Planning application
26/02380/FULL
15 - 19 Cavendish Place London W1G 0QE
Proposal
Erection of two storey mansard roof extension with associated dormer windows, plus extension on sixth floor to provide additional office (Class E) accommodation including plant space and green roof, infill of courtyards at ground and lower ground floors, extensions within southeast corner at first-fifth floor levels to provide terraces and an external staircase to rear of building, new glazing to existing windows, new shopfront with lowered cills for new active frontage at ground floor level.
As published by the council, reference 26/02380/FULL
Timeline
Dates from the published record
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10 Apr 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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26/01746/LBC Awaiting decision
Fourth Floor And Fifth Floor 7 Cavendish Square London W1G 0PE
Installation of single set of French doors to rear elevation. (Linked with 26/01745/FULL)
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26/01745/FULL Awaiting decision
Fourth Floor And Fifth Floor 7 Cavendish Square London W1G 0PE
Installation of single set of French doors to rear elevation. (Linked with 26/01746/LBC)
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26/03867/FULL Awaiting decision
Ground Floor 8 Cavendish Square London W1G 0PD
New entrance door and associated canopy to the existing ground floor unit.
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25/06077/LBC Granted
The Langham 1C Portland Place London W1B 1JA
Replacement and increase in height of the existing luggage store entrance door, including removal of the string course to match the adjacent opening. Internal works include partial wall removal and relocation of a freestanding staircase. (Linked with 25/06240/FULL)
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25/06240/FULL Granted
The Langham 1C Portland Place London W1B 1JA
Replacement and increase in height of the existing luggage store entrance door, including removal of the string course to match the adjacent opening. Internal works include partial wall removal and relocation of a freestanding staircase. (Linked with 25/06077/LBC)
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25/09310/FULL Refused
The Langham 1C Portland Place London W1B 1JA
Installation of a temporary pergola within the courtyard facing Cavendish Place from 1st April 2026 to 30th September 2026
Other full applications applications
In Westminster
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26/04824/ADFULL Granted
New Zealand House 80 Haymarket London SW1Y 4TE
Detailed design and specification of new blinds to NZH based on mock-up trials on-site. pursuant to condition 32 (i) of planning permission dated 8th April 2024 (23/00571/FULL).
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26/04829/ADFULL Granted
New Zealand House 80 Haymarket London SW1Y 4TE
Details of external and internal signage strategy pursuant to Condition 33(E) of planning permission dated 8th April 2024 (RN: 23/00571/FULL)
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26/04841/ADFULL Granted
29 Henstridge Place London NW8 6QD
Details of the facing materials you will use, including glazing, and elevations and roof plans annotated to show where the materials are to be located pursuant to condition 5 of planning permission dated 18th November 2025 (RN:25/06159).
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26/04989/FULL Awaiting decision
1 Kildare Terrace London W2 5JT
Erection of a mansard roof extending over the main house and side wing, replacement lower ground rear extension with roof terrace above, lowering of lower ground floor slab, installation of an air source heat pump in rear garden, new front boundary treatment, and new second floor window on the north elevation.
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26/04986/FULL Awaiting decision
Inver Court Inverness Terrace London W2 6JB
Replacement of combustible materials in the render facades; timber decking and plastic soffits/ fascias to terraces with non-combustible materials on the 5th and 6th floors.