| Guy Peltier Construction | Guy Gerald Peltier | — | (707) 496 4700 | GC, remodel, ADU | Mc Kinleyville · Humboldt County | — | — |
| H&h Painters INC | Jeremy James Holland | — | (707) 273 2558 | Windows, patio, painters | Fortuna · Humboldt County | — | — |
| Hall Construction | Brian Ray Hall | — | (707) 496 3242 | GC, remodel, ADU | Rio Dell · Humboldt County | — | — |
| Hall's Excavation | Hall's Excavation | — | (707) 498 7230 | Other | Fortuna · Humboldt County | — | — |
| Hall's Metal Works | Hall's Metal Works | info@hallsmetalworks.com | (707) 499 5346 | Other | Eureka · Humboldt County | — | — |
| Hamanaka Painting Co INC | Glenn Robert Hamanaka | — | (707) 444 3340 | GC, remodel, ADU | Eureka · Humboldt County | — | — |
| Han Frye Construction | Bill Han Frye | — | (707) 845 4587 | GC, remodel, ADU | Eureka · Humboldt County | — | — |
| Hancock Home Renovations | Hancock Home Renovations | — | (707) 502 5484 | GC, remodel, ADU | Eureka · Humboldt County | — | — |
| Hardy's Plumbing | Hardy's Plumbing | — | (707) 601 4968 | Other | Eureka · Humboldt County | — | — |
| Hardybuilt Custom Construction INC | Justin M Hardy | — | (707) 841 1800 | GC, remodel, ADU | Mc Kinleyville · Humboldt County | — | — |
| Hartgrave Building Company | Chad Elliott Hartgrave | — | (707) 601 7047 | GC, remodel, ADU | Trinidad · Humboldt County | — | — |
| Hartman Construction | Matthew Benjamin Hartman | — | (707) 616 8619 | GC, remodel, ADU | Carlotta · Humboldt County | — | — |
| Harvey Construction | Matthew Scott Harvey | — | (707) 496 0983 | GC, remodel, ADU | Eureka · Humboldt County | — | — |
| Hassle Free Chimney Care | Hassle Free Chimney Care | — | (707) 499 7529 | Other | Mc Kinleyville · Humboldt County | — | — |
| Haus Construction INC | Max Henry Niehaus | impallari@gmail.com | (707) 499 2089 | GC, remodel, ADU | Arcata · Humboldt County | — | — |
| Haven-electric INC | Mark Christopher Schaeffer | — | (707) 502 5454 | Other roofers | Blue Lake · Humboldt County | — | — |
| Hawk Painting | Hawk Painting | — | (707) 499 9041 | Windows, patio, painters | Eureka · Humboldt County | — | — |
| Heartwood Design/build | Heartwood Design/build | tomas@heartwooddesignbuild.com | (707) 798 1759 | GC, remodel, ADU | Bayside · Humboldt County | — | — |
| Hebrew 3 4 | Hebrew 3 4 | — | (707) 923 3333 | GC, remodel, ADU | Garberville · Humboldt County | — | — |
| Heier Quality Drywall | Heier Quality Drywall | — | (808) 740 1663 | Other | Willow Creek · Humboldt County | — | — |
| Heinichen Construction Co | Jon Robert Heinichen | — | (707) 599 2918 | GC, remodel, ADU | Ferndale · Humboldt County | — | — |
| Hemmingsen Pavement Solutions | Hemmingsen Pavement Solutions | — | (707) 826 7283 | Other | Cutten · Humboldt County | — | — |
| Henry S Avelar General Contractor | Henry S Avelar General Contractor | — | (707) 599 5749 | GC, remodel, ADU | Mc Kinleyville · Humboldt County | — | — |
| Henson's Cabinets | Henson's Cabinets | — | (707) 443 5106 | Other | Mc Kinleyville · Humboldt County | — | — |
| Hernandez Construction | Hernandez Hernandez Eusebio | oscarghernandezalberto@gmail.com | (707) 298 9790 | GC, remodel, ADU | Eureka · Humboldt County | — | — |
| Heryford Electric & Communications | John Lee Heryford | — | (707) 834 2581 | Electricians | Fortuna · Humboldt County | — | — |
| Hesch Construction | Timothy James Hesch | — | (575) 779 8293 | GC, remodel, ADU | Fortuna · Humboldt County | — | — |
| High Tide Design | High Tide Design | — | (707) 499 2629 | GC, remodel, ADU | Mc Kinleyville · Humboldt County | — | — |
| Hilltop Builder | Hilltop Builder | — | (707) 442 1233 | GC, remodel, ADU | Eureka · Humboldt County | — | — |
| Hinrichs Plumbing | Hinrichs Plumbing | — | (707) 834 4199 | Other | Eureka · Humboldt County | — | — |
| Hobie Construction | James Hobart Smith | — | (707) 601 0939 | GC, remodel, ADU | Eureka · Humboldt County | — | — |
| Hoffman Homes | Hoffman Homes | — | (707) 845 1310 | GC, remodel, ADU | Rio Dell · Humboldt County | — | — |
| Holt Electric | Dale Arlyn Holt | — | (707) 599 8155 | Electricians | Eureka · Humboldt County | — | — |
| Homeowner Helper INC | Neal Andrew Guthrie | — | (712) 229 1888 | GC, remodel, ADU | Arcata · Humboldt County | — | — |
| Homes Inspection | Homes Inspection | — | (619) 715-4436 | Inspectors | El Cajon · Humboldt County | — | — |
| Homestead Builders | Homestead Builders | — | (707) 601 6400 | GC, remodel, ADU | Eureka · Humboldt County | — | — |
| Hooven & Co INC | Arthur Tillson Hooven | — | (707) 839 1291 | Electricians | Mc Kinleyville · Humboldt County | — | — |
| Horner Construction | Trevor Jay Horner | — | (970) 518 5503 | GC, remodel, ADU | Eureka · Humboldt County | — | — |
| Horst Plumbing | Horst Plumbing | — | (707) 768 2060 | Other | Fortuna · Humboldt County | — | — |
| Horvath Fire Sprinkler | Horvath Fire Sprinkler | — | (707) 683 6907 | Other | Eureka · Humboldt County | — | — |