Aedes has updated its SOA certificate which certifies the qualifications obtained with the execution of works in the various areas of construction activity: the specialist categories of demolition (OS23), heating and air-conditioning plant (OS28) and internal electrical, telephone, radio-telephone and television systems (OS30) can be added to the existing qualifications of building (OG1), restoration (OG2), roads (OG3), aqueducts (OG6) and electricity production plant (OG9).