Planning application
PP/26/01705
15 Chelsea Square, London, SW3 6LF
Proposal
Construction of a single-storey basement extension, reconfiguration of the open space/garden at the rear of the property at both basement and ground floor levels, replacement of the L-shaped external concrete staircase with a steel spiral staircase, realignment of the rear wall of the main basement accommodation outwards by 1.5 metres into the paved external area, proposed extension of the ground floor rear terrace by approx. 0.7m over the top of the extended basement accommodation and window fenestration alterations to cinema room.
As published by the council, reference PP/26/01705
Timeline
Dates from the published record
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8 Mar 2026
Received by Kensington and Chelsea
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10 Jun 2026
Decision issued: Grant Planning Permission/Consent
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20 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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PP/24/05884 Granted
15 Chelsea Square, London, SW3 6LF
Installation of five air conditioning units within a louvered acoustic enclosure at rear of second floor roof terrace
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ARB/26/01031 Granted
23 Chelsea Square, London, SW3 6LF
FELL 1x Gleditsia at rear
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CON/26/00449 Granted
15 Chelsea Square, London, SW3 6LF
Details required by condition 7 (Contamination - Verification Report) of planning permission 23/02435 (Construction of single-storey basement extension below footprint of property; demolition of rear single-storey flat roof structure; replacement windows at courtyard elevation; replacement of 4 windows and door with French doors; replacement of railings on parapet wall around second floor roof terrace).
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CL/26/01546 Granted
15 Chelsea Square, London, SW3 6LF
Replacement of six existing windows and door on ground floor side elevation with a pair of French doors with side-lights and bay window;in white painted hardwood (Certificate of Lawful Proposed Use/Development)
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CON/26/01382 Granted
14 Chelsea Square, London, SW3 6LF
Details required by Condition 3 (timber screening) of planning permission PP/25/02407 (Installation of air conditioning units, and retention of timber screen fence and doors with sidelights on second floor roof terrace)
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CON/25/04789 Withdrawn
15 Chelsea Square, London, SW3 6LF
Details required by condition 7 (Contamination - Verification report) of planning permission 23/02435 (Construction of single-storey basement extension below footprint of property; demolition of rear single storey flat roof structure; replacement windows at courtyard elevation; replacement of 4 windows and door with French doors; replacement of railings on parapet wall around second floor roof terrace)
Other full applications applications
In Kensington and Chelsea
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PP/18/01985 Withdrawn
Flat 3, 24 Cornwall Gardens, London, SW7 4AW
Works to second floor flat including erection of rear extension, creation of external roof terrace areas above and to rear of said extension (with perimeter metal railings), together with internal alterations including removal of internal wall between kitchen and living room, and other refurbishment works
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PP/26/02078 Granted
Ruskin House, 35A Hyde Park Gate, London, SW7 5DN
Installation of 2no. roof mounted ASHPs including acoustic enclosure / screening.
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PP/26/02247 Withdrawn
41 Halsey Street, London, SW3 2PT
Refinements to lower ground floor conservatory and basement extension through removal of low external wall, installation of full height sliding doors, and reinstatement of larger external steps. Replace glazed flat roof at ground floor level with glass-box extension incorporating solid floor structure and internal walk on rooflight. Installation of glazed sliding doors out to a Juliet balcony with metal railings balustrade. Create access from living room by lowering sill of window to form archway; Single-storey extension to closet wing, aligning depth with No.?40 Halsey Street. New timber-framed glazed doors to the rear of extended wing. Widening opening to half-level study within partition to accommodate new double doors. Sunroom will include full-height sliding doors and Juliet balcony with painted or PPC metal balustrades.
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PP/26/02237 Granted
134 Brompton Road, London, SW3 1HY and 5 Cheval place, London, SW7 1EW
Change of use from Use Class E to Restaurant (Use Class E(b)), new recessed front bifolding doors, awning, and signs at front and rear, replace rooflights to double glazed hipped white UPVC/aluminium painted white, replace rear doors to match existing
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PP/26/02978 Granted
59A Palace Gardens Terrace, London, W8 4RU
Variation of Condition 2 (Compliance with approved drawings) of planning permission Ref. PP/24/07747 dated 28th February 2025, to replace proposed front and rear elevation drawings with new proposed drawings representing modest elevational changes of main building at first floor level only.