Sebago Brewing Co. next week will unveil its huge expansion plans for a new home in Gorham.

The company, now headquartered in Gorham Industrial Park, is seeking town approval to build a facility on lower Main Street (Route 25) in Gorham on a portion of the so-called Ross Grant, a large tract that the Shaw Brothers Family Foundation recently bought.

Sebago Brewing is requesting permission to construct a brewery, restaurant, event and function center, manufacturing and warehousing space and corporate offices on a 4.45-acre site.

“It’s a big one,” David Galbraith, Gorham’s zoning administrator, said Wednesday about the proposal.

The company is on the town’s Planning Board’s agenda for a pre-application discussion at 7 p.m. on Monday, June 6, in Gorham Municipal Center, 75 South St. Galbraith said the town’s Planning Department has had a couple of meetings with Sebago Brewing.

“We’re excited,” Galbraith said.

Kai Adams, Tim Haines and Brad Monarch, founders of Sebago Brewing, could not be reached for comment Wednesday by the American Journal deadline.

The site, zoned industrial, is part of the 258-acre property that Shaw Brothers Family Foundation bought this year from ecomaine, the regional waste and recycling company owned by 20 municipalities, including the town of Gorham. The location at the eastern gateway to Gorham and near the town line with Westbrook is on a heavily traveled commuter arterial.

The brewery would lease the site for its facility from the nonprofit foundation established by Jon Shaw and Danny Shaw, owners of Shaw Brothers Construction Inc.

“We have a tentative deal with Sebago Brewing,” Jon Shaw said Wednesday.

But, Shaw said, the deal hinges on what the Planning Board would require. Sebago Brewing has previously said it had outgrown its facility in Gorham Industrial Park and town officials have hoped to keep the brewery in Gorham.

The foundation has big plans of its own to restore 100 acres of the mostly wooded site to farmland and preserve open space for public recreation that would include trails for hiking and cross-country skiing. The foundation would construct a mile-long road through the property for public access to the Presumpscot River.

Jon Shaw said the foundation hopes to begin its work at the site this year.