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Planning application

Abercorn School 38 Portland Place London W1B 1LS

Awaiting decision Westminster 26/00351/FULL Full Planning Permission Application

Works: New dwelling

Relates to 26/00352/LBC

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

Proposal

Internal alterations to 38 Portland Place throughout to change the use from sui generis (Institutional Use) to Class E office use throughout in connection with removal of link building between 38 Portland Place and 9 Cavendish Mews North at ground, first and second floors, formation of a new rear stair core to main building and new external fire escape stair. New terraces to office space in connection with plant space and the installation of air source heat pumps. Alterations to the front and rear facades of the mews building in connection with internal alterations to create new residential units and new plant space to mews roof level and new terrace spaces all in connection with the change of use of ground to first floors from sui generis (institutional use) and second floor Class E (office use) of 9 Cavendish Mews North to Class C3 residential use to form 3x 1 bedroom flats. (Part of a land swap with 1 Marylebone High Street and Moxon House). (Linked to 26/00352/LBC)

As published by the council, reference 26/00351/FULL

Application record

Reference
26/00351/FULL
Type
Full Planning Permission Application
Status
Pending
Received
21 Jan 2026
Validated
21 Jan 2026
Ward
West End
Postcode
W1B 1LS

Site history

Applications at this address on the Westminster register

This site has had 4 applications since 2026.

  • 26/07321/ADFULL Awaiting decision

    Abercorn School 38 Portland Place London W1B 1LS

    Details of cycle storage pursuant to condition 13 of planning permission dated 9th July 2026 (RN: 26/00351/FULL).

    Submitted 26 Oct 2026
  • 26/06997/ADFULL Awaiting decision

    Abercorn School 38 Portland Place London W1B 1LS

    Details of how waste is to be stored on site and how materials for recycling will be stored separately pursuant to condition 14 of planning permission dated 9th July 2026 (RN: 26/00351/FULL)

    Submitted 13 Oct 2026
  • 26/00352/LBC Awaiting decision

    Abercorn School 38 Portland Place London W1B 1LS

    Internal alterations to 38 Portland Place throughout to change the use from sui generis (Institutional Use) to Class E office use throughout in connection with removal of link building between 38 Portland Place and 9 Cavendish Mews North at ground, first and second floors, formation of a new rear stair core to main building and new external fire escape stair. New terraces to office space in connection with plant space and the installation of air source heat pumps. Alterations to the front and rear facades of the mews building in connection with internal alterations to create new residential units and new plant space to mews roof level and new terrace spaces all in connection with the change of use of ground to first floors from sui generis (institutional use) and second floor Class E (office use) of 9 Cavendish Mews North to Class C3 residential use to form 3x 1 bedroom flats. (Part of a land swap with 1 Marylebone High Street and Moxon House). (Linked to 26/00351/FULL)

    Submitted 21 Jan 2026 Heritage and listed buildings

Timeline

Dates from the published record

  1. 21 Jan 2026

    Received by Westminster

  2. 21 Jul 2026

    Added to PlanIndex

  3. Decision

    Awaiting decision

    Decision expected by 18 March 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 91 days over the applications it decided in the last year.

Cases linked to this one on the register

  • 26/00352/LBC Awaiting decision

    Abercorn School 38 Portland Place London W1B 1LS

    Internal alterations to 38 Portland Place throughout to change the use from sui generis (Institutional Use) to Class E office use throughout in connection with removal of link building between 38 Portland Place and 9 Cavendish Mews North at ground, first and second floors, formation of a new rear stair core to main building and new external fire escape stair. New terraces to office space in connection with plant space and the installation of air source heat pumps. Alterations to the front and rear facades of the mews building in connection with internal alterations to create new residential units and new plant space to mews roof level and new terrace spaces all in connection with the change of use of ground to first floors from sui generis (institutional use) and second floor Class E (office use) of 9 Cavendish Mews North to Class C3 residential use to form 3x 1 bedroom flats. (Part of a land swap with 1 Marylebone High Street and Moxon House). (Linked to 26/00351/FULL)

    Submitted 21 Jan 2026 Heritage and listed buildings

3 later applications on the register refer to this one:

  • 26/07321/ADFULL Awaiting decision

    Abercorn School 38 Portland Place London W1B 1LS

    Details of cycle storage pursuant to condition 13 of planning permission dated 9th July 2026 (RN: 26/00351/FULL).

    Submitted 26 Oct 2026
  • 26/06997/ADFULL Awaiting decision

    Abercorn School 38 Portland Place London W1B 1LS

    Details of how waste is to be stored on site and how materials for recycling will be stored separately pursuant to condition 14 of planning permission dated 9th July 2026 (RN: 26/00351/FULL)

    Submitted 13 Oct 2026
  • 26/00352/LBC Awaiting decision

    Abercorn School 38 Portland Place London W1B 1LS

    Internal alterations to 38 Portland Place throughout to change the use from sui generis (Institutional Use) to Class E office use throughout in connection with removal of link building between 38 Portland Place and 9 Cavendish Mews North at ground, first and second floors, formation of a new rear stair core to main building and new external fire escape stair. New terraces to office space in connection with plant space and the installation of air source heat pumps. Alterations to the front and rear facades of the mews building in connection with internal alterations to create new residential units and new plant space to mews roof level and new terrace spaces all in connection with the change of use of ground to first floors from sui generis (institutional use) and second floor Class E (office use) of 9 Cavendish Mews North to Class C3 residential use to form 3x 1 bedroom flats. (Part of a land swap with 1 Marylebone High Street and Moxon House). (Linked to 26/00351/FULL)

    Submitted 21 Jan 2026 Heritage and listed buildings

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

37 applications on PlanIndex · 91% granted

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

85 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 119 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

  • Abercorn School 38 Portland Place London W1B 1LS

    26/00352/LBC Submitted 21 Jan 2026 50 yards away

    90% historically approved · decision due ~18 Mar

    Internal alterations to 38 Portland Place throughout to change the use from sui generis (Institutional Use) to Class E office use throughout in connection with removal of link building between 38 Portland Place and 9 Cavendish Mews North at ground, first and second floors, formation of a new rear stair core to main building and new external fire escape stair. New terraces to office space in connection with plant space and the installation of air source heat pumps. Alterations to the front and rear facades of the mews building in connection with internal alterations to create new residential units and new plant space to mews roof level and new terrace spaces all in connection with the change of use of ground to first floors from sui generis (institutional use) and second floor Class E (office use) of 9 Cavendish Mews North to Class C3 residential use to form 3x 1 bedroom flats. (Part of a land swap with 1 Marylebone High Street and Moxon House). (Linked to 26/00351/FULL)

    Awaiting decision Heritage and listed buildings New dwelling 61 docs

  • L'ecole Internationale Franco-Anglaise 36 Portland Place London W1B 1LS

    25/09231/FULL Submitted 19 Dec 2025 50 yards away

    Removal of reciprocal means of escape shared between 34 Portland Place and 36 Portland Place and implementation of fire upgrades throughout 36 Portland Place to ensure compliance with current building regulations affecting educational institutions within listed buildings. Works incorporate removal of redundant fire escape doors, upgrades to existing door furniture, installation of partitions to create fire separation lobbies, installation of mechanical extract among other minor alterations (Linked to 25/09232/LBC)

    Withdrawn Full applications 28 docs

  • Abercorn School 38 Portland Place London W1B 1LS

    26/07321/ADFULL Submitted 26 Oct 2026 50 yards away

    89% historically approved · decision due ~24 Dec

    Details of cycle storage pursuant to condition 13 of planning permission dated 9th July 2026 (RN: 26/00351/FULL).

    Awaiting decision

  • Abercorn School 38 Portland Place London W1B 1LS

    26/06997/ADFULL Submitted 13 Oct 2026 50 yards away

    89% historically approved · decision due ~8 Dec

    Details of how waste is to be stored on site and how materials for recycling will be stored separately pursuant to condition 14 of planning permission dated 9th July 2026 (RN: 26/00351/FULL)

    Awaiting decision

  • 36 Portland Place London W1B 1LS

    13/03998/ADFULL Submitted 2 May 2013 50 yards away

    Submission of details of refuse & recycling storage and a Travel Plan, pursuant to Conditions 9 and 10 of planning permission dated 08 March 2013 (RN: 12/07230)namely details .

    Granted Full applications 5 docs

  • L'ecole Internationale Franco-Anglaise 36 Portland Place London W1B 1LS

    25/09232/LBC Submitted 19 Dec 2025 50 yards away

    Removal of reciprocal means of escape shared between 34 Portland Place and 36 Portland Place and implementation of fire upgrades throughout 36 Portland Place to ensure compliance with current building regulations affecting educational institutions within listed buildings. Works incorporate removal of redundant fire escape doors, upgrades to existing door furniture, installation of partitions to create fire separation lobbies, installation of mechanical extract among other minor alterations (Linked to 25/09231/FULL)

    Withdrawn Heritage and listed buildings 29 docs

In Westminster

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    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
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    Received 3 Aug, published by the council 28 Aug 2026 Full applications
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    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