Building Our DIY Composting Toilet – A Crappy Situation



The fact is the toilet is one of the most used pieces of, let’s call it, “furniture” in the house. When we start talking about the toilet for the Wanderlust Bus we wanted to make sure whatever we chose would meet some specific requirements. The unit needs to be attractive, movable, cleanable, built with easily replaceable parts, and comfortable.  The only thing that meets all of those requirements concurrently is a DIY composting toilet, handmade to our specs.

We begin our search, as always, researching the other commercially available options. We found some consistent factors, but none of them were good.


  1. EXPENSIVE – Even though there are a number of options available, none are what one could consider “budget-friendly” composting toilets. Prices vary wildly but a good average is right around $1000. A grand for a container for me to poo in seems ridiculous. The solution – DIY composting toilet.
  2. BULKY – The commercial composting toilets are also VERY large. Some have a very large footprint. Granted, there are some that have a footprint that is very similar to the one we are making here but ours doesn’t require room to turn some handle. The solution, again, is a DIY composting toilet.
  3. UGLY – Let’s face it, a toilet isn’t necessarily going to be an art piece, but the commercial units are almost all eyesores. Molded plastic, weird shapes, collection containers in plain view, all of these things are why people have a negative connotation of composting toilets in general. Solve all these issues, you guessed it, by building a DIY compositing toilet.
diy composting toilet

Our DIY composting toilet solves all of these issues and has all of the features that the best commercial batch units have.

We started by finding a seat that we really liked. We are choosing a seat that also has an integrated child seat built in. This cuts down on the ability for it to get lost, damaged, or intentionally thrown in the toilet by a little. We went with a Bemis Next Step Elongated Seat with slow close lid and integrated potty seat (you can find it here).

We also had to find a urine diverter. The reason for this is that if you separate #1 and #2 you can significantly cut down on the offensive smells that emanate from the unit. The urine diverters that are readily available are all plastic, cheap, and could easily be considered disposable and that is something we are trying to avoid.

Fortunately, we found a solution. All the way over in Serbia, there are a couple artists in an Earthship who solved our issue. The Marcel is a handmade porcelain urine diverter and it’s truly a sight to behold. I know this sounds extreme for something that is essentially a pee funnel but it’s true.

Smilja and Bojan are those artists and are just that. They handmake these in small batches and ships them all over the world. If you want to know more about the Marcel urine diverter you can check out the website, here. You can also see some images showing the production process below.

diy composting toilet

Smilja and Bojan are also a big part of Earthship Serbia, the first earthship in Serbia and they are showing their region that there are other options to build your forever home than traditional sticks and bricks. You can find more about their work on Earthship Serbia’s Facebook page.

After receiving our special deliver from Serbia, no thanks to the postal strike…lol. We moved on to putting everything together. Barrel staves for the sides to keep the ply top and bottom supported then wrapped up in white metal sheeting and covered in EcoPoxy.

It was a learning process and it turned out better than we could’ve imagined. Check out the video below for how we did it and the final product is sitting right over there. If you have any questions when you start building your DIY composting toilet, feel free to ask and I’ll be glad to help.

diy composting toilet

6 thoughts on “Building Our DIY Composting Toilet – A Crappy Situation

  • Nice build of a toilet box.
    How do you remove the compost bucket? You commented that you were installing a rear wall. Typically one would expect the top of the box to hinge upward so the box remains in place. That doesn’t seem feasible with your design.

    The Urine Separators cost over $100. They look excellent but expensive.

    • Hey Ana, the bucket is removed from the rear of the toilet. It makes it so there’s no top hinge but does give it a better look. This also allows for the entire cabinet to be coated and sealed so that none of the wood can harbor any nasties!

    • Hey Chuck, the toilet drains into some tubing that then diverts into the bay of the bus where we have a 5-gallon diesel (cause it was yellow) can. We then empty that every couple of days into a rest stop toilet or somewhere into the ground. FYI, the urine into the ground is spectacular for the earth, our planet is seriously lacking nitrates in the soil.

Leave a Reply

Your email address will not be published. Required fields are marked *