The final tally: $69.5 million, which means a savings of $700,000 for the town once the math for state reimbursements is complete.
The high school opened in the fall, easing overcrowding in all Grafton schools due to a town wide school realignment.
McCarthy said some project costs were uncovered by the Massachusetts School Building Authority, including $250,000 for a left hand turn lane on Providence Road and $1 million for a second turf field.
Town Administrator Tim McInerney asked if the funds would be freed in time for May’s Town Meeting. McCarthy could not predict when the final reimbursement from MSBA will be made.