Article 677 of Civil Code

1 - If the work consists of several parts, or the consideration is determined on a unit basis, the contractor may collect consideration proportionate to the work completed after its inspection and acceptance, provided that what has been completed constitutes a distinct part or a section of sufficient importance in relation to the work as a whole, unless otherwise agreed. 2 - Work for which consideration has been paid is presumed to have been inspected and accepted, unless it is established that payment was made on account.