(a) A contract subject to this chapter must be in writing.
(b) A disaster remediation contractor:
(1) may not require a person to make a full or partial payment under a contract before the contractor begins work;
(2) may not require that the amount of any partial payment under the contract exceed an amount reasonably proportionate to the work performed, including any materials delivered; and
(3) shall include in any contract for disaster remediation services the following statement in conspicuous, boldfaced type of at least 10 points in size: "This contract is subject to Chapter 58, Business & Commerce Code. A contractor may not require a full or partial payment before the contractor begins work and may not require partial payments in an amount that exceeds an amount reasonably proportionate to the work performed, including any materials delivered."