How Much Does a 4 Stall Restroom Trailer Cost in San Mateo?
Pricing swings hard on finish level and rental length, which is why the trailer category in our data spans 175 dollars on the low day rate up to 2,500 for a fully finished unit. Weekly rentals typically land between 150 and 1,650 dollars, and full weekend bookings for events run from 900 up to 3,000. Multi-day festivals often book the event restroom rental rate instead, which sits between 2,499 and 3,899 for the event package. If you are comparing against a basic unit, start with restroom trailer rental cost before you lock in a size.
| duration | low | typical | high |
|---|---|---|---|
| day | 175 | 800 | 2500 |
| week | 150 | 1397 | 1650 |
| weekend | 900 | 2000 | 3000 |
| event | 2499 | 3500 | 3899 |
A 4 stall sits between the compact 2 stall restroom trailer and the larger 8 stall restroom trailer, and most San Mateo clients pick 4 stalls once guest counts pass roughly 75 to 100 people. If you just need one unit for a small crew, a standard porta potty rental or a deluxe flushable porta potty costs less and delivers faster.
What Fits Inside a 4 Stall Restroom Trailer?
Four private stalls, running water, and interior lighting are standard, and most units carry a fresh water tank plus a separate holding tank sized for the guest count you book. San Mateo caterers and planners often pair the trailer with a portable sink rental near the food line, since OSHA 1926.51(a)(1) calls for an adequate supply of potable water at any staffed jobsite or event footprint. If the event includes an ADA guest list, ADA Standards section 213.2 requires that at least 5 percent of clustered restroom units be accessible, and never fewer than one, so ask about pairing an ADA accessible porta potty alongside the trailer rather than assuming the trailer itself clears that bar. Ramp slope on any accessible approach should not exceed 1:12 per ADA Standards section 405.2, and the clear route into the unit needs a minimum 36 inch width under ADA Standards section 403.5.1.
Placement matters more than people expect. A roll-off delivery needs about 60 feet of straight clearance behind the truck, and restroom trailers need similar clearance to back in level. Check the porta potty placement guide before delivery day, and if the site sits on a public street in San Mateo, right-of-way placement needs confirming directly with the city, since permit rules were not verified for this page.
Where Are 4 Stall Restroom Trailers Delivered in San Mateo?
We deliver anywhere in San Mateo and to the towns around it, including Foster City 4.7 miles east, Burlingame 5.0 miles northwest, and Belmont 5.3 miles south. Weddings held near the Bay in San Mateo frequently request the trailer over standard units for the running water and interior finish. If your event sits closer to San Bruno, 10.2 miles northwest, or Daly City at 15.0 miles, delivery is still routine; check service areas for the full coverage map. Construction crews running longer jobs sometimes pair a trailer with a temporary fence rental or a roll-off dumpster rental to keep the site contained, and construction site services covers that full setup.
Handwashing after paint, coatings, herbicide, or insecticide work falls under OSHA 1926.51(f)(1), separate from the general sanitation rule in 1926.51(c), so a jobsite with those materials on hand should add a handwashing station rental even if the trailer is already on site.
How many stalls do I actually need for my guest count?
Four stalls generally cover 75 to 100 guests over a few hours; larger counts push toward the 8 stall restroom trailer. Use how many porta potties do I need to check ratios against your specific headcount and event length before booking.
Does a 4 stall trailer need a special hookup?
Most units run self-contained with onboard water and holding tanks, so no sewer hookup is required. Power needs vary; ask about lighting and climate control load when you request a quote.
Can I rent a 4 stall trailer for a construction site instead of an event?
Yes, though many crews choose a portable restroom rental or porta john rental for cost reasons. OSHA 1926.51(c)(1) sets toilet counts by crew size, and the trailer can still satisfy that if it is serviced on schedule.
How often is the trailer serviced during a multi-day rental?
ANSI/PSAI Z4.3 sets a baseline of one service visit per week for up to 10 users over a 40 hour week; higher guest counts or longer hours need more frequent visits. Ask your San Mateo route driver to confirm the schedule at booking.
What is the difference between renting daily versus for the full weekend?
Daily rates in our data start at 175 dollars, while full weekend event bookings run from 900 to 3,000 depending on finish. Compare against a porta potty rental per day if a trailer is more than the event needs.
Next step
Get a delivery date
Tell us the address, the dates and the headcount. We size the order and confirm the route.