Good bathroom design requires understanding of ergonomics principles. An ergonomic design can be described as the one which is user friendly. Ergonomic design focuses on maximising comfort for maximum no of people.
A database has been prepared on the measurements and capabilities of the human population in relation to the use and design of workspaces. The two basic requirements are clearance and reach.
Working height is an important element to consider when designing a comfortable workspace. Working height cannot be too high and too low.
A person may not require a grabrails in bathroom at the age of 35 but designer should be aware that they may require that at a later stage and should provide a provision i.e. a support structure within the wall cavity when the bathroom is built.
Universal design is a term used to refer to design which takes into account the majority of people regardless age and ability. This depends on simplicity and flexibility and not specific to any age group or disability.