How will he sign it off then?
To be fair Alarm.
I seem to get rather a lot of work involving distribution to outbuildings and i certainly dont mind the customer doing the grunt work. If the customer wants to dig and lay and stick tape down, then i am happy to pop in and see the cable layed before they back fill.
Now I know someone is going to reprimand me for this but on a couple of occassions i have not been able to get there before they back fill so i have asked them to take photos of install with cable and tape and a tape measure of depth at a couple of points. These would be added to my records as usual.
Admittedly i would rather do the glanding, only because i enjoy it!!