| Gotcha Covered Flooring INC | Melquiades Islas | — | (925) 584 0083 | Other | Oakley · Contra Costa County | — | — |
| Gould Construction | Bret Gordon Gould | — | (510) 612 7497 | GC, remodel, ADU | El Sobrante · Contra Costa County | — | — |
| Gourley Construction | Douglas Wayne Gourley | — | (510) 243 7445 | GC, remodel, ADU | El Sobrante · Contra Costa County | — | — |
| Govea's Painting | Govea's Painting | — | (831) 713 0595 | GC, remodel, ADU | Pinole · Contra Costa County | — | — |
| Gpi Construction | Frederick Thomas Gabriel | — | (510) 685 3569 | GC, remodel, ADU | Orinda · Contra Costa County | — | — |
| Gr Innovative Builders INC | Gilberto Rivera Rodriguez | — | (510) 617 8559 | GC, remodel, ADU | Hercules · Contra Costa County | — | — |
| Grace Construction | Rosa Haydee Hodge | — | (925) 687 9977 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Grace Heating And Air INC | Derrick Allen Easton | — | (925) 453 1315 | HVAC | Walnut Creek · Contra Costa County | — | — |
| Grade A Floor Coverings | Grade A Floor Coverings | — | (925) 550 3889 | Other | Martinez · Contra Costa County | — | — |
| Grady's Chimney Sweep & Serv | Grady's Chimney Sweep & Serv | — | (925) 855 0504 | Other | Concord · Contra Costa County | — | — |
| Graham Communcations International INC | Thomas Bernardine Graham | — | (925) 833 0522 | Other | San Ramon · Contra Costa County | — | — |
| Granada Electric INC | Zamata-gutierrez David | donate@opencart.com | (408) 772 1976 | Electricians | Walnut Creek · Contra Costa County | — | — |
| Granados Concrete INC | Abraham Flores Granados | — | (415) 574 1554 | Other | El Sobrante · Contra Costa County | — | — |
| Grant Scott And Snowden INC | Kymm Lamont Snowden | — | (925) 385 8811 | GC, remodel, ADU | Lafayette · Contra Costa County | — | — |
| Grassworks Landscape INC | Mendez Abraham Juarez | — | (925) 521 4613 | Windows, patio, painters | Concord · Contra Costa County | — | — |
| Grateful Decor | Grateful Decor | — | (925) 323 0340 | GC, remodel, ADU | Pleasant Hill · Contra Costa County | — | — |
| Grats Decor Interior Design & Build INC | Yuriy A Moliboga | — | (415) 593 7323 | GC, remodel, ADU | Clayton · Contra Costa County | — | — |
| Graves 6 INC DBA Preferred Plumbing & Drain | Thomas Martin Dollarhide | — | (925) 677 0900 | Other | Concord · Contra Costa County | — | — |
| Gray Line Construction LLC | Jonathan David Medina | — | (808) 457 9782 | GC, remodel, ADU | Pleasant Hill · Contra Costa County | — | — |
| Gray Matter Construction | Peter Tatsumi Gray | — | (510) 703 7383 | GC, remodel, ADU | Richmond · Contra Costa County | — | — |
| Grayson | Timothy Scott Grayson | vendors@template.product | (925) 595 5014 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Great Britton Construction | Tilly Winks Britton | — | (510) 502 6588 | GC, remodel, ADU | Antioch · Contra Costa County | — | — |
| Great Dane Construction INC | Chris Edwin Persing | hello@rfuenzalida.com | (925) 705 1786 | GC, remodel, ADU | Pittsburg · Contra Costa County | — | — |
| Great Green Gardening Service | Adam Robert Suval | — | (415) 948 3700 | Windows, patio, painters | Richmond · Contra Costa County | — | — |
| Green Air Heating And Air Conditioning INC | Nicholas Charles Donzelli | — | (925) 284 7336 | HVAC | Concord · Contra Costa County | — | — |
| Green Bay Remodeling INC | Michael Perry Yarom | — | (855) 889 9963 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Green Construction | Tsedev Enkhbileg | — | (510) 703 3395 | GC, remodel, ADU | El Cerrito · Contra Costa County | — | — |
| Green Eagle Plumbing | Green Eagle Plumbing | info@greeneagleplumbing.com | (510) 928 0759 | Other | Kensington · Contra Costa County | — | — |
| Green Electrical Sf LLC | Green Ricky | ricky@greenelectricalsf.com | (415) 823 8734 | Electricians | Orinda · Contra Costa County | — | — |
| Green Electrical Tech | Jorge Alberto Navarrete | — | (510) 712 7866 | Electricians | Richmond · Contra Costa County | — | — |
| Green Empire Builder INC | Nadali Nick Sadeghi | — | (818) 288 6060 | Electricians | Concord · Contra Costa County | — | — |
| Green Group Roofing | Antonio Tapia | — | (925) 510 4640 | Other roofers | Concord · Contra Costa County | — | — |
| Green Hill Painting | Green Hill Painting | — | (925) 642 4333 | Windows, patio, painters | Pittsburg · Contra Costa County | — | — |
| Green Infrastructure And Environmental INC | Timothy Evan Pessin | — | (925) 807 9469 | Electricians | Danville · Contra Costa County | — | — |
| Green Lane Tree Service INC | Yina Yanet Alva Sanchez | — | (925) 705 2100 | Tree | Brentwood · Contra Costa County | — | — |
| Green Lynx LLC | Marc Logan | — | (925) 708 2776 | Windows, patio, painters | Walnut Creek · Contra Costa County | — | — |
| Green Meadows Landscape | Green Meadows Landscape | — | (925) 361 8431 | Windows, patio, painters | San Ramon · Contra Costa County | — | — |
| Green T Energy Electrical INC | Tarik Terki | — | (415) 640 3241 | Electricians | Richmond · Contra Costa County | — | — |
| Green Team Landscape & Maintenance INC | Fred Seddiqi | — | (925) 681 1491 | Windows, patio, painters | Pacheco · Contra Costa County | — | — |
| Green Tom Landscaping | Green Tom Landscaping | — | (510) 220 7043 | Windows, patio, painters | San Pablo · Contra Costa County | — | — |