The only problem is, the law in many states require mark out for all dig and post or rod work, the law does not say if you think the odds are astronomical, you don't have to notify..........
I'm not advocating forgoing locates just because it's a new house. I'm just saying that on new resi construction, many times it's painfully obvious where stuff is buried just by going out and eyeballing the place.
Typically, when I call for a locate on a new house, there's nothing to locate. The water & sewer lines are only stubbed out and have yet to be run out to the street, and the gas line has not been trenched in either. Cable TV and telephone are usually knifed in after the sod goes down (unless the ground is frozen, so the utility simply waits for spring), by which time I'm long gone.
I remember calling for locates on a new hotel so we could trench in the lot lights. The day after everything was located, we headed out with a bunch of PVC and the DitchWitch. Not 50' into digging, up comes the plastic gas line. We pulled it about 20', so it was broken somewhere, and that somewhere was under the paved parking lot. Naturally, we were at first expected to pay for the repairs, but no, it wasn't marked because it was so new it didn't show up on the locators' map yet. So the plumber bore in a new gas line using the locators' checkbook.