| Gibson Quality Construction | James Aaron Iii Gibson | — | (707) 391 8760 | GC, remodel, ADU | Ukiah · Mendocino County | — | — |
| Glentzer Electric | Christopher James Glentzer | — | (707) 272 7758 | Electricians | Willits · Mendocino County | — | — |
| Goc Construction & Roofing INC | Oxte Can Genaro | — | (707) 684 0942 | Other roofers | Fort Bragg · Mendocino County | — | — |
| Goeken Construction | Seth Donald Goeken | — | (707) 391 5150 | GC, remodel, ADU | Potter Valley · Mendocino County | — | — |
| Goforth Designs | Goforth Designs | — | (707) 937 3005 | Electricians | Albion · Mendocino County | — | — |
| Golden Forest | Golden Forest | — | (707) 621 3116 | Tree | Redwood Valley · Mendocino County | — | — |
| Gordon W Harry General Contractor | Gordon W Harry General Contractor | — | (707) 884 3085 | GC, remodel, ADU | Gualala · Mendocino County | — | — |
| Gracias Roofing LLC | Jesus Garcia Celso De | — | (707) 272 3679 | Other roofers | Ukiah · Mendocino County | — | — |
| Graham Carson Electric | Graham David Carson | — | (760) 845 2580 | Electricians | Hopland · Mendocino County | — | — |
| Gray Shape Woodworks | Cory Sahifi | — | (707) 391 1585 | GC, remodel, ADU | Ukiah · Mendocino County | — | — |
| Grayson Electric | Philip Michael Grayson | bill@grayson-electric.com | (707) 367 1314 | Electricians | Redwood Valley · Mendocino County | — | — |
| Greene Concrete Const | Greene Concrete Const | — | (707) 489 0275 | Other | Willits · Mendocino County | — | — |
| Greenstone Landscapes LLC | Johan Dersu Henckell | — | (707) 367 7439 | Windows, patio, painters | Willits · Mendocino County | — | — |
| Greenwood Aggregates INC | Robin Sun Bird | — | (707) 895 9155 | Other | Philo · Mendocino County | — | — |
| Greenwood Construction INC | Ryan Patrick Tuomala | — | (707) 489 4466 | GC, remodel, ADU | Fort Bragg · Mendocino County | — | — |
| Greg Andree Painting | Greg Andree Painting | — | (707) 813 8082 | Windows, patio, painters | Albion · Mendocino County | — | — |
| Greg Hoyt Construction INC | Gregory Steven Hoyt | — | (707) 462 6082 | GC, remodel, ADU | Ukiah · Mendocino County | — | — |
| Gregg Simpson Trucking | Gregg Simpson Trucking | — | (707) 468 1654 | Other | Ukiah · Mendocino County | — | — |
| Greggory Stevens | Greggory Stevens | — | (707) 357 0661 | GC, remodel, ADU | Fort Bragg · Mendocino County | — | — |
| Gregory Smith | Gregory Smith | — | (707) 813 0734 | Other | Fort Bragg · Mendocino County | — | — |
| Groff Plumbing LLC | Thomas Edwin Iii Groff | — | (707) 513 9949 | GC, remodel, ADU | Redwood Valley · Mendocino County | — | — |
| Grout Line Tile Design | Grout Line Tile Design | — | (707) 459 7074 | Other | Willits · Mendocino County | — | — |
| Gualala Glass Works | David Alexander Printz | — | (707) 483 9949 | Windows, patio, painters | Gualala · Mendocino County | — | — |
| Guerra Roofing | Israel Perez Guerra | guerraroofing22@yahoo.com | (707) 391 8079 | Other roofers | Ukiah · Mendocino County | — | — |
| Guillermo Arriaza Roofing | Guillermo Chavez Arriaza | — | (707) 964 2138 | Other roofers | Fort Bragg · Mendocino County | — | — |
| Gustavo Medina Painting | Gustavo Medina Painting | — | (707) 684 9608 | Windows, patio, painters | Gualala · Mendocino County | — | — |
| Gwp General Engineering INC | Marco David Aban | — | (707) 272 8793 | Other | Fort Bragg · Mendocino County | — | — |
| H & H Contractors INC | James Gregory Holmes | — | (707) 884 5010 | GC, remodel, ADU | Gualala · Mendocino County | — | — |
| H Bar Resource Management LLC | Steven Keith Hurt | — | (707) 367 4880 | Windows, patio, painters | Willits · Mendocino County | — | — |
| Halstad Plumbing | Halstad Plumbing | — | (707) 391 8615 | Other | Willits · Mendocino County | — | — |
| Happy Sheep Consulting Services | Daniel Chen Yan | — | (707) 621 4860 | GC, remodel, ADU | Ukiah · Mendocino County | — | — |
| Haralampos Bratsis | Haralampos Bratsis | — | (707) 367 3364 | GC, remodel, ADU | Redwood Valley · Mendocino County | — | — |
| Hardy Kuenzl DBA Ies | Hardy Kuenzl DBA Ies | — | (707) 272 4036 | Electricians | Laytonville · Mendocino County | — | — |
| Harney Construction | Andrew Charles Harney | — | (707) 964 6340 | GC, remodel, ADU | Fort Bragg · Mendocino County | — | — |
| Hartwell Construction | Kenneth Walter Powell | — | (415) 987 0847 | GC, remodel, ADU | Fort Bragg · Mendocino County | — | — |
| Hatchet Mountain Construction | Tyler James Swearinger | — | (707) 621 2776 | GC, remodel, ADU | Covelo · Mendocino County | — | — |
| Hawthorne Construction | Michael Dewayne Hawthorne | j.bshs@hotmail.com | (707) 391 2142 | GC, remodel, ADU | Ukiah · Mendocino County | — | — |
| Heart Bar Construction | Russell Bryce Tye | — | (707) 621 4566 | GC, remodel, ADU | Willits · Mendocino County | — | — |
| Hernandez Electric INC | Hernandez Trino | info@hernandezelectric.net | (707) 354 8212 | Electricians | Ukiah · Mendocino County | — | — |
| Hi Star Electric LLC | John David Heister | — | (707) 397 1416 | Electricians | Mendocino · Mendocino County | — | — |