CUMMING — The price appears to have increased for a new alternative public high school in Forsyth County.

During a recent special called meeting, the Forsyth County Public Facilities Authority voted 5-0 to modify from $20 million to $30 million the amount of funding from the authority for the Alliance Academy for Innovation of Cumming-Forsyth County.

Jeff Bearden, superintendent of Forsyth County Schools, who took part in the meeting Friday by phone, said the total cost of the school would be about $42 million, with the state contributing about $12 million. The original $20 million figure was an early estimate.

“We didn’t have even the drawings at the time, and we really shooting from the hip,” he said. “So it’s actually more than what we had said early on. But again, we were not into final programming, exactly what we were going to need for square footage, so it is more than it was then.

“Now we know exactly what we are pursuing, and this is much more of a hard number.”

The authority, a county vehicle for funding construction of public facilities, will issue revenue bonds to pay for the school’s construction. In September, it approved the $20 million in funding.

Approving the school is the first project for the authority, which was created in 2008 and first assembled in 2011.

The school, which is slated to open by 2018, will focus on high-demand, high-growth, high-wage careers, join with local universities and businesses and offer training and certification in a dual-enrollment-style system

At a recent meeting, the Forsyth County Board of Education voted to buy 23 acres for the school from the city of Cumming for $3.1 million.

As proposed, the property at 1100 Lanier 400 Parkway off Ga. 400 will include a three-story building featuring a makerspace, classrooms, business center, Junior Achievement facility and two-story atrium-style cafeteria, among other learning and design aspects.

The academy will take fewer students and cost less money than a conventional high school, though it will spend about the same on a per-student basis.

Though the school will save funds by not having athletics facilities, other than a gym required for physical education, labs and other facilities will increase costs.

During the meeting, the authority also unanimously approved several items tied to legal issues involved in issuing the bonds.