The negotiations between the Westford Education Association (WEA) and the Westford School Committee concluded last June and the new contract went into effect on Monday.
In 5-0-0 votes, the School Committee voted to approve the new contracts for Unit A and Unit G of the WEA.
Unit A consists of all school district employees involved in classroom work excluding teachers' aides and Unit G includes Math and Reading intervention specialists.
The board also unanimously approved new contracts for office professionals and Superintendent Bill Olsen.
Olsen's new agreement, which lasts until 2016, was largely unchanged from his former deal, outside of a small increase for travel fees and $3,000 to be obtained upon retirement.
He also told the board that due to ongoing budgetary difficulties faced by the town, he would voluntarily forego any raises or bonuses he was entitled to, a move he also made in 2012.
Judith Culver was not in attendance for the votes and Chairwoman Angela Harkness needed to leave the meeting early.