If the contractor for your project tells you something that's too good to be true, it probably is.
Documentation is the best protection.
And take pictures of the job at various stages. That way, when walls are closed up, there's no argument about whether the insulation was added or the wiring updated. If your contractor is clearly being dishonest, bar him from the job site, and report the matter to the Better Business Bureau, the local building inspector and the state attorney general's office. Contact your lawyer to find out about enforcing the contract, punishing the contractor and seeking redress. Today's Homeowner, a division of Times Mirror Magazines.