26 St Marys Mansions St Mary's Terrace London W2 1SQ

This site has had 2 applications since 2025: 1 approved, 0 refused.

• 25/09249/FULL Granted

  26 St Marys Mansions St Mary's Terrace London W2 1SQ

  Replacement of all timber double-glazed windows at first floor level and installation of new air brick and flue to rear elevation.

  Decided 1 Apr 2026 Full applications

1. 18 Sep 2026

   Received by Westminster

2. 25 Sep 2026

   Added to PlanIndex

3. Decision

   Awaiting decision

   Decision expected by 13 November 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.

• 25/09249/FULL Granted

  26 St Marys Mansions St Mary's Terrace London W2 1SQ

  Replacement of all timber double-glazed windows at first floor level and installation of new air brick and flue to rear elevation.

  Decided 1 Apr 2026 Full applications

This application is with Westminster for determination, against a statutory target of eight weeks. Over the last year Westminster decided amendment applications in a median of 81 days. More in our guide to how long planning decisions take.

An amendment application makes limited changes to a permission that already exists; anything beyond modest adjustment needs a fresh application. More in our guide to planning application types.

• 26 St Marys Mansions St Mary's Terrace London W2 1SQ

  25/09249/FULL Submitted 22 Dec 2025 50 yards away

  Replacement of all timber double-glazed windows at first floor level and installation of new air brick and flue to rear elevation.

  Granted Full applications Windows or glazing 23 docs

• St Marys Mansions St Mary's Terrace London W2 1SQ

  25/06446/FULL Submitted 9 Sep 2025 50 yards away

  Retention of four roof space access hatch/doors to facilitate building maintenance

  Granted Full applications 18 docs

• 21 Hogan Mews London W2 1UP

  03/07919/TCA Submitted 6 Oct 2003 100 yards away

  4 x Cypress: (T1-T4), fell, 1 x Conifer: (T5), fell.

  Granted Trees 1 doc

• 8 Hogan Mews London W2 1UP

  04/08806/FULL Submitted 8 Nov 2004 100 yards away

  Construction of a single storey rear extension to existing single dwellinghouse.

  Granted Full applications Extension 11 docs
  Small domestic

• 4 Hogan Mews London W2 1UP

  07/09334/TCA Submitted 18 Oct 2007 100 yards away

  2 x Sycamores (Rear): Removal.

  Granted Trees 1 doc

• 18 Hogan Mews London W2 1UP

  24/00563/CLOPUD Submitted 30 Jan 2024 100 yards away

  Confirmation that the property has been rented since 2012 and the use is residential for a period of over 10 years.

  Withdrawn Lawful development 12 docs

• 26/07181/NMA Awaiting decision

  Newlands House 37 - 40 Berners Street London W1T 3NA

  Amendments to planning permission dated 9th October 2025 (RN:25/04048/FULL) forInfilling of the ground floor undercroft along Mortimer Street (Class E), replacement of ground floor frontage to the whole building and refurbishment of the upper floor facades. Namely, alterations to the approved green roof area at the site.

  Received 21 Oct, published by the council 22 Oct 2026 Amendments
• 26/07132/NMA Awaiting decision

  157 - 159 Victoria Street London SW1E 5NA

  Amendments to planning permission dated 27 August 2026 (RN: 26/04666/FULL) for the: Installation of combined defibrillator and bleed kit cabinets to external wall of Nationwide Building Society branch. NAMELY, to allow alteration to design of combined defibrillator and bleed kit cabinet.

  Received 19 Oct, published by the council 20 Oct 2026 Amendments
• 26/07086/NMA Awaiting decision

  Windsor House 50 Victoria Street London SW1H 0TL

  Amendments to planning permission dated 18th September 2026 (RN 26/01445/FULL) for the Refurbishment of Windsor House and Christchurch House (excluding residential part), including re-cladding and amendment of facades, replacement of windows, new end-of-trip facilities, installation of roof-level plant and screening, and associated works, to provide office, retail, restaurant and indoor recreation accommodation (Class E) with amenity spaces, including a new roof level pavilion to Christchurch House and link bridge between Windsor House and Christchurch House. NAMELY, amendments to the wording of Conditions 1, 11, 12, 13,14, 15 and 26.

  Received 16 Oct, published by the council 20 Oct 2026 Amendments
• 26/07071/NMA Awaiting decision

  London School Of Economics & Political Science Houghton Street London WC2A 2AE

  Amendments to planning permission dated 21st Februrary 2018 (RN:17/05855/FULL) for Variation of Condition 1 of planning permission dated 19 October 2016 (RN:16/05155/FULL) for demolition of existing buildings known as Clare Market, The Anchorage, the East Building, St Clements (partial) and Tower One (partial) and redevelopment to provide replacement interconnected academic facilities for Class D1 and ancillary uses, comprising a two storey basement, a part six storey / part 13 storey building and a seven storey core extension to the St Clements building and associated cycle parking and other works; all arranged around a new public square namely, removal of two cycle stands.

  Received 15 Oct, published by the council 16 Oct 2026 Amendments
• 26/06211/NMA Decided

  15 Portland Place London W1B 1PT

  Amendments to planning permission dated 21 July 2022 (RN:22/03521/FULL) which varied Condition 5 of planning permission dated 11 April 2018 (17/10815/FULL) for: Use of the building for a temporary period of 20 years as a medical use (Use Class D1) personal to OM Tower LLP namely to amend the wording of Condition 3 to omit the words " No one else may benefit from this permission" to allow the use by third party practitioners.

  Received 10 Sep, published by the council 16 Sep 2026 Amendments