Planning application
26/04924/FULL
1 Sussex Street London SW1V 4RZ
Proposal
Erection of mansard extension and new side window at second floor level.
As published by the council, reference 26/04924/FULL
Timeline
Dates from the published record
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23 Jul 2026
Received by Westminster
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1 Aug 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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26/02494/FULL Awaiting decision
1 Sussex Street London SW1V 4RZ
Erection of a single-storey side infill extension over the existing side balcony at ground floor level and roof light to flat roof in front lightwell.
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26/04925/FULL Awaiting decision
1 Sussex Street London SW1V 4RZ
Erection of a side infill at raised ground floor level and terrace over at first floor level, with replacement window to single door.
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26/01903/TCA Granted
Basement Flat A 103 Alderney Street London SW1V 4HE
1 x bay tree (rear): reduce height by 2m to 3m; to no more than previous reduction points; retaining shortened growth for furnishing. Reduce sides to match (by approximately 1m to 1.5m). Thin crown by 20%. 1 x Cotoneaster (rear): reduce low lateral branch over neighbours garden back to the upwards growing lateral branch about 1m from the main trunk union, reduce remaining crown by 2-3m all round to shape and balance ensuring retention of fine branch structure across the entire canopy area for crown continuity.
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25/06023/TCA Granted
110 Cambridge Street London SW1V 4QF
1 x whitebeam: remove four small branches as identified in the submitted photo.
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26/02491/FULL Awaiting decision
2 Sussex Street London SW1V 4RU
Infill extension to front/side lightwell at lower ground floor level, excavation beneath four existing vaults, creation of new windows and door and installation of new stairs to front basement lightwell
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25/05397/FULL Granted
106G Cambridge Street London SW1V 4QG
Installation of replacement double glazed windows at fourth floor level.
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.