Cornwall rent a porta potty comes in different prices depending on the kind of unit that you will choose and the length of the rental. You can rent a porta potty in Cornwall for around $160 to $230 per day for short term use. This includes a regular standalone porta potty that has a toilet paper, urinal, mirror, and sink. If you are planning on renting a porta potty in Cornwall over the weekend, you can spend $175 to $280 for a regular porta potty. If you need to rent a porta potty that is handicap- accessible, you may pay around $230 to $300 per weekend. A deluxe porta potty can cost you around $400 to $800 per weekend.