Flat 1 40 Montagu Square London W1H 2LL

1. 17 Dec 2025

   Received by Westminster

2. 16 Jan 2026

   Validated

   Checked as complete and ready for consideration.

3. 31 Mar 2026

   Decision issued: Application Permitted

4. 20 Jul 2026

   Added to PlanIndex

Westminster granted permission on 31 March 2026, subject to any conditions on the decision notice. Work must normally begin within three years or the permission lapses. More in our guide to what happens after a planning decision.

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.

• 16 Bryanston Mews East London W1H 2DB

  26/05412/FULL Submitted 10 Aug 2026 50 yards away

  88% historically approved · decision due ~5 Oct

  Installation of an air source heat pump and air conditioning condenser unit within acoustic enclosures on the flat roof area at rear first floor level.

  Decided Full applications

• 16 Bryanston Mews East London W1H 2DB

  26/05413/FULL Submitted 10 Aug 2026 50 yards away

  88% historically approved · decision due ~5 Oct

  Installation of an air source heat pump within an acoustic enclosure on the flat roof at rear first floor level.

  Decided Full applications

• 39 Montagu Square London W1H 2LL

  26/07416/LBC Submitted 30 Oct 2026 50 yards away

  90% historically approved · decision due ~25 Dec

  Amalgamation of Flats 3 and 4 to form one single dwelling including associated internal reconfiguration and refurbishments, alterations to access arrangements and improvements to the existing terrace and private amenity spaces. Together with the removal and alteration of modern partitions, roof replacement, rebuilding of the roof terrace, new plant and addition of a new staircase, structural works, new window openings, and other associated works. (Linked with 26/07415/FULL)

  Awaiting decision Heritage and listed buildings New dwelling Roofing +1
  Domestic

• 39 Montagu Square London W1H 2LL

  26/07415/FULL Submitted 30 Oct 2026 50 yards away

  88% historically approved · decision due ~25 Dec

  Amalgamation of Flats 3 and 4 (Use Class C3) to form one single dwelling (Use Class C3) including associated internal reconfiguration and refurbishments, alterations to access arrangements and improvements to the existing terrace and private amenity spaces, new plant and other associated works. (Linked with 26/07416/LBC)

  Awaiting decision Full applications New dwelling
  Domestic

• Basement And Ground Floor 38 Montagu Square London W1H 2LL

  26/00837/FULL Submitted 11 Feb 2026 50 yards away

  88% historically approved · decision due ~8 Apr

  Variation of condition 4(b) of planning permission dated 28 December 2023 (RN 23/07346/FULL) for the demolition of existing roof and erection of a mansard roof extension at first floor level and alterations to the front and rear of the portion of the building fronting onto Bryanston Mews East. Subdivision and reconfiguration of existing ground and lower ground floor levels of the building and together with the new first floor extension to the mews portion of the building, create two self-contained residential units (Class C3) and associated external alterations. Lowering of front pavement vault [Site includes 22 Bryanston Mews East] (Linked with 23/07347/LBC) NAMELY, to amend the wording of condition 4 (b) to remove reference of the approved rooflights are to be conservation rooflights and low profile horizontal rooflights.

  Awaiting decision Full applications Extension Loft or dormer +1 4 docs

• Basement And Ground Floor 38 Montagu Square London W1H 2LL

  25/09024/ADFULL Submitted 12 Dec 2025 50 yards away

  Details of the new rooflights, demonstrating that these are conservation rooflights pursuant to condition 4 (B) of listed building dated 28th December 2023 (RN: 23/07347/LBC)

  Refused Full applications Loft or dormer 5 docs

• 26/05473/LBC Decided

  9A Grosvenor Square London W1K 5AE

  Installation of natural Portland Stone paving to two front entrances. (Linked to 26/06273/FULL)

  Received 12 Aug, published by the council 22 Sep 2026 Heritage and listed buildings
• 26/07421/LBC Awaiting decision

  1 Upper St Martin's Lane London WC2H 9NY

  Installation of non-illuminated vinyl lettering to the external face of the existing ground-floor shopfront windows for a temporary period. (Linked with 26/07083/ADV)

  Received 30 Oct, published by the council 3 Nov 2026 Heritage and listed buildings
• 26/07416/LBC Awaiting decision

  39 Montagu Square London W1H 2LL

  Amalgamation of Flats 3 and 4 to form one single dwelling including associated internal reconfiguration and refurbishments, alterations to access arrangements and improvements to the existing terrace and private amenity spaces. Together with the removal and alteration of modern partitions, roof replacement, rebuilding of the roof terrace, new plant and addition of a new staircase, structural works, new window openings, and other associated works. (Linked with 26/07415/FULL)

  Received 30 Oct, published by the council 3 Nov 2026 Heritage and listed buildings
• 26/07404/LBC Awaiting decision

  Basement Floor And Ground Floor Queen Annes House 34 Queen Anne's Gate London SW1H 9AB

  Refurbishment and enhancement of the building to facilitate its continued use as offices with ancillary residential accommodation, together with associated conservation, restoration, accessibility improvements, building services upgrades, landscaping and ancillary works. Internal and external alterations associated with the repair. (Linked with 26/07403/FULL)

  Received 30 Oct, published by the council 3 Nov 2026 Heritage and listed buildings
• 26/07409/LBC Awaiting decision

  24 - 25 Mount Street London W1K 2RR

  Provision of internally illuminated temporary Christmas decoration to front facade at ground floor level between 18th December 2026 and 9th January 2027 (Linked to 26/07429/ADV)

  Received 30 Oct, published by the council 4 Nov 2026 Heritage and listed buildings