In 1958, the school moved to its current site, having purchased the 5-acre (20,000 m2) Edgar S. Smith estate, which included the pre-American Revolutionary War Henry D. Phillips House.

The first decade of the "new" Chapin, incorporated in April 1951, saw a growing student body, administrative stability and the acquisition of a permanent site for the school.

Following Mrs. Chapin's death, classes were held for three years in a rented house at 11 Mercer Street.

In 1954, the school moved to "Snowden," which it leased from Bernard Kilgore, publisher of The Wall Street Journal and The Princeton Packet.

In 1958, Chapin moved to its present location in northern Lawrence Township, having purchased the five-acre Edgar S. Smith estate, the centerpiece of which was the pre-Revolutionary War Henry D. Phillips House.