ROCKLAND, Maine — Groundbreaking for the long-planned expansion of the Knox County public safety complex is scheduled for Tuesday morning.

The Knox County Commission voted unanimously Tuesday to award the construction contract to Ganneston Construction Corp. of Augusta for $1,212,286.

Six companies submitted bids, County Administrator Andrew Hart told commissioners at the meeting. Twelve construction firms had attended a bid preview in June but only six submitted bids.

A formal groundbreaking ceremony is scheduled for 8 a.m. Tuesday at 301 Park St., which is the building that most recently housed Village Soup offices.

Knox County voters agreed in November to allow the county to borrow up to $2.5 million to buy 301 Park St., renovate the building, put on an addition, and install new communications equipment.

The county will open bids Aug. 24 for the communications equipment part of the project.

Once the project is complete, the sheriff’s patrol and the Knox County Regional Communications Center will move from its current space in the public safety complex over the adjacent 301 Park St. building. The county’s emergency management agency, located in the basement of the Knox County Courthouse, will also move to 301 Park St.

The county paid $500,000 for the 301 Park St. building.

The county has been looking at expansion options for the public safety complex since 2007. The current public safety building, which includes the jail, was built in 1991.