Cal. Pub. Contract Code § 20128.5
Notwithstanding any other provisions of this article, the board of supervisors may award individual annual contracts, none of which shall exceed three million dollars ($3,000,000), adjusted annually to reflect the percentage change in the California Consumer Price Index, for repair, remodeling, or other repetitive work to be done according to unit prices. No annual contracts may be awarded for any new construction. The contracts shall be awarded to the lowest responsible bidder and shall be based on plans and specifications for typical work. No project shall be performed under the contract except by order of the board of supervisors, or an officer acting pursuant to Section 20145.
For purposes of this section, "unit price" means the amount paid for a single unit of an item of work, and "typical work" means a work description applicable universally or applicable to a large number of individual projects, as distinguished from work specifically described with respect to an individual project.
For purposes of this section, "repair, remodeling, or other repetitive work to be done according to unit prices" shall not include design or contract drawings.
Ca. Pub. Cont. Code § 20128.5