| Gregory M Clark Construction | Gregory Michael Clark | — | (415) 665 6500 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| Greish Painting & Wallpaper Hanging | Greish Painting & Wallpaper Hanging | — | (707) 539 1127 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Grey Enterprises INC | Edgar Enrique Flores Hernandez | — | (707) 235 0261 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Grey Wolf Painting LLC | Julian Joseph Maese | julian@greywolfpainting.com | (415) 842 9653 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Greystone West Company | Kathryn Jane Lee | — | (707) 933 0624 | GC, remodel, ADU | Sonoma · Sonoma County | — | — |
| Grice INC | David John Grice | — | (949) 212 3441 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Grid Titans LLC | Naaman Kingsley Hagman | sales@gridtitans.com | (415) 286 5695 | Electricians | Petaluma · Sonoma County | — | — |
| Gridsync Electrical | Aren Mulbry Page | — | (707) 338 2405 | Electricians | Petaluma · Sonoma County | — | — |
| Griffiths Construction | Robert Michael Griffiths | — | (415) 572 6278 | Electricians | Sonoma · Sonoma County | — | — |
| Grima Tile And Stone INC | Vincent Jr Grima | — | (707) 588 1887 | Other | Cotati · Sonoma County | — | — |
| Grogan & Sons Construction Co | Ronald William Grogan | — | (707) 889 0061 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Grooms Construction | Travis Wade Grooms | groomsconstruction707@gmail.com | (707) 495 5229 | GC, remodel, ADU | Windsor · Sonoma County | — | — |
| Gross Enterprises INC | Jeffery Lee Gross | — | (707) 303 7925 | GC, remodel, ADU | Rohnert Park · Sonoma County | — | — |
| Grossi James Construction | James Joseph Grossi | — | (707) 225 1384 | Other | Sonoma · Sonoma County | — | — |
| Ground Hog Construction | Richard Allen Thill | — | (707) 823 3123 | Other | Sebastopol · Sonoma County | — | — |
| Grounded Core | Grounded Core | — | (707) 478 8555 | Electricians | Sebastopol · Sonoma County | — | — |
| Grounded Excavation & Trucking INC | Michael Eugene Nunley | — | (707) 975 2096 | Other | Penngrove · Sonoma County | — | — |
| Groundswell Management INC | Robert John Iii Biederman | info@groundswellmgmt.com | (707) 859 0304 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Groves Residential Framing | Groves Residential Framing | — | (707) 295 0069 | Other | Forestville · Sonoma County | — | — |
| Grupe HVAC | Grupe HVAC | — | (707) 765 2663 | HVAC | Petaluma · Sonoma County | — | — |
| Gtz Fences | Oscar Alejandro Gutierrez Rios | — | (707) 338 6626 | Other | Santa Rosa · Sonoma County | — | — |
| Gtz Roofing | Raul Pena Gutierrez | — | (707) 774 1839 | Other roofers | Petaluma · Sonoma County | — | — |
| Guardian Roofing LLC | John Joseph Dondero | guardianroofllc@gmail.com | (707) 843 3526 | Other roofers | Santa Rosa · Sonoma County | — | — |
| Gudinos Plumbing | Gudinos Plumbing | — | (415) 407 0584 | Other | Rohnert Park · Sonoma County | — | — |
| Guerra Construction LLC | Jeffrey Roger Guerra | — | (415) 652 3641 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Guerra Electric & Construction INC | Sanjeev Acharya | — | (707) 889 0762 | HVAC | Santa Rosa · Sonoma County | — | — |
| Gugel / Today Painting & Decorating INC | Karen Marie Gugel | — | (707) 762 4406 | Windows, patio, painters | Penngrove · Sonoma County | — | — |
| Gunderson Painting | Gunderson Painting | — | (707) 338 9957 | Windows, patio, painters | Sonoma · Sonoma County | — | — |
| Guptill Handyman Services | Gabriel Joseph Guptill | — | (707) 513 5017 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Gus Golobe Paving | Gus Golobe Paving | — | (707) 481 1589 | Other | Sebastopol · Sonoma County | — | — |
| Gutierrez Construction | Gutierrez Gonzalez Angel | — | (707) 322 1969 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Gutierrez R Construction INC | Gutierrez Raul | — | (707) 478 5166 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Guy's Fencing INC | Abigael Cisneros Aranda | — | (707) 836 9701 | Other | Windsor · Sonoma County | — | — |
| Guys Yard Design INC | Guy Junior Aranda | — | (707) 887 3489 | Windows, patio, painters | Windsor · Sonoma County | — | — |
| Guzman Flooring Specialist | Guzman Flooring Specialist | — | (707) 477 2297 | Other | Boyes Hot Springs · Sonoma County | — | — |
| Guzman Painting | Guzman Painting | — | (707) 694 3028 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Gwin Electric | Christopher Leslie Gwin | — | (707) 888 1180 | Electricians | Windsor · Sonoma County | — | — |
| H & B Builders | H & B Builders | — | (707) 338 3693 | GC, remodel, ADU | Rohnert Park · Sonoma County | — | — |
| H & R Building Services INC | Randy Lane Tavenner | — | (707) 792 5060 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| H Bear Builders INC | Paredes Rodolfo Hernandez | — | (707) 623 0514 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |