8-1.12 Contract Types Generally, contracts for construction should be firm fixed price contracts. Such contracts may be: Lump-sum contracts for the total work or for defined parts of it. Unit-price contracts in which a unit price is paid for a specified quantity of work, such as cubic yards of earth or concrete, or square yards of pavement. A combination of both (of the above). However, any contract type discussed in Section 2-18, Select Contract Type and Period of Performance, may be used.