H.E. Callahan provides construction services for a wide variety of commercial customers, many of them with multiple repeat projects. Over the years we have completed retail, grocery, banking, theaters, automobile, and warehouse projects.

  • Androscoggin Savings Bank
  • Cianbro Corporation
  • Good Shepherd Food Bank
  • Hannaford Brothers (RBS)
  • Sunday River, Boyne Resorts


H.E. Callahan regularly works with a variety of governmental agencies completing needed public improvements. These include civil, parking structures, renovations, and new office buildings.

  • City of Auburn
  • City of Lewiston
  • Department of the Navy
  • Kennebunk Water District
  • Lewiston Housing Authority
  • Maine Bureau of General Services
  • Maine Department of Fish and Wildlife
  • Maine Department of Human Services
  • Maine Turnpike Authority
  • Town of Carrabassett
  • Town of Livermore Falls
  • Town of Norway
  • Town of Rumford
  • Town of Skowhegan
  • U.S. Department of Commerce
  • U.S. Postal Service


H.E. Callahan has a long history of building quality elementary and secondary educational facilities in Maine. Recent projects include both new and renovations projects for public and private schools.

  • Bonney Eagle High School, MSAD #6
  • Central Maine Community College
  • Governor Baxter School for the Deaf
  • Hebron Academy
  • Lawrence High School, Fairfield
  • Lewiston School Department
  • MSAD #61, Farmington
  • School Union #29, Mechanic Falls
  • Southern Maine Community College
  • Westbrook School Department


H.E. Callahan is unique in our ability to self-perform much of the work required by our industrial clients. We regularly complete civil, hydro-electric, substation, manufacturing, and storage projects. Most of our clients are long-term repeat customers who count on our quality and reliability.

  • Atlantic Salmon Federation
  • Bangor Hydro Electric Co.
  • Brookfield Renewable Energies
  • Central Maine Power Co.
  • ES Boulos
  • International Paper Co.
  • Pine Tree Waste Inc.
  • Pratt & Whitney Inc.
  • Tex Tech Industries
  • Town of Kingsbury


H.E. Callahan has extensive experience in the healthcare market, completing multiple projects in most of the major hospitals in Central and Southern Maine. H.E. Callahan is experienced in OR, ICU, and Imaging Facility renovations. H.E. Callahan has completed the construction of both a large medical office facility and the first hospice house in the State of Maine. We are experienced with both new and renovation projects and adept at working in sensitive occupied spaces. Our staff members are trained in Interim Life Safety requirements and infection control procedures and our managers have ASHE Health Engineering Certifications.

  • Androscoggin Home Health
  • Central Maine Healthcare
  • Central Maine Medical Center
  • DaVita Dialysis, Inc.
  • DFD Russell Medical Center
  • MaineGeneral Medical Center
  • Mount Desert Island Hospital
  • Rangeley Regional Health Center
  • Saint Mary’s Regional Medical Center
  • Schooner Estates
  • Sisters of Charity Health Systems
  • Stephens Memorial Hospital



H.E. Callahan has considerable experience in constructing facilities for institutional clients. These include numerous libraries, colleges, and non-profit organizations, including additions and renovations to existing facilities.

  • Auburn Public Library
  • Bangor Public Library
  • Carrabassett Public Library
  • Farnsworth Art Museum
  • Lewiston Public Library
  • Maine Maritime Museum