| Harris General Engineering INC | Michael Joseph Harris | — | (707) 889 2671 | Other | Penngrove · Sonoma County | — | — |
| Hart Construction | Christopher Robert Hart | — | (415) 312 3202 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Hart Construction | Hart Robert | — | (707) 887 9777 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| Hart Electric | Christopher Paxton Hart | — | (240) 676 0709 | Electricians | Rohnert Park · Sonoma County | — | — |
| Hartley Window Coverings INC | Michael Bryon Hartley | info@hartleywindowcoverings.com | (707) 525 8256 | Other | Santa Rosa · Sonoma County | — | — |
| Hartmann Construction | Eric Joseph Hartmann | — | (415) 497 7587 | GC, remodel, ADU | Sonoma · Sonoma County | — | — |
| Hartnett Construction | Hartnett Sid | — | (415) 816 5046 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| Harvest Electric Company INC | Timothy Ashford Pinney | — | (707) 738 8896 | Electricians | Santa Rosa · Sonoma County | — | — |
| Harvest Moon | Harvest Moon | — | (707) 321 1810 | GC, remodel, ADU | Sonoma · Sonoma County | — | — |
| Harvey Lee Whitehill Iii | Harvey Lee Whitehill Iii | — | (707) 935 1510 | Windows, patio, painters | Vineburg · Sonoma County | — | — |
| Hauer Construction & Maintenance | Edwin Frederick Hauer | — | (415) 725 1036 | GC, remodel, ADU | Windsor · Sonoma County | — | — |
| Haught General Construction | Adam Stephen Haught | — | (707) 331 9427 | GC, remodel, ADU | Annapolis · Sonoma County | — | — |
| Hawkins Construction | James Philip Hawkins | — | (415) 306 3194 | GC, remodel, ADU | Villa Grande · Sonoma County | — | — |
| Hawkins Group INC | Kendall Bruce Hawkins | — | (808) 387 6129 | GC, remodel, ADU | Vineburg · Sonoma County | — | — |
| Hayman Refrigeration & Air Conditioning | Hayman Refrigeration & Air Conditioning | — | (707) 953 0913 | HVAC | Windsor · Sonoma County | — | — |
| Hcb Construction | Michael A Reynolds | — | (707) 774 9068 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Heacock Construction | Brian John Heacock | — | (707) 478 1006 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| Head Tide Millworks | Head Tide Millworks | — | (707) 397 0203 | Other | Healdsburg · Sonoma County | — | — |
| Healdsburg Drywall INC | George Luis Nieto | healdsburgdrywall@yahoo.com | (707) 321 3982 | Other | Healdsburg · Sonoma County | — | — |
| Healdsburg Floor Coverings INC | Travis Brennan Diebold | — | (707) 433 8008 | Other | Healdsburg · Sonoma County | — | — |
| Healdsburg Lumber Company INC | Jill Ziedrich Gaylor | — | (707) 431 9663 | GC, remodel, ADU | Healdsburg · Sonoma County | — | — |
| Healdsburg Plumbing | Healdsburg Plumbing | — | (707) 696 3484 | Other | Healdsburg · Sonoma County | — | — |
| Healdsburg Pool Service | Mark Andrew Gren | — | (707) 433 6451 | Pool | Healdsburg · Sonoma County | — | — |
| Healdsburg Property Management | Healdsburg Property Management | — | (707) 433-8899 | Property managers | Healdsburg · Sonoma County | — | — |
| Healdsburg Signs INC | James Bernard Lago | — | (707) 433 7446 | Other | Healdsburg · Sonoma County | — | — |
| Healing Comfort Heating Air & Plumbing | Leopoldo James Garcia | — | (707) 931 8777 | HVAC | Sonoma · Sonoma County | — | — |
| Heartwood | Steven Francis Hood | — | (925) 289 6471 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Heaven On Earth Landscape Construction | Anthony Baring Reate | — | (408) 507 1086 | Windows, patio, painters | Sonoma · Sonoma County | — | — |
| Heavy Gear Enterprises | Steven Allen Pearson | — | (707) 529 4426 | Other | Forestville · Sonoma County | — | — |
| Heavyweight Concrete INC | Sergio Alvarez | — | (415) 342 3926 | Other | Rohnert Park · Sonoma County | — | — |
| Hegarty Construction INC | Steven Miles Hegarty | — | (707) 303 6961 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Heinse Builders | Heinse Builders | heinsebuilders@prodigy.net | (707) 318 7798 | GC, remodel, ADU | Rohnert Park · Sonoma County | — | — |
| Henderson Plumbing | Henderson Plumbing | — | (707) 494 7363 | Other | Monte Rio · Sonoma County | — | — |
| Henicle Services | Edward Nelson Henicle | ed.henicle@gmail.com | (707) 953 8058 | HVAC | Santa Rosa · Sonoma County | — | — |
| Henris Roofing Co | Stephen Horace Henris | — | (707) 763 1535 | Other roofers | Petaluma · Sonoma County | — | — |
| Henry Gomez Pool & Spa | Brian James Henry | — | (831) 747 7099 | GC, remodel, ADU | Valley Ford · Sonoma County | — | — |
| Henry Mechanical | Joseph Douglas Henry | — | (707) 838 3311 | HVAC | Windsor · Sonoma County | — | — |
| Henry's Painting | Henry's Painting | — | (707) 480 9258 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Hensley Tile And Natural Stone | Hensley Tile And Natural Stone | — | (415) 819 7989 | Other | Santa Rosa · Sonoma County | — | — |
| Herb Zacks Woodworking | Herb Zacks Woodworking | — | (707) 364 4230 | Other | Penngrove · Sonoma County | — | — |