Fr. Jose Querexeta, CMF former diocesan bishop of Basilan Province, acquired a 29,101 square-metre lot in UP Village, Diliman, Quezon City.
Fr. Miguel Mialet, CMF supervised the construction of the first permanent building.
Fr. Santiago Gonzalez, CMF became the first director and principal. He held the post from its first year of operation until 1981.
Fr. Gonzalez was succeeded by several other Claretian priests like Fr. Julian Mateos, CMF; Fr. Jesus Vasquez, CMF; Fr. Emilio Pablo, CMF; Fr. Luis Fernandez Rey; CMF and Fr. Domingo Moraleda, CMF.
A very successful institution
Fr. Renato B. Manubag, CMF is the current school director.
Claret School of Quezon City is composed of three departments, namely, the Pre-school, Grade School and High School departments.
The Pre-school accepts boys and girls with the following ages: 3- to 4-year olds for Nursery and 5-year olds for Kinder.
The Grade School and High School departments, from Grade 1 to 7, and from 1st Year to 4th Year, are exclusively for boys. Grade 1 begins at age 6.
The Grade School department of Claret School of Quezon City was formally accredited by the Philippine Accrediting Association of Schools, Colleges and Universities (PAASCU) on March 15, 1978.
Thereafter, it was granted reaccreditation until 1982, 1988, 1994, 2000, 2005, 2010 and the latest is until 2015, attesting to the high standards which the Grade School has achieved in the areas of faculty, administration/school staff, curricular programs and instruction, instructional media center, student services, student activity program, and facilities.
Meanwhile, the High School department received its formal accreditation in 1991. Thereafter, it was granted reaccreditation until 1995, 2001, 2006, and 2011. It had its last reaccreditation visit in February 2011 and received another reaccredited status until 2016.
Aside from its membership in the PAASCU, Claret School of Quezon City also takes active roles in the Catholic Educational Association of the Philippines (CEAP), Association of Private Schools Administrators, Inc. (APSA, Inc.) and QC-Marikina Grade School Consortium (QC-MGSC).
In School Year 2003-2004, the Association of Claret Schools in the Philippines, Inc. (ACSPI) was organized, thus linking CSQC with its counterpart schools in the South, namely Claret School of Zamboanga City and Claret School of Tumahubong.