Planning application
26/01573/FULL
9 - 10 Northumberland Place London W2 5BS
Proposal
Erection of a mansard roof extension and solar panels at no. 10 Northumberland Place
As published by the council, reference 26/01573/FULL
Timeline
Dates from the published record
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11 Mar 2026
Received by Westminster
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13 Mar 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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25/07540/ADFULL Awaiting decision
3 Northumberland Place London W2 5BS
Detailed drawings showing the revised detailed design of dormers, to include slimmer cheeks and roof (elevations at 1:50, plus detailed elevations and sections at 1:10) pursuant to condition 4 of planning permission dated 19th June 2025 (RN:25/01772/FULL)
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25/07538/ADFULL Awaiting decision
3 Northumberland Place London W2 5BS
Detailed drawings of new railings, new bin store, new lightwell porch, method statement explaining the measures you will take to protect the trees on and close to the site and details of the foundations of the bin stores pursuant to conditions 4, 5 and 7 of planning permission dated 13th February 2025 (RN:24/07005).
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26/00800/TCA Awaiting decision
3 Northumberland Place London W2 5BS
Magnolia growing in the front left hand corner of the front garden of 3 Northumberland Place, tree 1 on the attached plan. Fell, remove stump and main roots. Reasons - poor specimen with low amenity value and no real scope for improvement. To be replaced, together with a replacement for the recently removed cotoneaster (ref 25/03383/TCA) Proposed replacements to be agreed with Westminster, we suggest Japanese maple, silverbell tree or similar small / medium ornamental tree.
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26/01468/TCA Granted
15 Northumberland Place London W2 5BS
1 x Silver Birch (T9, rear): Trim crown by 20%
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26/04449/LBC Awaiting decision
Ground Flat 39 Chepstow Road London W2 5BP
Internal layout alterations (Retrospective)
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26/01557/FULL Awaiting decision
46 Northumberland Place London W2 5AS
Rear lower ground floor infill extension with associated landscape works to front and rear alongside internal reconfiguration.
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.