| 707 Builders | 707 Builders | — | (707) 601 3825 | GC, remodel, ADU | Bayside · Humboldt County | — | — |
| A & M Builders LLC | Alan George Parks | — | (707) 834 1315 | GC, remodel, ADU | Mc Kinleyville · Humboldt County | — | — |
| A And G Concrete | Steve Dennis Ambrosini | — | (707) 832 6079 | GC, remodel, ADU | Fortuna · Humboldt County | — | — |
| A F Contracting | James Allen Alves | — | (707) 601 1008 | GC, remodel, ADU | Eureka · Humboldt County | — | — |
| A Lefevre General Contractor | A Lefevre General Contractor | — | (707) 845 6317 | GC, remodel, ADU | Arcata · Humboldt County | — | — |
| Aaron Dulitz | Aaron Dulitz | — | (805) 459 3928 | GC, remodel, ADU | Fortuna · Humboldt County | — | — |
| Aaron Thomas Construction | Aaron Matthew Thomas | — | (707) 298 7369 | GC, remodel, ADU | Eureka · Humboldt County | — | — |
| Aaron's Construction | Aaron Rollan Moschetti | — | (707) 496 0180 | GC, remodel, ADU | Scotia · Humboldt County | — | — |
| Abco-american Building Company | Gregory William Schneider | — | (707) 677 3714 | GC, remodel, ADU | Trinidad · Humboldt County | — | — |
| Abercrombie Construction | Jeffrey Michael Abercrombie | — | (707) 845 1794 | GC, remodel, ADU | Eureka · Humboldt County | — | — |
| Adams Commercial General Contracting INC | Will Edward Adams | — | (707) 443 6000 | GC, remodel, ADU | Eureka · Humboldt County | — | — |
| Adams Construction | Stephen Larry Allen Adams | — | (707) 496 0557 | GC, remodel, ADU | Fortuna · Humboldt County | — | — |
| Alan Bongio Construction INC | Alan Paul Bongio | — | (707) 499 5820 | GC, remodel, ADU | Eureka · Humboldt County | — | — |
| Alchemy Construction Incorporated | Amy Christine Bohner | — | (707) 822 8013 | GC, remodel, ADU | Arcata · Humboldt County | — | — |
| Allen Epperly Construction | Allen Hopkins Epperly | — | (707) 599 7723 | GC, remodel, ADU | Arcata · Humboldt County | — | — |
| Alternative Building Services | Michael James Matson | — | (707) 616 4131 | GC, remodel, ADU | Arcata · Humboldt County | — | — |
| Ameri-construction | David Kyle Koltko | — | (707) 498 7873 | GC, remodel, ADU | Ferndale · Humboldt County | — | — |
| Anderson Built Construction | Brandon Nicholas Anderson | — | (707) 496 5398 | GC, remodel, ADU | Mc Kinleyville · Humboldt County | — | — |
| Anderson Construction | Jeremiah Lee Anderson | — | (707) 498 1420 | GC, remodel, ADU | Eureka · Humboldt County | — | — |
| Andrew Sederberg | Andrew Sederberg | — | (707) 496 3225 | GC, remodel, ADU | Loleta · Humboldt County | — | — |
| Andy Lane | Andy Lane | andy@andylane.com | (707) 839 2263 | GC, remodel, ADU | Mc Kinleyville · Humboldt County | — | — |
| Anu Way Construction | Nathaniel Andrew Schneider | — | (707) 273 3715 | GC, remodel, ADU | Hydesville · Humboldt County | — | — |
| Apex Building Solutions | Anthony Allan Thompson | admin@apex-building-solutions.com | (707) 601 0740 | GC, remodel, ADU | Bayside · Humboldt County | — | — |
| Arbco Construction | Norman Gregg Arbec | — | (707) 845 0402 | GC, remodel, ADU | Cutten · Humboldt County | — | — |
| Arcata Building Co. | Jonathan Eugene Fechner | — | (707) 407 5623 | GC, remodel, ADU | Blue Lake · Humboldt County | — | — |
| Aronson Builders | Aronson Builders | — | (707) 496 2159 | GC, remodel, ADU | Eureka · Humboldt County | — | — |
| Atkins - Salazar Construction | Terry Gene Atkins | — | (707) 496 3248 | GC, remodel, ADU | Arcata · Humboldt County | — | — |
| Azalea Building Company | Scott Lawrence Wallach | — | (707) 298 5934 | GC, remodel, ADU | Mc Kinleyville · Humboldt County | — | — |
| B & C Eco Friendly Construction INC | Todd Michael Bates | — | (707) 845 8410 | GC, remodel, ADU | Mc Kinleyville · Humboldt County | — | — |
| B E J Construction | Brandon Earl Johnson | — | (707) 498 1182 | GC, remodel, ADU | Kneeland · Humboldt County | — | — |
| Backman Building Services LLC | John Michael Backman | — | (707) 499 1809 | GC, remodel, ADU | Eureka · Humboldt County | — | — |
| Barrer Construction | Michael Zinehart Barrer | — | (707) 599 8245 | GC, remodel, ADU | Ferndale · Humboldt County | — | — |
| Barry Smith Construction INC | Barry Conrad Smith | info@barrysmithconstruction.com | (707) 499 4386 | GC, remodel, ADU | Eureka · Humboldt County | — | — |
| Bayline Construction And Remodel | Jeromy Paul Shull | — | (530) 356 2136 | GC, remodel, ADU | Blue Lake · Humboldt County | — | — |
| Beacom Construction Co | Earl James Jr Ambrosini | zzzzzzzzzzzzz@gmail.com | (707) 725 3323 | GC, remodel, ADU | Fortuna · Humboldt County | — | — |
| Belak Construction Co | Peter Charles Belak | — | (707) 496 0684 | GC, remodel, ADU | Eureka · Humboldt County | — | — |
| Ben Construction | Hakim Nathaniel Ben-Iesau | — | (707) 840 0410 | GC, remodel, ADU | Mc Kinleyville · Humboldt County | — | — |
| Ben Maulden Construction INC | Ben Maulden | — | (707) 502 5718 | GC, remodel, ADU | Arcata · Humboldt County | — | — |
| Benson Dakota Mc Mahon Construction | Benson Dakota Mc Mahon | — | (707) 223 1605 | GC, remodel, ADU | Whitethorn · Humboldt County | — | — |
| Bergel Construction | John Eric Bergel | — | (707) 845 0003 | GC, remodel, ADU | Eureka · Humboldt County | — | — |