Cal. CIV § 921

(a) In the event that a resolution under this chapter involves a repair by the builder, the builder shall make an appointment with the claimant, make all appropriate arrangements to effectuate a repair of the claimed unmet standards, and compensate the homeowner for all damages resulting therefrom free of charge to the claimant. The repair shall be scheduled through the claimant’s legal representative, if any, unless he or she is unavailable during the relevant time periods. The repair shall be commenced on a mutually convenient date within 14 days of acceptance or, if an alternative contractor is selected by the homeowner, within 14 days of the selection, or, if a mediation occurs, within seven days of the mediation, or within five days after a permit is obtained if one is required. The builder shall act with reasonable diligence in obtaining any such permit.

(b) The builder shall ensure that work done on the repairs is done with the utmost diligence, and that the repairs are completed as soon as reasonably possible, subject to the nature of the repair or some unforeseen event not caused by the builder or the contractor performing the repair. Every effort shall be made to complete the repair within 120 days.