| H&h Construction Services | Geoffrey Ovid Holmes | — | (925) 787 6778 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| H&m Builders U S A INC | Rajesh Sharma | — | (925) 980 4113 | GC, remodel, ADU | San Ramon · Contra Costa County | — | — |
| H&x Construction INC | Genxiang Tan | — | (415) 602 3604 | GC, remodel, ADU | Brentwood · Contra Costa County | — | — |
| H2o Plumbing By Eddie Giffin | H2o Plumbing By Eddie Giffin | — | (925) 250 4637 | Other | Antioch · Contra Costa County | — | — |
| Haber Electric INC | Darryl Joseph Haber | — | (925) 240 9655 | Electricians | Brentwood · Contra Costa County | — | — |
| Habitat And De Vries Landscape Design And Construction | Omar Fuad Khorsheed | — | (925) 575 1250 | Windows, patio, painters | Lafayette · Contra Costa County | — | — |
| Habitat Home Improvement | John Daniel Schroeder | john@habitathomeimprovement.com | (415) 505 3595 | GC, remodel, ADU | El Cerrito · Contra Costa County | — | — |
| Habitat Window + Door Service | Charles Henry Stembridge | — | (925) 286 2973 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Hagenbach Construction | John Patrick Hagenbach | — | (925) 786-2268 | GC, remodel, ADU | Brentwood · Contra Costa County | — | — |
| Hai's Roofing Company | Hai Quoc Nguyen | impallari@gmail.com | (415) 309 5720 | Other roofers | El Cerrito · Contra Costa County | — | — |
| Haley Electric INC | Lance Thadon Haley | — | (415) 933 0649 | Electricians | Antioch · Contra Costa County | — | — |
| Hall's Electric LLC | Richard Charles Hall | — | (510) 377 9415 | Electricians | Antioch · Contra Costa County | — | — |
| Hallmark Flooring | Hallmark Flooring | — | (925) 332 8676 | Other | Concord · Contra Costa County | — | — |
| Halsey Construction LLC | Erik Scott Halsey | — | (510) 909 6358 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Ham Remodeling | Ham Remodeling | — | (415) 795 0755 | GC, remodel, ADU | Bay Point · Contra Costa County | — | — |
| Hamblin Electric | Joshua Stanton Hamblin | joshhamblin@hamblinelectric.com | (925) 286 4372 | Electricians | Pleasant Hill · Contra Costa County | — | — |
| Hamilton Construction | George Armstrong Jr Hamilton | loren@hamilton-construction.com | (510) 375 2071 | GC, remodel, ADU | Crockett · Contra Costa County | — | — |
| Hamilton Construction Company | Jerry Daniel Hamilton | loren@hamilton-construction.com | (510) 234 9346 | GC, remodel, ADU | San Pablo · Contra Costa County | — | — |
| Hamilton Electric | Brian Christopher Hamilton | service@hamilton-electric.com | (925) 207 4984 | Electricians | Oakley · Contra Costa County | — | — |
| Hamilton Tree Service INC | Tolbert Grant Hamilton | — | (925) 228 1010 | Windows, patio, painters | Martinez · Contra Costa County | — | — |
| Hammer's Heating And Air Conditioning | Hammer's Heating And Air Conditioning | — | (925) 229 2779 | HVAC | Martinez · Contra Costa County | — | — |
| Han Smith Construction LLC | Donald Edward Smith | — | (510) 306 2538 | GC, remodel, ADU | El Cerrito · Contra Costa County | — | — |
| Hance Wood Renewal | Gregory Harold Overfield | — | (925) 820 1019 | Other | San Ramon · Contra Costa County | — | — |
| Handlin 'it Plumbing | Handlin 'it Plumbing | — | (925) 457 5633 | Other | Antioch · Contra Costa County | — | — |
| Handydads Construction | Adam Daniel Martinez | — | (925) 587 3237 | GC, remodel, ADU | Brentwood · Contra Costa County | — | — |
| Handymarin Construction INC | John Jairo Marin Rivera | — | (727) 317 7985 | GC, remodel, ADU | Pleasant Hill · Contra Costa County | — | — |
| Hang Kee Min | Hang Kee Min | — | (925) 381 8753 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Hannah Construction | Bradley Robert Hannah | — | (925) 999 6370 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Hansen Electric | Michael Glen Hansen | — | (510) 290 5090 | Electricians | Pinole · Contra Costa County | — | — |
| Hanshaw Construction | Shawn Douglas Hanshaw | — | (925) 915 4778 | GC, remodel, ADU | Danville · Contra Costa County | — | — |
| Hanson Electrical Contractor | Hanson Hsueh Cheng Lee | — | (510) 529 5468 | Electricians | Richmond · Contra Costa County | — | — |
| Happy Dave's Floor Covering Service | David Francis Russell | — | (925) 301 6267 | Other | Discovery Bay · Contra Costa County | — | — |
| Happy Home Repairs INC | Stephen James Cellini | — | (925) 708 7166 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Happy Place Builders INC | Miguel Angel Funes Funes | — | (415) 573 9546 | GC, remodel, ADU | Richmond · Contra Costa County | — | — |
| Harabuilt Construction | Eric James Hara | — | (925) 451 4985 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Hardwood Flooring Experts Co INC | Ruben Omar Vazquez Arias | — | (925) 752 3723 | Other | Oakley · Contra Costa County | — | — |
| Hardwood Floors By Jonathan Gayer LLC | Jonathan Gayer | — | (925) 235 1222 | Other | Walnut Creek · Contra Costa County | — | — |
| Harold L Williams Welding Company | Harold L Williams | — | (925) 518 5885 | Other | Oakley · Contra Costa County | — | — |
| Harold Painting | Harold Painting | — | (415) 955 7665 | Windows, patio, painters | Antioch · Contra Costa County | — | — |
| Harrison Industrial Services INC | Michael Harrison Clement | — | (888) 212 6095 | GC, remodel, ADU | Antioch · Contra Costa County | — | — |