| J D P Drywall | J D P Drywall | — | (707) 479 0127 | Other | Santa Rosa · Sonoma County | — | — |
| J D S Flooring | J D S Flooring | — | (415) 559 1903 | Other | Petaluma · Sonoma County | — | — |
| J Diangson Remodel INC | Jim Christopher Diangson | — | (707) 235 2619 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| J E C Stone INC | Martyn Edward Peachey | martyn@jecstone.com | (415) 260 8262 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| J G Becerra Landscape Management | J G Becerra Landscape Management | — | (707) 321 3036 | Windows, patio, painters | Petaluma · Sonoma County | — | — |
| J G Hardwood Flooring | J G Hardwood Flooring | — | (707) 529 9717 | Other | Sebastopol · Sonoma County | — | — |
| J Garvisch Construction | James Frederick Al Garvisch | — | (510) 813 8877 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| J H D Construction | Joel Henri Durand | — | (707) 328 5857 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| J H Electric | Hernandez Javier | — | (707) 935 2800 | Electricians | Sonoma · Sonoma County | — | — |
| J Hall Construction | Jeremy Wade Hall | — | (707) 292 6141 | GC, remodel, ADU | Rohnert Park · Sonoma County | — | — |
| J K Electric | James Marshall Koehler | — | (707) 547 7441 | Electricians | Santa Rosa · Sonoma County | — | — |
| J K P Mullins Construction INC | Kerry Patrick Mullins | — | (707) 576 7853 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| J K T Associates INC | Jose J Angulo | info@jktassociates.com | (707) 766 6336 | GC, remodel, ADU | Sonoma · Sonoma County | — | — |
| J K Tile Co | John Lawrence Kidder | — | (707) 477 4576 | Other | Petaluma · Sonoma County | — | — |
| J L Builders | J L Builders | — | (707) 327 8127 | GC, remodel, ADU | Healdsburg · Sonoma County | — | — |
| J L Builders | Jeffrey Thomas Luchetti | — | (707) 527 5788 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| J L Modular INC | Jeffrey Thomas Luchetti | — | (707) 527 5788 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| J Landscape Services | Jay Francis Bretz | — | (707) 799 4881 | Windows, patio, painters | Healdsburg · Sonoma County | — | — |
| J Lerdahl Construction | Jeff Todd Lerdahl | — | (707) 529 6279 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| J M & Sons Painting And Decorating | John Martin Chambers | — | (707) 304 9196 | Windows, patio, painters | Healdsburg · Sonoma County | — | — |
| J M Burger Company General Contracting | John Matthew Burger | — | (707) 632 4018 | GC, remodel, ADU | Cazadero · Sonoma County | — | — |
| J M Guzman's Masonry | J M Guzman's Masonry | info@jmguzmansmasonry.com | (415) 516 0824 | Tree | Rohnert Park · Sonoma County | — | — |
| J M L Construction | Jamie Michael Lucy | brian@jmlconstruction.com | (573) 429-4962 | GC, remodel, ADU | Glen Ellen · Sonoma County | — | — |
| J M S Mechanical INC | Melissa Ann Ullom | — | (707) 585 0120 | HVAC | Rohnert Park · Sonoma County | — | — |
| J N E Construction INC | James Noble Entriken | — | (707) 318 8616 | GC, remodel, ADU | Cazadero · Sonoma County | — | — |
| J O D Construction | James Anthony Dowd | — | (415) 793 0615 | GC, remodel, ADU | Rohnert Park · Sonoma County | — | — |
| J Palmer Construction INC | Jeffrey Wayne Palmer | — | (707) 483 5000 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| J Prime Builders | J Prime Builders | info@mysite.com | (707) 304 4580 | GC, remodel, ADU | Windsor · Sonoma County | — | — |
| J R A Construction | Jason Robert Alley | — | (707) 337 4005 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| J R Excavating & Sons INC | Jennifer Diane Hardister | — | (707) 975 2719 | Other | Sonoma · Sonoma County | — | — |
| J R L Electric | Janet Rosita Kerrigan | — | (707) 540 5119 | Electricians | Petaluma · Sonoma County | — | — |
| J Richards Construction | Jeremy Joseph Richards | — | (707) 479 6090 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| J Ruiz Builders LLC | Jose Ruiz | — | (707) 695 9702 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| J S Construction | Jeffrey William Sutton | — | (707) 322 1944 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| J Solis Landscaping | Solis Rivas Javier | — | (707) 481 5260 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| J T Antone Construction | Jade Thomas Antone | — | (707) 787 7258 | GC, remodel, ADU | Sonoma · Sonoma County | — | — |
| J T M Custom Builders | Joshua Tyler Metoyer | — | (707) 815 1443 | GC, remodel, ADU | Sonoma · Sonoma County | — | — |
| J T Murray Electronics | J T Murray Electronics | — | (707) 889 6160 | Electricians | Santa Rosa · Sonoma County | — | — |
| J T Tilestone | J T Tilestone | — | (707) 830 0823 | Other | Santa Rosa · Sonoma County | — | — |
| J T Z Plumbing | J T Z Plumbing | amkryukov@gmail.com | (707) 953 7700 | Other | Windsor · Sonoma County | — | — |