Planning application
25/09092/FULL
Penthouse Fourth Floor 84 Mount Street London W1K 2SP
Proposal
Installation of an air conditioning external condenser unit below the roof top stairs.
As published by the council, reference 25/09092/FULL
Timeline
Dates from the published record
-
16 Dec 2025
Received by Westminster
-
27 Jan 2026
Validated
Checked as complete and ready for consideration.
-
9 Apr 2026
Decision issued: Application Permitted
-
20 Jul 2026
Added to PlanIndex
What a grant of permission means
The process from here
Permission has been granted, usually subject to conditions listed on the decision notice, some of which must be discharged before work starts. The decision notice on the council portal sets out exactly what was approved.
Work must normally begin within three years of the decision or the permission lapses. Neighbours cannot appeal a grant; challenging one means judicial review of how the decision was made, within tight time limits.
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
-
26/04752/FULL Awaiting decision
Flat 1 61A South Audley Street London W1K 2QP
Removal of front French doors and rear elevation windows with timber casement door and double glazed timber sash windows.
-
26/04147/ADFULL Awaiting decision
61A South Audley Street London W1K 2QP
Details of facing materials / new roof lights, windows and doors / increased solidity of access to terraces pursuant to conditions 5, 6 and 9 of planning permission dated 16 September 2025 (RN: 24/06619/FULL)
-
25/05184/FULL Granted
61A South Audley Street London W1K 2QP
Roof alterations including infill extension, rear roof extension and creation of two roof terraces with metal railings all in connection with the enlagement and upgrade of the existing top floor residential flats (Flat 4 & 5) (Class C3). (Site include 62 South Audley Street)
-
25/07912/P3JPA Awaiting decision
6 Balfour Place London W1K 2AX
Notification for Prior Approval for the change of use of the lower ground floor and part of the ground floor from Use Class E to provide 1 residential flat Use Class C3 under the Town and Country Planning (General Permitted Development) (England) Order 2015 (as amended) Schedule 2, Part 3, Class MA.
-
22/05013/ADFULL Granted
87 - 88 Mount Street London W1K 2SR
Details pursuant to condition 3 of planning permission dated 16 June 2022 (RN: 21/07493/FULL); Namely detailed drawings of shopfronts, doors and windows.
-
22/04988/ADLBC Granted
87 - 88 Mount Street London W1K 2SR
Details pursuant to condition 3 of planning permission dated 16 June 2022 (RN: 21/07494/LBC); Namely detailed drawings of shopfronts, doors and windows.
Other full applications applications
In Westminster
-
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).
-
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)
-
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).
-
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.
-
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.