| Henry J Rabbitt & Sons INC | Michael Francis Rabbitt | — | (415) 999 9115 | GC, remodel, ADU | Napa · Napa County | — | — |
| Herb Electric | Sergio Divier Herbert | — | (415) 819 7769 | Electricians | American Canyon · Napa County | — | — |
| Heritage Painting | Luis Carlos Coronado | — | (707) 252 8273 | Windows, patio, painters | Napa · Napa County | — | — |
| Heritage Systems INC | Grant David Gieseke | — | (707) 258 0553 | Other | Napa · Napa County | — | — |
| Hermes Plumbing INC | Ryan Michael Hermes | info@hermes-plumbing.com | (707) 690 8172 | Other | Napa · Napa County | — | — |
| Hernandez Masonry | Hernandez Masonry | — | (707) 495 1412 | Other | Napa · Napa County | — | — |
| Heun Pacific Construction LLC | Joel David Heun | — | (707) 303 0904 | GC, remodel, ADU | Calistoga · Napa County | — | — |
| Hoag Husted Construction | Don Wallace Husted | — | (707) 486 3736 | GC, remodel, ADU | Napa · Napa County | — | — |
| Hole In The Wall Drywall | Hole In The Wall Drywall | — | (707) 312 0445 | Other | Napa · Napa County | — | — |
| Holy Waters Pool And Spa | Juan Rafael Solano | — | (707) 342 2945 | Pool | American Canyon · Napa County | — | — |
| Home Works Home Improvements | Luis Angel Roque | — | (707) 815 2403 | GC, remodel, ADU | Napa · Napa County | — | — |
| Homes West Construction | John Charles Bull | — | (707) 315 1078 | GC, remodel, ADU | Napa · Napa County | — | — |
| Hoss Custom Welding & Fabrication | Hoss Custom Welding & Fabrication | — | (707) 815 3088 | Other | Napa · Napa County | — | — |
| Housemaster Serving Bay Area | Housemaster Serving Bay Area | — | (925) 844-1042 | Inspectors | Brentwood · Napa County | — | — |
| Hovan Pest Control | Hovan Pest Control | — | (707) 294-2786 | Pest, tile roofs | Napa · Napa County | — | — |
| Howard Stockwell | Howard Stockwell | — | (707) 287 5774 | GC, remodel, ADU | Napa · Napa County | — | — |
| Huckfeldt Well Drilling INC | Matthew Kenneth Malinowski | — | (707) 255 7923 | Other | Napa · Napa County | — | — |
| Hudak Construction | Jesse Oran Skaggs Hudak | — | (707) 337 2292 | GC, remodel, ADU | Napa · Napa County | — | — |
| Hugo's Painting Company Contractor | Hugo Rolando Jr Oxlaj Vicente | — | (415) 305 6753 | Windows, patio, painters | American Canyon · Napa County | — | — |
| Hurst Firewood INC | Bruce Allen Hurst | micah@micahrich.com | (707) 554 3062 | Tree | Napa · Napa County | — | — |
| Hurtado Painting And Decorating | Hurtado Painting And Decorating | — | (707) 815 7378 | Windows, patio, painters | Napa · Napa County | — | — |
| Hyatt Electric Co | Hyatt Electric Co | — | (707) 226-7800 | Electricians | Napa · Napa County | — | — |
| Hydros Agritech INC | Christopher Richard Ott | — | (707) 337 5533 | Other | Napa · Napa County | — | — |
| I G Enterprises | Jeffery Wayne Egbert | — | (707) 647 1758 | Electricians | American Canyon · Napa County | — | — |
| I Munoz Appliance Installation | I Munoz Appliance Installation | — | (510) 376 7449 | Other | American Canyon · Napa County | — | — |
| Ian A Neilson Construction Services | Ian Andrew Neilson | — | (707) 477 6241 | GC, remodel, ADU | Napa · Napa County | — | — |
| Iconic Painting | Iconic Painting | — | (707) 850 0123 | Windows, patio, painters | Napa · Napa County | — | — |
| Imboden Pump | Christine Renee Mealey | — | (707) 226 7263 | Other | Napa · Napa County | — | — |
| In Service Builders INC | John Gauge | info@inservicebuilders.com | (707) 250 7930 | GC, remodel, ADU | American Canyon · Napa County | — | — |
| Inferno Guard Home Hardening & Defense Clearing | Jacob John Songer | — | (707) 477 8946 | GC, remodel, ADU | Napa · Napa County | — | — |
| Innovation Builder And Construction | James Adams Hardister | — | (707) 304 4236 | GC, remodel, ADU | Napa · Napa County | — | — |
| Innovative Glass Solutions INC | Robert George Jr Kurucz | — | (707) 637 4447 | Windows, patio, painters | Napa · Napa County | — | — |
| Insegna INC | Anthony Giannetto | insegna@bigpond.com | (707) 312 1262 | GC, remodel, ADU | Napa · Napa County | — | — |
| Instyle Windows Coverings | Instyle Windows Coverings | — | (415) 328 1090 | Other | American Canyon · Napa County | — | — |
| Integrity Sheet Metal | Integrity Sheet Metal | — | (707) 225 7069 | HVAC | Napa · Napa County | — | — |
| Intempus Property Management | Intempus Property Management | — | (844) 448-2247 | Property managers | Napa · Napa County | — | — |
| Iron Age Concrete | Iron Age Concrete | — | (707) 639 0710 | Other | Napa · Napa County | — | — |
| Ironside Construction INC | Brian Eric Krueger | — | (707) 815 7179 | GC, remodel, ADU | Napa · Napa County | — | — |
| Ivan Joaquin Ledesma | Ivan Joaquin Ledesma | — | (707) 812 8409 | Other | Napa · Napa County | — | — |
| Izar Construction INC | Bejhan Paul Razi | — | (707) 226 3995 | GC, remodel, ADU | Napa · Napa County | — | — |