According to a senior architect at the Public Works Department (PWD), the architect employed to design the mosque was an Italian named Cavalieri R Nolli, who used an early design prepared by His Majesty himself and drawn with the assistance of Awang Besar Sagap, a PWD draughtsman. The detailed architectural plan was prepared by Booty and Edwards Chartered Architects and the construction work was done by Sino-Malayan engineers. The construction costs were very modest between $7.7 and $9.2 million.