"Your local building department might have construction drawings for
the
original building permit, which might show where the shutoff is. "

How many building plans for a house would show that level of detail?
Usually, this is up to the plumber doing the work. And why even
bother? It's not rocket science you know. In a new house it should
be very easy to just follow the cold water pipe and see if there is a
valve or not.