Why Geotechnical Reports Cost Contractors Money
And How to Fix It Before Construction Starts
By Nathan McNallie | MCS Geotechnical Engineering
Introduction
Geotechnical reports are meant to reduce risk on construction projects. In reality, they often become a hidden source of added cost.
The issue is not that the reports are incorrect. Most are technically sound. The problem is how they are interpreted and applied in real-world construction.
MCS focuses on identifying where geotechnical recommendations quietly increase cost and how those issues can be addressed before construction begins.
Where Projects Lose Money
One of the most common cost drivers is the use of blanket recommendations. For example, a report may call for a uniform undercut across an entire building pad. In practice, subsurface conditions often vary significantly across a site. Applying a single requirement everywhere can lead to unnecessary excavation and material replacement.
Another issue is the use of conservative design assumptions. Engineers often include additional safety margins due to limited data or liability concerns. While this approach is understandable, it can result in foundations that are more robust—and more expensive—than required.
Geotechnical reports also frequently lack constructability context. Recommendations may not fully account for equipment limitations, site access, or construction sequencing. This disconnect can lead to inefficiencies and delays once work begins.
Ambiguity in report language can further complicate matters. When recommendations leave room for interpretation, different parties may make different decisions in the field. This inconsistency often results in change orders and disputes.
The Real Impact on Construction
These issues tend to show up in predictable ways. Excavation quantities increase beyond what was originally anticipated. Imported material costs rise. Schedules are extended due to unforeseen site conditions or unclear direction.
In many cases, these impacts are accepted as part of construction risk. However, they are often preventable with a more detailed review of the geotechnical report before work begins.
What Smart Project Teams Do Differently
Projects that stay on budget tend to approach geotechnical reports more proactively. Instead of accepting recommendations at face value, they take the time to understand the assumptions behind them.
They look closely at soil variability across the site and adjust their approach accordingly. They evaluate whether conservative design parameters can be refined without increasing risk. They also ensure that geotechnical recommendations are fully aligned with construction plans and specifications.
Most importantly, they review the report early—before bidding or construction—when adjustments can still be made without impacting the schedule.
MCS works with project teams to provide this level of practical review, helping align geotechnical recommendations with real construction conditions.
A Simple Way to Think About It
A geotechnical report is not a set of fixed instructions. It is a technical document that requires interpretation.
When it is treated as a checklist, projects tend to absorb unnecessary cost. When it is reviewed and applied strategically, it becomes a tool for reducing risk and improving efficiency.
Conclusion
Geotechnical reports do not inherently increase project cost. Misinterpretation does.
By taking a practical, construction-focused approach to review, project teams can avoid unnecessary work, reduce risk, and improve overall project outcomes.
MCS provides independent geotechnical review services to help contractors and developers make better decisions before construction begins.
About the Author
Nathan McNallie is a senior geotechnical consultant with experience in construction materials testing, report review, and construction advisory services. He specializes in identifying risk, improving constructability, and providing practical recommendations for foundation and earthwork design.
