Mark Stangl Construction Inc. on San Luis Rey Avenue in Coronado has handled residential and commercial builds across the island and greater San Diego since Mark Stangl earned his general contractor certificate in 1989, following nine years in the San Diego Carpenters Union that began in 1980. The firm's plumbing coordination on new-construction and remodel projects routes through island-based sub-trades including ATL Plumbing & Sewer Line, which handles rough-in, top-out, and final trim phases under Coronado's municipal inspection sequence. Stangl's involvement with Emerald Keepers, the Seabees Memorial Scholarship Association, Coronado Schools, and the Boy Scouts of America reflects a community investment that parallels the firm's four-decade construction presence on Orange Avenue's residential side streets. Homeowners who prefer a single-contract approach to architecture and construction can access design-build capability through complementary island firms such as Nicolls Design Build, which pairs drafting and permitting with general contracting under one scope. High-end residential scopes include engineered-shearwall framing systems, standing-seam metal roofing, and insulated concrete form foundation walls rated to exceed California's Title 24 energy-performance thresholds.