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I am sorry to hear about this situation. No, his failure to provide a copy of the contract is not a violation of a statutory law. No law states that a contractor must give a copy of the contract if the owner asks for it (which is why it is so important to make a copy at time of signing for one's self).
However regardless, the contractor may still be sued for a bad job. Under New York law, an action for breach of contract means of (1) a contract; (2) performance of the contract by one party; (3) breach by the other party; and (4) damages. Rexnord Holdings, Inc. v. Bidermann, 21 F.3d 522, 525 (2d Cir. 1994).
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