I've posted this question to a couple of plumbing forums also but
thought I'd see if anyone here could answer me too?

Our builder put in our plumbing rough-in and I have two questions about
what is the usual and customary way to do this.

We were left with just the pipe stub sticking out of the concrete for
the shower and toilet pipes
The toilet pipe is 3" white plastic, PVC probably?

There is no space around it to add the toilet flange? This seems like
a stupid way to leave a rough-in if we have to bust up the concrete
floor to put the flange in? Is this the customary way a basement
rough-in is done on new construction? Is there a way to add the toilet
flange without busting the concrete or raising the toilet?

Also, I'm going to contact the builder because the distance from the
toilet rough-in to the tub/shower drain is too close to meet the code
of 15" clear space from the center of the toilet to the edge of a
standard tub (the way the rough-in is supposed to be laid out. Finally
in order to place the vent pipe inside the same wall running behind the
toilet, it only leaves 11.5" of space to the back of the toilet and as
I'm sure you know 12" is the required amount of space. I think we
could squeeze a toilet in here, but the flange is an issue as is the
distance from the shower/tub

Thank you for any advice in advance,
Kim