Works of improvement: progress payments: notice: retention proceeds.

(1) Existing law requires that, for private and public works of improvement, and in a public works contract, a prime contractor or subcontractor pay to any subcontractor, not later than 10 days after receipt of each progress payment, unless otherwise agreed to in writing, the respective amount allowed the contractor on account of the work performed by the subcontractors, to the extent of each contractor's interest therein, as prescribed.