LJ Purani & Associates is one of the leading design firms in India to integrate structural engineering and architecture under one roof. The firm ventured into engineering design in the year 1986. In the last 40 years, it has designed many state of the art manufacturing plans for food, pharma, textile mills, chemicals, dairy and engineering units. The company has designed many textile mills such as M.H. Mills ltd, Bihari Mills ltd and Vijay Mills ltd. Many chemical plants such as Matangi Industry, Vihita Chemicals, Eclate Chemicals, Nutan Chemicals, SD Finechem ltd etc. Dairy industry building for Amul, Vadilal icecream and anmol dairy. High performance engineering units such as Indigo airplane workshop at Delhi, Nova bearing at Changodhar and Khatau Engineering unit at Ankleshwar.