The federal E-Verify program has become an increasingly central feature of employment verification in the construction industry. Once a voluntary tool used primarily by federal contractors, E-Verify is now mandated, either broadly or for specific project types, by a growing number of states, and its role continues to expand under federal enforcement policy. For construction companies, which depend heavily on large, mobile workforces, and layered subcontracting relationships, E-Verify compliance presents unique operational and legal challenges. This article identifies the key practices construction companies should adopt to maintain compliance, highlights common good-faith mistakes that nonetheless expose contractors to enforcement risk, and examines the broader implications of continued E-Verify expansion for the construction labor market.