Last updated
How many units do you actually need?
Start with headcount, not guesswork. OSHA 1926.51(c) sets the construction ratio at 1 toilet for 20 workers or fewer, then 1 toilet seat and 1 urinal per 40 workers once you cross 20, and per 50 once you hit 200 or more. For events, ANSI/PSAI Z4.3 uses one unit per 10 users across a 40 hour week as the baseline service interval, which is a cleaning schedule more than a headcount rule, so pair it with your own guest count. If you are not sure which side of the line your job falls on, our guide on how many porta potties you need walks through both. Chattanooga job sites and Chattanooga weekend festivals need different math, and getting it wrong means a call to us mid-event asking for another unit fast. A standard unit runs 44 by 48 inches on the ground and about 92 inches tall, so sketch your footprint before delivery day, not after the truck shows up.
What type of unit fits the job?
Match the unit to the work, not the budget alone. A standard porta potty covers most construction and yard work. A deluxe flushable unit suits weddings and higher-traffic events where guests notice the difference. ADA Standards section 213.2 requires at least 5 percent of a cluster of single-user units to be accessible, and never fewer than one, so if you are ordering four or more standard units, add an ADA unit to the order. For multi-day builds or larger crews, a restroom trailer with 2, 4, or 8 stalls beats a row of single units on cleaning time. Compare basic sizing against a 2 stall trailer or an 8 stall trailer before you commit, since trailer rates scale differently than single-unit rates:
| unit | day | week | month |
|---|---|---|---|
| standard | $100-$350 | $130-$500 | $125-$325 |
| ada | $200-$400 | $200-$240 | n/a |
| deluxe | $85-$1200 | $150-$290 | n/a |
Weekend rates run separately from these; a standard unit weekend rental typically lands around $250. Check the porta potty rental cost breakdown or the per-day pricing page for more detail on where your job fits.
Where should the unit go on site?
Pick flat, stable ground with a clear path for the service truck. ADA Standards section 302.1 calls for stable, firm, slip-resistant surfacing, which rules out soft mud or loose gravel for an accessible unit. A roll-off or restroom trailer delivery needs about 60 feet of straight clearance behind the truck, so measure your driveway or lot access before delivery morning, especially on tighter Chattanooga lots near East Ridge, 6.6 miles south, or Red Bank, 9.3 miles northwest, where older streets and narrow drives are common. Keep units away from soft slopes and drainage paths. If you are placing near a public sidewalk or right of way, that placement needs confirming with the city; we do not guess at right-of-way rules here. Our placement guide covers clearance, ground stability, and access angles in more depth, and the permit requirements page covers what to check with Chattanooga before delivery day.
Add a handwashing station or portable sink next to every cluster. 29 CFR 1910.141(d)(2) requires washing facilities stocked with soap and towels or a hand-drying device, not sanitizer alone. If your crew is spraying paint, coatings, herbicides, or insecticides, OSHA 1926.51(f)(1) specifically requires washing facilities for that work, separate from general sanitation. Farm crews doing hand labor fall under a different rule: OSHA 1928.110 calls for one facility per 20 workers within a quarter mile walk. If you are running an agricultural operation, see farm and agricultural restrooms for how that plays out on site.
When should you book and schedule service?
Book 10 to 14 days ahead for standard construction jobs, and earlier for weekend events since trailer and deluxe inventory moves fast. Confirm your service interval up front: ANSI/PSAI Z4.3 sets one visit per week as the baseline for up to 10 users over a 40 hour week, but busy sites often need twice-weekly service, so ask us to schedule accordingly rather than assuming the default covers you. For events near Chattanooga, factor drive time into your delivery window; towns like Collegedale, 13.6 miles east, and Signal Mountain, 14.1 miles northwest, add real minutes to a delivery run compared to a job inside city limits. If you are also renting a temporary fence, light tower, or storage container for the same job, coordinate delivery day for all of it at once. Save a call by checking our rental checklist for events style guides if you are planning a festival, marathon, or golf tournament rather than a jobsite.
How many porta potties do I need for 100 guests?
For 100 guests at a single-day event, plan on 4 to 6 standard units, or 2 to 3 if you add a deluxe or ADA unit to the mix. Longer events or events serving alcohol push that number up. See how many porta potties do I need for the full breakdown by headcount and event length.
Do I need an ADA unit for a small job site?
Yes, if you are ordering a cluster of units. ADA Standards section 213.2 requires at least one accessible unit whenever units are grouped, even for a small cluster of 4 or 5. A single standalone unit on a small residential job does not trigger the same requirement.
Can I place a porta potty on the street or sidewalk?
That depends on Chattanooga's right-of-way rules, which need confirming directly with the city before delivery. We have not verified a blanket rule either way, so check with Chattanooga's permitting office and let us know what you find so we can plan the drop.
How much clearance does the delivery truck need?
Plan on about 60 feet of straight clearance behind the truck for roll-off and trailer deliveries. Standard unit drop-offs need less room, but a tight driveway or alley access should still be measured and confirmed before delivery day.
What is the difference between a standard and deluxe unit checklist-wise?
A standard unit covers basic job site needs with a 60 to 70 gallon tank and no flush feature. A deluxe flushable unit adds flushing and a nicer interior for weddings or client-facing events, priced higher per day but often booked weekly for multi-day events instead.
Next step
Get a delivery date
Tell us the address, the dates and the headcount. We size the order and confirm the route.