Attorney answers to questions are for general purposes only and do not establish an attorney-client relationship. There are always specific facts that are important for an attorney to review before providing advice to a Client. In no way should you rely on the response provided herein to conduct your legal affairs on your own. You should always hire an attorney before you rely on advice provided.
The consumer fraud act, and the door to door home repair sales act, both require a written contract for improvements made to residential buildings. However, there is not law that requires a written contract for commercial buildings - though performing work without a contract would certainly be unwise and a recipe for a lawsuit. The lack of a written contract may preclude the contractor from asserting a construction lien.
If this answer was helpful, please mark it as helpful or as a best answer. This answer is for general education purposes only. It neither creates an attorney-client relationship nor provides legal guidance or advice. The answer is based on the limited information provided and the answer might be different had additional information been provided. You should consult an attorney.