26 Montagu Mews South London W1H 7ES

1. 25 Jul 2025

   Received by Westminster

2. 1 Sep 2025

   Validated

   Checked as complete and ready for consideration.

3. 17 Oct 2025

   Decision issued: Application Permitted

4. 21 Jul 2026

   Added to PlanIndex

Westminster granted permission on 17 October 2025, 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.

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.

• 11 Montagu Mews South London W1H 7ER

  26/03408/FULL Submitted 22 May 2026 50 yards away

  87% historically approved · decision due ~17 Jul

  Installation of replacement existing windows with double glazed units to improve the thermal performance of the property.

  Awaiting decision Full applications Windows or glazing 8 docs

• 22 Montagu Mews South London W1H 7ES

  04/09799/CAC Submitted 10 Dec 2004 50 yards away

  Demolition of roof, part rear elevation, internal partitions and floors.

  Granted Heritage and listed buildings Demolition 2 docs

• 22 Montagu Mews South London W1H 7ES

  04/09798/FULL Submitted 10 Dec 2004 50 yards away

  Demolition of roof and replacement with extended roof and infill of rear lightwell.

  Granted Full applications Extension Demolition 9 docs

• 21 Montagu Street London W1H 7EX

  25/08812/FULL Submitted 4 Dec 2025 50 yards away

  Installation of new external vent and timber louvred door in lightwell (21-22 Montagu Street).

  Granted Full applications 15 docs

• 15 - 16 Montagu Mews South London W1H 7ET

  26/03608/ADFULL Submitted 2 Jun 2026 50 yards away

  87% historically approved · decision due ~28 Jul

  Details of all new windows, omission of the rooflight to the front roof slope conservation rooflight and main door pursuant to conditions 4, 5 and 6 of planning permission dated 7th May 2026 (RN:26/00330).

  Awaiting decision Full applications Loft or dormer Windows or glazing 8 docs

• 3 Brunswick Mews London W1H 7FB

  25/07709/ADFULL Submitted 24 Oct 2025 50 yards away

  Details of appropriate arrangements to secure measures to mitigate the potential increased demand for on-street residents car parking in the vicinity of the site pursuant to condition 3 of planning permission dated 5th February 2025 (RN:24/08126/FULL)

  Withdrawn Full applications 19 docs

• 26/06295/FULL Awaiting decision

  15 Warwick Way London SW1V 1QT

  Installation of a new shopfront with Medication Dispensing Outlet.

  Received 15 Sep, published by the council 17 Sep 2026 Full applications
• 26/06297/FULL Awaiting decision

  15 Warwick Way London SW1V 1QT

  Alterations to rear elevation at basement level comprising replacement window and installation of double opening door.

  Received 15 Sep, published by the council 17 Sep 2026 Full applications
• 26/06294/FULL Awaiting decision

  15 Eaton Mews South London SW1W 9HP

  Installation of railings and sliding lantern light at main roof level in connection with the use of the roof as a terrace.

  Received 15 Sep, published by the council 22 Sep 2026 Full applications
• 26/06317/FULL 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 26/06318/LBC)

  Received 15 Sep, published by the council 22 Sep 2026 Full applications
• 26/06273/FULL Awaiting decision

  9A Grosvenor Square London W1K 5AE

  Installation of natural Portland Stone paving to two front entrances. (Linked to 26/05473/LBC)

  Received 14 Sep, published by the council 22 Sep 2026 Full applications