| Hughes Landscaping | Hughes Landscaping | — | (209) 848 1363 | Windows, patio, painters | Oakdale · Stanislaus County | — | — |
| Hughson Air HVAC INC | Martin Fernando Duran | — | (209) 595 3540 | HVAC | Hughson · Stanislaus County | — | — |
| Hugon Construction | Jerry Lee Hughes | — | (209) 491 2620 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| Hulburt Painting INC | Thomas Clyde Pawloski | — | (510) 599 0097 | Windows, patio, painters | Modesto · Stanislaus County | — | — |
| Humphrey Plumbing INC | Alejandro Velazquez | — | (209) 634 4626 | Other | Turlock · Stanislaus County | — | — |
| Hunt Equipment LLC | Miguel Ramon Jr Flores | — | (209) 537 9396 | Other | Ceres · Stanislaus County | — | — |
| Huntington Construction Co | Jered Timothy Huntington | — | (209) 531 5406 | Electricians | Modesto · Stanislaus County | — | — |
| Hunts Construction Partnership | Bonnie Jane Jackson | — | (408) 858 7007 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| Hutton Lovewell INC | David Wayne Hutton | — | (209) 527 8436 | Windows, patio, painters | Modesto · Stanislaus County | — | — |
| HVAC Living | HVAC Living | — | (209) 496 4323 | HVAC | Ceres · Stanislaus County | — | — |
| HVAC Penguin | HVAC Penguin | eric@hvacpenguin.com | (209) 595 9367 | HVAC | Turlock · Stanislaus County | — | — |
| Hvacrmedic INC | Scott Adam Selesnick | sselesnick@hvacrmedic.com | (209) 507 2510 | HVAC | Modesto · Stanislaus County | — | — |
| Hydro Pros | Roger Gene Bonham | — | (800) 921 1177 | Other | Modesto · Stanislaus County | — | — |
| I - Roof | Josue Leonardo Ovando | — | (209) 505 2751 | Other roofers | Modesto · Stanislaus County | — | — |
| I C Electronics INC | Donald Joseph Facha | — | (209) 529 7684 | Electricians | Modesto · Stanislaus County | — | — |
| I C Refrigeration Service INC | Tracey Maureen Buck | — | (209) 538 8271 | HVAC | Ceres · Stanislaus County | — | — |
| I G Y 6 Electric | Mendoza Gusmaro | — | (209) 380 4156 | Electricians | Turlock · Stanislaus County | — | — |
| I J Larsen Pumps INC | Vickie Chaney Humble | — | (209) 529 2020 | Other | Modesto · Stanislaus County | — | — |
| I Q Building And Engineering INC | Linda Ann Miceli | — | (209) 345 6357 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| I Q Plumbing & Rooter INC | Rangel Isaac Quiroz | — | (209) 404 1383 | Other | Modesto · Stanislaus County | — | — |
| Ibarra's Painting | Ibarra's Painting | — | (209) 534 5755 | Windows, patio, painters | Riverbank · Stanislaus County | — | — |
| Icr-cal Electric INC | Loera Calev Arellano | — | (209) 595 7351 | Electricians | Modesto · Stanislaus County | — | — |
| Idiaz Masonry | Isaias Eudes Diaz Soy | idiazmasonry@gmail.com | (209) 872 6065 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| Ignacio's Mobile Home Service | Ignacio Ocano Parra | — | (408) 621 2106 | Other | Hughson · Stanislaus County | — | — |
| Igr Landscape LLC | Gutierrez Ramos Ignacio | — | (209) 345 4471 | Windows, patio, painters | Modesto · Stanislaus County | — | — |
| Ike's Appliance And Associates | Isaac Kweku Essuman | — | (209) 667 1320 | HVAC | Turlock · Stanislaus County | — | — |
| Impact Electric | Mark Wilbert Fullard | — | (209) 262 8193 | Electricians | Modesto · Stanislaus County | — | — |
| Impact Painting | Impact Painting | — | (209) 605 6551 | Windows, patio, painters | Ceres · Stanislaus County | — | — |
| Impact Pro Refinishing LLC | Luis Alfredo Cortez Alonzo | — | (877) 530 7767 | Windows, patio, painters | Ceres · Stanislaus County | — | — |
| Imperial Construction | Daniel Alfred Irby | — | (209) 346 3589 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| Imperial West Roofing INC | Lozano J Jesus Lozano | — | (510) 506 1727 | Other roofers | Modesto · Stanislaus County | — | — |
| Implement Construction INC | Lonnie Gene Beireis | — | (209) 312 5967 | GC, remodel, ADU | Oakdale · Stanislaus County | — | — |
| Inderjit S Toor Construction | Inderjit Singh Toor | — | (209) 538 4040 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| Industrial Electrical Co | David Lester Howell | — | (209) 527 2800 | Electricians | Modesto · Stanislaus County | — | — |
| Industrial Pipe Solutions INC | Anthony Wayne Ii Dumlao | — | (209) 327 1753 | Other | Patterson · Stanislaus County | — | — |
| Industrial Piping Co | Jeffrey Richard Otto | admin@ipspiping.com | (209) 988 1817 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| Industrial Refrigeration And Control | Industrial Refrigeration And Control | — | (209) 988 2678 | HVAC | Modesto · Stanislaus County | — | — |
| Industrial Services & Welding INC | Jovany Artemio Ponce | — | (209) 398 1987 | Other | Turlock · Stanislaus County | — | — |
| Infinite Electric & HVAC | Theodore Price Burns | — | (209) 484 9042 | HVAC | Hughson · Stanislaus County | — | — |
| Infinity Insulation | Infinity Insulation | — | (650) 862 7215 | Other | Modesto · Stanislaus County | — | — |