Planning application
25/05651/FULL
20 Carlton House Terrace London SW1Y 5AN
Proposal
Installation of pergola structure at L8 terrace, new bi-fold doors at L8 terrace and new louvres at ground floor level fronting Cockspur Court and Warwick House Street. (Retrospective)
As published by the council, reference 25/05651/FULL
Timeline
Dates from the published record
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12 Aug 2025
Received by Westminster
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18 Sep 2025
Validated
Checked as complete and ready for consideration.
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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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25/06152/ADFULL Granted
20 Carlton House Terrace London SW1Y 5AN
Details of manufacturer's specification of light fittings (labelled FL1-DZ4, F1-D27 on the Carlton House Terrace elevation, F3-DZ14 on the Warwick House Street elevation and F2-DZ10 and F2-DZ9 on the Cockspur Court Facade) pursuant to condition 5 of planning permission dated 04 November 2024 (RN: 24/01754/FULL).
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25/05797/ADFULL Granted
20 Carlton House Terrace London SW1Y 5AN
Detailed design of the of entrance doors to the basement car park area including the vehicular entrance and exit to the basement car park area; and new staircase to Cockspur Court pursuant to Condition 9 (iv and vi) (partial) of planning permission dated 28 July 2023 (RN 23/02725/FULL).
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26/01960/RESMAT Awaiting decision
14 - 16 Cockspur Street London SW1Y 5BL
Details of how waste is to be stored on site and how materials for recycling will be stored separately. You must not operate the consular service hereby approved as part of the continued embassy use (sui generis) until we have approved what you have sent us. You must then provide the waste and recycling storage prior to occupation of the development and thereafter permanently retain the stores according to these details. You must clearly mark them and make them available at all times to everyone using the embassy (sui generis). You must not use the waste and recycling store for any other purpose.
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26/04366/ADLBC Awaiting decision
14 - 16 Cockspur Street London SW1Y 5BL
Details of the new panelling profiles scaled 1:10 pursuant to condition 6 of listed building dated 16th April 2026 (RN:25/09094/LBC)
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26/02156/ADV Awaiting decision
20 Cockspur Street London SW1Y 5BL
Display of 1one non illuminated façade replication wrap measuring 8m x 6m for a temporary period of 9 months.
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25/06350/ADFULL Awaiting decision
14 - 16 Cockspur Street London SW1Y 5BL
Detailed drawings of the new rooftop stair enclosure; and new door on the Cockspur Street elevation and secure cycle storage pursuant to Condition 4 (a and b) and Condition 9 of planning permission dated 04 June 2025 (25/00355/FULL).
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.