0219 GMT November 20, 2018
The inaugural ceremony of the expo was attended by Iran's Minister of Roads and Urban Development Abbas Akhoundi, IRIB reported.
More than 900 domestic and foreign firms are taking part in the international event.
Representatives from Norway, Italy, Germany, Brazil, South Korea, India, Finland, France, the UK, Hong Kong, Switzerland, Australia, Austria, Japan and Spain have set up pavilions at the exhibition, the report added.
The three-day exhibition is aimed at developing construction style, promoting employment and creating a commercial atmosphere conducive to competitiveness with international companies.