Stockwell is the managing director of the family-owned and Queensland-based property development, investment, and management firm, W. A. Stockwell Pty Ltd. He and his brother-in-law Mike Kelso are co-owners of the company that was established as a construction firm by his parents more than sixty years prior. The firm has had successful development ventures in residential, leisure, retail, commercial, and industrial property, and has undertaken a phased AU$350 million residential development in Brisbane's West End. He and his family members were included among the 14 new entrants on the 2014 "Rich List," with a combined estimated net worth of AU$101 million.