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Planning application

1 Marylebone High Street London W1U 4DL

Awaiting decision Westminster 25/08905/FULL Full Planning Permission Application

Still open. Anyone can comment while the consultation period runs, and comments go to the council rather than to us.

Proposal

Use of the 1st and 2nd floor maisonette from residential use (Class C3) to office use (Class E). This application forms part of a land use swap with 38 Portland Place (inc. 9 Cavendish Mews North) and Moxon House

As published by the council, reference 25/08905/FULL

Application record

Reference
25/08905/FULL
Type
Full Planning Permission Application
Status
Pending
Received
8 Dec 2025
Validated
8 Dec 2025
Ward
Marylebone
Postcode
W1U 4DL

Site history

Applications at this address on the Westminster register

This site has had 5 applications since 2025: 2 approved, 0 refused.

  • 26/05334/FULL Awaiting decision

    1 Marylebone High Street London W1U 4DL

    Removal of existing Luxcrete panelled pavement and replacement with York stone paving slabs outside 1 Marylebone High Street; and addition of textured porcelain tiles to office entrance step.

    Submitted 6 Aug 2026 Full applications
  • 26/00431/NMA Awaiting decision

    1 Marylebone High Street London W1U 4DL

    Amendments to planning permission dated 18 June 2025 (RN: 24/08179/FULL) for the: Rear extension to existing building, formation of new roof terrace including rooftop pavilion, new external plant, replacement of existing windows with double glazing and minor alterations to building facade including new entrance. Namely, to allow the removal of existing entrance step with a ramp; removal of existing smoke vents and pavement lights with concrete to match existing; and changes in window arrangement on rear and north elevation of the building.

    Submitted 26 Jan 2026 Amendments
  • 25/06757/ADFULL Granted

    1 Marylebone High Street London W1U 4DL

    Detailed samples of the cladding for the rooftop pavilion pursuant to condition 4 of planning permission dated 18th June 2025 (RN: 24/08179).

    Decided 7 Oct 2025 Full applications
  • 25/05396/ADFULL Granted

    1 Marylebone High Street London W1U 4DL

    Details of shopfront, new windows, new glazed entrance door, refuse & recycling storage, all flood resilient and resistant measures, elevation and floor plans showing privacy measures to prevent occupants of the terrace overlooking the roof terrace, pre-demolition audit and secure cycle storage for the ground floor retail units (two spaces) pursuant to conditions 8, 11, 15, 17, 20 and 21 of planning permission dated 18th June 2025 (RN:24/08179).

    Decided 6 Oct 2025 Full applications

Timeline

Dates from the published record

  1. 8 Dec 2025

    Received by Westminster

  2. 20 Jul 2026

    Added to PlanIndex

  3. Decision

    Awaiting decision

    Decision expected by 2 February 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 66 days over the applications it decided in the last year.

Who's behind it

Company information only, from the register and Companies House

Howard de Walden Estates Limited Agent, a developer registered in London

Active · incorporated 1963 · London

35 applications on PlanIndex

Trade members see everything this firm has filed, how it was decided, and get an email the day it files again.

See their track record

Documents

Plans, drawings, consultee responses and the officer's report

14 documents on file for this application

A planning file usually holds the application form, drawings and site plans, consultee responses, the officer's report and the decision notice.

Watch members (£5 a month) open the document list from here.

Open the documents

What happens while it is decided

This application is with Westminster for determination, against a statutory target of eight weeks. Over the last year Westminster decided full applications in a median of 91 days. More in our guide to how long planning decisions take.

About full applications

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.

Nearby applications

Within 0.3 miles

  • 1 Marylebone High Street London W1U 4DL

    25/06757/ADFULL Submitted 19 Sep 2025 50 yards away

    Detailed samples of the cladding for the rooftop pavilion pursuant to condition 4 of planning permission dated 18th June 2025 (RN: 24/08179).

    Granted Full applications 8 docs

  • 1 Marylebone High Street London W1U 4DL

    25/05396/ADFULL Submitted 1 Aug 2025 50 yards away

    Details of shopfront, new windows, new glazed entrance door, refuse & recycling storage, all flood resilient and resistant measures, elevation and floor plans showing privacy measures to prevent occupants of the terrace overlooking the roof terrace, pre-demolition audit and secure cycle storage for the ground floor retail units (two spaces) pursuant to conditions 8, 11, 15, 17, 20 and 21 of planning permission dated 18th June 2025 (RN:24/08179).

    Granted Full applications Demolition Windows or glazing 24 docs

  • 1 Marylebone High Street London W1U 4DL

    26/00431/NMA Submitted 26 Jan 2026 50 yards away

    93% historically approved · decision due ~25 May

    Amendments to planning permission dated 18 June 2025 (RN: 24/08179/FULL) for the: Rear extension to existing building, formation of new roof terrace including rooftop pavilion, new external plant, replacement of existing windows with double glazing and minor alterations to building facade including new entrance. Namely, to allow the removal of existing entrance step with a ramp; removal of existing smoke vents and pavement lights with concrete to match existing; and changes in window arrangement on rear and north elevation of the building.

    Awaiting decision Amendments Extension Roofing +1 18 docs

  • 1 Marylebone High Street London W1U 4DL

    26/05334/FULL Submitted 6 Aug 2026 50 yards away

    87% historically approved · decision due ~1 Oct

    Removal of existing Luxcrete panelled pavement and replacement with York stone paving slabs outside 1 Marylebone High Street; and addition of textured porcelain tiles to office entrance step.

    Awaiting decision Full applications

  • 3 Marylebone High Street London W1U 4NG

    26/00410/ADV Submitted 23 Jan 2026 50 yards away

    Display of an internally illuminated (letters only) fascia sign measuring 2.61m x 0.235m.

    Granted Advertising 10 docs

  • 120 Marylebone Lane London W1U 2QG

    05/06121/ADFULL Submitted 29 Jul 2005 50 yards away

    Details of bevelled glass pursuant to Condition 2 of planning permission dated 30 June 2005 (RN: 05/03306).

    Granted Full applications 2 docs

In Westminster

  • 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