Researchers at the University of British Columbia have unveiled the MycoToilet, the world’s first fully waterless, mushroom-powered toilet framed using dowel-laminated timber panels. Showcased on the lawns of UBC’s Botanic Gardens, the wedge-shaped toilet converts human waste into nutrient-rich compost without the use of plumbing, chemicals, or a single drop of water.
“What’s novel about this project is that it’s a modular, common-sense solution to a widespread problem,” said Professor Joseph Dahmen, who developed the MycoToilet’s prototype. “Traditional chemical toilets smell unpleasant and convert a valuable resource into toxic waste. We’ve wrapped the whole system into an architecturally compelling package that smells good, looks good and works seamlessly. It’s something a municipal government could order and install immediately.”
“The purpose of building this was to demonstrate a truly modular technology,” Dahmen added. “More than just another technical solution, it’s a complete rethinking of how we handle human waste in urban environments.”
Prefabricated off-site, the toilet arrives as a precision-cut kit of CNC-milled, dowel-laminated panels. Stainless-steel dowels driven through intersecting timber members lock each panel into airtight, load-bearing joints without metal plates or adhesives. On-site crews slot the panels together, press in the dowels hydraulically and complete assembly in hours—cutting build time by more than half compared with conventional light-frame construction.
Installed in a grove of mature Douglas firs near the entrance to UBC’s Botanical Garden tree walk, the wedge-shaped shell sits atop a fern-lined ramp leading to a sliding timber door. Inside, waste drops onto a grated floor lined with mushroom mycelium. The fungal network metabolizes solids, neutralizes odours and converts effluent into sterile, nutrient-rich compost while acting as a biofilter that prevents leachate from escaping into surrounding soil.
Vertical timber slats wrap the exterior for natural ventilation and privacy, while a planted green roof filters rainwater and integrates the structure into its forested setting. Plumbing fixtures supplied by TyAx Plumbing & Heating slot seamlessly into pre-drilled chases, allowing municipal crews to hook up the system with standard tools and minimal site disturbance.
Earlier prototypes of the MycoToilet were deployed in refugee camps, where rapid, off-grid assembly proved essential. However the current installation demonstrates how fungal-powered sanitation can scale to urban environments—offering a drop-in solution with no pipes, no chemicals and zero compromise on design.
