Zone 4 Construction, Inc. is a full-service general contractor with offices centrally located in South San Francisco, on the San Mateo Peninsula. We specialize in providing quality commercial construction and management services to our clients throughout the greater Bay Area and Northern California. Our projects include corporate office interiors, electrical, miscellaneous carpentry and demolition services. We commit the highest level of time and resources to each and every job, and with our combined years of business experience, never compromise on our standard of excellence and safety.