Get the site located for utilities, anything that comes up will fall on to the locating company(s). As for the Patio driveway etc, he can plainly see that they are there, it comes down to can he do the job himself or not?
But the last one, obstacles in excavation, that is going to fall on you, if he hits a boulder that is ten feet in diameter that he needs to remove, it could make something that costs him way more than his profit allows. I would be careful with what you allow him to get you on though, if it is just hard ground, then sorry, your problem, better luck next time. But something odd, like an old buried tank or something is not fair to charge him for.
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