The Napa County Hall of Justice Facility is a multi-story, detention and administration facility comprised of a North wing and South wing. The North wing was constructed in 1985. The South wing was constructed in 1987 as part of an expansion of the original building. The facility is considered to be a correctional facility and falls under the jurisdiction of the California Department of Corrections and Rehabilitation.
MK2 Engineers designed the mechanical and electrical systems for the project.