The temple underwent restoration during the tenure of the Supreme Patriarch (Thieng). When Prince
Damrong Rajanubhab of Siam visited Phnom Penh, he described the temple as follows: "I visited Wat Ounalom, which is the temple of the Supreme Patriarch of the Mahanikaya Order, located north of the Royal Palace. Among the temples in Phnom Penh, whether royal or public, even those of ancient origin like Wat Ounalom, were often rebuilt during the reign of King Norodom, when Phnom Penh was established as the capital. Later, the old ordination hall (ubosot) was demolished and replaced by a new one. Construction of the new building began in 1957 and was completed in 1960. A merit-making ceremony celebrating its completion was held for four days and three nights from June 1–4, 1963. The new ordination hall is a three-story structure." During the
Khmer Rouge period, Wat Ounalom suffered severe destruction. However, it was rapidly restored afterward and has since become one of the most important religious and tourist sites in Phnom Penh today. ==Architecture==