OSHA requires 1 toilet for every 20 workers on a construction site, per 1926.51(c)(1), scaling to 1 toilet seat and 1 urinal per 40 workers once you pass 20. Sterling Heights job sites follow this same federal standard. There's no separate Michigan OSHA toilet count, so the math starts here.
Start with your peak headcount, not your average. Under OSHA 1926.51(c)(1), a crew of 20 or fewer needs 1 unit. Cross 20 workers and the ratio shifts to 1 toilet seat plus 1 urinal per 40 workers, then to 1 per 50 once you're at 200 or more. A 60-worker framing crew in Sterling Heights needs roughly 2 combination units, not 1. Run the numbers yourself with our how many porta potties do I need guide, or just call and give us a headcount. General industry sites, like warehouses instead of active construction, fall under 29 CFR 1910.141(c)(1)(i) instead, which uses a different table. Farms and agricultural crews have their own rule too: OSHA 1928.110 calls for 1 facility per 20 hand-labor employees, reachable within a quarter mile walk. If you're staffing a renovation crew under 20 people, a single standard porta potty rental usually clears the requirement. Bigger crews need a real plan, and that's where a porta potty rental checklist earns its keep before the inspector shows up.
OSHA itself doesn't set a hard footage number for how far a toilet can sit from the work area on a general construction site. What it does specify is the agricultural rule: 1928.110 requires field sanitation facilities within a quarter mile walk of hand-labor employees. For general construction, the practical standard is placing units close enough that workers actually use them instead of skipping the walk. Our porta potty placement guide covers what that looks like on an active Sterling Heights lot. Water matters here too: OSHA 1926.51(a)(1) requires an adequate supply of potable water at all places of employment, which is separate from the toilet count but gets checked alongside it. If your crew is spread across a wide footprint, like a subdivision build, stacking a few standard porta potty rental units at different points beats one bank of toilets far from half the workers.
Cal OSHA sets its own construction toilet standard in California, and it runs stricter than federal OSHA in some counts. Michigan follows federal 1926.51(c)(1) directly, since we don't operate under a separate state plan the way California does. If you're bidding out-of-state work or managing a crew that splits time between Michigan and a Cal OSHA state, don't assume the ratios match. Sterling Heights contractors sticking to local and regional jobs, including sites out toward Troy 6.7 miles west or Macomb 11.9 miles northeast, only need to plan against the federal table. Handwashing has its own separate trigger. OSHA 1926.51(f)(1) requires washing facilities specifically where workers apply paints, coatings, herbicides or insecticides, not as a general rule for every site. Pair that with 29 CFR 1910.141(d)(2), which requires soap and towels or a hand-drying device at wash stations; hand sanitizer alone doesn't satisfy it. A handwashing station rental covers both requirements in one unit if your crew works with coatings or chemicals.
ADA and OSHA are separate rules, and OSHA doesn't mandate accessible units on its own. ADA Standards 213.2 requires that where single-user portable toilets are clustered, at least 5 percent, and never fewer than 1 unit, be wheelchair accessible. Public-facing events in Sterling Heights, including anything with spectators or vendors, are more likely to trigger this than a fenced job site with crew-only access. Accessible units also need to meet ADA 403.5.1 for a 36 inch clear route and ADA 404.2.3 for a 32 inch door opening, plus a 60 inch turning circle under ADA 304.3.1. If you're running a race, festival, or golf outing rather than a construction site, check our ADA restroom requirements page before you order. For active builds, pairing standard units with roll-off dumpsters and temporary fence rental around the sanitation zone keeps the whole site organized and inspection-ready.
| unit | day | week | month |
|---|---|---|---|
| standard | $100-$350 | $130-$500 | $125-$325 |
| ada | $200-$400 | $185-$240 | - |
| deluxe | $85-$1200 | $150-$290 | - |
Delivery runs $100 to $500 for a day rental and $50 to $150 for a week, on top of the unit cost. See full breakdowns on porta potty rental cost or monthly porta potty rental before you set a budget.
Once your crew passes 20 workers, OSHA's ratio under 1926.51(c)(1) shifts from a single unit to 1 toilet seat and 1 urinal per 40 workers. A 25-person crew technically needs that second combination unit, not just one toilet. Round up when you're close to the line.
Yes. The ratio applies for the duration workers are on site, whether that's a single day tear-out or a six-month build. A weekend punch-list job still needs to meet the same per-worker count as a longer project, just scaled to your crew size that day.
Only if your total cluster count keeps you under the 5 percent threshold in ADA 213.2. Once you add more standard units, you may need a second accessible unit to stay compliant. Spread-out sites, like ones spanning several building pads, often need accessible units at more than one location.
Yes. Toilet counts fall under 1926.51(c)(1), while washing facility requirements under 1926.51(f)(1) only trigger with paints, coatings, herbicides or insecticides. A crew doing general framing may not need dedicated wash stations under that rule, even though a painting sub on the same site would.
An inspector can cite the site for insufficient facilities relative to headcount. The fix is usually fast: add units to match the current crew size under 1926.51(c)(1). Keep a copy of your worker count and unit count on hand so you can show the math if asked.
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