Introduction

Sitework is one of the first and most expensive phases of a project. A small mistake in estimating excavation, grading, utilities or concrete can lead to large financial losses or rejected bids. Most contractors lose money on sitework not because of execution — but because of the estimate.

Below are the most common mistakes in sitework estimating — and how to avoid them.

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1) Incorrect Cut & Fill Calculations

Even a small variance in elevation or soil volume can change costs drastically.

Fix: Use Civil 3D, AGTEK or Bluebeam takeoff — not manual guesswork.

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2) Ignoring Haul Distances and Dump Fees

Hauling and disposal often cost more than excavation itself.

Fix: Always include trucking, fuel, dump fees and distance factors in the takeoff.

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3) Not Accounting for Soil Conditions

Wet soil, rock, or unsuitable material can double excavation cost.

Fix: Review geotechnical reports and apply correction factors.

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4) Missing Utility Crossings & Conflicts

Uncounted trenching, rerouting or protection leads to costly change orders.

Fix: Overlay utility plans and coordinate scopes before pricing.

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5) No Contingency or Waste Allowance

Perfect drawings do not exist — conditions change in the field.

Fix: Add realistic contingency & waste factors based on project type.

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6) Bidding Without Marked-Up Plans

Unmarked numbers increase the risk of misunderstanding and disputes.

Fix: Provide highlighted drawings that clearly show scope and limits.

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7) Rushing Estimates Due to Lack of Time

Most inaccurate sitework bids happen because the contractor is estimating last-minute.

Fix: Outsource early to meet deadlines with proper detail.

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Conclusion

Sitework requires precision. Even a small oversight can cost thousands of dollars. Professional sitework estimating helps you:

• Protect your profit
• Avoid disputes and rework
• Submit stronger and more reliable bids
• Win projects with confidence

The difference between winning a bid and losing money often starts at the estimate.