| Jason Morris Plumbing | Jason Morris Plumbing | — | (707) 997 3161 | Other | Windsor · Sonoma County | — | — |
| Jason Rochlin Construction | Jason Michael Rochlin | — | (707) 849 6179 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Javier Valencia Tile Stone | Javier Valencia Tile Stone | — | (209) 605 0154 | Other | Santa Rosa · Sonoma County | — | — |
| Jaw INC | James Howard Whitfield | — | (707) 477 8784 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Jay B Johnson Painting | Jay B Johnson Painting | — | (707) 280 2328 | Windows, patio, painters | Cotati · Sonoma County | — | — |
| Jay Du May's Ceramic And Stone Tile Installations | George Jay Du May | — | (707) 328 2417 | Other | Santa Rosa · Sonoma County | — | — |
| Jayme Elan Patterson | Jayme Elan Patterson | — | (415) 446 8940 | Other | Santa Rosa · Sonoma County | — | — |
| Jaz Concrete Construction INC | Jose Luis Jr Alfaro Zelaya | — | (707) 703 0621 | Other | Sonoma · Sonoma County | — | — |
| Jb Rapoza Refrigeration Consulting LLC | Susan Lynn Caletti | — | (707) 975 8960 | HVAC | Petaluma · Sonoma County | — | — |
| Jb Tile | Jb Tile | — | (415) 847 3393 | Other | Petaluma · Sonoma County | — | — |
| Jbl Solar Energy INC DBA Ocal | Prom Sambath | — | (707) 388 2001 | Other roofers | Santa Rosa · Sonoma County | — | — |
| Jbtree 365 | Jbtree 365 | — | (970) 509 9446 | Tree | Sebastopol · Sonoma County | — | — |
| Jc Design Builders | Juan Angel Chavarria | — | (707) 477 3131 | GC, remodel, ADU | Rohnert Park · Sonoma County | — | — |
| Jc Padilla Painting | Juan Carlos Padilla | — | (707) 774 9674 | Windows, patio, painters | Rohnert Park · Sonoma County | — | — |
| Jc Plasteri | Jc Plasteri | — | (707) 889 9778 | Other | Santa Rosa · Sonoma County | — | — |
| Jc Roofing Residential Services Corporation | Concepcion Marcelino Jorge | — | (707) 561 1117 | Other roofers | Windsor · Sonoma County | — | — |
| Jcw General Construction INC | Timothy Jacob Klyberg | — | (925) 565 4905 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Jdm Painting And Staining INC | Justin David Myers | — | (707) 395 0778 | Windows, patio, painters | Healdsburg · Sonoma County | — | — |
| Jedi Properties | Jedi Properties | — | (707) 391 6284 | GC, remodel, ADU | Windsor · Sonoma County | — | — |
| Jef Painting INC | Zamora Enrique Hernandez | — | (707) 267 1087 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Jeff Ceresa & Son Construction INC | Jeff James Ceresa | — | (707) 762 8069 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Jeff Lester Arborist | Jeffrey Forrest Lester | — | (707) 703 2508 | Other | Santa Rosa · Sonoma County | — | — |
| Jeff Schefer's Plumbing Service | Jeffrey Scott Schefer | — | (707) 849 5238 | Other | Santa Rosa · Sonoma County | — | — |
| Jeff Vice Concrete Construction INC | Jeffrey David Vice | — | (707) 322 8412 | Other | Windsor · Sonoma County | — | — |
| Jeff Wyffels Construction | Jeffrey John Wyffels | — | (707) 206 5821 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Jeff's Painting & Decorating | Jeff's Painting & Decorating | — | (707) 843 2880 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Jeffco General Engineering INC | Jeffrey Allen Carlson | — | (707) 290 8974 | Other | Santa Rosa · Sonoma County | — | — |
| Jeffcoat Painting And Decorating | Jeffcoat Painting And Decorating | — | (707) 585 7737 | Windows, patio, painters | Rohnert Park · Sonoma County | — | — |
| Jeffery Scott Porter | Jeffery Scott Porter | — | (707) 246 4781 | Other | Santa Rosa · Sonoma County | — | — |
| Jeffrey W Tawney | Jeffrey W Tawney | — | (707) 829 9198 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| Jeffries Electric | Michael Patrick Jeffries | — | (707) 695 1385 | Electricians | Windsor · Sonoma County | — | — |
| Jem Drywall Construction | Estrada Mejia Jose | — | (707) 495 9634 | Other | Santa Rosa · Sonoma County | — | — |
| Jenaro's Tile & Stone INC | Jenaro Martinez | — | (707) 695 2311 | Other | Santa Rosa · Sonoma County | — | — |
| Jenkins Plumbing | Jenkins Plumbing | — | (707) 545 1194 | Other | Santa Rosa · Sonoma County | — | — |
| Jennings Mc Cann Construction | Benjamin Mc Cann Jennings | — | (510) 388 4441 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Jeremiah's Construction Co | Jeremiah Francis Iii O'neill | — | (707) 479 0144 | GC, remodel, ADU | Duncans Mills · Sonoma County | — | — |
| Jeremy Allen Construction | Jeremy Lamont Allen | — | (707) 953 6421 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| Jerrad Jensen | Jerrad Jensen | — | (707) 975 2064 | Other | Petaluma · Sonoma County | — | — |
| Jerry Hanrahan | Jerry Hanrahan | — | (707) 542 5483 | Electricians | Santa Rosa · Sonoma County | — | — |
| Jerry's Refrigeration | Cary Franklin Joseph | — | (707) 762 2025 | HVAC | Petaluma · Sonoma County | — | — |