Five common mistakes in construction bids
The mistakes we see most often — and how to avoid them without changing your method.
After reviewing several hundred bids, certain patterns recur. Here are the five we see most often.
Forgetting contingencies. A 5-10% buffer for unknowns isn't optional: it's the difference between a profitable project and a loss.
Underestimating labour. Hours are systematically underestimated by 15-25% on first-pass estimates. Our historical data shows this consistently.
Not checking supplier prices. Prices move. A 2023 lumber quote can be 30% off by 2025.
Confusing gross quantity and waste-included quantity. A 100 sq ft floor with 15% waste needs 115 sq ft of material. Easy to forget.
Not validating assumptions with the client. "Is excavation in scope?" Ask before you bid.