Third Floor Mappin House 4 Winsley Street London W1W 8HF

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

• 25/08684/LBC Granted

  Third Floor Mappin House 4 Winsley Street London W1W 8HF

  Removal and replacement of air conditioning units at roof level, and internal alterations to office space at third floor level. (Linked with 25/08683/FULL)

  Decided 2 Apr 2026 Heritage and listed buildings

1. 27 Nov 2025

   Received by Westminster

2. 7 Apr 2026

   Decision issued: Application Permitted

3. 20 Jul 2026

   Added to PlanIndex

• 25/08684/LBC Granted

  Third Floor Mappin House 4 Winsley Street London W1W 8HF

  Removal and replacement of air conditioning units at roof level, and internal alterations to office space at third floor level. (Linked with 25/08683/FULL)

  Decided 2 Apr 2026 Heritage and listed buildings

1 later application on the register refers to this one:

• 25/08684/LBC Granted

  Third Floor Mappin House 4 Winsley Street London W1W 8HF

  Removal and replacement of air conditioning units at roof level, and internal alterations to office space at third floor level. (Linked with 25/08683/FULL)

  Decided 2 Apr 2026 Heritage and listed buildings

Westminster granted permission on 7 April 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.

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.

• Third Floor Mappin House 4 Winsley Street London W1W 8HF

  25/08684/LBC Submitted 27 Nov 2025 50 yards away

  Removal and replacement of air conditioning units at roof level, and internal alterations to office space at third floor level. (Linked with 25/08683/FULL)

  Granted Heritage and listed buildings 27 docs

• 158 Oxford Street London W1D 1LZ

  26/01191/LBC Submitted 25 Feb 2026 50 yards away

  90% historically approved · decision due ~8 Jul

  Installation of 11 metres of fibre telecommunications cable from a fibre termination box in the basement telecoms room, to a communications cabinet located in the ground floor managers office.

  Awaiting decision Heritage and listed buildings 10 docs

• Ground Floor 156 Oxford Street London W1D 1ND

  26/02551/LBC Submitted 17 Apr 2026 50 yards away

  90% historically approved · decision due ~12 Jun

  Retrospective consent for the replacement of non-original pavement lights and associated structural repairs and below ground waterproofing remedial works.

  Awaiting decision Heritage and listed buildings 12 docs

• 156 Oxford Street London W1D 1ND

  25/08414/FULL Submitted 18 Nov 2025 50 yards away

  Installation of a new shopfront including internal fit out works and refurbishments at ground floor level; signage and other associated works. (Linked to 25/08415/LBC)

  Granted Full applications Windows or glazing 24 docs

• 156 Oxford Street London W1D 1ND

  25/08415/LBC Submitted 18 Nov 2025 50 yards away

  Installation of a new shopfront including internal fit out works and refurbishments at ground floor level; signage and other associated works. (Linked to 25/08414/FULL & 25/08091/ADV)

  Granted Heritage and listed buildings Windows or glazing 25 docs

• 156 Oxford Street London W1D 1ND

  25/08091/ADV Submitted 6 Nov 2025 50 yards away

  Display of one internally illuminated fascia sign (letters only) measuring 3.2m x 0.4m. (Linked iwth 25/08415/LBC)

  Granted Advertising 13 docs

• 26/07528/FULL Awaiting decision

  69 Eaton Place London SW1X 8DF

  Installation of new cast iron water pipe on rear courtyard elevation. (Linked with 26/07529/LBC)

  Received 5 Nov, published by the council 6 Nov 2026 Full applications
• 26/05200/FULL Decided

  1 The Court House 165 Seymour Place London W1H 4PU

  Installation of waterproofing system to the existing lead flat roofs

  Received 3 Aug, published by the council 28 Aug 2026 Full applications
• 26/07521/FULL Awaiting decision

  Flat 18 Harlequin Court 20 Tavistock Street London WC2E 7NZ

  Installation of one external condenser unit

  Received 4 Nov, published by the council 6 Nov 2026 Full applications
• 26/07508/FULL Awaiting decision

  Buckingham Palace The Mall London SW1A 1AA

  Replacement of existing security lighting to the Buckingham Palace Forecourt with 80 compact LED spotlights installed within the lantern clusters across 10 principal piers, with associated concealed cabling and reversible fixings. (Linked with 26/07509/LBC)

  Received 4 Nov, published by the council 5 Nov 2026 Full applications
• 26/07472/FULL Awaiting decision

  Flat 3 82 New Cavendish Street London W1G 9TA

  Replacement windows to second floor level with vacuum, double glazing windows. (Linked with 26/07473/LBC)

  Received 3 Nov, published by the council 6 Nov 2026 Full applications