Abstract: ADA-compliant, portable bathroom modules provide safe, easily installed complete or partial bathrooms in a room of a home or building and are easily removed when no longer needed, without permanently changing the appearance of the home or building. The units form an enclosed structure having a roof with a ventilation fan, and door. The modular design allows a complete bathroom or a portion thereof to be selected, as desired, by the user. The complete model includes a shower module, a toilet module and an intermediate hallway/center module. A portion of a complete bathroom includes a shower module or toilet module alone (⅓ unit), or together with a hallway/center module (⅔ unit) to enhance access. The complete bathroom or portions thereof may include a back flush toilet and sewage ejection pump to accommodate installation on a concrete slab, an integral (instantaneous) water heater to allow a cold water only hook-up, and a wall mounted body dryer.