Established in 1980, Sayol has been involved in construction industry since 1981. Throughout its progress and continuous development during last 35 years Sayol has achieved : The highest ranking in Construction and Building Services Engineering. Recently, with the renewal of Construction ranking and promotion in Building Services Engineering on the basis of the latest ranking scheme in "Vice-Presidency for Strategic Planning and Supervision" , Sayol obtained: - First ranking in Construction and Building Services Engineering - Ranking 5 in Mining and Industry - Ranking 5 in Road and Transportation Strong belief in engineering visions along with observing technical specifications and use of the latest technical achievements in programming, control and implementing operations has been Sayol's main target and has always tried to deliver the best quality results on time. Accomplished operations until now includes a number of construction operations for great hospitals, industrial projects, residential – office towers and residential buildings in Semnan, Lorestan, Hamedan, Gazvin, Bushehr, Gilan, Khorasan and Tehran provinces. Endorsement letters from contract parties and clients express their satisfaction about our performance in Sayol.