| The Money Tree Inc/services | The Money Tree Inc/services | — | (530) 501-5752 | Tree | Colusa · Colusa County | — | — |
| Thorough Electrical Services | Leslie John Miller | — | (530) 632 9959 | Electricians | Williams · Colusa County | — | — |
| Timberllee | Timberllee | hello@timberllee.com | (530) 492-0262 | GC, remodel, ADU | Colusa · Colusa County | — | — |
| Usa Alarm Systems INC | Usa Alarm Systems INC | info@usaalarmsystems.com | (800) 833-6068 | Alarm and generators | Monrovia · Colusa County | — | — |
| Vaca Building LLC | John Vaca | — | (530) 383 3086 | GC, remodel, ADU | Colusa · Colusa County | — | — |
| Valley Air | Valley Air | — | (530) 458-5181 | GC, remodel, ADU | Colusa · Colusa County | — | — |
| Valley Restoration And Construction INC | Jason August Bremmer | — | (530) 790 7867 | GC, remodel, ADU | Arbuckle · Colusa County | — | — |
| Valquez Electric | Valencia Magana Ruben | — | (530) 218 8470 | Electricians | Williams · Colusa County | — | — |
| Vedo Construction | Scott Francis Vedo | — | (530) 415 1672 | GC, remodel, ADU | Colusa · Colusa County | — | — |
| Walkup Construction | Larry Leroy Walkup | — | (530) 518 1879 | GC, remodel, ADU | Stonyford · Colusa County | — | — |
| West County Plumbing | West County Plumbing | — | (530) 301 7050 | Other | Stonyford · Colusa County | — | — |
| Western Ready Mix Concrete INC | Western Ready Mix Concrete INC | — | (530) 458-7781 | GC, remodel, ADU | Colusa · Colusa County | — | — |
| Weston Buildings INC | Kelly Wade Lewis | — | (530) 473 5696 | GC, remodel, ADU | Williams · Colusa County | — | — |
| Wren Tile | Wren Tile | — | (916) 847 4559 | Other | Colusa · Colusa County | — | — |
| Wright Construction | Paul Timothy Wright | — | (530) 632 9801 | GC, remodel, ADU | Williams · Colusa County | — | — |
| Wycoff Construction INC | Billy Leroy Wycoff | — | (530) 218 1687 | Other | Stonyford · Colusa County | — | — |
| Zuffanelli Construction | Richard Francesco Zuffanelli | — | (831) 247 2298 | GC, remodel, ADU | Stonyford · Colusa County | — | — |