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Top 5 Mistakes Contractors Make When Bidding on Projects

Accurate construction estimates are the backbone of successful projects. Many contractors lose bids or profits because of small but critical mistakes in their estimating process. Here are the top 5 mistakes to avoid for more accurate project bids.

John Williams

11/15/20251 min read

two men working
two men working
Top 5 Mistakes Contractors Make When Bidding on Projects

Accurate construction estimates are the backbone of successful projects. Many contractors lose bids or profits because of small but critical mistakes in their estimating process. Here are the top 5 mistakes to avoid for more accurate project bids.

1. Underestimating Project Costs

Underestimating labor, materials, or equipment costs is a common mistake in contractor estimating. While a low bid might attract clients, it can quickly lead to losses.
Tip: Use a detailed estimating sheet or digital tools to include all costs, plus a small buffer for unexpected expenses.

2. Overlooking Project Details

Ignoring the specifications and requirements of a project can result in missed items or miscalculations.
Tip: Carefully review plans and documents to ensure your construction estimates are complete and precise.

3. Failing to Account for Time

Bids that focus only on cost without considering project duration can cause scheduling issues or overtime expenses.
Tip: Break the project into phases and estimate labor hours and equipment needs to create realistic and accurate project bids.

4. Relying on Guesswork

Some contractors base their estimates on intuition rather than data. This approach often results in overpricing or underpricing projects.
Tip: Use software or spreadsheets for contractor estimating to ensure every cost is calculated accurately.

5. Skipping Contingency Planning

Unexpected delays, weather issues, or supply shortages can turn a profitable bid into a loss.
Tip: Include a contingency (5–10% of total costs) in your construction estimates to cover unforeseen challenges.

Conclusion

Creating accurate construction estimates is essential for winning more contracts and protecting your profits. Avoid these common mistakes and leverage digital contractor estimating tools to save time and reduce errors.

Call to Action:
Want help with precise and efficient construction estimates? Contact us today for a free consultation and sample estimate.