In 1907, the assignment of Fr Constantine Buketoff energized the parish. The parish choir was formed, an adult discussion group on the Faith was begun on Sunday evenings, and normal attendance grew to about 90-120 people. Membership grew rapidly, as there was no other Orthodox churches in central or northern Connecticut. The midnight services for Pascha (Easter) regularly drew about 500 people. Fr Buketoff began regular missionary work, which led to the eventual founding of SS Cyril and Methodius Church in Terryville (1908), SS Peter and Paul Church in Meriden (1911), and All Saints Church in Hartford (1914). He was assigned to Hartford in 1914. Other parishes which find the spark to their beginning in New Britain include: St Nicholas Church in Norwich (1915), Holy Trinity Church in Willimantic (1916), and SS Peter and Paul Church in Springfield, Massechusetts (1916).

In 1913, the need for a larger church building was evident. Property was purchased on Washington Street, the present location, and a new church building constructed. The church was consecrated to the Holy Trinity, which gave the parish its present name. Bishop Raphael (Hawaweeny) came to New Britain when the new church building was built in 1913 to bless the cornerstone. The parish is truly blessed to have the presence of two of the saintly American Orthodox pioneers (Tikhon and Raphael) involved in its growth. The beautiful, five-domed Russian-Byzantine church remains the house of worship to this day.

In 1921, an epic era in the history of Holy Trinity Church began with the assignment of Fr Joseph Dankevich as pastor. Through the crisis of the Russian Revolution and the administrative chaos that prevailed through the Depression, through World War II, into the depths of the Cold War, Father Dankevich served Holy Trinity Church. He died in 1956, still the pastor of Holy Trinty Church. He is buried in New Britain at the church cemetery and the present day Church School is dedicated to his memory.

Fr Sergius Kuharsky, Fr Konstantin Kaminsky, Fr Paul Lazor and Fr Sergei Bouteneff followed in the years after the death of Fr Dankevich. [See list of all the pastors of Holy Trinity.] Through the 1960's. 70's and 80's, the parish went through the movement from the "old style" Julian Calendar to the "new style" Revised Julian Calendar, the translation from Church Slavonic to English and the development and growth of the education programs.

Fr John Dresko, arrived on September 1, 1989. A successful stewardship program was instituted in 1991 and serves as a model for the Stewardship and Leadership training module for the Orthodox Church in America. Other programs of the parish included a regular Church School calendar, the Altar Servers, a choir with a large youth contingent, a visitation group to parish shut-ins, the Sisterhood of the Protection of the Theotokos, and a Men's Club. In 2002 the parish celebrated its 100th Anniversary and in 2004 we celebrated Fr John's 25th Anniversary of Ordination to the Priesthood. Fr John served Holy Trinity for 16 years leaving to become the Director of Development and Stewardship for the OCA.

With the arrival in March 2006 of a new pastor, Fr David Koles, the parish, currently comprised of 150 adults and 10 children, will have new challenges ahead as we continue into our second century.