Rock 10 Insurance at 7125 El Cajon Boulevard, Suite 8, in College Area is a San Diego commercial-lines brokerage founded in 2004 by Matthew Kohl with a focus on construction-industry coverage. The agency writes contractors' general liability, workers' compensation, commercial auto, builders' risk, and E&O policies, structuring programs around the risk profiles of general contractors, specialty trades, and subcontractor operations. Rock 10 holds a BBB A+ accreditation and also writes commercial packages for assisted-living facilities, restaurants, and general businesses of all sizes, extending the coverage menu beyond the construction sector. The El Cajon Boulevard office sits in the 92115 ZIP near SDSU, and the agency's contractor-insurance book serves construction firms operating along the Mission Gorge Road and Grantville commercial corridor, including insulation and attic-work contractors at Attic Construction that carry general-liability and workers'-compensation policies through commercial brokers. Rock 10 also represents Nationwide for personal-lines auto, homeowners, and business-owners policies, giving the agency a dual book that covers both the contractor's job-site liability and the owner's personal assets under one brokerage relationship. The agency now operates under the Trucordia brand for its commercial platform while maintaining the Rock 10 name on the El Cajon Boulevard storefront. Electrical and solar contractors — including Lightning Electric in College Area — represent trade-specific risk classes where C-10 license holders need GL limits calibrated to panel-upgrade and rewiring exposures in San Diego's older housing stock. The builders'-risk product covers structures under active construction or renovation, insuring materials, fixtures, and equipment on-site from ground-breaking through certificate-of-occupancy issuance.