John,
If it is a small repair, you may want to test out a product at Lowes. Homax ceiling texture. I'd suggest trying it on a scrap piece of drywall (make sure it's at ceiling height for testing). ... read more
A lawyer is the first place to start. Your builder should be insured for problems like this. If it is a big box builder then I am sure something in the corporate contract has an answer for this. You d ... read more