In the early 20th century, rubber estates were established in
Berakas, Gadong, and
Temburong, with allocated for plantations by 1914. By the mid-1920s, Joss' Coghill was overseeing the Gadong Rubber Estate. In 1923, the Island Trading Company-owned estate in Gadong expanded in size. Despite the
discovery of oil in Seria before 1931, rubber estates in Berakas, Gadong, and Temburong initially saw slow financial returns from the emerging oil sector. A 1933 report noted that malaria cases at the Gadong estate were relatively low compared to other estates. By 1934, the estate had a population of 53, with 32 laborers. However, the Government Rubber Estate at Labu (
Labu Estate), along with those at Gadong and Berakas, struggled financially, accruing debts amounting to
B$221,828.65 by the end of 1965. The state auditor raised concerns about these growing losses in 1966. The development of Gadong accelerated in the 1960s, following the construction of a bridge connecting
Brunei Town to Jalan Gadong and the establishment of key government facilities, such as the Gadong Power Stations, Police Headquarters, and the Land Transport Department. By 1967 or 1968, the completion of Jalan Gadong and its later connection to Jalan Tutong in the early 1970s spurred further expansion. Prior to the construction of this road, the only access to Gadong from the capital was by barge along the Menglait River. == Infrastructure ==