Planning application
26/01148/FULL
Basement And Ground Floor Northumberland House 155 - 157 Great Portland Street London W1W 6QP
Proposal
Dual alternative use of the ground and basement floors as showroom (sui generis) or MRI medical centre (Class E)
As published by the council, reference 26/01148/FULL
Timeline
Dates from the published record
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24 Feb 2026
Received by Westminster
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30 Apr 2026
Decision issued: Granted subject to conditions
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21 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
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26/04985/FULL Awaiting decision
Northumberland House 155 - 157 Great Portland Street London W1W 6QP
Replacement of entrance door.
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26/00984/NMA Granted
Northumberland House 155 - 157 Great Portland Street London W1W 6QP
Amendments to planning permission dated 12th November 2024 (RN: 24/06018/FULL) for Alterations to the entrance at ground floor level and installation of plant with screening and associated equipment at roof level. Namely, omission of previously approved GRP housing at roof level, relocation of 1no 175mm x 450mm louvre integrated into the head of existing WC window; and introduction of 6no 500mmx500mm ventilation louvres to south west elevation.
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26/01015/FULL Awaiting decision
Hallam House 56 - 60 Hallam Street London W1W 6JL
Change of use of existing building to form 6 residential flats (Class C3), alterations to rear fenestration pattern, erection of single storey lower ground floor extension within rear lightwell to provide additional residential floorspace (Class C3) and replacement of an existing window with a door at front ground floor level.
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26/00825/ADFULL Awaiting decision
Hallam House 56 - 60 Hallam Street London W1W 6JL
Details of appropriate arrangements to secure measures to mitigate the potential increased demand for on-street residents car parking in the vicinity of the site pursuant to condition 4 of prior approval dated 11 March 2025 (RN: 25/00247/P3JPA).
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26/00826/ADFULL Awaiting decision
Hallam House 56 - 60 Hallam Street London W1W 6JL
Details of appropriate arrangements to secure measures to mitigate the potential increased demand for on-street residents car parking in the vicinity of the site pursuant to condition 18 of planning permission dated 19 November 2025 (RN: 25/04301/FULL).
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25/07298/ADV Awaiting decision
Hallam Street London
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26/04829/ADFULL Granted
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26/04841/ADFULL Granted
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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
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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.