The quality and manner of construction and execution of the building and construction stages is the most important factor in increasing the useful life of the building, and the incorrect implementation of the building and the use of substandard materials will lead to the reduction of the useful life of the building in addition to the risks of life in natural disasters, so attention should be paid to the observance of the principles of safety and The established scientific standards require that the implementation of the building and other construction stages be carried out by professionally qualified builders and approved by the competent legal authorities. Competent executor is a person with a license from the building execution office or a legal entity employment license from the Ministry of Housing and Urban Development, who work as natural persons, including engineers with an employment license, technical associates and experimental architects, legal entities and mass housing builders. Anticipation of the use of competent construction contractors in Iran's urban planning laws has long been the focus of the legislator and the first laws related to the engineering