| Golden Hills Landscape INC | Alfonso Alvarado Rodriguez | — | (925) 434 7000 | Windows, patio, painters | Bay Point · Contra Costa County | — | — |
| Golden Home Access | Nicholas Joseph Haschka | kevin@goldenhomeaccess.com | (239) 896 4128 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Golden Key Home Improvement | Golden Key Home Improvement | — | (925) 332 8649 | GC, remodel, ADU | Oakley · Contra Costa County | — | — |
| Golden Oak Construction | William George Nist | — | (925) 382 8213 | GC, remodel, ADU | Clayton · Contra Costa County | — | — |
| Golden Oaks Construction Co INC | Steven Charles Ford | — | (925) 382 9137 | GC, remodel, ADU | Byron · Contra Costa County | — | — |
| Golden One Plumbing INC | Jesus Francisco Sandoval | — | (510) 932 5746 | Other | Antioch · Contra Costa County | — | — |
| Golden Pacific Works INC | Said Tamim Barez | — | (310) 595 0556 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Golden Rain Foundation Of Walnut Creek | Clayton Reese Clark | — | (925) 988 7600 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Golden Ridge Roofing INC | Ambriz Saul Viveros | — | (925) 219 5354 | Other roofers | Oakley · Contra Costa County | — | — |
| Golden Rock Construction INC | Gyoung Min Lee | — | (510) 759 4389 | GC, remodel, ADU | San Ramon · Contra Costa County | — | — |
| Golden Seal General Construction | Bill Cheong Fok | — | (415) 317 7777 | GC, remodel, ADU | El Cerrito · Contra Costa County | — | — |
| Golden Space Construction | Eleni Pedro Cardoso Neto | — | (510) 999 0102 | GC, remodel, ADU | El Sobrante · Contra Costa County | — | — |
| Golden Star Roofing INC | Ambriz Saul Viveros | — | (925) 219 5354 | Other roofers | Oakley · Contra Costa County | — | — |
| Golden State Builder | Leonardo Israel Gutierrez | — | (925) 775 9245 | GC, remodel, ADU | Brentwood · Contra Costa County | — | — |
| Golden State Builders Group INC | Ben Leyzer Strashko | — | (925) 323 5130 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Golden State Contract Flooring INC | Shaylen Allyn Hansen | — | (925) 687 4510 | Other | Concord · Contra Costa County | — | — |
| Golden State Contractors Co | Michael Jin-hae Suh | — | (925) 676 7703 | Other roofers | Concord · Contra Costa County | — | — |
| Golden State Electric Group INC | Riazati Kesheh Afshin | — | (510) 755 6295 | Electricians | Martinez · Contra Costa County | — | — |
| Golden State Electrical Construction LLC | Jared Monte Mckinney | — | (925) 428 2471 | Electricians | Discovery Bay · Contra Costa County | — | — |
| Golden State Garage Doors & Gates INC | Gilad Manzura | — | (510) 631 9969 | Other | Lafayette · Contra Costa County | — | — |
| Golden State Seismic & Structural INC | Brian Louis Bouchard | — | (510) 706 9170 | GC, remodel, ADU | Antioch · Contra Costa County | — | — |
| Golden State Steel And Stair INC | Douglas Allen Boyum | — | (510) 376 0290 | Other | Richmond · Contra Costa County | — | — |
| Golden State Wlc INC | Antonio Mauricio Gutierrez | — | (925) 550 1251 | GC, remodel, ADU | Brentwood · Contra Costa County | — | — |
| Golden Stone Pavers | Golden Stone Pavers | — | (925) 825 7452 | Windows, patio, painters | Concord · Contra Costa County | — | — |
| Golden Thread Landscaping LLC | Jordan Michael Desimone | — | (530) 613 9585 | Windows, patio, painters | Moraga · Contra Costa County | — | — |
| Goldenline General Construction INC | Jesus Eduardo Murillo Chinas | — | (925) 989 8673 | GC, remodel, ADU | Oakley · Contra Costa County | — | — |
| Gomez Elite Building | Gomez Elite Building | — | (510) 313 8771 | GC, remodel, ADU | San Pablo · Contra Costa County | — | — |
| Gonzalez Flooring | Gonzalez Flooring | — | (925) 303 5270 | Other | Antioch · Contra Costa County | — | — |
| Gonzalez Go Plumbing | Gonzalez Go Plumbing | — | (415) 521 9133 | Other | San Pablo · Contra Costa County | — | — |
| Gonzalez Heating & AC | Gonzalez Heating & AC | — | (925) 488 7897 | HVAC | Antioch · Contra Costa County | — | — |
| Gonzalez Landscaping | Gonzalez Landscaping | — | (510) 303 6474 | Windows, patio, painters | Richmond · Contra Costa County | — | — |
| Gonzalez Painting Liquid Culture | Gonzalez Painting Liquid Culture | — | (510) 243 5672 | Windows, patio, painters | San Pablo · Contra Costa County | — | — |
| Gonzalez Welding Mobile | Gonzalez Welding Mobile | — | (925) 550 6273 | Other | Brentwood · Contra Costa County | — | — |
| Gonzalez Yard Care | Gonzalez Yard Care | — | (925) 239 9058 | Windows, patio, painters | Pittsburg · Contra Costa County | — | — |
| Goodale Restoration | Goodale Restoration | — | (925) 957 6306 | GC, remodel, ADU | Martinez · Contra Costa County | — | — |
| Gordon & Sons | Gordon & Sons | — | (925) 238 4252 | Other | Antioch · Contra Costa County | — | — |
| Gordon N Ball INC | David Jeffrey Gray | — | (925) 838 5675 | Other | Walnut Creek · Contra Costa County | — | — |
| Gordon Reese Design Build | Gordon Braman Iii Reese | — | (925) 885 3770 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Got Rat Construction INC | Wilfredo Ricardo Iparraguirre | — | (925) 357 7545 | GC, remodel, ADU | Pittsburg · Contra Costa County | — | — |
| Got Watts Electric Solar & HVAC | Jeremy Lee Carlock | — | (925) 421 0411 | HVAC | Pleasant Hill · Contra Costa County | — | — |