| Darryl Berg And Associates | Darryl George Berg | — | (707) 755 4898 | Windows, patio, painters | Eureka · Humboldt County | — | — |
| Daryl Seidt Construction | Daryl Robert Seidt | — | (707) 834 0416 | GC, remodel, ADU | Eureka · Humboldt County | — | — |
| Dave Co | David Vaughn Klopfenstein | — | (707) 442 0603 | GC, remodel, ADU | Eureka · Humboldt County | — | — |
| David Allen Construction | David Allen Paul | — | (707) 445 8787 | GC, remodel, ADU | Eureka · Humboldt County | — | — |
| David D Livengood Construction | David Darsie Livengood | — | (707) 230 4381 | GC, remodel, ADU | Eureka · Humboldt County | — | — |
| David Haley | David Haley | — | (415) 787 3509 | GC, remodel, ADU | Whitethorn · Humboldt County | — | — |
| David I Dickinson | David I Dickinson | — | (707) 223 5390 | GC, remodel, ADU | Arcata · Humboldt County | — | — |
| David Kelley Construction | David Scott Kelley | — | (707) 599 3088 | GC, remodel, ADU | Willow Creek · Humboldt County | — | — |
| David Kitchen Construction | David Charles Kitchen | — | (707) 498 0948 | GC, remodel, ADU | Eureka · Humboldt County | — | — |
| David Meserve Builder | David Meserve Builder | — | (707) 834 3612 | GC, remodel, ADU | Arcata · Humboldt County | — | — |
| David Slamkowski | David Slamkowski | — | (707) 845 2811 | Other | Westhaven · Humboldt County | — | — |
| Dawn Adams | Dawn Adams | — | (707) 672 4273 | GC, remodel, ADU | Kneeland · Humboldt County | — | — |
| Dawson Brick Block And Stone | Dawson Brick Block And Stone | — | (417) 294 9774 | Other | Fortuna · Humboldt County | — | — |
| Daynard Electric | Arthur William Jr Daynard | — | (707) 839 3891 | Electricians | Mc Kinleyville · Humboldt County | — | — |
| Dc Excavation LLC | Derrick Robert Canevari | — | (707) 834 4331 | Other | Fortuna · Humboldt County | — | — |
| Defco Builders | Defco Builders | — | (707) 572 7301 | GC, remodel, ADU | Eureka · Humboldt County | — | — |
| Degrees Of Green | Degrees Of Green | — | (707) 839 5167 | Windows, patio, painters | Mc Kinleyville · Humboldt County | — | — |
| Delorme Construction | Gregory Phillip Delorme | — | (707) 845 1041 | GC, remodel, ADU | Eureka · Humboldt County | — | — |
| Dennis Byrd Construction | Dennis Marvin Byrd | — | (530) 629 1800 | GC, remodel, ADU | Willow Creek · Humboldt County | — | — |
| Detherage Roofing INC | Delmar Austin Jr Detherage | detherageroofing@gmail.com | (707) 444 3668 | Other roofers | Eureka · Humboldt County | — | — |
| Diamond Drywall | Diamond Drywall | — | (707) 442 4210 | Other | Eureka · Humboldt County | — | — |
| Diamond Touch Roof Cleaning &moss Removal | Diamond Touch Roof Cleaning &moss Removal | — | (707) 506-6845 | Other roofers | Mckinleyville · Humboldt County | — | — |
| Dinsmore Construction Co | Dirk Alan Dinsmore | — | (707) 499 1225 | GC, remodel, ADU | Hydesville · Humboldt County | — | — |
| Dm Hooven INC | David Michael Hooven | — | (707) 498 3703 | Other | Mc Kinleyville · Humboldt County | — | — |
| Dm Roofing | Dillon Matthew Manni | darren@dm-roofing.com | (707) 495 2245 | Other roofers | Eureka · Humboldt County | — | — |
| Dmc Home Building INC | Daniel Patrick Marsh | dan@dmchomebuilding.net | (707) 834 4590 | GC, remodel, ADU | Mc Kinleyville · Humboldt County | — | — |
| Dolcini Land Clearing | Dolcini Land Clearing | — | (707) 499 6191 | Other | Ferndale · Humboldt County | — | — |
| Douglas Chez Construction | Douglas Anthony Chez | — | (707) 298 0821 | GC, remodel, ADU | Blue Lake · Humboldt County | — | — |
| Dovetail Construction | Mitchell Austin Ward | — | (707) 845 6620 | GC, remodel, ADU | Trinidad · Humboldt County | — | — |
| Down To Earth Landscape | Down To Earth Landscape | — | (707) 845 4067 | Windows, patio, painters | Arcata · Humboldt County | — | — |
| Dragonheart Design | Dragonheart Design | — | (707) 798 0531 | GC, remodel, ADU | Eureka · Humboldt County | — | — |
| Duncan Electric | David Wayne Duncan | info@duncanelectricca.com | (707) 502 2768 | Electricians | Eureka · Humboldt County | — | — |
| Dunn Construction | Todd Winfield Dunn | — | (707) 498 3281 | GC, remodel, ADU | Mc Kinleyville · Humboldt County | — | — |
| Dw Construction | David Armstrong Wilbur | — | (707) 834 6299 | GC, remodel, ADU | Blue Lake · Humboldt County | — | — |
| Dynamic Power Systems | Dynamic Power Systems | — | (707) 499 9462 | Electricians | Hydesville · Humboldt County | — | — |
| E A Knox Design/build | E A Knox Design/build | — | (707) 407 7752 | GC, remodel, ADU | Arcata · Humboldt County | — | — |
| E J H Construction INC | Evan Jens Hansen | — | (707) 496 5558 | Other | Rio Dell · Humboldt County | — | — |
| Earth Care Landscaping | Earth Care Landscaping | — | (707) 822 3252 | Windows, patio, painters | Bayside · Humboldt County | — | — |
| Easley's Precision Flooring | Easley's Precision Flooring | — | (707) 845 6245 | Other | Mc Kinleyville · Humboldt County | — | — |
| Ed The Plumber Fitz It Right Plumbing LLC | Clarence Edward Bailey | — | (707) 267 6915 | Other | Eureka · Humboldt County | — | — |