What is the quick answer for a wedding?
A 150-guest, 5-hour wedding with a bar needs 5 standard units: 4 for the guests and hours, plus 1 for alcohol. One of the 5 should be wheelchair-accessible. A two-stall restroom trailer can replace about 3–4 standard units, so many couples book 1 trailer plus 1–2 portable units.
How do I calculate it myself?
Calculate wedding restrooms in four steps. Divide guests by 50 for up to 4 hours, by 40 for up to 6 hours, or by 30 for up to 8 hours, and round up. Add 1 unit per 4 if there is a bar. Make 5% accessible, at least 1. Add 1 handwash station per 4 units if food is served.
| Guests | Hours | Base | + Bar | Total | Accessible |
|---|---|---|---|---|---|
| 75 | 5 | 2 | 1 | 3 | 1 |
| 100 | 5 | 3 | 1 | 4 | 1 |
| 150 | 5 | 4 | 1 | 5 | 1 |
| 200 | 6 | 5 | 2 | 7 | 1 |
Or use the calculator.
Trailer or porta potties for a wedding?
Choose a restroom trailer for evening receptions, summer heat or a dress code; it has air conditioning, lights and running water. Choose deluxe flushing porta potties when the site has no hose or outlet or no level truck access. A wheelchair-accessible unit should sit next to a trailer, because trailers usually have steps.
Where should wedding restrooms go?
Place wedding restrooms on level, lit ground about 50–100 feet from dinner tables and downwind if possible, with a clear path guests can walk in dress shoes. The truck needs access the day before. Turn doors away from the ceremony site and photo areas.
Related questions
How many restrooms do I need for a 150-guest wedding?
A 150-guest, 5-hour wedding with a bar needs 5 standard units in our sizing table: 4 for the guest count and length, plus 1 because alcohol is served. One should be wheelchair-accessible. A two-stall restroom trailer can replace 3–4 standard units for most weddings.
Is one restroom trailer enough for 80 guests?
Yes. One two-stall restroom trailer serves about 80 guests for a 4–5 hour event. Add a wheelchair-accessible portable unit if any guest may need one, because many trailers have steps. Bigger crowds or longer events need a larger trailer or added units.
What does a restroom trailer need on site?
A restroom trailer needs a standard 120-volt, 20-amp outdoor outlet within about 100 feet and a garden hose spigot within about 100 feet. It needs level ground the truck can back onto. Without water or power, ask about a fresh-water tank and generator add-on.
Do I need a handicap porta potty at my event?
Where accessible restrooms are required, the 2010 ADA Standards section 213.2 calls for at least 5% of portable units in each cluster, and no fewer than one, to be accessible. Dennis Rental Works recommends at least 1 accessible unit for any event of 100 or more guests.
How far ahead should I book a porta potty?
Book a jobsite unit 1–2 business days ahead. Book a weekend event 1–2 weeks ahead. Book spring and fall Saturdays and holiday weekends 2–4 weeks ahead. Book restroom trailers for weddings 4–8 weeks ahead, because trailer supply runs out first.
