| Able Maintenance INC | Karen Kaye Brownlee | — | (707) 545 5522 | Electricians | Santa Rosa · Sonoma County | — | — |
| Able Roofing Company INC | Jonathan Tracy Wills | jon@ableroofing.biz | (415) 786 7308 | Other roofers | Petaluma · Sonoma County | — | — |
| Above And Beyond Electric | Anthony Murray Graue | — | (707) 235 3954 | Electricians | Sonoma · Sonoma County | — | — |
| Abram W Gomez Construction | Abram Wilson Gomez | — | (415) 517 4082 | GC, remodel, ADU | Sonoma · Sonoma County | — | — |
| Absolute Artistry Custom Cabinets | Absolute Artistry Custom Cabinets | — | (707) 799 3291 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Absolute Comfort Heating & Air Conditioning | Kevin Christopher Fenk | — | (707) 585 3555 | HVAC | Rohnert Park · Sonoma County | — | — |
| Absolute Construction | Todd Steven Bowen | — | (415) 328 2527 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Absolute Electric INC | Robert Jeffry Bechler | — | (707) 766 9633 | Electricians | Petaluma · Sonoma County | — | — |
| Absolute Mechanical | Absolute Mechanical | — | (707) 478 7861 | HVAC | Santa Rosa · Sonoma County | — | — |
| Acapella Building Contractors | David Thomas Grover | — | (707) 789 0422 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Accord Communications | Accord Communications | — | (707) 888 9187 | Electricians | Kenwood · Sonoma County | — | — |
| Accornero Electric | Todd Michael Accornero | — | (707) 228 7410 | Electricians | Santa Rosa · Sonoma County | — | — |
| Accurate Pool And Spa Maintenance | Accurate Pool And Spa Maintenance | — | (707) 481 4041 | Pool | Geyserville · Sonoma County | — | — |
| Ace Court Repair | Ace Court Repair | — | (707) 321 7757 | Other | Santa Rosa · Sonoma County | — | — |
| Ace Insulation Incorporation | Mc Coy Dwaine | — | (707) 584 8377 | Other | Petaluma · Sonoma County | — | — |
| Ace Top Quality Painting | Ace Top Quality Painting | — | (707) 328 2945 | Windows, patio, painters | Rohnert Park · Sonoma County | — | — |
| Acevedo Painting | Acevedo Painting | — | (415) 595 5981 | Windows, patio, painters | Sonoma · Sonoma County | — | — |
| Ach Plumbing & Construction | Robert William Burns | — | (707) 867 7629 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| Acheson General Building | Acheson General Building | — | (707) 835 6366 | GC, remodel, ADU | Windsor · Sonoma County | — | — |
| Acm Painters Corporation | Cruz Maravilla Alejandro | — | (707) 477 5425 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Acme Security Center INC | Jason David Herrington | — | (707) 546 2514 | Alarm and generators | Santa Rosa · Sonoma County | — | — |
| Acoustical Designs | Acoustical Designs | — | (707) 874 9024 | Other | Occidental · Sonoma County | — | — |
| Acrat Plumbing & Heating LLC | David Lee Tarca | — | (707) 322 6095 | HVAC | Petaluma · Sonoma County | — | — |
| Acs Electric | Ian Michael Jones | — | (707) 696 4630 | Electricians | Cloverdale · Sonoma County | — | — |
| Action Plumbing And Heating Maintenance | Action Plumbing And Heating Maintenance | — | (707) 584 0714 | HVAC | Santa Rosa · Sonoma County | — | — |
| Acz Mechanical INC | Zachary James Brown | — | (707) 543 6271 | HVAC | Forestville · Sonoma County | — | — |
| Adalberto Cardenas | Adalberto Cardenas | — | (707) 236 7302 | Other | Santa Rosa · Sonoma County | — | — |
| Adam Clark Electric | Adam Sean Clark | — | (707) 484 4618 | Electricians | Rohnert Park · Sonoma County | — | — |
| Adam Sandow | Adam Sandow | — | (415) 889 8825 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Adam Z Casheros | Adam Z Casheros | — | (707) 280 8477 | Other | Rohnert Park · Sonoma County | — | — |
| Adam's Glass | Adam's Glass | — | (707) 236 2289 | Windows, patio, painters | Rohnert Park · Sonoma County | — | — |
| Adam's Glass And Repair | Adam's Glass And Repair | — | (707) 481 0778 | Windows, patio, painters | Petaluma · Sonoma County | — | — |
| Adams Construction | William Frank Adams | — | (707) 321 2015 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Adams Painting | Adams Painting | — | (707) 318 0092 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Adams Refrigeration Service INC A California Corporation | Brian Thomas Adams | — | (707) 795 6059 | HVAC | Petaluma · Sonoma County | — | — |
| Adams Roofing | Johnnie Lynn Adams | adamsroofing@yahoo.com | (707) 586 7986 | Other roofers | Rohnert Park · Sonoma County | — | — |
| Adams Surfacing | Adams Surfacing | — | (707) 528 9651 | Other | Santa Rosa · Sonoma County | — | — |
| Adan's Electric | Adan Antonio Hernandez Camacho | — | (707) 843 6419 | Electricians | Sonoma · Sonoma County | — | — |
| Adept Remodel And Construction | Scott Joseph Vollert | info@sonomamanagement.com | (707) 938 3177 | GC, remodel, ADU | Sonoma · Sonoma County | — | — |
| Adg Painting | Adg Painting | — | (707) 339 9877 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |