If it were me I would not have bought from KB Home in the first place
because I have known about their problems for years. But had I been
the OP and discovered evidence of problems after signing a contract I'd
want out, too. KB has one of the worst reputations among tract home
builders and IMO it is well deserved. I don't put any stock in JD
Power because it's like saying, which dirty gym sock smells best, LOL!
Tract homes are notorious for being hastily slapped together with
unskilled labor. The companies can always outmaneuver you legally so
even if you're in the right, in a dispute, you can still lose. I would
never buy one again. I've owned a few, most were acceptable, but you
only have to have ONE construction defect case to get a real education
in how poorly these homes are built, and how easily the builders have
you over a barrell if there's a problem. Of all of them, KB is the
LAST I would buy from. Even when i was a naive new home buyer I was
seeing problems with them. To discover it after signing the contract
must be truly scary. Good luck, I hope you get out unscathed.