| 101 Hauling Corp | Sanchez Christopher | — | (707) 500 2100 | GC, remodel, ADU | Rohnert Park · Sonoma County | — | — |
| 21st Century Builder | 21st Century Builder | — | (707) 975 6441 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| 3 C Building | 3 C Building | — | (415) 246 6994 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| 3 D Remodeling & Renovation | 3 D Remodeling & Renovation | — | (707) 816 2646 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| 3D Building Company | Romero Antonio Navarro | 3dbuildingeurope@gmail.com | (650) 826 7763 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| 3M Construction Company | Michael Steven Massoletti | — | (415) 308 2911 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| 707 Plumbers INC | Kirk Lewis Walton | — | (707) 292 2262 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| A & C Noma Construction INC | Charles Noma Iv Harris | — | (707) 328 9273 | GC, remodel, ADU | Cotati · Sonoma County | — | — |
| A & M Builders | A & M Builders | — | (707) 331 2915 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| A B L Construction | Aaron Namaste Bruton-long | contactus@ablconstruction.com | (707) 827 3450 | GC, remodel, ADU | Graton · Sonoma County | — | — |
| A B Steel Construction | Anthony Michael Barrett | — | (707) 235 4987 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| A Better World Construction | Laird Davis Norgeot | — | (707) 273 2389 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| A C Menne | A C Menne | — | (707) 318 1403 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| A C P Construction Company | Aaron Craig Popielak | — | (707) 637 3163 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| A D Construction | Alan Dale Fudge | amkryukov@gmail.com | (707) 477 4646 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| A E Contractors INC | Jose Maria Rivera | — | (707) 331 7226 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| A Frame Construction | Mason Benton Lessard | — | (707) 480 0740 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| A G Builders | A G Builders | — | (707) 332 2156 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| A G Construction | Aaron Jason Grail | — | (707) 292 4097 | GC, remodel, ADU | Cotati · Sonoma County | — | — |
| A G S Construction | Al Geary Jr Smith | — | (707) 799 1314 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| A I C Construction | Castillo Alonso | — | (707) 542 1052 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| A J D Builders INC | Adam James Diaz | — | (707) 366 0046 | GC, remodel, ADU | Santa Rosa · 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 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 P M Homes INC | Aaron Paul Matz | — | (707) 544 7194 | GC, remodel, ADU | Santa Rosa · 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+ General Contractor INC | Alfredo Mendoza Gutierrez | — | (510) 813 4422 | GC, remodel, ADU | Santa Rosa · 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 Home Renovations | Aaa Home Renovations | — | (707) 529 0709 | GC, remodel, ADU | 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 | — | — |
| Abide International INC | Martin James| Rapozo Marty Rapozo | — | (707) 935 1577 | GC, remodel, ADU | 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 | — | — |