In 1903, he was married to Sada Kaur of Sodhra. In 1905, he returned to the Punjab, and took over as a sub overseer on the Upper Jehlum Canal. In the Punjab, he came under the influence of Sant Afar Singh of Mastuana. In 1912, he resigned his government post to become a contractor. He supplied red stone for New Delhi buildings, including the secretariat and the viceregal lodge.
In 1928, he was given by the British Government the title of Sardar Sahib, followed by Sardar Bahadur in 1930. True to his name, Dharam Singh helped humanitarian causes and contributed to public charity. For promoting education among the Sikhs, he founded a trust called Guru Nanak Vidya Bhandar. The trust runs a school of Sikh studies at Gurdwara Rikabgarij, New Delhi. Sardar Dharam Singh died in Vienna (Austria) on 19 June 1933. Vaid, Mohan Singh, Sajjan Vichhora. Tarn Taran, 1933
References :
1. Dukhi, Munsha Singh, Jivan Bhai Sahib Bhai Mohan SinghJl Vaid. Tarn Taran, 1939
2. Vaid, Mohan Singh, Sajjan Vichhora. Tarn Taran, 1933