The longevity of epoxy flooring depends on three important factors: the quality of the epoxy product, how well the concrete is prepared before installation, and the setting. Professionally installed epoxy floor coatings in California can last 20-25 years in a residential or low-demand setting, including a garage, with a new topcoat applied occasionally. In a commercial or industrial setting, epoxy flooring can last anywhere from 8 to 15 years without delaminating, staining, or breaking down.