Cheshire West & Chester Council said Rudheath High School in Northwich will reopen on Tuesday morning after a gas explosion at an adjacent dental practice caused it to remain closed.
The council's building surveyors were called to the school, located off Shipbrook Road, following the incident shortly after 7am on Monday.
The council said the surveyors did not find any major structural damages but a block of three classrooms will not be used on Tuesday when the school opens for the first time since the half term break.
A spokesman for the school told Place: "Parents are being told the school is open by our text message system."
The school used the same system to alert the parents of 620 pupils of its closure on Monday morning, with only 20 pupils being sent home on arrival.
The explosion has blown out several windows in the property. No one was reported injured.