A valuation is the process in which the completion of a certain amount of works carried out by the Contractor, is verified by the Contract Administrator prior to requesting a payment from the Client.

Payment certificates (Interim Certificates / Final Certificate) are issued by the Contract Administrator for completed work – whether reaching agreed milestones or for partial completion calculated in a percentage of the total amount of works.

Therefore it is always the valuation that comes first before issuing a payment certificate.