Planning application
26/03485/FULL
25 Hill Street London W1J 5LW
Proposal
Replacement linked two-storey annex with roof terrace, rebuilding of rear mansard roof and creation of roof terrace. Reconfiguration and landscaping of garden to rear of 27 Hill Street and erection of pavilion building with new access point from Chesterfield Hill; replacement plant equipment on roof all in association with the continued office (Class E) use. (Linked with 26/03486/LBC)
As published by the council, reference 26/03485/FULL
Timeline
Dates from the published record
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28 May 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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26/03486/LBC Awaiting decision
25 Hill Street London W1J 5LW
External repairs to front and rear facades, replacement linked two-storey annex with roof terrace, rebuilding of rear mansard roof and creation of new internal mezzanine with spiral staircase access and roof terrace. Reconfiguration and landscaping of garden to rear of 27 Hill Street and erection of pavilion building with new access point from Chesterfield Hill, replacement roof plant equipment and internal alterations. (Linked with 26/03485/FULL)
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04/09915/ADFULL Granted
21 - 23 Hill Street London W1J 5LW
Details of porch, portico, entrance doors and fanlights pursuant to Condition 6 (2,3 +4) of planning permission dated 10 July 2002 (RN: 01/06157).
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05/08895/FULL Decided
21 - 23 Hill Street London W1J 5LW
Installation of two satellite dishes on the roof.
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13/01908/AD7 Granted
25 Hill Street London W1J 5LW
Display for a temporary period of six months of a non-illuminated estate agent board attached to the railings in front of the building at street level and measuring 0.6m x 0.45m.
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05/03875/CAC Decided
21 - 23 Hill Street London W1J 5LW
Installation of lower ground floor level gantry for the purposes of housing the plant.
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05/03874/FULL Granted
21 - 23 Hill Street London W1J 5LW
Installation of two air conditioning chillers and one air handling unit on lower ground floor gantry within acoustic louvres at rear of property.
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.