Most contract failures in major infrastructure projects are not legal failures. They are structural failures — predictable consequences of decisions made during contracting that produce cost escalation, scope drift, and disputes during execution. The mistakes are consistent across project types, and most are preventable with structural review before signing.
This article identifies the seven contract mistakes that most consistently cause infrastructure projects to fail.
Mistake 1: Defining Scope Loosely
Loose scope definition is the most common contract mistake, and the most expensive. When scope is described rather than specified, change-order economics fill the gap — and change orders are priced at higher margins than original scope. The pattern is examined in detail in our pillar on hidden risks in infrastructure contracts.
Mistake 2: Accepting Vendor-Drafted Risk Allocation
Contracts drafted by vendors allocate risk to vendor advantage by design. This is not vendor misconduct — it is the predictable outcome of one-sided drafting. Owners who accept vendor-drafted risk allocation without structural review consistently absorb costs they could have negotiated out.
Mistake 3: Time-and-Materials Without Caps
Time-and-materials contracts reward duration. Without caps, milestones, or independent oversight, they consistently produce cost escalation. The structural dynamics are detailed in how vendors structure contracts to protect themselves.
Mistake 4: Measuring Activity Instead of Outcomes
Hours worked, milestones reached, deliverables submitted — these measure execution, not value. Contracts that measure activity reward vendor effort rather than owner outcomes. Stronger contracts measure outcomes: functional performance, integration success, long-term operational performance.
Mistake 5: Weak Change-Order Provisions
Change orders are the most common mechanism for cost escalation in complex projects. Contracts without strong change-order provisions — caps on margin percentages, pre-agreed pricing for common categories, independent verification — consistently produce cumulative change orders that exceed the original contract value.
Mistake 6: Ambiguous Acceptance Criteria
Acceptance criteria define when work is “done.” Ambiguous criteria permit substandard performance and create disputes. Strong acceptance criteria are specific, measurable, and tied to owner-relevant outcomes — not just to vendor-defined deliverables.
Mistake 7: Skipping Independent Structural Review
The most consequential mistake is signing contracts without independent structural review. Internal legal review evaluates legal risk — important, but different from structural risk. Structural review evaluates risk allocation, incentive alignment, and execution dynamics. The function is detailed in our pillar on independent owner representation.
Closing
Contract mistakes are structural in origin. They are predictable, preventable, and significantly cheaper to address before signing than after. Owners who recognize these patterns and address them upfront consistently see better project outcomes — not because their vendors are different, but because their contracts are structurally designed to align with owner outcomes.
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