Reply #3: I don't

[Wheezy]

think it matters that he's right-wing in this situation. Just my opinion.
When we added on to our house, it was my responsibility to contact MISSDIG, to get the cables marked.
Have you talked to the guy about it since all this happened? If you have, and he refuses to do the right thing, then perhaps call the construction company's manager/owner first before taking any legal action. If that person refuses to deal with it, you've got some rights, I imagine, to do something about it legally.

Document everything--dates/times of calls, who you spoke to, what was said, etc.