Toilets that are labeled as handicap must meet ADAAG requirements. They must be 17 to 19 inches above the finished floor to allow easy access to people in wheelchairs. Normal toilets are generally around 20-22 inches high.
ADA Accessibility Guidelines are rules for accessibility to buildings and facilities by individuals with disabilities. These requirements stemmed from the Americans with Disabilities Act of 1990. Handicap restrooms are required to have a minimum width of 60 inches, allowing wheelchairs to be parked on either side of the toilet. Horizontal bars are required to be mounted high as well. ADAAG also allows for additional compartments and hand rails on either side of the toilet.