The short answer
Secure a construction site with layers that reduce easy access, improve detection, and produce a clear response. Begin with a site-specific assessment: identify perimeter gaps, vehicle entrances, pedestrian access, valuable tools and materials, fuel, temporary utilities, blind spots, delivery patterns, and the hours when legitimate activity stops. Risks change as fencing, buildings, inventory, and subcontractors change, so reassess throughout the project.
What to know
Core controls can include fencing and locked gates, adequate lighting, key and credential management, marked restricted areas, secured tool and material storage, asset inventories, delivery verification, cameras, alarm or notification systems, and disciplined end-of-shift checks. On-site guards can control entry, document vendors, patrol changing work areas, notice hazards, challenge or report unauthorized presence according to post orders, and coordinate with police or project management. Mobile patrol may suit intermittent checks; portable solar camera towers can add visible recording coverage at selected outdoor locations. Arrow offers all three approaches and states that towers are intended to supplement on-site officers.
The security plan should define who is authorized after hours, emergency contacts, patrol checkpoints, report contents, incident preservation, and procedures for fire, weather, injury, or utility failure. Security personnel entering active work zones also need site orientation and appropriate PPE. No single guard, fence, or camera guarantees prevention; the best result comes from coordinated controls and consistent follow-through.