5 Bid Day Mistakes That Cost Contractors Money

Most bid-day losses aren't dramatic — they're small, repeated oversights that add up across a project. Here are five of the most common.

1. Missing scope buried in specifications

Not every requirement shows up on the drawings. Specification sections frequently carry scope (testing, mockups, warranties) that never appears as a drawn line item.

2. Pricing from an outdated addendum

Late-arriving addenda are easy to skim past under deadline pressure, and a missed scope change is one of the fastest ways to underbid a job.

3. Underestimating general conditions

Division 01 items — mobilization, temporary facilities, project management — are often estimated too quickly relative to how much they actually cost over a project's duration.

4. Not separating material and labor

A single blended rate makes it harder to catch errors and harder to price change orders accurately later.

5. Skipping the cross-check

A second pass — even a quick one — catches transposed quantities and unit mismatches that a single takeoff pass usually misses.