Family-owned and operated, Gannon Construction Company is a full-service general contractor serving Marin, Sonoma, Napa, + San Francisco counties for 20+ years. Residential Custom Homes, Remodels, Additions, ADUs GCC is primarily a residential general contractor. The types of residential projects we thrive on are custom homes, remodels, additions, ADUs,
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580 Irwin St, San Rafael, California 94901
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