Planning application
26/04485/FULL
1B Chester Row London SW1W 9JF
Proposal
New basement extension (under the rear half of the building) to enlarge the existing basement (beneath the front half of the building), including creation of a new lightwell along the rear of the building.
As published by the council, reference 26/04485/FULL
Timeline
Dates from the published record
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6 Jul 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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25/05281/FULL Granted
1B Chester Row London SW1W 9JF
Extension at rear roof level, relocation of existing plant enclosure, simplification of roofscape including new roof maintenance access hatch.
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25/09022/LBC Granted
1 Chester Row London SW1W 9JF
Installation of scaffold fixings, removal and replacement of render and structural strengthening to cracks in underlying brickwork to front elevation.
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25/07677/FULL Awaiting decision
First Floor Flat 75 - 77 Elizabeth Street London SW1W 9PJ
Installation of replacement sashes within the existing box frames including new slimline double glazing and integral glazing bars to match the existing fenestration to the front and rear at first floor level; and other associated works. Linked with 25/07678/LBC
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25/07678/LBC Awaiting decision
First Floor Flat 75 - 77 Elizabeth Street London SW1W 9PJ
Installation of replacement sashes within the existing box frames including new slimline double glazing and integral glazing bars to match the existing fenestration to the front and rear at first floor level; and other associated works. Linked with 25/07677/FULL
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26/01481/ADFULL Granted
First Floor Flat 75 - 77 Elizabeth Street London SW1W 9PJ
Detailed drawings (including sections) of the replacement windows pursuant to Condition 4 of planning permission dated 19 February 2026 (25/07677/FULL).
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26/01482/ADLBC Granted
First Floor Flat 75 - 77 Elizabeth Street London SW1W 9PJ
Detailed drawings (including sections) of the replacement windows pursuant to Condition 3 of listed building consent dated 19 February 2026 (25/07678/LBC).
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.