ADU San Mateo

ADU San Mateo is a licensed design-build construction company in San Mateo, California, specializing in custom accessory dwelling units (ADUs) across San Mateo and Santa Clara Counties. The company designs and constructs detached ADUs, attached ADUs, and garage conversions, offering turnkey solutions that blend modern efficiency with architectural detail. Serving homeowners seeking additional living space, rental income, or multigenerational living options, ADU San Mateo handles every phase of the project, from initial design and permitting to final construction and delivery. With a perfect 5.00 rating based on client reviews, the company is consistently praised for professionalism, attention to detail, and timely project completion.

Founded by Elie AlChaer, a licensed general contractor with extensive experience on high-value commercial and luxury projects across the Bay Area and Dubai, ADU San Mateo was created to address inefficiencies in residential construction. The company emphasizes transparency, local expertise, and craftsmanship, ensuring each ADU is tailored to the homeowner’s property and goals. Their process integrates architectural insight with practical construction knowledge, streamlining city approvals and paperwork while using quality materials and skilled local crews. Projects range from Spanish Revival-style detached homes with clay-tile roofs and hand-set Moroccan tile niches to modern, newly constructed units and fully converted garages, all built without prefabricated components.

Located at 3 E 3rd Ave Suite 200, the business sits just a short walk from the San Mateo Public Library and Draper University of Heroes, near San Mateo Creek and East 3rd Avenue, placing it within easy reach of downtown San Mateo’s civic and cultural hubs.

ADU San Mateo stands out for its consistent delivery of high-quality, custom-built ADUs with minimal delays and strong client satisfaction. The company is recognized for its deep understanding of Bay Area zoning, reliable project management, and commitment to doing work right the first time, earning it a reputation as a trusted local builder among homeowners seeking dependable, long-term solutions.

As a leader in custom ADU construction in the region, ADU San Mateo exemplifies how thoughtful design and skilled craftsmanship can transform residential living in San Mateo.