ADA porta potty requirements: how many, what size, and when they are required

Short answer

The accessibility rule for portable toilets is a percentage, not a fixed count. Whether you call the unit a handicap porta potty, a wheelchair accessible portable toilet or an ADA portable restroom, the same three facts decide what you need.

The percentage applies per cluster. Four porta potties at the main stage and two at the parking lot are two clusters and need two ADA units, not one.

How many ADA porta potties do you need?

Count the units in each cluster, take 5%, round up, and never go below 1. That is the whole calculation, and it comes from the 2010 ADA Standards §213.2 Exception 3, which California copies into Building Code section 11B-213 with the same effect: 5 percent, but no fewer than one, of the toilet units at each cluster must be accessible.

Two practical notes from our event work:

• Round up from the real count. 21 units need 2 accessible ones, not 1.05. Inspectors count units, not percentages.
• Separate clusters, separate ADA units. A cluster is a group of units that a person reaches as one destination. Our event sizing on the events page places an accessible unit in every cluster by default, and the porta potty calculator adds 5% automatically.

For a wedding of 150 guests with 3 standard units, that means 1 ADA unit. Our wedding sizing guide treats the accessible unit as the default third or fourth unit because at least one guest with a walker, a wheelchair or a stroller is a near certainty.

What makes a porta potty ADA compliant?

A compliant unit is built so a wheelchair user can enter, turn, transfer and leave without help. The 2010 Standards set the dimensions in sections 603 and 604; California repeats them in 11B-603 and 11B-604.

Three things that are not required but often assumed: a flush, a sink and a ramp. An ADA porta potty is a non-flushing portable toilet with ground-level entry, so no ramp is needed. If you want an accessible flushing restroom with a real sink, the answer is a trailer with an accessible suite, covered below. Full specs for our unit are on the ADA porta potty product page.

Do construction sites need an ADA portable toilet?

Not for worker-only use. Section 203.2 of the 2010 ADA Standards exempts portable toilet units provided for use exclusively by construction personnel on a construction site, and the California Building Code carries the same exemption, so a crew of 40 can run 3 standard units and 2 handwash stations with no accessible unit. The rule that governs construction toilets is instead Cal/OSHA 8 CCR §1526, 1 toilet per 20 workers per sex, explained in our Cal/OSHA construction toilet guide and the construction site toilet requirements guide.

The exemption is lost the moment anyone other than construction personnel uses the cluster. Common cases where we add an accessible unit on a job site:

• Occupied renovations: a hospital wing, a school over summer break with staff on campus, a retail center under remodel while stores trade.
• Sales trailers and model homes: buyers on a subdivision tour are the public.
• Public agency sites with inspection tours: a city government contract usually specifies an accessible unit in the RFQ regardless of the exemption.
• Film base camps on a street or in a park: cast and crew are workers, but a public holding area is not. The film page covers the split layout.

When in doubt we price both options. On a 28-day cycle the difference is $269 for the ADA unit against $189 for a standard restroom, and the ADA unit counts as one toilet toward the §1526 ratio.

What is the difference between ADA, handicap accessible and Title 24?

They describe the same unit; the words come from different sources. "Handicap porta potty" is the older customer term, "wheelchair accessible porta potty" describes the user, and "ADA porta potty" names the federal standard. California adds a fourth label.

• ADA (federal): the 2010 Standards for Accessible Design enforced by the Department of Justice under Titles II (government) and III (public accommodations). Applies to any event or site open to the public.
• Title 24 / CBC Chapter 11B (California): the state's accessibility code, enforced by the local building official. It adopts the 5% cluster rule in 11B-213 and is stricter than the federal standard on several dimensions, which is why we label our unit "ADA / Title 24" rather than ADA alone. The current chapter is published by the California Building Standards Commission.
• "Handicap accessible" or "family unit" on a rental quote: ask for the dimensions. If the unit is under 60 inches inside, it is an oversized standard unit, not an accessible one, and it will not satisfy an event permit reviewer.

A cheap test for any vendor quote: the accessible unit should be at least 78 inches wide. Ours is listed on the pricing page at $269 per month and $325 per event with the dimensions printed next to the price.

Is an ADA restroom trailer required at weddings and upscale events?

No regulation requires a trailer, but the 5% rule still applies when guests use a cluster, and a luxury trailer with three steps up does not count toward it. Planners solve this one of two ways.

The ADA+2 is the only option in which a wheelchair user gets the same flushing, air-conditioned restroom as everyone else. For many couples that matters more than the $675 difference. Compare all trailer sizes on the restroom trailers page.

Whichever you choose, the accessible unit or ramp needs a firm, stable route at least 36 inches wide from the accessible parking or the main gathering area, with a running slope no steeper than 1:20. A lawn is fine when dry; plywood or mats fix it when it is not.

Bay Area specifics

Prices below are all-in within 25 miles of our Hayward yard: delivery, pickup, full stock, sales tax, and weekly service on 28-day rentals. Beyond 25 miles we add $3.50 per mile each way.

Delivery is included to Oakland, Fremont, Palo Alto and every city within 25 miles. San Francisco and San Jose are 30 and 28 miles out, which adds about $18 and $11 respectively.

Permits. An accessible unit on private property needs no permit. On a sidewalk or parking lane it needs the city's right-of-way permit like any other unit, with one extra constraint: it is 92 inches deep. San Francisco's Street Space permit requires a 4-foot minimum clear pedestrian path and limits you to half the sidewalk width, which rules out most sidewalk placements for an ADA unit and makes the parking lane the realistic choice. Oakland requires an obstruction permit with 5 feet 6 inches of sidewalk kept clear. Details and fees are in our SF Street Space guide.

County event permits. Alameda, Santa Clara and San Mateo county environmental health departments ask for a sanitation plan on events with food service; list the accessible unit count per cluster and the path surface on that plan.

Service. On 28-day rentals we service the unit weekly: pump the 70-gallon tank, disinfect seat, grab bars and door hardware, restock, check that the lever hardware and lock still work one-handed, and re-shim the pad if the floor has settled. Every visit is photographed, GPS-stamped and texted to you. Waste goes only to permitted facilities such as EBMUD in Oakland.

What to do next

1. Count the units in each cluster, take 5%, round up, minimum 1.
2. Check whether the public, staff or occupants will use the cluster. If yes, you need the accessible unit even on a construction site.
3. Pick a firm, level spot with a 36-inch path and room for a truck to roll the unit off.
4. Book online or call. Next-day delivery is available for orders placed by 2 PM.

Get your all-in ADA porta potty price in 30 seconds: Instant price · or call (650) 977-2883. We answer in English, Spanish and Chinese.