Gazzap8 ...I tend to start my first job between 09:00 - 09:30...as I think this is reasonable...but here in Holland...it is not unusual for builders to start drilling, hammering on domestic work at 07:30..
I could start earlier but I just don't like to... to be honest I think you may be a little over cautious but hey..only you know your customers.
Cheers
Dave,