Which bid method is preferred when quantities uncertain?

Which bid method is preferred when quantities uncertain?

• A. Time-based bidding
• B. Unit price
• C. Lump sum
• D. Cost-plus

Answer: (B)

When quantities are uncertain, you want a pricing approach tied to actual build quantities rather than a fixed total. Unit-price bidding does that by using predefined unit costs for specific work items. As the project progresses and quantities are measured, payment is simply unit cost times actual quantity. This provides price flexibility and transparency, letting changes in scope be absorbed without renegotiating a fixed price. The contractor accepts some quantity risk, but the owner gains a practical way to handle unknowns and adjust payments based on what is actually required. In contrast, a lump-sum contract fixes the total price, which can misalign with final quantities; cost-plus reimburses costs plus a fee and can lead to cost creep; time-based pricing pays for labor hours regardless of the actual quantity, which is inefficient when work volume is the driver of cost.

When quantities are uncertain, you want a pricing approach tied to actual build quantities rather than a fixed total. Unit-price bidding does that by using predefined unit costs for specific work items. As the project progresses and quantities are measured, payment is simply unit cost times actual quantity. This provides price flexibility and transparency, letting changes in scope be absorbed without renegotiating a fixed price. The contractor accepts some quantity risk, but the owner gains a practical way to handle unknowns and adjust payments based on what is actually required. In contrast, a lump-sum contract fixes the total price, which can misalign with final quantities; cost-plus reimburses costs plus a fee and can lead to cost creep; time-based pricing pays for labor hours regardless of the actual quantity, which is inefficient when work volume is the driver of cost.