Accessory dwelling unit construction in La Mesa is the primary focus of Johnny General Contractor ADU, operating from Center Drive in the 91942 corridor near Sharp Grossmont Hospital. California's ADU regulations under Senate Bill 9 and Assembly Bill 68 govern setback minimums, height limits, and utility connection requirements, and the permitting workflow runs through consultants like The Permit Pro Consultant for plan-check submittals to the City of La Mesa. The company handles ground-up detached ADUs, garage conversions, and junior ADUs that share plumbing walls with the primary residence. Each project requires independent sewer laterals or shared-lateral agreements coordinated with plumbing contractors such as John Padilla Plumbing, Sewer and Drains for tie-in inspections. Full-scope ADU builds in this zip code typically require Title 24 energy compliance documentation, separate electrical subpanels rated at 100 amps minimum, and CalGreen-mandated water-efficient fixture packages.