Barrier-free showers for handicapped residents are installed to give the safest and most independent showering experience to persons who would otherwise require assistance. There are strict guidelines set out by the ADA that must be adhered to when installing such a shower, and there are different types of showers available to follow the guidelines and to serve specific needs.
It is important that the shower a handicapped person is going to use is as easy to get in and out of as possible. Some people can maneuver over a small lip, used to keep water in the shower and to keep it off the bathroom floor, but some can't manage the lip because they need to get a wheelchair into the shower. There are showers free of any type of barrier or lip; these have barrier-free shower pans to catch the water.
Make sure you study the guidelines laid out by the ADA before beginning. Choose your shower. The convenient aspect of barrier-free showers is that they are often designed to replace your standard domestic bathtubs. Installing one can be done after you've completed the demolition of your existing bathtub and done some repair work and carpentry finishing work to the area. Hire a plumber to put in the piping you'll need for the shower. Follow the manufacturer's directions to install the new barrier-free shower, most likely putting in a shower pan first and going through a set of steps before ending with moisture-resistant drywall.