In most states in this country, the contractor of new construction has liability for new construction well more than a one year warranty. In California, the statute of limitations for defective construction for a work of improvement is 10 years from issuance of the certificate of occupancy.You need to retain a licensed contractor to inspect the home, write up a report and come up with an estimate for repair. It seems that the actual developer and contractor would be on the hook for a construction defect as to your home. Depending upon what your retained contractor states in his report, you shouldmake a demand to the developer and the general contractor for repairs to the home regardless of the one year warranty.You should consult with a construction litigation lawyer about the problem with the home. If you are selling it, you need to disclose in writing the known problems you have observed to all potential buyers.Good luck.