The city government and education bureau helped establish a high school annex out of two housing units of Lagro Block 59.

On June 13, 1974, Novaliches High School opened with an enrollment of 87 students.

In August, the annex was transferred to share the Lagro Elementary School compound, with a new principal and three teachers.

[3] In 1977-78, the school had an enrollment of 774, and in June 1978, it expanded to a 1.3-hectare (3.2-acre) site with an annex building consisting of two stories and 18 classrooms.

[2] As the only high school in the Northern Metro Manila, Southern Bulacan, and Western Rizal region,[1] the number of students attending Lagro High School has grown over the years.