Personal Parish of Church of Assumption - Trilokpuri & Mayur Vihar Phase - III was erected by Archbishop, Most. Rev. Dr. Vincent Concesavo by his ‘Decree of the Creation of Personal Parishes for the Orientals’ dated May 14, 2003. By this decree, IP Extension also came under this personal parish. The establishment of parish came in to effect from July 1, 2003. His Excellency Rt. Rev. Dr. Anil Couto, Auxiliary Bishop, installed Fr. Joshy Vezhaparambil as the first vicar of the new parish on July 28, 2003, on the occasion of the feast of St. Thomas. Fr. Antony Kilukkan, who was appointed assistant to Fr. Joshy in 2004 is looking after the IP Extension community.
Rev.Fr. Babu Kalathil was the Pries- in - charge after Fr.Antony Kilukkan. He When he transferred to Rohini Parish on 5th August 2007, Fr.Dominic Kachapilly took charge of the parish. And Fr.George Punnackal succeeded him  26th September onwards.

Though the parish is at an infant stage, it had developed most of the pastoral set up required for the spiritual and cultural needs of the parishioners, such as, Family Units, Parish Council, Youth Group, Christeen Prayer Group, Choir Group and Altar Servers etc. All the children in the parish are educated in their Christian life by a dedicated team of catechism teachers.

Centre at a glance
Name:	Church of Assumption.
Address:	Bl.Mother Teresa Church, IP Extension
Parish Priest:	Fr. John Chozhithara
Asst. Priest and Priest in charge:	Fr. George Punnackal.
Contact address:	218-A, Pocket-A, Phase II, Mayur Vihar, New Delhi - 110091; Tel. 22775557; Mobile: 9911109323
Area:	I.P Extension,Mayur Vihar Phase II and Gazipur.
Members:	800
Religious House:
Other Institutions:
Feast:	Mother Mary
Activities:	* Catechism * Altar Servers * Family units * Choir Group * Charismatic Group * DSYM