A construction crew of 20 workers or fewer needs 1 toilet under OSHA 1926.51(c). Add a unit for every 40 workers past that point, up to 200. Events run differently: figure 1 standard unit per 50 guests for a 4 hour event without alcohol. Below we break down both, with worked examples.
Start with the OSHA bracket table, not a guess. Under OSHA 1926.51(c), a crew of 20 or fewer gets 1 toilet facility. From 20 up to 200 workers, add 1 toilet seat and 1 urinal per 40 workers. At 200 or more, the ratio drops to 1 seat and 1 urinal per 50 workers. A 35-person framing crew in Sterling Heights lands in the second bracket: 1 base unit plus roughly 1 more per 40 heads, so 2 units covers it with room to spare. Multi-week jobs should also plan around standard porta potty rental service intervals, since ANSI/PSAI Z4.3 sets a baseline of one service visit per week for up to 10 users over a 40 hour week. Bigger crews need more frequent pumping, not more units, once you are within the bracket. If your GC is scoping a whole construction site services package, toilets are just the first line item; fencing and a dumpster usually follow.
Events don't run on OSHA brackets. They run on headcount, hours, and whether beer is involved. Here's a rough guide by hours and guest count for a standard unit:
| guests | 4 hours | 8 hours |
|---|---|---|
| 100 | 2 units | 3 units |
| 250 | 4 units | 6 units |
| 500 | 8 units | 11 units |
Alcohol service pushes bathroom trips up noticeably, so add 10 to 15 percent more units to any number above. A wedding at a Sterling Heights venue with 150 guests over 6 hours with a bar should plan for 4 to 5 standard units rather than the bare 3. Multi-day festivals need a service plan too, not just more toilets sitting unused between days. If your event skews upscale, look at a deluxe flushable porta potty instead of a standard unit, and pair it with ADA accessible porta potty options per the accessibility rule below.
Yes, if you're clustering portable toilets for public use. ADA Standards section 213.2 requires that at least 5 percent of clustered single-user units be accessible, with a minimum of one no matter how small the cluster. That means even a 3-unit event setup in Sterling Heights needs 1 ADA unit. The accessible unit itself has to meet real dimensions: a 60 inch turning circle per ADA 304.3.1, a 32 inch clear door opening per ADA 404.2.3, and an accessible route at least 36 inches wide per ADA 403.5.1. Ground conditions matter too. ADA 302.1 requires the surface under and around the unit be stable, firm and slip resistant, which rules out loose gravel or soft turf without matting. Check the full ADA accessible porta potty page for placement specifics, or use the porta potty placement guide before your delivery truck shows up.
A 20 yard dumpster generally holds 2 to 3 tons of mixed debris, depending on material density. It measures out to roughly 20 by 8 by 4 feet, giving about 640 cubic feet of capacity. That's a common size for a kitchen remodel or a roofing tear-off paired with a home renovation porta potty. Heavier loads like shingles or concrete fill the weight limit long before the box looks full, so check dumpster weight limits before you load it to the brim. For lighter cleanout jobs, a 10 yard dumpster rental at about 10 by 8 by 3.5 feet, or roughly 300 cubic feet, may be plenty. Either way, plan your porta potty count alongside your dumpster: a renovation crew of 8 to 10 people over several weeks typically needs 1 standard unit and 1 roll-off box on site together. See dumpster sizes and dimensions for the full lineup.
A 30 yard dumpster typically holds 3 to 4 tons, and a 40 yard box usually holds 4 to 5 tons, both depending on what's inside. The 30 yard unit runs about 30 by 8 by 6 feet, close to 1,440 cubic feet. The 40 yard steps up to roughly 40 by 8 by 8 feet, near 2,240 cubic feet, and needs about 60 feet of straight clearance behind the delivery truck to place it. These larger sizes suit full home demolitions or new-construction cleanup, the kind of job that also calls for temporary fence rental around the perimeter and a construction dumpster rental contract rather than a one-off pickup. A crew running a 40 yard box for a multi-week teardown in Sterling Heights should also budget 2 to 3 standard toilets per the OSHA bracket above, plus a handwashing station rental if the scope includes coatings or adhesives, which triggers washing facilities under OSHA 1926.51(f)(1) for paints, coatings, herbicides or insecticides.
Yes. A single day event and a three-day festival do not scale the same way. Once you go past a single day, servicing frequency becomes the real constraint, not raw unit count. A 500-guest festival running Friday through Sunday needs the 8 to 11 units from the table above per day, but also a mid-run service visit rather than one pump-and-leave at setup. Camping events add another wrinkle: overnight guests use facilities at different hours than a day crowd, so a festival restroom rental plan should include night lighting near unit clusters, consistent with the illumination guidance in OSHA 1926.56(a) for work areas. If your event includes a beer garden or wine tent, layer in the 10 to 15 percent bump mentioned earlier. Race organizers planning a marathon and race restrooms setup should cluster units near start and finish lines rather than spreading them along the whole course, since runners concentrate at those two points before and after the event.
Cost scales with unit count and rental length, not just the base per-unit rate. A standard unit runs from about 100 to 150 dollars for a single day, and a weekend rental for the same unit sits in the 125 to 400 dollar range depending on service level. Weekly rentals for a standard unit run 130 to 500 dollars, and monthly rates land between 125 and 325 dollars.
| unit | day | week | month |
|---|---|---|---|
| standard | 100 to 350 | 130 to 500 | 125 to 325 |
| ADA | 200 to 400 | 120 to 240 | not typical |
| deluxe | 85 to 1200 | 150 to 290 | not typical |
Multiply the per-unit rate by your bracket count from the OSHA table or the event chart above, then add a delivery fee, which typically runs 100 to 500 dollars depending on distance and timing. Full pricing breakdowns live on porta potty rental cost and monthly porta potty rental if you're comparing rental lengths for a longer Sterling Heights project.
Plan on 2 units for a 4 hour event and 3 units if it runs a full 8 hours. Add one more if alcohol is served. This assumes a standard unit, not a deluxe trailer, and even spacing across the guest area rather than one cluster.
A 30 yard dumpster typically holds 3 to 4 tons of debris, in a box roughly 30 by 8 by 6 feet. Heavier material like concrete or roofing shingles fills the tonnage limit well before the container looks full, so check weight limits before loading.
A 10 yard dumpster holds about 300 cubic feet, in a box roughly 10 by 8 by 3.5 feet. That size suits a garage cleanout or a small bathroom remodel, not a full demolition.
Yes. OSHA 1926.51(c) sets the ratio: 1 toilet for 20 workers or fewer, 1 seat and 1 urinal per 40 workers between 20 and 200, and 1 per 50 workers above 200. This applies to construction sites specifically, not general offices.
Yes. ADA Standards section 213.2 requires at least 1 accessible unit whenever single-user toilets are clustered, regardless of how small the cluster is. Five percent is the ratio, but one unit is always the floor.
Book as soon as your guest count and date are set, especially for weekend events when demand climbs. Standard units, ADA units and trailers all draw from the same delivery trucks, so early scheduling protects your preferred restroom trailer rental or standard unit choice.
Call now or request a free quote — clean units, on-time delivery, transparent pricing.
