Front-Line Fire Protection is a fire sprinkler contractor based in Middleton, Massachusetts. It installs new commercial and residential sprinkler systems, including ADU and NFPA 13D systems, and carries out retrofits and renovations. It also provides quarterly, semi-annual and annual inspections and testing, service and repair, backflow preventer installation, and fire pump and hydrant testing. The firm covers eastern and central Massachusetts and southern New Hampshire, and holds Massachusetts Fire Sprinkler Contractor Licence SC210048.