Darre-Jenssen was also a member of the board of Oslo Port Authority, and from 1907 to 1910 he chaired the board of Kristiania Gasverk. He was also a member of the board of the Norwegian Red Cross, serving as its president from 1913 to 1917. He received a Red Cross honorary medal, and was decorated as a Commander with Star of the Royal Norwegian Order of St. Olav and a Knight of the Order of the Dannebrog, the Order of the Polar Star and the Order of the White Rose of Finland. He died in June 1950 in Oslo.