Holding CSLB license #843680 in the B (General Building) and C-7 (Low Voltage Systems) classifications since 2003, Calderon Builders Inc runs commercial construction and low-voltage technology projects from a First Avenue office in Hillcrest. The C-7 Low Voltage classification covers structured cabling, AV, and security, but every commercial tenant improvement also needs a C-10 line-voltage electrician for panel upgrades and teller-line power, which is the parallel scope delivered on neighboring Hillcrest commercial jobs by Eaton Electric. The company is a certified Promethean service provider, which means interactive display installation, AV cabling, and structured cabling on school and corporate projects run through the same company that holds the general building contract. Design-assist participation on commercial ground-up projects pulls the GC into the architect's consultant team early, and Architects Magnus is one of the Hillcrest-based commercial architecture practices whose coordination meetings catch MEP conflicts before the field crew hits them. Emergency response is available for existing commercial clients dealing with water intrusion, vehicle impact, or after-hours break-ins that need board-up and interior restoration. Full branch build-outs for financial institutions including vault work, teller lines, ADA-compliant entries, low-voltage security integration, and phased cutovers so the branch opens on Monday are the most coordinated jobs the firm delivers.