Construction (Design and Management) Regulations 2015

They prepare the health and safety file.

If you want to get super specific about it, their statutory home is those CDM 2015 regulations, and it's tied to an approved code of practice known as L153.

OK, let me just make sure I'm visualizing this right.

This is the person who looks at the drawings and says, like, hey, if we put this heavy HVAC unit on the roof, there's no safe way for the crane operators to lift it without risking a collapse.