A construction security firm is a company that provides active or passive security monitoring at a construction site. Its main goal is to prevent damage or vandalism to the building under construction, or damage to or theft of equipment or materials on the site. Another goal is to reduce liability by preventing accidents resulting from unauthorized access to the site.

The service is security monitoring while construction is taking place. It protects the work, equipment, and materials and addresses unauthorized access, rather than only the security of the finished building.

A construction fence rental company supplies a physical barrier, while the security firm supplies monitoring. Height safety addresses workers' risk of falling, a different concern from unauthorized access and protection against theft or vandalism.