Four years. The certificate of Guangdong Construction Education Association is valid for 4 years and needs to be handled once every 4 years. Guangdong Construction Education Association is a non-profit professional social organization under the guidance of the Guangdong Provincial Department of Housing and Urban-Rural Development, serving the construction education in Guangdong. The relevant departments, schools, units, organizations and individuals of construction education participate voluntarily. Is an assistant to the competent department of construction education, with legal personality.