How many porta potties do I need?
Start with headcount, not guesswork. OSHA 1926.51(c) sets the construction standard: 1 toilet for 20 workers or fewer, then 1 toilet and 1 urinal per 40 workers once you pass 20. At 200 or more workers it drops to one seat and one urinal per 50. If you run an agricultural crew instead, OSHA 1928.110 asks for one facility per 20 hand-labor employees, and it has to sit within a quarter mile walk. For events, skip the OSHA math and use a headcount guide instead. The full breakdown, with a duration multiplier for all-day festivals versus a four-hour ceremony, lives on how many porta potties do I need. Renting one unit short of that count is the single most common mistake we see in Baltimore, and it always shows up around hour three of the event, not at setup.
What size unit fits my site?
A standard unit runs about 44 by 48 inches on the ground and stands roughly 92 inches tall, so measure your placement spot before delivery day, not after the truck arrives. The tank underneath holds 60 to 70 gallons, which is why ANSI/PSAI Z4.3 sets one service visit a week as the baseline for up to 10 users over a 40 hour week. If your crew or guest count is higher, you will need more frequent pumping or more units, not a bigger tank. Compare the standard porta potty rental against the deluxe flushable porta potty if guests expect something closer to a real bathroom, and check the ADA accessible porta potty for job sites or public events that need one. ADA Standards 213.2 requires at least 5 percent of a cluster to be accessible, never fewer than one unit, so a wedding or fair with six standard units still needs an accessible one on site.
Where should the unit go?
Pick flat, stable ground with a clear path in and out. ADA Standards 302.1 calls for surfaces that are stable, firm and slip resistant, and 403.5.1 sets a 36 inch minimum clear width on the route leading to the unit. If you are also renting a roll-off, remember it needs about 60 feet of straight clearance behind the delivery truck, so plan both drop points before the trucks show up on the same morning. Placement in the public right of way in Baltimore needs confirming with the city directly; we do not guess at that rule, and neither should you. Our full walkthrough on porta potty placement guide covers driveway slope, overhead wires, and how far from a building entrance is too close. If you are unsure whether your spot needs a permit at all, read porta potty permit requirements before delivery week, not the day of.
What does it cost and how long should I rent?
Match the rental term to the job, not the other way around. A single-day event rental runs cheaper per day than a week, and a monthly job site rental spreads the cost lower still per day than either. Here is how the standard unit breaks down:
| duration | typical price |
|---|---|
| day | $150 |
| week | $200 |
| month | $200 |
Weekend rates for a standard unit run higher than a single weekday, generally landing between $125 and $400 depending on the market and add-ons, so a Saturday wedding costs more than a Tuesday punch-list job even at the same headcount. Delivery fees run separately, and they scale with distance and rush timing, covered in full on porta potty rental cost. If your job runs by the day specifically, porta potty rental per day breaks down what changes at that shorter term. Construction crews on multi-month builds should look at monthly porta potty rental instead, since the per-day cost drops the longer the unit stays on site. Handwashing is a separate line item too. OSHA 1926.51(f)(1) requires washing facilities specifically where crews apply paints, coatings, herbicides or insecticides, and 29 CFR 1910.141(d)(2) requires soap and towels at any handwashing setup, not sanitizer alone. Add a handwashing station rental if your Baltimore job touches any of those materials.
Beyond the toilets themselves, most job sites in Baltimore end up needing a matched set of services delivered together: a roll-off dumpster rental for debris, a temporary fence rental around the perimeter, and sometimes a storage container rental for tools and materials. Renovation jobs in older Baltimore rowhomes tend to need all three at once, which is why we quote them together on construction site services. Weddings and outdoor events lean toward a restroom trailer rental instead of standard units, especially for guest counts over 100, and our event restroom rental page walks through when a trailer beats a standard unit on cost per guest.
How far in advance should I book in Baltimore?
Book 7 to 10 business days out for a standard job, longer for weekend weddings or festivals when trucks are already routed toward Towson, 8.0 miles north, or Dundalk, 8.1 miles east. Same-day requests are possible but limited; see emergency porta potty rental if you are already past the deadline.
Do I need a permit for a porta potty in Baltimore?
Sometimes, depending on where the unit sits. Placement on private property usually does not need one; placement in a public right of way needs confirming with the city. Check porta potty permit requirements before delivery day so it is not a surprise.
How often does the unit get serviced?
Once weekly is the baseline for up to 10 users under ANSI/PSAI Z4.3, but heavy-use events and job sites need more frequent visits. See how often are porta potties cleaned for what changes the interval.
Can I rent just one unit for a small backyard project?
Yes. A single standard unit works fine for a small crew or a small gathering; check home renovation porta potty for typical single-unit renovation setups around Baltimore.
What is the difference between a porta potty and a restroom trailer?
A standard unit is self-contained with a holding tank; a trailer has plumbed fixtures and often flushes. Trailers cost more but suit weddings and multi-day events better. Compare options on restroom trailer rental cost.
Next step
Get a delivery date
Tell us the address, the dates and the headcount. We size the order and confirm the route.