I suggest you stay away from that kind of work. Around here, ALL builders want the install work done dirt cheap. They have no loyalty to anyone, and will change to someone else if they find they can save $5.00 on a $5,000 install job.
It might be different in your area, but around here, there is little money to be made working for homebuilders. Oh, good luck on getting paid on a timely basis, also.