The oldest state police barrack in Maine — the Thomaston building — will close July 1.

Col. Patrick Fleming, the chief of the Maine State Police, said the decision was made as a cost-saving measure. He said the finance staff in the public safety department projected the closure will save $48,000 annually.

Fleming said much of the savings will be from utilities but there will be savings from reduced supplies as well.

The state owns the building, which was constructed in 1940. The Thomaston barrack is the only one of eight in the state to close.

Fleming said the department had to come up with reductions in its budget and the closure of the Thomaston barrack was one of the recommendations. The governor’s office agreed and included it in the budget package sent to and approved by the Legislature.

The staff members who operate out of the building in three shifts will be relocated to space in Augusta, Fleming said. He said response time for the region will not be increased by the relocation. He said troopers will continue the regular patrols they have now with the base in Thomaston. He said reports can be done by remote computer so troopers will not have to go to Augusta to file them.

Troop D was proposed for closure because its patrol area is near Augusta, Fleming said earlier in the year.

Troop D patrols Knox, Lincoln, Waldo, and Sagadahoc counties, the southern half of Kennebec County, part of northern Cumberland County, and Interstate 295 from Brunswick to Gardiner. Troop D’s staff consists of a lieutenant, three sergeants, 24 troopers and a secretary.

The Thomaston building was renovated and expanded in 1994.

The other state police field troop barracks are located in Orono, Gray, South Portland, Skowhegan, Alfred, Ellsworth and Houlton.

Fleming said the Maine Bureau of General Services will decide what to do with the Thomaston building, which is adjacent to the former Maine State Prison property that is now owned by Thomaston.

Chip Gavin, the director of the Bureau of General Services, said the Legislature has already authorized the department to sell the property. He said the town has expressed interest in making it part of the adjacent Thomaston Green.