What's the OSHA rule for a 25-person crew on a 3-story building?
One standard portable toilet is enough for a 25-person crew on your three-story building. This meets the minimum requirement of OSHA 29 CFR 1926.51. The standard says 20 or fewer workers require one toilet. For 20 to 199 workers, it requires one toilet seat and one urinal per 40 workers. Since you have 25 people, one unit satisfies the rule.
OSHA Minimums for Construction
The OSHA construction sanitation standard is the baseline. It does not require a separate urinal or an ADA-compliant portable toilet for a crew of 25. A mobile crew with immediate access to a permanent restroom off-site can be exempt, but your framers and electricians are on-site all day.
Planning for Practical Use
A single standard unit works, but consider the crew's needs. Electricians and framers have different break schedules. One unit for 25 people means potential lines. For a long-term project, a second unit or a deluxe portable toilet with a sink improves morale. Weekly service visits are standard. In summer heat, you might need service every five days to control odor.
Placement and Service Access
Place the unit on level ground within 25 feet of where the vacuum truck can park. Ensure truck access is clear every service day. A blocked unit results in a missed service and a bill for the trip. On a three-story building, you do not need a high-rise unit; ground-level placement is fine.
Post your specific site details if you want advice on adding a unit or dealing with a tricky placement.