Legislators and education officials Thursday celebrated the start of a $90 million renovation project at Solomon Elementary School that will completely overhaul the Wahiawa campus and provide dozens of new classrooms in modern facilities.

The school, located on Schofield Barracks, is getting a face-lift with the help of a federal grant from the Department of Defense totaling more than $70 million, and another $20 million in matching funds from the state Department of Education.

The funds will be used to build four two-story buildings that will house 63 new classrooms, a student support center, two computer labs, an audio and video room, a cafeteria and administrative offices. The project also includes a covered play court, new entrance driveways and more than 170 parking stalls.

“The improvements will give the campus an entirely new footprint and create four state-of-the-art buildings that will provide an array of opportunities for our kindergartners through fifth graders, in support of our military students,” Keith Hayashi, interim schools superintendent, said in a news release.

The department said the work will be completed in phases over four years, with completion slated for summer 2021. The school’s existing buildings, play field and play courts will be demolished and replaced.

Solomon Elementary, which opened in 1969, serves mainly military-­dependent students. The school had 933 students enrolled in kindergarten through grade 5 last school year.

The campus was one of several public schools on Oahu military bases ranked in a 2011 study of Department of Defense school facilities. Schools were rated on their physical condition and capacity to accommodate students, and the worst-rated schools were invited to apply for federal grants.

Solomon was ranked 28th worst among the 160 schools studied nationwide.

The other Hawaii schools cited in the report included Daniel K. Inouye Elementary (ranked ninth worst), also on Schofield Barracks; Mokapu Elementary (33rd worst) at Marine Corps Base Hawaii; and Shafter Elementary (36th worst) at Fort Shafter.

Inouye Elementary recently completed a $33 million renovation project — with $26.6 million from a Defense Department grant and $6.6 million in state matching funds — that added several new buildings and upgraded facilities at the nearly 60-year-old campus.