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What Went Wrong with Project Cost Overruns: A Postmortem Review

By Glazix | June 4, 2025

Cost overruns don’t happen all at once—they grow quietly, driven by underestimated risks, vague scopes, and weak cost controls. In this blog, we walk through a distributor’s experience where project costs spiraled beyond budget and uncover the missteps that caused it.

The Incident: Oversized Custom Panels for a Government Project

A glass distributor committed to a fixed-price contract for oversized laminated IGUs on a courthouse project. The quote was competitive, but did not fully account for specialized handling equipment, oversized transport permits, or the learning curve for a new interlayer.

Midway through the job, site access issues led to rescheduling and crane rebookings. The interlayer had a higher defect rate than expected, requiring a 15% overrun in fabrication.

What Went Wrong

No buffer was built in for learning curve on new material

Access logistics were assumed based on prior site—not verified

Handling and crane costs were based on outdated regional rates

Financial Outcome

Final costs were 31% above original projection

Profit margin dropped from 22% to 6%

The client flagged the project for audit, affecting future bid consideration

Process Changes Introduced

Risk Factor Adjustment Model Applied

Bids are now adjusted using a weighted risk score based on site, scale, and material complexity.

Scope Review with Third-Party Validators

Complex jobs require secondary reviews of access, staging, and labor estimates.

Learning Curve Buffer Added for New SKUs

Any first-time materials now trigger an added buffer for time, waste, and quality control.

Takeaway for Distributors

Margins aren’t lost on-site—they’re lost in the quote. Overruns are the result of weak upfront assumptions, not downstream execution alone.


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