26/00858/FULLPlanning Application 26/00858/FULL
Full application at 3 St James's Square London SW1Y 4JU, Westminster. View planning documents, track the decision and get email alerts on updates.
Alterations to the St. James's Square facade including replacement of windows and entrances, at main roof level addition of roof pavilion extension, plant equipment and enclosures, with roof terraces at eight and ninth floor levels and a rear extension to accommodate a lift shaft and associated works.
26/00858/FULL
3 St James's Square London SW1Y 4JU
This is a full planning application for a rear extension at 3 St James's Square London SW1Y 4JU. Westminster has handled 4,496 applications of this type and approves 84% of them, typically deciding them in 73 days. It was submitted on 12 February 2026 and is still awaiting a decision. The site is in a conservation area. There have been 3 other applications at this address. In the past year there have been 594 applications across St James's. We hold 806 applications in total for the SW1Y postcode area.
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Application Details
Applicant & Agent
Planning Application Dates
Planning Decision
Publicity
Appeal
Additional Information
Source: Westminster