From the above stages

Loft 1 / Extension 1 Notification
Loft 2 / Extension 2 Inspection
Loft 3 / Extension 3 Inspection
Loft 4 / Extension 4 Inspection
Extension 5 Inspection
Loft 5 / Extension 6 Notification of Completion

N.B. 1 additional inspection has been allowed for at the start or end to suit.

Installer certificates required: Electrical, Unvented cylinder, Gas appliance

File Photo required: Damp proof membrane to ground floor slab