This technical note describes each step in constructing a compost toilet. A compost toilet consists of a pair of waterproof vaults that receive excreta, ashes, sawdust, straw and grass. Each vault is equipped with a slab for defecating, a rear opening for removing compost, and a hole for a vent pipe. Constructing a compost toilet involves assembling all necessary labor, materials, and tools; building a base and double vault from concrete or brick and mortar; installing vent pipes, covers for the rear openings, and a pair of slabs. Read the entire technical note before beginning construction.