How many units do I need?
Start with headcount and duration, not guesswork. OSHA 1926.51(c) sets the baseline for construction crews: 1 toilet for 20 workers or fewer, then 1 toilet and 1 urinal per 40 workers once you pass 20, dropping to 1 per 50 once you hit 200 or more. Farm crews fall under a different rule; farm and agricultural restrooms need to check OSHA 1928.110, which calls for one facility per 20 hand-labor employees within a quarter mile walk. Events run on a different math entirely, driven by hours and drink service rather than headcount alone, so use the porta potty placement guide alongside our how many porta potties do I need breakdown before you lock a number. If you're renting for a wedding, the wedding restroom rental page walks through guest-count math separately. Once you have a count, decide on unit type: standard porta potty rental covers most job sites, while a deluxe flushable porta potty fits events where guests expect more. Either way, check the ADA accessible porta potty requirement next, because headcount alone doesn't clear that box.
Do I need an ADA unit?
Yes, if you're clustering multiple standard units. ADA Standards 213.2 requires at least 5 percent of clustered single-user units to be accessible, and never fewer than one, even if your math rounds down to zero. That accessible unit also needs a 60 inch turning circle inside per ADA 304.3.1, a 32 inch clear door opening per ADA 404.2.3, and a stable, slip-resistant approach per ADA 302.1. Check the full rundown on our ADA restroom requirements page before you finalize your order, especially for events in Ann Arbor with mixed foot traffic like fairs or races. A marathon and race restrooms setup, for example, usually needs accessible units spaced along the route, not clustered at one tent. Skipping this step is the single most common reason event permits get kicked back for revision.
Where should units be placed on site?
Placement in Ann Arbor's public right of way needs confirming with the city before delivery day, since that rule varies by location and use case, and we have not verified a specific ordinance to cite here. What we can confirm: a standard unit measures roughly 44 by 48 inches on the ground and stands about 92 inches tall, so give it a level, stable spot per ADA 302.1 even if the unit itself isn't the ADA one. Keep a 36 inch clear path to the door per ADA Standards 403.5.1, and don't block that path with cords, hoses, or stacked material. If you're pairing a temporary fence rental with your units to secure a perimeter, plan the fence line first, then place restrooms inside it, not the other way around. Sites running a roll-off dumpster rental alongside restrooms need to keep both clear of that 60 foot straight clearance a delivery truck needs behind it. And if lighting matters after dark, check OSHA 1926.56(a) for minimum illumination at the unit location before you finalize your layout, or pair it with a light tower rental.
When should service be scheduled?
Weekly, at minimum, for standard use. ANSI/PSAI Z4.3 sets the baseline service interval at once per week for up to 10 users across a 40 hour week, so a busy job site or a multi-day festival needs more frequent pumps, not less. Water and handwashing matter here too: OSHA 1926.51(a)(1) requires an adequate supply of potable water at every workplace, and 29 CFR 1910.141(d)(2) requires soap and towels or a hand-drying device at any washing station, meaning hand sanitizer alone doesn't satisfy that rule. If your crew is spraying paint, coatings, herbicides, or insecticides, OSHA 1926.51(f)(1) kicks in separately and requires washing facilities for that contaminant exposure specifically. Pair your restroom order with a handwashing station rental or a portable sink rental to cover that requirement cleanly. Renters ask about how often are porta potties cleaned more than almost anything else, and the honest answer is that it depends on your contract terms, not a fixed number we can promise here.
Rental duration and pricing snapshot
| Unit | Day | Week | Month |
|---|---|---|---|
| Standard | $100-350 | $130-500 | $125-325 |
| ADA | $200-400 | $240-500 | -- |
| Deluxe | $85-1200 | $150-290 | -- |
Weekend rates run separately from these, with standard units typically landing around $250 for a weekend block. Compare full pricing context on porta potty rental cost, or check the monthly porta potty rental page if your Ann Arbor project runs long. Renters near Ypsilanti, about 6.4 miles east, or Scio, roughly 6.6 miles west, use the same pricing bands since delivery stays within the same general radius; check porta potty rental per day for short jobs instead.
What size unit fits on my site?
A standard unit is about 44 by 48 inches on the ground and 92 inches tall, small enough for most driveways and job site corners. Deluxe units run similar footprints with upgraded interiors. Confirm ground clearance and level ground before delivery day.
Do I need a permit for placement in Ann Arbor?
Placement in the public right of way needs confirming with the city; we haven't verified a specific Ann Arbor ordinance to cite. Check the porta potty permit requirements page, or call the city directly before delivery.
How far in advance should I book?
Book as early as your date allows, especially for weekend events, since trailer and deluxe units have tighter availability than standard units. Emergency needs are still covered through emergency porta potty rental if your timeline is already tight.
Can I rent a handwashing station separately from restrooms?
Yes. Many Ann Arbor job sites order handwashing station rental or hand sanitizer station rental units alongside restrooms to satisfy 29 CFR 1910.141(d)(2) separately from toilet counts.
What if my event needs more than porta potties?
Most sites end up combining services. Check construction site services or event restroom rental for bundling restrooms with fencing, dumpsters, and storage on one delivery schedule.
Next step
Get a delivery date
Tell us the address, the dates and the headcount. We size the order and confirm the route.