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Do subcontractors count toward our OSHA porta potty headcount?

Carl D.asked 0 viewsConstruction & Job SitesOsha 1926 51ConstructionUnits per personStandard unitService frequencySubcontractors

We're a GC on a mid-size commercial remodel. Our own crew is about 12, but this week a framing sub brings another 10 and an electrician crew will bounce between 4 and 8 depending on the day. We currently have one standard unit on the site with weekly service.

I keep seeing the OSHA 1926.51 table talked about in terms of "number of employees." Does that mean only our payroll people, or does every warm body on site that day count toward the toilet ratio? The subcontracts are separate companies and they leave by 3 most days.

Just trying to figure out if we need a second unit before the sub ramps up, or if the one we have is fine for our headcount alone. Any supers who've dealt with this on multi-trade jobs?

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Deb K.Akron, OH

Every worker present on the job site counts toward the OSHA 1926.51 headcount, regardless of which company employs them. The OSHA standard applies to the site, not individual payrolls. Your crew of 12 plus the framing sub's 10 and the electricians' 4 to 8 puts you at 26 to 30 employees on site. OSHA 1926.51(c) requires one toilet for 20 or fewer workers, and for 20 to 199 workers it requires one toilet seat and one urinal per 40 workers. With 26 to 30 workers, you need at least one toilet seat and one urinal.

You currently have one standard unit, which counts as one toilet seat. You are short the urinal. The simplest and most common fix is to add a second standard unit. This meets the requirement for two 'toilet facilities' and avoids any potential citation. The fact that subcontractors leave early does not change the maximum headcount during the day.

You should also check if your site needs an ADA-compliant unit. The ADA cluster rule requires at least one accessible unit in any cluster of portable toilets. Since you are adding a second unit, you now have a cluster. Many GCs just swap one standard unit for an ADA-compliant unit to satisfy both OSHA and the ADA in one move. A weekly service visit is standard, but if use is heavy, you may need to increase the service frequency to prevent overfilling and odors.

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Jake W.Denver, CO

Yes, subcontractors count. Peak concurrent people on site that day is what you use for the OSHA 1926.51 headcount, not your payroll alone.

On multi-trade remodels we treat the high-water mark when the framer and electrician are both there. Your 12 plus 10 plus 4 to 8 lands you in the 20 to 199 band, where the table wants a toilet seat and a urinal per 40 workers. One standard unit is only the seat. Adding a second standard unit is the usual fix on jobs that do not want a separate urinal dropped.

Leaving early does not help if the peak mid-day count already clears 20. Same for weekly service: more bodies fill the tank faster, so ask whether that cadence still holds once the second unit is there. If you end up with two units in one spot, check whether one needs to be accessible so the cluster rule is covered.

OSHA 1926.51 is written around the site, not which company signs the paycheck.

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