Subsurface conditions, concealed obstructions, or unusual physical conditions can force work to proceed differently from the plan. When those conditions affect activities that control completion, differing site conditions delays can become both a scheduling issue and a contract issue. The analysis begins with what was represented, what was encountered, and what changed in the work.
A construction delay expert does not treat every unpleasant site surprise as a compensable event. Our delay analysis services examine the timing, contract records, schedule logic, and actual sequence so the claimed effect can be separated from other project conditions that may have existed at the same time.
What Qualifies as a Differing Site Condition
The controlling contract language matters. In federal fixed-price construction, FAR 52.236-2 addresses subsurface or latent physical conditions that differ materially from those indicated, as well as unusual unknown physical conditions that differ materially from those ordinarily encountered. Other contracts may define notice, entitlement, and risk allocation differently, so the analysis must start with the applicable terms.
How Site Conditions Affect the Schedule
A physical condition becomes a schedule issue when it changes planned work, access, sequencing, production, or the timing of successor activities. The schedule should show whether the event affected the critical path during the relevant period. A clear construction delay claim therefore needs more than proof that a condition existed; it needs a reasoned connection between the condition and project completion.
The schedule should also be reviewed for other causes operating during the same period. If access restrictions, design issues, procurement problems, or contractor-controlled events were already affecting critical work, the site condition may be only part of the explanation. A period-by-period review helps show whether the unexpected condition created new delay, extended an existing delay, or affected work that had available float. That distinction can materially change how the event is described and evaluated later in a claim. It can also affect the damages discussion.
Why Prompt Notice and Documentation Matter
Field photographs, daily reports, requests for information, correspondence, revised plans, cost records, and schedule updates can help establish when the condition was discovered and what happened next. The same principle appears in AACE Recommended Practice 29R-03, which emphasizes validating source data before performing forensic schedule analysis. Missing or inconsistent records can make later reconstruction more difficult.
Building a Clear Delay Analysis From the Evidence
At HPM Consultants, we review schedules and supporting project documents to identify the cause, timing, and effect of disputed delay events. Parties seeking a construction claims expert witness in San Diego can review our expert witness services to understand how schedule evidence may be evaluated in a dispute.
The goal is to explain what changed in the field, how the work responded, and whether project completion was affected. When a matter calls for a delay damages expert in Los Angeles, contact our team to discuss the available schedule and project records.