OnePhase ADU Contractor

ONEPHASE General Contractor is a licensed and insured construction company based in San Diego, California, specializing in affordable and high-quality Accessory Dwelling Unit (ADU) construction. With decades of experience, ONEPHASE provides turnkey ADU solutions that address San Diego's housing shortage by helping homeowners unlock the full potential of their properties.

One Phase General ADU Contractor is a premier licensed and insured construction enterprise based in San Diego, California, with a specialized focus on the design and development of accessory dwelling units (ADUs). One Phase was founded on the belief that every homeowner should have access to affordable, high-quality living solutions that both enhance property value and address the region’s critical housing needs.