Planning application
26/03247/FULL
Basement And Ground Floor Masionette 3 Upper Brook Street London W1K 6PA
Proposal
Replacement of existing front elevation sash windows with slimline double-glazed heritage units; replacement of windows and doors in rear modern extension and internal lightwell along with formation of a new window opening. (Linked with 26/03248/LBC)
As published by the council, reference 26/03247/FULL
Timeline
Dates from the published record
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18 May 2026
Received by Westminster
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28 May 2026
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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25/09294/LBC Granted
Basement And Ground Floor Masionette 3 Upper Brook Street London W1K 6PA
Replacement and reconfiguration of modern partitions at ground and lower ground floor level, along with the replacement of modern bathroom and kitchen fittings and finishes.
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26/03248/LBC Awaiting decision
Basement And Ground Floor Masionette 3 Upper Brook Street London W1K 6PA
Replacement of existing front elevaiton sash windows with slimline double-glazed heritage units together with minor repair and redecoration of existing facade and existing front doors; replacement of windows and doors in rear modern extension and internal lightwell along with formation of a new window opening. (Linked with 26/03247/FULL)
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26/02508/FULL Awaiting decision
Development Site At 1 Lees Place, 43 North Audley Street And 22 Grosvenor Square London W1K 6DT
Installation of a single-storey retail pod to the front of the building, fronting North Audley Street, for a temporary period from 1 September 2026 to 31 March 2027. (Linked with 26/02509/LBC)
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26/02509/LBC Awaiting decision
Development Site At 1 Lees Place, 43 North Audley Street And 22 Grosvenor Square London W1K 6DT
Installation of a single-storey retail pod to the front of the building, fronting North Audley Street, for a temporary period from 1 September 2026 to 31 March 2027. (Linked with 26/02508/FULL)
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25/09270/FULL Granted
30 Grosvenor Square London W1K 6AN
Installation of permanent external planter boxes at ground floor level on the Upper Brook Street elevation and associated works.
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22/04380/NMA Granted
2 Shepherd Close London W1K 6EA
Amendments to planning permission dated 23 June 2022 (RN:22/02527/FULL) for Enlargement of existing front lightwell, addition of rooflight over main staircase, relocation of lower ground floor door on the rear elevation, addition of lead capped entrance canopy at lower ground level, replacement lead roofing on rear outbuilding, alterations to fenestration openings at lower ground level, replacement fenestrations, and other associated works. NAMELY; revisions to window openings at front lower ground floor level and addition of air bricks.
Other full applications applications
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26/04824/ADFULL Granted
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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
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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.