| Glz Martin Construction INC | Juan Martin Gonzalez | — | (925) 726 9027 | GC, remodel, ADU | Pittsburg · Contra Costa County | — | — |
| Gm Irrigation Pro's | Gm Irrigation Pro's | — | (510) 685 2266 | Windows, patio, painters | Martinez · Contra Costa County | — | — |
| Gmb Construction | Matthew Jake Mroz | — | (650) 888 8752 | GC, remodel, ADU | Lafayette · Contra Costa County | — | — |
| Gmc Landscape | Janaii Ileen Trejo | — | (510) 815 3809 | Windows, patio, painters | Antioch · Contra Costa County | — | — |
| Gns General Construction INC | Jose Roberto Saucedo Estupinan | gnsconstructionsau23@gmail.com | (925) 428 8177 | GC, remodel, ADU | Antioch · Contra Costa County | — | — |
| Go Beyond Builders INC | Mark James Jr Mckinley | — | (219) 262 4133 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Go Green Cleaning & Construction | Nicholas Vincent Ciano | — | (925) 518 9386 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Go Securities | Go Securities | — | (925) 383 3644 | Other | Martinez · Contra Costa County | — | — |
| Goat Construction Services | Wuili Fernando Martinez Rodriguez | — | (669) 317 5215 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Goat Glass | Goat Glass | — | (925) 354 5395 | Windows, patio, painters | Brentwood · Contra Costa County | — | — |
| Gold Coast Pipelines INC | David Thomas Seeno | — | (925) 483 2589 | Other | Pleasant Hill · Contra Costa County | — | — |
| Gold Coast Refrigeration Service | Jason Daniel Fletcher | — | (925) 354 0858 | HVAC | Brentwood · Contra Costa County | — | — |
| Gold Medallion Commercial Builders | Jeffrey Scott Zeliger | — | (925) 933 9388 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Gold Phase Electric | Aaron Tyler Spiteri | goldphaseelectric@gmail.com | (650) 796 5582 | Electricians | San Ramon · Contra Costa County | — | — |
| Gold Remodeling INC | Daniel Yosef Goldstein | — | (925) 399 2459 | GC, remodel, ADU | Lafayette · Contra Costa County | — | — |
| Gold Rush Construction | Rudolph Charles Trautner | goldrushcnd@aol.com | (925) 356 1885 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Gold Star General Builders INC | Eric Hurtado | — | (925) 437 0255 | GC, remodel, ADU | Oakley · Contra Costa County | — | — |
| Gold Star Pro Painters INC | Rolando Alberto Sr Guerra Avila | — | (415) 756 7520 | Windows, patio, painters | Richmond · Contra Costa County | — | — |
| Golden Bay Construction & Remodel | Sahagun Gutierrez Emmanuel | — | (415) 859 8907 | GC, remodel, ADU | Richmond · Contra Costa County | — | — |
| Golden Bay Foundation Builders INC | Aleksandra Arsenic | info@goldenbayfoundationbuilders.com | (925) 812-5612 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Golden Bay Remodeling INC | Yenifer Estefanni Amaya Pacas | — | (925) 305 6537 | GC, remodel, ADU | Pittsburg · Contra Costa County | — | — |
| Golden Bay Trans INC | Luis Gomez Robles | — | (707) 333 8706 | Other | Richmond · Contra Costa County | — | — |
| Golden Bear Landscape Services | John Ii Piper | — | (925) 522 1872 | Windows, patio, painters | Walnut Creek · Contra Costa County | — | — |
| Golden Bear Pool Service INC | Darren Patrick Miller | — | (925) 210 1393 | Pool | Alamo · Contra Costa County | — | — |
| Golden City Builder INC | Martinez Javier Dominguez | — | (925) 497 7092 | Other | Oakley · Contra Costa County | — | — |
| Golden Coast Fire Protection INC | Guillermo Arturo Lozano | — | (925) 206 1919 | Other | Pittsburg · Contra Costa County | — | — |
| Golden Colors Painting INC | Guerra Ramirez Rolando | info@indiantypefoundry.com | (415) 695 4074 | Windows, patio, painters | Richmond · Contra Costa County | — | — |
| Golden Earth And Stone Landscaping | Golden Earth And Stone Landscaping | — | (510) 778 8558 | Windows, patio, painters | Richmond · Contra Costa County | — | — |
| Golden Firefly Endeavours INC DBA Rock Waterfire / Custom Mastic | Jason Phillip Dodds | — | (925) 918 0840 | Windows, patio, painters | Brentwood · Contra Costa County | — | — |
| Golden Gate Electric | Lara Contreras Carlos | — | (415) 233 5821 | Electricians | San Pablo · Contra Costa County | — | — |
| Golden Gate Electrical Automation | Matthew Alexander Dickey | — | (925) 705 0873 | Electricians | Brentwood · Contra Costa County | — | — |
| Golden Gate Fence | Damir Rafikovich Akhunov | — | (925) 768 8755 | Other | Concord · Contra Costa County | — | — |
| Golden Gate Flooring Co | Herson Fabricio Lopez Gonzalez | — | (415) 261 2710 | Other | Richmond · Contra Costa County | — | — |
| Golden Gate Overhead Garage Door Co | Timothy Ross Humann | — | (510) 222 5128 | Other | Port Costa · Contra Costa County | — | — |
| Golden Gate Plumbing | Golden Gate Plumbing | — | (510) 990 7179 | Other | El Cerrito · Contra Costa County | — | — |
| Golden Gate Pool Co | Christian Daniel Hickman | — | (925) 470 0262 | Pool | Antioch · Contra Costa County | — | — |
| Golden Gate Sign Company Incorporated | Alan Anthony Bartizal | — | (925) 771 6300 | Other | Concord · Contra Costa County | — | — |
| Golden Grove Roofing And Construction | Olga Dotter | — | (925) 272 8248 | Other roofers | Walnut Creek · Contra Costa County | — | — |
| Golden Heights Remodeling INC DBA Golden Heights Roofing | Nicholas Raymond Garcia | — | (925) 332 5154 | Other roofers | Concord · Contra Costa County | — | — |
| Golden Heights Roofing | Golden Heights Roofing | — | (925) 369-4146 | Other roofers | Concord · Contra Costa County | — | — |