Bay Modular

Bay Modular is a prefab manufacturer based in Lathrop, California, specializing in accessory dwelling units and backyard studios built from modified shipping containers and serving the San Francisco Bay Area. Their Solo product line offers expandable modular configurations ranging from studios to two-bedroom units, with all-electric systems, premium insulation, and optional solar packages engineered for California compliance. Bay Modular operates as a permitted manufacturer under California's HCD license and provides a fully turnkey service covering site preparation, design, permitting, and utilities connection, eliminating the typical complexity of new construction. Pre-approved designs streamline local permitting requirements, while customizable interior and exterior finishes allow homeowners to personalize their unit. The company's sustainability focus is reflected in its use of repurposed containers, materials ordered to specification to minimize waste, and a modern design sensibility that prioritizes affordability alongside quality.