Porta Potty Dimensions
Sizes vary a little by model. These are the manufacturer's published specifications for three widely rented PolyJohn units: a standard unit, a roomier unit available with a flush, and a wheelchair-accessible unit.
Outside dimensions and weight
| Unit | Height | Width | Depth | Empty weight | Holding tank |
|---|---|---|---|---|---|
| PolyJohn PJN3 (standard) | 91 in (231 cm) | 43.5 in (110 cm) | 47 in (119 cm) | 165 lb | 60 gal |
| PolyJohn Fleet (standard or flush) | 91 in (231 cm) | 47 in (119 cm) | 48 in (122 cm) | 195 lb (243 lb flush model) | 60 gal |
| PolyJohn Comfort XL (wheelchair accessible) | 91 in (231 cm) | 62 in (157 cm) | 62 in (157 cm) | 240 lb | 33 gal |
Source: PolyJohn product specification pages, checked 15 November 2026.
Inside dimensions
- PJN3: 82 in high, 41 in wide and 41 in deep inside; seat height 19 in.
- Fleet: 83 in high, 45.5 in wide and 43 in deep inside; seat height 19.5 in.
- Comfort XL: door frame opening 74 in high by 32 in wide; seat height 19 in.
Planning the space
- Level, firm ground. Units are tall and narrow, and an empty standard unit weighs about as much as an adult. Set them on level ground away from slopes, and stake or tie them down in windy places.
- Door swing. Doors open outward, so leave clear space in front, and face doors away from roads and toward guests.
- Truck access. Service trucks pump through a hose. Ask your provider how close the truck must park, and keep that route clear of guests, cars and soft ground.
- Accessible units. An accessible unit only helps if people can reach it. Put it on a firm, level route, not on gravel or grass that a wheelchair can't cross. The interior turning space rules are in §603 of the 2010 ADA Standards.
See what each size costs: standard units, flushable units, ADA units and luxury units and trailers. Job sites: read the OSHA toilet requirements.
Frequently asked questions
How big is a standard porta potty?
A typical standard unit, the PolyJohn PJN3, is 91 inches tall, 43.5 inches wide and 47 inches deep on the outside (about 7.6 × 3.6 × 3.9 feet), and weighs 165 pounds empty, according to the manufacturer.
How big is an ADA porta potty?
Much bigger. The PolyJohn Comfort XL wheelchair-accessible unit is 62 by 62 inches at the base and 91 inches tall, with a 32-inch-wide door opening, and weighs 240 pounds empty. Allow a firm, level pad of at least that size plus room to approach the door.
How much space do I need for a porta potty?
For a standard unit, plan on a level area of at least about 4 by 4 feet, plus room for the door to swing open and a path for the service truck. Providers generally want the truck within a short hose run of the unit, so ask yours how close it needs to park.