Castle Island Brewery South Boston

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  • Event Space 1 Rendering
    Event Space 1 Rendering
  • Event Space 2 Rendering
    Event Space 2 Rendering
  • Main Entry Rendering
    Main Entry Rendering
  • Tasting Room 1 Rendering
    Tasting Room 1 Rendering
  • Tasting Room 2 Rendering
    Tasting Room 2 Rendering
  • Tasting Room Focal Wall
    Tasting Room Focal Wall

Project details

Castle Island Brewery South Boston

Boston, MA

In late 2020, Kaplan Construction was hired to perform a 9,500 SF fit out at 10 Old Colony Avenue in South Boston to house a new craft brewery for Castle Island Brewing Company, the tenth largest brewery in Massachusetts in a ranking by total 2020 beer production, according to the Boston Business Journal.

Located within a turn-of-the-century high-bay manufacturing building, the brewery features a 4,000 SF main tasting room with seating for 220 people, a retail area, and a 1,900 SF private event space which accommodates 140 people. A quarter of Castle Island’s new space was reserved for the brewing operations, including a brewhouse and seven 10-barrel tanks. A large focal wall was manufactured from wood and metal and feature the Castle Island Brewing Company logo. Kaplan cut out a section of the existing exterior wall and installed a new overhead door to create a seamless indoor/outdoor experience and maximize natural light. In addition to removing a series of interior overhead doors, Kaplan demolished existing walls at the front of the building to make room for tap room seating and new bathrooms. Two existing glass garage doors remain to provide access to an outdoor patio for brewery patrons.

At the start of construction, Kaplan uncovered several unanticipated existing conditions in the century-old building despite multiple exploratory efforts performed by the design team and landlord. During concrete removal to accommodate the underground plumbing, it was discovered that the slab was three times as thick as the original exploratory work indicated. As such, the construction team had to work with the structural engineer on determining the best approach to address the cutting and infilling of the structural slab. Numerous underground obstructions, such as abandoned concrete structures, construction debris from past projects, and layers of old concrete slabs, were also encountered as the team excavated for plumbing to service the bar and brewing area. As demolition progressed, it was also revealed that the original bathroom plumbing had deteriorated significantly and required a full replacement.

The brewery and taproom opened in September 2021.

Renderings courtesy of Joe the Architect


Castle Island Brewing Company


Joe the Architect

Services Provided

  • Preconstruction Planning
  • Construction Management