Ugyen Choling lhakhang is commonly known as Yonphu lhakhang. The lhakhang was built by Sangdag in the 16th century. According to Tshewang Thinley (2022), Sangdag, the youngest son of tertoen Pema Lingpa is said to have come to Trashigang as per the prophecy looking for a suitable place to build a lhakhang. Upon reaching Yonphu, he gave a blessing to the local people and in return, the community offered the land to him where he decided to build a lhakhang. During the construction of the lhakhang, the evil spirits prevented the construction, and to pacify them, the lam emanated and performed the mask dance in the form of Hom-cham or naked dance. While the spirits were engrossed with the performance, the lam also manifested in the form of two pigs and performed the Saduel Phag-cham to do the groundbreaking to build the lhakhang. Thereafter, it was built without any obstructions. It is believed to be built on a lake. The lhakhang was renovated and extended into the larger structure in 1982 through community funding. Recently in the month of January 2022, the walls of the lhakhang were renovated through gewog funding.