How many ADA units does a North Charleston job site need?
Start with the cluster rule. ADA Standards 213.2 says at least 5 percent of a grouped set of portable toilets must be accessible, and never fewer than one, no matter how small the group is. So a job with three standard units still needs one accessible unit standing next to them, not off in a corner. This runs alongside the general worker-count math in OSHA 1926.51(c), which sets one toilet for every 20 workers on a construction crew, stepping up to one toilet and one urinal per 40 once you pass twenty employees. Figuring both ratios together is where most North Charleston contractors get tripped up, and it is exactly what our porta potty placement guide walks through. If you are still sizing the job, run the numbers through how many porta potties do I need before you call for a quote, since ADA and headcount ratios do not always land you on the same number.
What makes a portable unit ADA accessible?
Space and reach, mostly. ADA Standards 304.3.1 calls for a 60 inch turning circle inside the unit, and ADA Standards 404.2.3 sets a 32 inch minimum clear door opening, both wider and roomier than a standard 44 by 48 inch unit. Grab bars, a lowered paper holder and a larger footprint come standard on the accessible model we bring to North Charleston sites. Reach range matters too: ADA Standards 308.2.1 limits unobstructed forward reach to 48 inches high and 15 inches low, which is why fixtures inside sit lower than you would expect. Door hardware has to work with a closed fist, per ADA Standards 309.4, capped at 5 pounds of force, no twisting or pinching required. None of this is optional trim. It is the difference between a unit that passes inspection on a North Charleston event site and one that gets flagged. See the full breakdown on our ADA accessible porta potty page.
Where should ADA units be placed on site?
Route width and ground surface come first. ADA Standards 403.5.1 requires a 36 inch clear path leading to the unit, and ADA Standards 302.1 requires that path be stable, firm and slip resistant, which rules out loose gravel or soft turf as the only approach. If the ground slopes at all, ADA Standards 405.2 caps ramp grade at 1:12. On a North Charleston construction site that means planning the accessible unit's spot before delivery day, not after the crew has already parked equipment in front of it. A roll-off delivery alone needs about 60 feet of straight clearance behind the truck, so if you are staging a roll-off dumpster rental on the same lot, coordinate the layout so neither delivery blocks the other. Our porta potty placement guide covers surface prep in more depth, and it is worth reading before delivery week on any construction site services job in North Charleston.
Do event sites in North Charleston have different ADA rules?
Events follow the same cluster ratio as construction, but the stakes are different because the public shows up on a schedule. Whether you are running event restroom rental, a festival restroom rental, or restrooms for a marathon and race route through North Charleston, ADA Standards 213.2 still applies to every cluster of units you set up along the course or in the venue footprint. A wedding restroom rental with a single restroom trailer needs one accessible stall built in, which is standard on our 2 stall restroom trailer and larger 4 stall restroom trailer units. Golf events and fairs spread units across a bigger footprint, so golf tournament restrooms and county fair restrooms setups usually need accessible units at each cluster point, not just one for the whole grounds. Pricing on an accessible unit runs 200 to 400 dollars a day depending on placement and duration, and this table shows how the day, week and weekend rates compare.
| duration | low | typical | high |
|---|---|---|---|
| day | $200 | $230 | $400 |
| week | $120 | $185 | $240 |
| weekend | $199 | $240 | $300 |
Note the weekend rate sits between day and week because it is a flat short event rate, not a per-day multiple. For a longer build-out, our monthly porta potty rental page has the full cost picture, and general pricing questions are answered on porta potty rental cost.
Does an ADA unit cost more than a standard porta potty?
Yes. A standard unit runs 100 to 350 dollars a day, while an ADA unit runs 200 to 400 dollars a day because of the larger footprint and added hardware. Weekly rates follow the same pattern. See standard porta potty rental for the baseline comparison.
How many accessible units do I need for a 20-unit cluster?
At minimum one, per ADA Standards 213.2, since 5 percent of 20 rounds to one. Push past that count and you add a second accessible unit. Confirm your total against OSHA 1926.51(c) worker ratios first.
Can I rent just one ADA unit for a small North Charleston job?
Yes. Even a cluster of two or three standard units triggers the "never fewer than one" rule under ADA Standards 213.2. One accessible unit satisfies a small site.
Do restroom trailers need ADA stalls too?
Yes, when offered to the public or a mixed crew. Our 8 stall restroom trailer and luxury restroom trailer options include ADA-compliant stalls built to the same reach and clearance standards.
Is placement near the entrance required?
The standard requires a stable 36 inch clear route per ADA Standards 403.5.1, not a specific distance from the entrance. Shortest firm-surface path wins on most North Charleston sites.
Next step
Get a delivery date
Tell us the address, the dates and the headcount. We size the order and confirm the route.