345. Instalment payments.

Most building or engineering contracts expressly entitle the contractor to be paid instalments of the contract sum.

A contractor under a construction contract1 is entitled to payment by instalments, stage payments or other periodic payments for any work under the contract unless it is specified in the contract that the duration is to be less than 45 days, or it is agreed between the parties that the duration of the work is estimated to be less than 45 days2. The parties are free to agree the amounts of the payments and the intervals at which, or circumstances in which, they