Planning application
26/01800/FULL
90 Park Street London W1K 6NP
Proposal
Erection of single storey rear extension at third floor level with roof terrace above enclosed by glass balustrade, to enlarge dwellinghouse (Class C3).
As published by the council, reference 26/01800/FULL
Timeline
Dates from the published record
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19 Mar 2026
Received by Westminster
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13 Apr 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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26/02820/FULL Awaiting decision
96 Park Street London W1K 6NY
Variation of Condition 1 of planning permission dated 25th February 2025 (RN:24/09049/FULL) for: External alterations including the erection of single-storey roof extension to enlarge the existing, albeit reconfigured, fourth floor flats with a terrace, plant within an enclosure, an area sedum roof and an area blue roof above; installation of replacement windows throughout, installation of a replacement garage door and the installation of new dry riser inlet inset within existing railing to the lightwell along the Park Street frontage (Site include 92 - 96 Park Street) namely, reconfiguring the blue/green roof and paving slab finishes, raising of a portion of the party wall to 98-100 Park Street to provide guarding to the proposed roof terrace; reduction in number of fixed roof lights and increased sizes of two remaining fixed roof lights, the opening glazed roof light providing access from the Flat 10 5th floor to the roof terrace raised by 430mm, portion of main roof lowered over the existing lift shaft to receive one of the proposed ASHP, in order to screen the ASHP and ensure adequate air flow around the unit, the location of the second ASHP is proposed on the terrace, again to ensure adequate air flow to the unit, a new metal access ladder, painted black, is proposed to provide roof access from the 4th floor flat roof adjacent to the lightwell to the main roof in order to maintain the blue/green roof and services plant, three smaller opaque glazed windows are proposed overlooking the lightwell at 5th floor level & a pair of solid timber fire doors, new handrails are proposed to the flat roof surrounding the 4th floor roof adjacent to the lightwell, At 4th floor level, three of four existing windows overlooking the lightwell to recieve treatment
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26/02290/ADFULL Awaiting decision
96 Park Street London W1K 6NY
Details of photographs of samples of glazing, elevations and roof plans; detailed drawings and a bio-diversity management plan in relation to the green roof; details of the blue roof and details of the waste water heat recovery pursuant to discharge of conditions 4,9,10 and 11 of planning permission dated 25th February 2025 (RN: 24/09049/FULL).
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26/01878/AD7 Awaiting decision
104 Park Street London W1K 6NF
Display for a temporary period of six months of a non-illuminated 'to let' board attached to the railings in front of the building at street level and measuring 0.6 x 0.9m. (renewal)
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26/03601/AD7 Awaiting decision
104 Park Street London W1K 6NF
Display for a temporary period of six months of a non-illuminated estate agent board located on the face of the building at ground floor level and measuring 0.45m x 0.6m.
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26/04177/CLEUD Awaiting decision
21 Lees Place London W1K 6LR
Lawful implementation of previously approved development under planning ref 24/08789/FULL granted 10th February 2025 for "Amalgamation of two existing two-bedroom flats located on first and second floors of the property into a single family sized four-bedroom residential unit. Addition of a rooflight to the flat section of the roof."
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02/06749/LBC Granted
22 Upper Brook Street London W1K 7PT
Creation of doorway between reception lobby and front room at ground 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.