16 July 2026
Two dates, one autumn: the 30 September and 1 October 2026 double deadline
On 30 September 2026 the second staircase mandate takes effect for new residential buildings over 18m in England, and on 1 October 2026 the Building Safety Levy switches on. Together they are driving a surge of Gateway 2 submissions lodged ahead of the dates, and a rush is exactly when applications fail.
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