| Get It Tech | Peter Yi | — | (925) 291 4520 | Other | Concord · Contra Costa County | — | — |
| Getchman Builders | Getchman Builders | contactus@getchmanbuilders.com | (925) 628 1116 | GC, remodel, ADU | Martinez · Contra Costa County | — | — |
| Gft Legacy Holdings LLC | Gregg Adam Drake | — | (925) 820 2202 | Other | San Ramon · Contra Costa County | — | — |
| Gg General Contractor INC | Gregory Frank Sperow | — | (925) 914 7016 | GC, remodel, ADU | Pittsburg · Contra Costa County | — | — |
| Gh Painting | Gh Painting | info@ghpainting.com | (408) 386 3038 | Windows, patio, painters | Pleasant Hill · Contra Costa County | — | — |
| Ghd Services INC | Derek Douglas Mcbean | — | (925) 849 1000 | Other | Concord · Contra Costa County | — | — |
| Ghi Design & Build INC | Dean William Henninger | greenhomeimprovments@gmail.com | (415) 465 4447 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Ghs Landscaping INC | Danilo Batista Carrijo | — | (510) 672 9587 | Windows, patio, painters | El Sobrante · Contra Costa County | — | — |
| Gi Rednic Construction | Grigore Ioan Rednic | — | (925) 726 5835 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Gianni Construction | Anthony Randall Gianni | — | (925) 383 5295 | GC, remodel, ADU | Clayton · Contra Costa County | — | — |
| Gibson Development | Gibson Development | — | (925) 858 3167 | Windows, patio, painters | Danville · Contra Costa County | — | — |
| Gideon Megiddo Freeman | Gideon Megiddo Freeman | — | (510) 520 1166 | Windows, patio, painters | Martinez · Contra Costa County | — | — |
| Gidon Garibov | Gidon Garibov | — | (925) 727 7414 | Other | Concord · Contra Costa County | — | — |
| Gil's Carpets | Gil's Carpets | — | (925) 685 1818 | Other | Martinez · Contra Costa County | — | — |
| Gil's Plumbing | Gil's Plumbing | — | (925) 250 5027 | Other | Danville · Contra Costa County | — | — |
| Gilbane Federal | Eric Allen Munro | — | (925) 946 3100 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Gilbane Federal Jv | Building Company Gilbane | — | (925) 946 3160 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Gilbert's Tree Services | Minda Orlando Nanez | — | (510) 701 2514 | Tree | Concord · Contra Costa County | — | — |
| Gildo's General Construction | Efren Neri Jr Gildo | — | (925) 755 6585 | GC, remodel, ADU | Antioch · Contra Costa County | — | — |
| Gilman Construction | Jason Alexis Privat-gilman | — | (510) 604 0899 | GC, remodel, ADU | Lafayette · Contra Costa County | — | — |
| Gils Garage Doors And Gates | Rivka Chaya Steinberg | — | (925) 322 2210 | Other | Walnut Creek · Contra Costa County | — | — |
| Gim Builder | Bekiri Agim | — | (510) 688 4312 | GC, remodel, ADU | Martinez · Contra Costa County | — | — |
| Gingrich By Design | Gingrich By Design | — | (510) 406 9766 | GC, remodel, ADU | Martinez · Contra Costa County | — | — |
| Gipson Construction LLC | Elan Howell Gipson | — | (925) 787 0131 | Electricians | Martinez · Contra Costa County | — | — |
| Giron Construction Company | Bruce Alvin Jr Giron | — | (925) 322 0566 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Githens Construction | Russell Lawrence Githens | — | (925) 550 8583 | GC, remodel, ADU | Martinez · Contra Costa County | — | — |
| Gladiator Construction | Andy George Vasiloudis | — | (415) 424 2226 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Glass Max | Glass Max | — | (415) 686 4621 | Windows, patio, painters | Concord · Contra Costa County | — | — |
| Glass Tek | Veasna Chamroeun Ith | judy@lianshengglass.com | (415) 994 5661 | Windows, patio, painters | Antioch · Contra Costa County | — | — |
| Glassburn Construction | Gary Dean Ii Glassburn | glassburn.construction.inc@gmail.com | (925) 366 5230 | GC, remodel, ADU | Bethel Island · Contra Costa County | — | — |
| Glazz Guyz | Daniel Mendoza | — | (510) 812 8702 | Windows, patio, painters | Richmond · Contra Costa County | — | — |
| Gleason & Tankard | Michael Richard Gleason | — | (510) 385 4046 | GC, remodel, ADU | Richmond · Contra Costa County | — | — |
| Glen Salling Electrical Maintenance | Glen Lawrence Salling | — | (925) 383 2055 | Electricians | Lafayette · Contra Costa County | — | — |
| Glenmoore Construction Company INC | Larry Braxton Dent | — | (925) 680 7979 | GC, remodel, ADU | Pleasant Hill · Contra Costa County | — | — |
| Glenn Allen Hardwood Floors | Glenn Allen Hardwood Floors | — | (925) 383 6596 | Other | Concord · Contra Costa County | — | — |
| Glenn Ronald Taylor | Glenn Ronald Taylor | — | (510) 236 2919 | GC, remodel, ADU | Richmond · Contra Costa County | — | — |
| Global Comfort Heating & Air | Global Comfort Heating & Air | — | (925) 250 1174 | HVAC | Concord · Contra Costa County | — | — |
| Global Master Tech | Global Master Tech | %20info@globalmastertech.com | (510) 706 5989 | Other | San Ramon · Contra Costa County | — | — |
| Glosage Engineering INC | Luis Armando Guzman Cornejo | — | (510) 815 4505 | Other | Richmond · Contra Costa County | — | — |
| Glv Contractors INC | Raphael Raul Baylon Bartolome | — | (510) 901 9335 | GC, remodel, ADU | Martinez · Contra Costa County | — | — |