After retirement, Dumas joined the Weld Club, became director of several companies and was an advisor to Sir Charles Court.
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Dumas was responsible for extensive land development in the district governed by the Albany Zone Development Committee, and negotiated the establishment of an oil refinery, steel rolling mill and cement works at Kwinana.
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Dumas House, a State government office building, is named in his honour.
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A bronze plaque with Dumas's name was laid in the footpath of St Georges Terrace, Perth as part of the WAY 1979 celebrations to commemorate 150 notable figures in Western Australia's history.
Bertrand Russell | Alexandre Dumas | Russell Crowe | Frederick Russell Burnham | Russell Simmons | Kurt Russell | Russell Brand | Ken Russell | Leon Russell | Rosalind Russell | Russell Street | Russell Mulcahy | Nipsey Russell | George Russell | Russell Street, Melbourne | James Russell Lowell | Russell Howard | Russell Drysdale | John Russell, 1st Earl Russell | John Russell | Jane Russell | Dumas | Willy Russell | Russell | Lillian Russell | George Russell (composer) | Bill Russell | Russell Slade | Brenda Russell | Russell Square |