ARIDO was founded in 1934 as the Interior Designers of Ontario (IDO). In 1984, IDO became the Association of Registered Interior Designers when the ARIDO Act was passed in the Legislature of Ontario. The Act was amended in 1999 to permit that only interior designers who meet ARIDO standards might use the title of “Interior Designer” in the Province.
As of December 23, 1999 in the province of Ontario, only those individuals who meet the strict qualifications confirmed by the government in Bill Pr6 are entitled to call themselves Interior Designers. The idea of giving legal standing to the designation of “Interior Designer”, is said to give the title a new measure of respect that reflects the high degree of education, training and formal examination that professional Interior Designers undergo. By consolidating the designation of "Interior Designer," it is thought that it will enhance consumer protection by reducing confusion in the marketplace.