Masterlyne Corporation is a roofing and exterior contractor in San Diego's College Area, headquartered at 7364 El Cajon Boulevard in the 92115 ZIP east of SDSU. Founded in 2009, the company holds CSLB #1121839 (A — General Engineering), CSLB #935106 (B — General Building), and a C-33 Painting and Decorating classification, giving it multi-trade authority on residential envelope projects. The management team behind parent company Westernlyne Corporation has carried active California contractor licensing since 1990, and the crew holds factory-trained certification for roofing, window, and paint product installation that parallels the HVAC envelope work Fabulous Homes Heating & Air runs during attic-access re-roofing in College Area. Roof replacements use Owens Corning TruDefinition Duration shingles among other manufacturer lines. El Cajon Boulevard's commercial and residential mix keeps the company within San Diego's densest re-roofing corridor, where flat-roof apartment conversions and pitched-roof tear-offs run concurrently on adjacent blocks. Exterior coating projects feature Tex-Cote Coolwall application — a reflective elastomeric finish engineered to reduce surface temperature on stucco and masonry facades. Solar panel removal and reinstallation is bundled into roof replacement jobs rather than scheduled as a separate mobilization. Window installation rounds out the building-envelope scope, covering vinyl, aluminum, and composite frame systems in the same residential corridor where Newman Windows and Doors handles dedicated window projects in Grantville. Gutter fabrication — including seamless aluminum runs — is completed on-site during the roofing phase. BuildZoom ranks the company at 95 out of 120, placing it in the top 22 percent of California's 336,000-plus contractors based on permit history, license standing, and bond verification.