How many porta potties do I need for a construction site?
Start with OSHA 1926.51(c): 1 toilet for 20 or fewer workers, then 1 toilet seat and 1 urinal per 40 workers once you cross 20, and 1 seat plus 1 urinal per 50 workers at 200 or more. A 15 person framing crew in Beaverton needs 1 unit under that table. A 45 person crew crosses into the second bracket and needs 2 seats and a urinal setup, which usually means splitting into two standard porta potty rental units plus a urinal-equipped unit. General contractors managing construction site services in Beaverton often round up rather than hit the ratio exactly, since a broken unit or a slow week shouldn't leave anyone without a working toilet. Check the full bracket table on our OSHA portable toilet requirements page before you finalize a count, and if the crew works with paints, coatings or pesticides, washing facilities are separately required under OSHA 1926.51(f)(1).
How many porta potties do I need for an event?
| guests | event length | units needed |
|---|---|---|
| 50-100 | 4 hours | 2 |
| 100-250 | 4 hours | 3-4 |
| 250-500 | 4 hours | 6-8 |
| 500-1000 | 4 hours | 10-14 |
These ranges assume no alcohol service and a single day. Add 1 unit per 100 guests if alcohol is served, since drink lines mean more trips and shorter dwell time per stall. Multi-day festivals need service scheduled between days, not just more units up front; ANSI/PSAI Z4.3 sets the baseline service interval at once per week for 10 users over a 40 hour stretch, which is far too infrequent for a weekend crowd, so event contracts typically add extra service visits. A wedding for 150 guests in Beaverton with a 5 hour reception and a bar typically lands around 4 to 5 units, split between standard porta potty rental and at least one deluxe flushable porta potty for the bridal party. See wedding restroom rental and event restroom rental for setup details.
What does OSHA actually require on a jobsite?
OSHA 1926.51(c) is the controlling rule for construction sites, and it's a headcount table, not a guess. Under 20 workers, 1 toilet. Between 20 and 199, 1 toilet seat and 1 urinal per 40 workers. At 200 or more, drop to 1 seat and urinal per 50 workers. Separately, OSHA 1926.51(a)(1) requires an adequate supply of potable water at every jobsite, which is why a lot of Beaverton contractors pair toilet delivery with a handwashing station rental even when it's not strictly a paint or pesticide job. If your crew works with coatings, herbicides or insecticides, OSHA 1926.51(f)(1) kicks in and requires washing facilities beyond a hand sanitizer station, since sanitizer alone doesn't meet 29 CFR 1910.141(d)(2), which calls for soap and towels or a hand-drying device. Full breakdown is on the OSHA portable toilet requirements page.
Do I need an ADA-accessible unit?
If you're clustering portable toilets at a public event, yes, at least one has to be accessible. ADA Standards section 213.2 requires at least 5 percent of clustered single-user units be accessible, with a minimum of one unit regardless of cluster size. That means even a 3-unit event setup in Beaverton needs 1 ADA unit. The accessible unit needs a 60 inch turning diameter per ADA Standards section 304.3.1, a clear route at least 36 inches wide per section 403.5.1, and a door opening of at least 32 inches per section 404.2.3. Check our ADA accessible porta potty page for what's inside the unit itself, and ADA restroom requirements for the full standard. Jobsites without public foot traffic have more flexibility, but any site open to spectators, like a golf tournament or county fair, should plan for it from the start.
How long can workers walk to reach a toilet?
There's no fixed distance in the general construction standard, but agricultural field work has a specific rule worth knowing: OSHA 1928.110 requires 1 facility per 20 hand-labor employees, reachable within a quarter mile walk or 5 minutes. Farm operations near Beaverton doing seasonal hand labor should use that ratio, not the general construction table, and our farm and agricultural restrooms page covers placement in more detail. For general construction, common sense fills the gap OSHA leaves: units placed more than a couple hundred feet from the active work zone tend to get used less, which defeats the purpose of hitting the ratio in the first place. Our porta potty placement guide walks through good siting on a active site.
Why do multi-day and alcohol events need more units?
A 4 hour ratio doesn't hold for an 8 hour concert or a 3 day fair. Longer events mean more total visits per unit, and units fill faster than the service schedule assumes. Alcohol compounds this: attendees drink more, use the restroom more often, and lines back up fast once a unit or two goes down for cleaning. A 300 person single-day company picnic in Beaverton might need 6 units under the standard table, but stretch that same event to 8 hours with a beer garden and you're closer to 8 to 10, plus a service visit mid-event rather than waiting until the next morning. Festivals and concerts should also plan for at least one deluxe flushable porta potty or small restroom trailer rental for VIP or staff use. See festival restroom rental and concert restroom rental for setups scaled to bigger crowds.
What's a worked example I can copy?
Take a 60 person construction crew in Beaverton running a 6 month build. Under OSHA 1926.51(c), 60 workers falls in the 20-to-199 bracket, so the math works out to 2 seats and 1 urinal-equipped unit, typically ordered as a monthly porta potty rental since the job runs long. A standard unit rents in the $125 to $325 range for a month depending on service frequency and add-ons. Now take a 400 guest outdoor wedding reception near Cedar Hills, 2.3 miles north of central Beaverton, running 6 hours with a full bar: that lands around 8 to 10 units, mixing standard porta potty rental with 1 ADA unit and 1 or 2 deluxe units for the head table party. Request a firm count through request a quote once you know headcount and hours, since guessing low costs more in emergency delivery than ordering right the first time. If your event runs into deadline trouble, emergency porta potty rental is available, though it costs more than planning ahead through porta potty rental cost estimates.
Beaverton Porta Pros also handles the other end of a jobsite cleanup. Wondering how many feet is a 20 yard dumpster: it runs about 22 feet long. Wondering how many cubic feet in a 20 yard dumpster: figure roughly 540 cubic feet, and wondering how many tons does a 20 yard dumpster hold, plan on 2 to 3 tons of debris before hitting weight limits. Wondering how many cubic feet in a 10 yard dumpster: a 10 yard box runs about 14 feet long and holds around 270 cubic feet. Step up to a 30 yard dumpster and, if you're asking how many tons does a 30 yard dumpster hold, plan on 3 to 4 tons, while for how many tons does a 40 yard dumpster hold, a 40 yard box can take 4 to 5 tons depending on material density. Full breakdowns are on dumpster sizes and dimensions, 30 yard dumpster rental and 40 yard dumpster rental, with pricing on dumpster rental cost.
How many porta potties for 100 people?
Plan on 3 to 4 units for a 4 hour event with 100 to 250 guests, per the event table above. Push past 4 hours or add alcohol service and move toward the higher end. Confirm with request a quote once you lock in your hours.
How many porta potties for a construction crew of 20?
Right at 20 workers, OSHA 1926.51(c) still puts you at 1 toilet facility, the top of the first bracket. Cross to 21 and you move into the next bracket, needing a seat and urinal setup. Most crews near that line order 2 units.
Do I need a separate handwashing station?
Yes, if the standalone toilet doesn't include a handwash unit built in. OSHA 1926.51(a)(1) requires potable water on every jobsite, and 29 CFR 1910.141(d)(2) requires soap and towels or a dryer, not just sanitizer. See handwashing station rental.
How far can Beaverton Porta Pros deliver?
Beaverton Porta Pros services Beaverton and nearby communities including Cedar Hills at 2.3 miles north, West Slope at 3.0 miles northeast, and Marlene Village at 3.6 miles north. Check service areas for the full list.
Can I rent just one porta potty for a small backyard project?
Yes. A single standard porta potty rental works fine for small crews or short home projects. See home renovation porta potty for typical setups and porta potty rental per day for short-term pricing.
What if my headcount changes after I book?
Call before the event, not after. Beaverton Porta Pros can usually add units with notice, though last-minute additions may fall under emergency porta potty rental pricing rather than standard rates. Confirm changes early through contact.
Next step
Get a delivery date
Tell us the address, the dates and the headcount. We size the order and confirm the route.