Backyard wedding with 120 guests: How many porta potties for a 6-hour party?

For a six-hour backyard wedding with 120 guests and an open bar, you should rent at least four portable toilets. The industry units per person guideline starts at about one unit per 50 to 75 people for a four-hour event. Your longer duration and alcohol service mean you need more units to prevent lines, four units puts you well ahead of the baseline and accounts for the extra restroom use that comes with drinking. If your crowd is mostly women, consider adding a fifth unit.

A restroom trailer is a significant upgrade that many couples choose for weddings. It provides flushing toilets, sinks with running water, and a more comfortable experience. The trade-off is that it requires level ground, electrical hookup or a generator, and typically costs more than a cluster of standard units. Your yard’s truck access is perfect for either option.

Your rental company will likely schedule one service visit after the event since it’s a single day. With standard units, confirm they use a formaldehyde-free deodorizer to avoid issues at the treatment plant. Whichever you choose, placing the facilities on firm, level ground near the party but slightly apart will keep guests comfortable.