An experienced team under a new roof.

GMH Builders is a young company with a highly experienced team.  Our wealth of knowledge comes with delivering years of exceptional service. As operators of a young firm, we are quick-thinking and have a strong entrepreneurial spirit. With every project we are awarded, our clients experience a team of dedicated people who know how to work in fast-paced environments, cut through red tape, and make decisions that keep our client’s projects moving.


Our co-founders continue to pave the way with over 60 years of experience and over $500 million in construction work directly managed. 




Seth Maze

CO-Founder, CEO

Seth has twenty (20) years of collective industry experience working on projects ranging in value and complexity totaling nearly $1 Billion. He has worked as a part time Carpenter during his educational years followed by more than thirteen (13) years of construction management experience. Through this experience, Seth has developed a strong background in construction methods, personnel management, field supervision, scheduling and coordination, estimating, constructibility, value engineering, contracting, and cost control. Seth has a Bachelors of Science in Construction Management from California State University, Chico. He has accreditations with the USGBC as a LEED AP, BD+C, OSHA 30 Hour, and First Aid Certified.


JOSH Grigg


Josh has nineteen (19) years of construction experience. A second-generation contractor, Josh has worked in all facets of construction. For the last thirteen (13) years Josh has been a successfully managing projects up to $40 MM in value. Josh specializes in design-build and historic re-use/remodel projects. His easy-going nature and clear communication make him a favorite with clients.


Dan Hannan


Dan has been building the north bay for over (30) years. He is well known for a strong work ethic and professional attitude while constructing some of the North Bay’s most significant projects. Dan’s communication skills and leadership abilities greatly enhance problem solving during construction. He has worked in the construction industry for three decades and has a strong background in planning, coordination, scheduling and supervising. Dan is also known for excellent quality control and jobsite safety. Dan’s projects have a history of being completed within budget and on time.