| A I C Construction | Castillo Alonso | — | (707) 542 1052 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| A I G | A I G | — | (707) 729 1558 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| A J D Builders INC | Adam James Diaz | — | (707) 366 0046 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| A J's Painting And Decorating | A J's Painting And Decorating | — | (415) 302 3414 | Windows, patio, painters | Petaluma · Sonoma County | — | — |
| A Juarez Construction | Antonio O Juarez | — | (707) 396 6685 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| A K C Construction | Antonio Curiel Castillo | — | (707) 338 4014 | GC, remodel, ADU | Rohnert Park · Sonoma County | — | — |
| A L'ancienne Imports INC | Pascal Faivre | info@alaimports.com | (707) 996 2550 | Other | Sonoma · Sonoma County | — | — |
| A Lost Art INC | Joseph Douglas Jr Bryant | — | (415) 392 7577 | Other | Petaluma · Sonoma County | — | — |
| A M Electric | Pena Mejia Alejandro | — | (707) 332 8099 | Electricians | Penngrove · Sonoma County | — | — |
| A Man Around The House INC | James Sean| Mattingly Sean Mattingly | — | (415) 297 4956 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| A N D Construction | Arthur Allen Mills | — | (707) 346 7738 | GC, remodel, ADU | Sonoma · Sonoma County | — | — |
| A N R Roofing Of Petaluma INC | Eloy Rigoverto Jimenez-martinez | — | (707) 548 9576 | Other roofers | Santa Rosa · Sonoma County | — | — |
| A O G Plumbing INC | Orozco Guerrero Alberto | — | (707) 953 2541 | Other | Rohnert Park · Sonoma County | — | — |
| A P M Homes INC | Aaron Paul Matz | — | (707) 544 7194 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| A Plus Locksmith | A Plus Locksmith | — | (707) 431 0400 | Other | Windsor · Sonoma County | — | — |
| A Plus Pool & Spa INC | John Patrick Fetcko | — | (707) 575 4360 | Pool | Santa Rosa · Sonoma County | — | — |
| A S A P Plumbing | A S A P Plumbing | — | (707) 544 2727 | Other | Forestville · Sonoma County | — | — |
| A S B Steel | A S B Steel | — | (707) 477 3586 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| A Scott Building | A Scott Building | — | (707) 481 7088 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| A Touch Of Splash INC | Ronald Carl Friedrichsen | — | (707) 769 1095 | Pool | Petaluma · Sonoma County | — | — |
| A+ General Contractor INC | Alfredo Mendoza Gutierrez | — | (510) 813 4422 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| A+ Quality Roofing | Darren Carl Richards | — | (707) 935 6580 | Other roofers | Glen Ellen · Sonoma County | — | — |
| A-1 Builders General Contractors INC | Craig Brian Mason | — | (707) 570 2900 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| A9 Construction | Steven Wayne Harrison | impallari@gmail.com | (707) 477 1086 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Aaa Blasting INC | Gonzalo Diaz Zesati | — | (707) 328 3543 | Other | Santa Rosa · Sonoma County | — | — |
| Aaa Energy Systems INC | Laurel Jean Lewis | info@aaaenergysystems.com | (707) 585 8670 | HVAC | Santa Rosa · Sonoma County | — | — |
| Aaa Home Renovations | Aaa Home Renovations | — | (707) 529 0709 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Aaron Blair Painting | Aaron Blair Painting | — | (707) 304 0085 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Aaron Bogdanyi Electric INC | Aaron William Bogdanyi | — | (707) 364 0010 | Electricians | Sebastopol · Sonoma County | — | — |
| Aaron Celovsky Electric | Aaron Samuel Celousky | — | (707) 328 3827 | Electricians | Santa Rosa · Sonoma County | — | — |
| Aaron Marion Arellanes | Aaron Marion Arellanes | — | (707) 595 6033 | Other | Petaluma · Sonoma County | — | — |
| Ab Painting | Ab Painting | a.borg@ab-painting.com | (707) 367 2935 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Aba Custom Homes INC | Freeman Lee Barton | — | (707) 575 3228 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Abbey Carpet Of Petaluma | Brian John Miller | — | (707) 762 5514 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Abc Home Repairs | Alexander Kofman | alex@abchomerepairs.com | (707) 238 5000 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Abd Construction INC | Wesley Wayne Adkins | — | (707) 740 3446 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Abel Metal Roofing | Abel Flores Jimenez | — | (707) 494 6334 | Other roofers | Cotati · Sonoma County | — | — |
| Abel's Concrete Finishing | Abel's Concrete Finishing | — | (707) 799 1778 | Other | Santa Rosa · Sonoma County | — | — |
| Abide International INC | Martin James| Rapozo Marty Rapozo | — | (707) 935 1577 | GC, remodel, ADU | Sonoma · Sonoma County | — | — |
| Able Fence Company INC | Dave Castillo | — | (707) 763 2551 | Other | Petaluma · Sonoma County | — | — |