| Horvath Plumbing | Horvath Plumbing | — | (707) 683 6907 | Other | Eureka · Humboldt County | — | — |
| Hosbach Construction | Jeffrey Ronald Hosbach | — | (707) 826 1060 | GC, remodel, ADU | Arcata · Humboldt County | — | — |
| Houseworth Construction | Michael Shannon Houseworth | — | (707) 362 0453 | GC, remodel, ADU | Eureka · Humboldt County | — | — |
| Howard And Olsen Electric | Marc Delay Howard | — | (678) 576 3600 | Electricians | Eureka · Humboldt County | — | — |
| Howard Harvey Construction | Howard Blair Harvey | — | (903) 599 2866 | GC, remodel, ADU | Willow Creek · Humboldt County | — | — |
| Hrynkiewicz Construction | Daniel Eric Hrynkiewicz | — | (707) 777 3321 | GC, remodel, ADU | Blocksburg · Humboldt County | — | — |
| Hufford Construction | Joseph Edward Hufford | — | (707) 488 2602 | Other | Orick · Humboldt County | — | — |
| Huggler Construction | Richard Webster Huggler | — | (707) 768 3190 | Electricians | Fortuna · Humboldt County | — | — |
| Humboldt Bay Construction | Peter Joseph Lusa | — | (707) 273-7594 | GC, remodel, ADU | Eureka · Humboldt County | — | — |
| Humboldt Bay Construction Co | Kyler Cole Gouthier | — | (707) 273 7594 | GC, remodel, ADU | Eureka · Humboldt County | — | — |
| Humboldt Building Inspection | Humboldt Building Inspection | — | (707) 445-7245 | Inspectors | Eureka · Humboldt County | — | — |
| Humboldt Carpentry | Humboldt Carpentry | — | (707) 223 0133 | GC, remodel, ADU | Miranda · Humboldt County | — | — |
| Humboldt Cctv | Humboldt Cctv | — | (707) 499-3932 | Alarm and generators | Mckinleyville · Humboldt County | — | — |
| Humboldt Construction Company INC | Kenneth Scott Moffitt | chance@humboldtconstruction.com | (707) 502 2020 | GC, remodel, ADU | Eureka · Humboldt County | — | — |
| Humboldt Electric | Damieon Dayon Foster | sarahfae@humboldtelectric707.com | (707) 840 3430 | Electricians | Eureka · Humboldt County | — | — |
| Humboldt Hearthstones | Humboldt Hearthstones | humboldthearthstones@gmail.com | (530) 228 2919 | Other | Arcata · Humboldt County | — | — |
| Humboldt Home Inspections | Humboldt Home Inspections | micah@micahrich.com | (707) 498-2340 | Inspectors | Eureka · Humboldt County | — | — |
| Humboldt Home Maintenance & Construction | Robert Henry Borck | humboldt.home@aol.com | (707) 599 3918 | GC, remodel, ADU | Eureka · Humboldt County | — | — |
| Humboldt Home Repair | Humboldt Home Repair | — | (707) 599-1184 | Restoration | Eureka · Humboldt County | — | — |
| Humboldt Insulation | Humboldt Insulation | — | (707) 857 6757 | Other | Eureka · Humboldt County | — | — |
| Humboldt Landscape | Humboldt Landscape | humboldtlandscape@gmail.com | (707) 834 3190 | Windows, patio, painters | Arcata · Humboldt County | — | — |
| Humboldt Mechanical Solutions | Humboldt Mechanical Solutions | — | (707) 616 7420 | HVAC | Arcata · Humboldt County | — | — |
| Humboldt Painting & Refinishing | Humboldt Painting & Refinishing | — | (707) 498 0355 | Windows, patio, painters | Rio Dell · Humboldt County | — | — |
| Humboldt Plumbing | Humboldt Plumbing | — | (707) 498 5387 | Other | Cutten · Humboldt County | — | — |
| Humboldt Pressure Wash | Humboldt Pressure Wash | — | (707) 605 1640 | Other | Arcata · Humboldt County | — | — |
| Humboldt Pro Tiling | Humboldt Pro Tiling | impallari@gmail.com | (707) 382 7794 | Other | Arcata · Humboldt County | — | — |
| Humboldt Property Management | Humboldt Property Management | info@humboldtrentals.com | (707) 825-1515 | Property managers | Arcata · Humboldt County | — | — |
| Humboldt Renovation And Design LLC | Travis Wayne Byram | — | (707) 273 1078 | GC, remodel, ADU | Eureka · Humboldt County | — | — |
| Humboldt Shire | Humboldt Shire | — | (707) 407-5121 | Restoration | Eureka · Humboldt County | — | — |
| Humboldt Squeegee LLC | Humboldt Squeegee LLC | — | (707) 798-2121 | Windows, patio, painters | Fortuna · Humboldt County | — | — |
| Humbuildt Homes | Humbuildt Homes | — | (707) 616 1172 | GC, remodel, ADU | Arcata · Humboldt County | — | — |
| Hunt Painting Company | Tyler Alan Hunt | — | (707) 834 0400 | Windows, patio, painters | Arcata · Humboldt County | — | — |
| Hunter And Son Construction INC | Robert Kean Jr Hunter | jhunter@gmail.com | (707) 499 2614 | GC, remodel, ADU | Fortuna · Humboldt County | — | — |
| Hurst Construction | Dustin Michael Hurst | — | (707) 599 0402 | GC, remodel, ADU | Fortuna · Humboldt County | — | — |
| Hyman Construction | Donald Wayne Hyman | — | (707) 839 2962 | GC, remodel, ADU | Mc Kinleyville · Humboldt County | — | — |
| Hz Buildworks LLC | Ryan Patrick Hayes | — | (707) 616 8448 | GC, remodel, ADU | Arcata · Humboldt County | — | — |
| Iaqua Construction And Logging | Jacob Daniel Moore | — | (707) 496 7481 | Other | Kneeland · Humboldt County | — | — |
| Imperial Electric | Kyle William Schafer | — | (707) 298 1614 | Electricians | Arcata · Humboldt County | — | — |
| Industrial Electric Services Co | Industrial Electric Services Co | — | (707) 822-2485 | Electricians | Arcata · Humboldt County | — | — |
| Innerlight | Joseph Newton O'gorman | — | (707) 362 5439 | Electricians | Blue Lake · Humboldt County | — | — |