The construction site of the Church was chosen by
Vazgen I, the Catholicos of All Armenians, in 1991 and the ground blessing service was conducted in the same year. The construction started in 2003 by the initiative and funding of philanthropist
Hrant Vardanyan. In 2015, the construction of the Church was completed by his sons, Mikayel and Karen Vardanyans. The Church, built with the blessing of Vazgen I, the Catholicos of All Armenians, was named after the Apostle St. Thaddeus. On October 4, 2015, the
Catholicos of All Armenians Karekin II, consecrated the Saint Thaddeus Church. The hall for candle lighting is located at the entrance of the Church. A memorial fountain dedicated to Hrant Vardanyan, is installed in the yard of the Church. On April 24, 2016, by the initiative of philanthropists Mikayel and Karen Vardanyans, a
khachkar was placed in the yard of the Church, in honor of the 1,5 million canonized martyrs of the Armenian Genocide. The khachkar was carved of a whole tuff stone by Artak Hambardzumyan. In 2021, with the blessing of Garegin II, Catholicos of all Armenians, Diocese of Masyatsotn was founded in Ararat region, and the Saint Thaddeus Church was chosen as the chancery. In 2025, on the initiative of Mikael and Karen Vardanyan, the second floor of the chancery of Diocese of Masyatsotn was built. The church candle-lighting hall, where 12 icons are installed, was completely reconstructed and expanded. == Architecture ==