On Yapi Mühendislik Mimarlik İnsaat Taahut San. Ve Dıs Tic. Ltd. Sti. was established in Gaziosmanpasa in 2005. Company has operated in heating, cooling and ventilation, engineering and contract works of buildings, factories and workplaces since its establishment. In 2007 company also started be active in insulation and facade cladding industry. Company has manufactured and sold insulation
materials under its brand name since 2009. In 2011 company started to manufacture eps insulation products in 3000 m2 closed area and in 2012 company started to manufacture building chemicals. On Yapi aims to be a well known establishment in the world.