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Residential | Commercial & PUBLIC WORKS | Site Work 

Gannon Construction Logo

Gannon Construction Company is a family-owned, full-service general contractor with over 25 years of experience serving the Greater North Bay Area.

Residential Construction

Custom Homes • Remodels • Additions • ADUs

Gannon Construction Company specializes in high-end residential projects throughout Marin County, including custom homes, remodels, additions, and ADUs. From full ground-up builds to kitchen and bathroom renovations, we bring precision, craftsmanship, and care to every detail. As demand grows for flexible living spaces, additions and ADUs have become smart, value-adding solutions—seamlessly integrated into your home.  

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Commercial & Public Works

Restaurants • Schools • Tenant Improvements • Public Buildings

In addition to custom homes, Gannon Construction delivers high-quality light commercial projects throughout Marin County. Our portfolio includes restaurants, offices, schools, and public buildings—each built with efficiency, code compliance, and purpose-driven design in mind. We bring the same craftsmanship and project management excellence to commercial spaces as we do to our residential work.

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Site Work

Retaining Walls • Driveways • Drainage • Septic

Gannon Construction holds both Class B (General Building) and Class A (General Engineering) licenses, giving us the ability to handle complex site work that many residential contractors cannot. Our services include retaining walls, drainage systems, grading, driveways, slope stabilization, and utility infrastructure. Whether preparing raw land or solving challenging site conditions, we bring the expertise and equipment to manage your project from the ground up—with precision and efficiency.

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Testimonials

"The Villa Ladera is a classic Italian villa in Sausalito, originally built by the Gianini family that founded the Bank of America. It is now a small condominium with 7 families. We have used Brian Gannon's construction company for several projects, large and small. His work is always first class, and if he needs to bring in specialists, they are also experts at what they do. He has won all the projects we have put out to bid, due to his approach to our issues and his competitive pricing, and prompt responses. I cannot recommend Brian and his company any higher or with more confidence in the job they will perform."

— Philip Durbrow, President, Villa Ladera Homeowners

"Brian Gannon has worked for us for over 20 years and has always been honest and fair as well as being an excellent problem solver. Brian has been able to find and fix problems that others have missed as well as advising when expensive work is unnecessary. We recommend him enthusiastically especially for complex construction jobs."

— Wayne Herkness

"Brian Gannon and his team handled my move from Larkspur to Berkeley in the Fall of 2014. The move required extensive remodeling since my previous home was much larger with many built-ins. The team worked seamlessly with the designer, building neighbors, and contractors such as the interior designer, installation experts, marble fabricators, carpet and tile providers, plumbers, flooring, painters, and lighting experts. The move went beautifully, promptly, and was effortless for me! I highly recommend him and his colleagues. "

— Suzanne Rubel

"Gannon Construction is the first contractor that I’ve totally trusted and felt comfortable with any decision they have made regarding my house. Their work has exceeded my highest expectations. They do this by constant consulting, briefing me on alternative methods, and extraordinary attention to detail. Brian Gannon is always looking two or three steps ahead of the work and anticipates and corrects issues before they become problems."

— Spencer Adams

"Gannon delivers! Working with Brian Gannon has been an absolute pleasure. Because we are totally pleased with the renovation of our 100 years old house, we intend to have Gannon Construction back for more work on a garage conversion and for updates to our master bedroom and bath.
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Gannon’s attention to detail really paid off, his suggestions were excellent and his subcontractors showed up as scheduled. Any difficulties, all minor, that did arise were dealt with immediately. There was complete accountability and no passing the buck. Read more...

— Mary Farmer, Mike Dowling​