Unionville Consolidated School opened its doors in September of 1923 taking the place of 21 individual school houses. Serving East and West Marlborough, Pocopson and Newlin townships, Unionville was one of the first consolidated schools in Pennsylvania. Built at a cost of $160,000, the new school accommodated 635 students in grades 1-12.

Its location was selected for its accessibility. Originally, only four buses were used for student transport. Other students rode the trolley, walked or were taken by their parents.

The new school represented a change for the students because most had previously attended schools conducted in a single room by only one teacher who taught students from first through eighth grade. The new school offered modern amenities such as electricity, heating and indoor plumbing. The students were also treated to an outdoor playground and a gym/auditorium. The school was a combined public and vocational school offering courses in agriculture and home economics.

In 1927, a new wing was added to provide additional classrooms, a new gym, lockers, improved heating and a sanitary sewage system. Funding for the majority of the project was provided by Pierre duPont.

In 1952, the kindergarten wing was constructed adding new classrooms and a new cafeteria. Again Pierre duPont was a major benefactor.

A 1950 ruling from the state's Council of Education ordered that in the interest of effective administration the minimum size for a merger should be 1,600 students. Officials looked to consolidate with neighboring areas to insure compliance. The suggestion that Chadds Ford should join with Unionville met with a willingness on both sides. In May of 1954, the merger became official and Unionville Chadds Ford School was born. The students from Chadds Ford attend the building in Unionville from grades 7 through 12.

Elementary students shared the building with high school students for nearly 40 years; but in 1959 during the winter break, equipment was moved to a new high school facility. Unionville now housed grades 1 through 6 and in 1972 a kindergarten class was added.

Change came again in 1973 when the district's new middle school opened altering the configuration to K through 5.

When Hillendale Elementary opened to house the district's fourth and fifth graders in 1989, the configuration at Unionville changed once more to K through 3.

Since 1965 many additional renovations have occurred to the building, such as upgrades in heating and plumbing, replacement windows, new floors and ceilings and expanded parking lots and playgrounds.

Not all the changes to the building were planned. A 1994 tornado that struck the area toppled the facade of the building onto the roof resulting in damage to classrooms and the front entrance making it necessary to reposition the dated stone.

Changes to the building are still underway with a new wing planned and the student population returning to K through 5.