What's the OSHA rule for a 120-worker site with multiple buildings under construction?

The OSHA rule for a 120-worker site requires one toilet seat and one urinal per 40 workers for the entire site, not per building. That's three toilets and three urinals total. OSHA 29 CFR 1926.51 applies to the whole worksite if crews can move between buildings. If each building has a separate crew with no shared access, you might treat them as separate sites, but that's rare in practice.

Place the units centrally where all crews can reach them without long walks. A cluster near the site entrance or a central path works best. Include at least one ADA-compliant portable toilet to meet the 5 percent rule for clusters.

Service weekly is standard, but add mid-week pumping if units fill up fast or in summer heat. Make sure the vacuum truck can get within 25 feet of every unit on service day.

Use standard units for cost and durability. Add a handwash station at each cluster. For a long-term site, consider a restroom trailer if you have power and water hookups, but it costs more.

Post your site layout or crew details if you need help with placement.