Planning application
26/00351/FULL
Abercorn School 38 Portland Place London W1B 1LS
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
Timeline
Dates from the published record
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21 Jan 2026
Received by Westminster
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21 Jul 2026
Added to PlanIndex
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Decision
Awaiting decision
The statutory target is eight weeks for most applications and thirteen for major development. Extensions of time are common.
What happens while it is decided
The process from here
This application is with Westminster for determination. The council publicises it, consults neighbours and technical bodies where required, and weighs the responses against local and national planning policy.
The statutory target is eight weeks for most applications and thirteen for major development, though extensions of time are common. Comments carry most weight while the case is undecided, so check the council portal for the deadline if you want to respond.
About full applications applications
How this application type works
A full application seeks permission for a complete, detailed proposal in one go: siting, design, access and landscaping are all fixed at this stage. It is the standard route for new buildings, conversions and changes of use. The statutory target is eight weeks for smaller schemes and thirteen weeks for major development, though complex cases often take longer by agreement.
Nearby applications
Within 500 metres
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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)
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25/09231/FULL Withdrawn
L'ecole Internationale Franco-Anglaise 36 Portland Place London W1B 1LS
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)
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13/03998/ADFULL Granted
36 Portland Place London W1B 1LS
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 .
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25/09232/LBC Withdrawn
L'ecole Internationale Franco-Anglaise 36 Portland Place London W1B 1LS
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)
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25/09187/LBC Awaiting decision
34 Portland Place London W1B 1LX
Use of 34 Portland Place primarily as the Ambassador's dwellinghouse, use of 73 New Cavendish Street as a Polish cultural centre and diplomatic premises, and associated alterations and extensions. [Linked to 25/09186/FULL]
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25/09186/FULL Awaiting decision
34 Portland Place London W1B 1LX
Use of 34 Portland Place primarily as the Ambassador's dwellinghouse, use of 73 New Cavendish Street as a Polish cultural centre and diplomatic premises, and associated alterations and extensions. [Linked to 25/09187/LBC]
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