Does a construction contract have to be in writing?

No, an enforceable contract for a construction project can be oral provided that all of the legal requirements of a contract (identification of parties, consideration, description of work to be done, price to be paid, etc.) can be proven. However, reliance upon an oral agreement is not advised.  A written contract substantially reduces the chances of a dispute between the parties and can also provide for the manner in which any disputes are resolved.