1. 14 Oct 2026

   Received by Westminster

2. 15 Oct 2026

   Added to PlanIndex

3. Decision

   Awaiting decision

   Decision expected by 9 December 2026, 8 weeks from validation under the statutory target for most applications. Extensions of time are common and are agreed case by case.

   Westminster took a median of 86 days over the applications it decided in the last year.

This application is with Westminster for determination, against a statutory target of eight weeks. Over the last year Westminster decided full applications in a median of 119 days. More in our guide to how long planning decisions take.

A full application seeks permission for a complete, detailed proposal in one go, with siting, design, access and landscaping all fixed at this stage. More in our guide to planning application types.

• 30 Devonshire Place Mews London W1G 6DB

  04/01876/FULL Submitted 10 Mar 2004 50 yards away

  Alterations, including erection of a roof extension, in connection with the enlargement of single dwellinghouse.

  Granted Full applications Extension 10 docs
  Domestic

• 32 Devonshire Place Mews London W1G 6DB

  03/08280/FULL Submitted 24 Oct 2003 50 yards away

  Alterations and extension including the erection of a mansard roof and use as a 1 x 3 bedroom single family dwellinghouse in conjunction with the rear ground floor of 32 Devonshire Place.

  Withdrawn Full applications Extension Loft or dormer 10 docs
  Domestic

• 32 Devonshire Place Mews London W1G 6DB

  03/08281/CAC Submitted 24 Oct 2003 50 yards away

  Alterations and extension including the erection of a mansard roof and use as a 1 x 3 bedroom single family dwellinghouse in conjunction with the rear ground floor of 32 Devonshire Place.

  Withdrawn Heritage and listed buildings Extension Loft or dormer 3 docs
  Domestic

• 32 Devonshire Place Mews London W1G 6DB

  06/00876/ADFULL Submitted 6 Feb 2006 50 yards away

  Details of facing materials, including glazing pursuant to Condition 2 of planning permission dated 16 August 2005 (RN: 05/04671).

  Granted Full applications Windows or glazing 4 docs

• 32 Devonshire Place Mews London W1G 6DB

  05/10153/ADFULL Submitted 16 Dec 2005 50 yards away

  Detail of facing materials and glazing pursuant to Condition 2 of planning permission dated 16 August 2005 (RN: 05/04671) (brickwork only).

  Refused Full applications Windows or glazing 3 docs

• 32 Devonshire Place Mews London W1G 6DB

  05/09355/ADFULL Submitted 16 Nov 2005 50 yards away

  Detail of facing materials and glazing pursuant to Condition 2 of planning permission dated 16 August 2005 (RN: 05/04671) (glazing only).

  Refused Full applications Windows or glazing 7 docs

• 26/05984/FULL Decided

  41 Sutherland Street London SW1V 4JX

  Replacement of front, side and rear windows with double glazed timber framed sash windows and replacement of a door with a double glazed timber framed door.

  Received 2 Sep, published by the council 11 Sep 2026 Full applications
• 26/06134/FULL Decided

  Flat 10H Hyde Park Mansions Cabbell Street London NW1 5BG

  Replacement of front and rear second floor level windows with slim-profile double-glazed panels, retaining the existing window and door frames.

  Received 8 Sep, published by the council 15 Sep 2026 Full applications
• 26/07258/FULL Awaiting decision

  16A Croxley Road London W9 3HL

  Installation of air to air heat pumps to offices and bedrooms.

  Received 22 Oct, published by the council 23 Oct 2026 Full applications
• 26/07193/FULL Awaiting decision

  98 Victoria Street London SW1E 5JL

  Shopfront alterations. (Linked with 26/07194/ADV)

  Received 21 Oct, published by the council 22 Oct 2026 Full applications
• 26/07187/FULL Awaiting decision

  Ground Floor Flat 151 Portnall Road London W9 3BN

  Erection of a single storey rear extension.

  Received 21 Oct, published by the council 22 Oct 2026 Full applications