Planning application
26/01650/FULL
103 St George's Square Mews London SW1V 3RZ
Proposal
Erection of a mansard roof extension and alterations to front and rear elevations.
As published by the council, reference 26/01650/FULL
Timeline
Dates from the published record
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13 Mar 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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26/01794/FULL Awaiting decision
103 St George's Square Mews London SW1V 3RZ
Erection of mansard roof extension, first floor rear extension and roof terrace, alterations to front and rear elevations.
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25/06565/LBC Granted
Flat 12 89 - 91 St George's Square London SW1V 3QW
Replacement of the fifth floor terrace doors with bi-fold doors and the installation of additional roof insulation.
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25/06564/FULL Granted
Flat 12 89 - 91 St George's Square London SW1V 3QW
Replacement of the fifth floor terrace doors with bi-fold doors and the installation of additional roof insulation.
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26/01499/FULL Awaiting decision
47 Aylesford Street SW1V 3RY
Replacement of existing roof coverings with natural slate and installation of four conservation rooflights: two to front roof slope and two to rear.
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25/06071/ADLBC Granted
97E St George's Square London SW1V 3QP
Details of salvaged materials (i.e. doors, architraves, skirtings) and details of their reuse pursuant to Condition 4 of Listed Building Consent dated 10 September 2024 (RN23/05375/LBC)
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26/00956/FULL Awaiting decision
Flat 1 111 St George's Square London SW1V 3QP
Internal alterations including the removal of non-historical windows, doors, sanitary ware, kitchen units and suspended ceilings. Installation of new double-glazed windows and patio door to the rear, new bathrooms and kitchen, and new suspended ceilings. Replacement of stair enclosure with new joinery. Alterations to rear patio including removal of existing tiles and installation of new stone pavers. [Linked to 26/00957/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.