9 Mansfield Street London W1G 9NZ

This site has had 2 applications since 2025.

• 25/06412/FULL Awaiting decision

  9 Mansfield Street London W1G 9NZ

  Use as building as a single family dwellinghouse (Class C3). External alterations including the installation of replacement windows and doors. Installation of garage doors in place of to two windows on the Mansfield Mews frontage, installation of replacement roof lights, removal of roof lights at main roof level, removal of cantilevered outrigger WC at rear first floor level, alterations to fenestration of the mews portion of the building facing the internal courtyard to mews portion of building. Reconstruct part of brick parapet, installation of plant at main roof level . [SITE INCLUDES 6 MANSFIELD MEWS]

  Submitted 8 Sep 2025 Full applications

1. 8 Sep 2025

   Received by Westminster

2. 25 Sep 2025

   Validated

   Checked as complete and ready for consideration.

3. 21 Jul 2026

   Added to PlanIndex

4. Decision

   Awaiting decision

   Decision expected by 20 November 2025, 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 66 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 heritage and listed building applications in a median of 94 days. More in our guide to how long planning decisions take.

Listed building consent is needed for works that affect the special interest of a listed building, and carrying out such works without it is a criminal offence. More in our guide to planning application types.

• 9 Mansfield Street London W1G 9NZ

  25/06412/FULL Submitted 8 Sep 2025 50 yards away

  87% historically approved · decision due ~20 Nov

  Use as building as a single family dwellinghouse (Class C3). External alterations including the installation of replacement windows and doors. Installation of garage doors in place of to two windows on the Mansfield Mews frontage, installation of replacement roof lights, removal of roof lights at main roof level, removal of cantilevered outrigger WC at rear first floor level, alterations to fenestration of the mews portion of the building facing the internal courtyard to mews portion of building. Reconstruct part of brick parapet, installation of plant at main roof level . [SITE INCLUDES 6 MANSFIELD MEWS]

  Awaiting decision Full applications Extension Loft or dormer +2 156 docs
  Domestic

• 2 Mansfield Street London W1G 9NZ

  26/05715/LBC Submitted 20 Aug 2026 50 yards away

  90% historically approved · decision due ~15 Oct

  Installation of full fibre cables on and through the building.

  Awaiting decision Heritage and listed buildings

• 2 Mansfield Street London W1G 9NZ

  26/05036/LBC Submitted 27 Jul 2026 50 yards away

  90% historically approved · decision due ~21 Sep

  Installation of external air conditioning condenser unit at main roof level, associated external pipework and associated internal modifications (Flat 41).

  Decided Heritage and listed buildings 1 doc

• 2 Mansfield Street London W1G 9NZ

  26/05035/FULL Submitted 27 Jul 2026 50 yards away

  87% historically approved · decision due ~21 Sep

  Installation of an external air conditioning condenser unit at main roof level and associated external pipework (Flat 41).

  Decided Full applications 10 docs

• Orbis House 5 Mansfield Street London W1G 9NG

  25/08080/CLEUD Submitted 6 Nov 2025 50 yards away

  86% historically approved · decision due ~1 Jan

  Confirmation that the material change of use from office to use as a single family dwelling house under planning permission (RN 12/09926/FULL) has taken place and that use as a single family dwelling house is now the building's existing lawful use.

  Awaiting decision Lawful development 20 docs
  Domestic

• Orbis House 5 Mansfield Street London W1G 9NG

  26/04876/LBC Submitted 21 Jul 2026 50 yards away

  90% historically approved · decision due ~15 Sep

  Provision of guarding system to provide safe access for maintenance across the roof; alteration at south elevations omitting window SFW11 from the new WC, remove the existing RWP from the internal courtyard corner, removal of the existing plastic section of a redundant vent pipe at lower level and retain original lead; new cast iron rain water pipes at west elevation; and internal layout alterations at basement, ground, 2nd, 3rd floors. (Linked with 26/04873/NMA)

  Decided Heritage and listed buildings Windows or glazing

• 26/04878/LBC Decided

  34 Grosvenor Street London W1K 4QU

  Internal works to facilitate the subdivision of 34 Grosvenor Street and 3 Three Kings Yard

  Received 21 Jul, published by the council 1 Aug 2026 Heritage and listed buildings
• 26/06299/LBC Awaiting decision

  Apartment 33 24 Park Crescent London W1B 1AA

  Alterations to internal partitions, door openings, doors and floor finishes.

  Received 15 Sep, published by the council 22 Sep 2026 Heritage and listed buildings
• 26/06305/LBC Awaiting decision

  33A Dean Street London W1D 4PP

  Installation of new concrete slab with drainage channels at basement level and new fire surround in B.01.

  Received 15 Sep, published by the council 22 Sep 2026 Heritage and listed buildings
• 26/06318/LBC Awaiting decision

  124 Hamilton Terrace London NW8 9UT

  Replacement of existing first-floor sash windows to the front and rear elevations with traditionally detailed painted timber, slim-profile double-glazed sash windows. (Linked to 26/06317/FULL)

  Received 15 Sep, published by the council 22 Sep 2026 Heritage and listed buildings
• 26/04141/LBC Decided

  80E Randolph Avenue London W9 1BG

  Replacement of sashes in two front windows at 2nd floor level and one rear window with slimline double glazed timber sashes. (Linked with 26/04142/FULL)

  Received 23 Jun, published by the council 21 Jul 2026 Heritage and listed buildings