| Glen Ragsdale Underground Associates INC | Glen Eugene Ragsdale | — | (707) 965 3250 | Other | Angwin · Napa County | — | — |
| Glen Zide Construction | Glen Howard Zide | — | (661) 860 4810 | GC, remodel, ADU | St Helena · Napa County | — | — |
| Gnv Plastering Pools | Martinez German Valdez | — | (707) 294 8986 | Pool | Napa · Napa County | — | — |
| Golden Hills Landscape & Design INC | Torres Oscar Bolanos | — | (707) 815 4357 | Windows, patio, painters | Napa · Napa County | — | — |
| Golden Stars Construction | Mario Ibarra Tenorio | — | (415) 504 4599 | GC, remodel, ADU | Napa · Napa County | — | — |
| Goldstar Construction And Real Estate Services | Rico Steven De Benedetti | — | (510) 821 1347 | GC, remodel, ADU | Napa · Napa County | — | — |
| Gomez Landscaping | Gomez Landscaping | — | (707) 287 8704 | Windows, patio, painters | Napa · Napa County | — | — |
| Gonzalez Landscape | Gonzalez Landscape | — | (707) 927 6500 | Windows, patio, painters | Napa · Napa County | — | — |
| Gonzalez Plumbing | Gonzalez Plumbing | — | (707) 774 1156 | Other | Napa · Napa County | — | — |
| Goodman's Mobile Home Repair | Goodman's Mobile Home Repair | — | (707) 346 7633 | Other | Napa · Napa County | — | — |
| Gracy's Painting | Gracy's Painting | — | (707) 384 0132 | Windows, patio, painters | Napa · Napa County | — | — |
| Graham Tile | Graham Tile | — | (970) 846 0040 | Other | Napa · Napa County | — | — |
| Grandview Landscaping Co | Young Il Chun | — | (707) 330 2101 | Windows, patio, painters | Napa · Napa County | — | — |
| Grassi & Associates | Paul Richard Niles | — | (707) 255 3232 | GC, remodel, ADU | Napa · Napa County | — | — |
| Great Northern Construction INC | William Thomas Hyde | — | (707) 251 8321 | GC, remodel, ADU | Napa · Napa County | — | — |
| Green World Construction INC | Samuel Louis Barela | — | (510) 860 1393 | GC, remodel, ADU | American Canyon · Napa County | — | — |
| Greg Park | Greg Park | — | (707) 363 8498 | Other | Napa · Napa County | — | — |
| Gregory L Kearns Plumbing | Gregory L Kearns Plumbing | — | (510) 703 0055 | Other | American Canyon · Napa County | — | — |
| Grid Design Build | Beth Ann Farley | — | (707) 291 8326 | GC, remodel, ADU | Napa · Napa County | — | — |
| Griffin Molinari Building Construction INC | Eamon Patrick Griffin | — | (707) 738 8200 | GC, remodel, ADU | Yountville · Napa County | — | — |
| Grimm Construction Co | Brian Zachery Grimm | — | (707) 815 2553 | GC, remodel, ADU | Napa · Napa County | — | — |
| Grinsell Landscaping | Grinsell Landscaping | — | (707) 254 9743 | Windows, patio, painters | Napa · Napa County | — | — |
| Gudgel Rick DBA Penny Pinching Construction & Remodeling | Rick Alan Gudgel | — | (707) 225 5157 | GC, remodel, ADU | Napa · Napa County | — | — |
| Gus Orozco's Flooring | Gus Orozco's Flooring | — | (707) 363 4883 | Other | Napa · Napa County | — | — |
| Gutierrez Painting | Gutierrez Painting | gutierrez.painting@hotmail.com | (707) 312 0217 | Windows, patio, painters | Calistoga · Napa County | — | — |
| Gw Developing | Gaelon Marcell Watkins | — | (707) 333 6284 | GC, remodel, ADU | American Canyon · Napa County | — | — |
| H & L Construction | Nicholas Lee Hughes | — | (707) 337 3040 | GC, remodel, ADU | Napa · Napa County | — | — |
| H Figueroa Construction INC | Hugo Eleasar Figueroa | — | (707) 637 6683 | GC, remodel, ADU | Napa · Napa County | — | — |
| H2 Builders Construction LLC | Patrick Brian Hemingway | — | (707) 287 6758 | GC, remodel, ADU | Napa · Napa County | — | — |
| H2 Builders INC | Patrick Brian Hemingway | — | (707) 927 5994 | GC, remodel, ADU | Napa · Napa County | — | — |
| Hanes Construction INC | Matthew Sean Hanes | info@hanes-construction.com | (707) 337 5399 | GC, remodel, ADU | Napa · Napa County | — | — |
| Hardin Enterprises | Donald Robert Hardin | — | (707) 965 2255 | Other | St Helena · Napa County | — | — |
| Harris & Sons Floor Covering | Harris & Sons Floor Covering | — | (707) 224 1149 | Other | Napa · Napa County | — | — |
| Hawks & Hawks Wine Caves INC | Stephen Ralph Hawks | — | (707) 942 0712 | GC, remodel, ADU | Calistoga · Napa County | — | — |
| Hayden Morris Development | Hayden Morris Development | — | (707) 320 3611 | GC, remodel, ADU | Napa · Napa County | — | — |
| Hcg Associates INC | Darrel Wayne Harris | anapbm@gmail.com | (415) 722 9290 | GC, remodel, ADU | Napa · Napa County | — | — |
| Hearst Hardwood Floors INC | Michael Hearst Mullet | — | (707) 815 8991 | Other | Napa · Napa County | — | — |
| Heavy Metal Iron INC | Daniel Carl Bong | — | (707) 748 7442 | Other | American Canyon · Napa County | — | — |
| Hedgerow Property Management | Hedgerow Property Management | — | (707) 254-1837 | Property managers | Napa · Napa County | — | — |
| Henderson Tile | Henderson Tile | — | (707) 337 7403 | Other | Napa · Napa County | — | — |