Construction Contracts and Disputes in California

Most contractor-client disputes are decided by documents that already exist before anyone is angry. In California residential work that document is regulated: Business and Professions Code section 7159 sets out what a home improvement contract must contain and when it must be signed, and the same rule reaches every change order that follows. This hub, reviewed by Jayson R. Elliott, covers the contract requirements and routes to the guides on change orders, drafting, and what to do when a dispute starts.

Section 7159(d) is the provision that produces most of the trouble. A home improvement contract, and any changes to the contract, must be in writing and signed by the parties prior to the commencement of work covered by the contract or an applicable change order.

Note what that sentence does. It applies the same timing rule to the original contract and to every change order — the signature has to precede the work, not follow it. The common industry practice of proceeding on a verbal approval and papering the change order at the next billing cycle is not what the statute describes.

This is also where the commercial consequence and the licensing consequence meet. A change order signed after the work is done is harder to enforce as a contract and is a compliance problem under the section at the same time.

The §7159(d) timing rule, in one line The contract and any change order must be in writing and signed by the parties BEFORE the work it covers begins. Same rule for both. A change order is not a lesser document under this section. The timing requirement is not qualified by the §7159.5(a)(8) bonding exemption — that exemption reaches the required-content list, not the writing-and-signing rule.

Section 7159(d) then lists required elements. Among them: the name, business address, and licence number of the contractor; the name and registration number of the home improvement salesperson who solicited or negotiated the contract, if applicable; a heading on the contract form identifying the type of contract, reading “Home Improvement,” in at least 10-point boldface type; and a statement in at least 12-point boldface type reading that the owner is entitled to a completely filled in copy of the agreement, signed by both the owner and the contractor, before any work may be started.

The typeface requirements are not decoration. The statute specifies point sizes and boldface, which means a contract that carries the right words in the wrong format has not complied. Section 7159(e) separately requires a set of notices to be provided to the owner as part of the contract form.

The full list is longer than this page reproduces, and a contractor auditing their own template should work from the statute rather than from a summary. The contract drafting guide beneath this page goes through it.

Section 7159 sits in the Contractors State License Law rather than in the Civil Code. That placement is the point: the contract requirements are licensing obligations, and a contract that does not comply is a licensing exposure alongside whatever it does to the contractor’s position in a payment dispute.

The practical reading is that contract compliance belongs in the same category as licence renewal and bond maintenance — an operating requirement checked periodically, not a document reviewed once when the business started. The licensing pillar on this site covers discipline grounds and the payment consequences that follow a compliance failure.