| Hi-tek Electric INC | Juan Carlos Gonzalez | — | (909) 997 1016 | Electricians | Moreno Valley · Riverside County | — | — |
| Hidalgo Plumbing INC | Anthony Raphael Hidalgo | — | (951) 518 3571 | Other | Moreno Valley · Riverside County | — | — |
| Hidden Hills Construction | Ragheb Ismail Elzein | — | (949) 820 1562 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Hidden Valley Landscapes | Hidden Valley Landscapes | — | (909) 969 8292 | Windows, patio, painters | Wildomar · Riverside County | — | — |
| Hidden Valley Painting | Jacinto Raul Hernandez | — | (951) 544 2697 | Windows, patio, painters | Riverside · Riverside County | — | — |
| High Caliber Electric | Timothy Edward Cook | — | (909) 557 6714 | Electricians | Cherry Valley · Riverside County | — | — |
| High Caliber Heating & Cooling | Casey Alan Schroeder | — | (562) 304 8360 | HVAC | Norco · Riverside County | — | — |
| High Caliber Tile INC | Gino Louis Battista | — | (951) 232 3112 | Other | Winchester · Riverside County | — | — |
| High End Roofing | Hernandez Varela David | — | (760) 818 5223 | Other roofers | Temecula · Riverside County | — | — |
| High Five Windows And Doors INC | Mario Habchi | — | (844) 473 0106 | GC, remodel, ADU | Palm Desert · Riverside County | — | — |
| High Gear Electric | Gonzalez Hugo | highgearelec@gmail.com | (714) 406 8047 | Electricians | Lake Elsinore · Riverside County | — | — |
| High Grade Paint Coatings | High Grade Paint Coatings | — | (760) 660 3666 | Windows, patio, painters | Desert Hot Springs · Riverside County | — | — |
| High Ground Landscaping | Rene Eduardo Chavez | — | (760) 673 9875 | Windows, patio, painters | Coachella · Riverside County | — | — |
| High Limit Steel | High Limit Steel | — | (951) 218 2574 | Other | Perris · Riverside County | — | — |
| High Octane Flooring | High Octane Flooring | — | (951) 520 3197 | Other | Corona · Riverside County | — | — |
| High Performance Air INC | Bryan John Statham | — | (951) 653 0239 | HVAC | Riverside · Riverside County | — | — |
| High Performance Roofing Corporation | Christopher Edward Diaz-Urbalejo | — | (562) 355 3764 | Other roofers | Riverside · Riverside County | — | — |
| High Precision Painting INC | Omar Torres | — | (760) 300 0027 | Windows, patio, painters | Beaumont · Riverside County | — | — |
| High Quality Landscape Construction INC | Leon Alejandro | — | (760) 701 9879 | Windows, patio, painters | Palm Desert · Riverside County | — | — |
| High Tech Electrical Contractor | Juan Francisco Espinoza | — | (760) 272 4565 | Electricians | Indio · Riverside County | — | — |
| High Tech HVAC | High Tech HVAC | — | (559) 515 9711 | HVAC | Murrieta · Riverside County | — | — |
| High Tower Roofing INC | Armando Villegas Duran | — | (951) 446 4444 | Other roofers | Menifee · Riverside County | — | — |
| High Velocity Air INC | Michael Francis Matyja | eben@eyebytes.com | (760) 984 3440 | HVAC | Beaumont · Riverside County | — | — |
| High Voltage Electrical | Jaime Avila Lopez | — | (951) 591 8274 | Electricians | Nuevo · Riverside County | — | — |
| Higher Power Electric | Brian Wayne Senior | — | (951) 755 9906 | Electricians | Beaumont · Riverside County | — | — |
| Higher Power Electrical Contractor | Brian Keith Roberts | — | (949) 257 5717 | Electricians | Menifee · Riverside County | — | — |
| Higher Powers Construction | Samuel Marvin Powers | — | (951) 368 4201 | GC, remodel, ADU | Moreno Valley · Riverside County | — | — |
| Highland Fairview Construction INC | Paul Edward Fierro | — | (951) 489 6871 | Other | Moreno Valley · Riverside County | — | — |
| Highland Floor Covering INC | John David Johnson | info@highlandfloorcovering.com | (951) 693 2254 | GC, remodel, ADU | Temecula · Riverside County | — | — |
| Highlands Construction Group LLC | David Peter Ulrich | — | (949) 610 3287 | GC, remodel, ADU | Temecula · Riverside County | — | — |
| Highlands Electric | Edgar Harrison Iii Craig | — | (951) 818 2680 | Electricians | Temecula · Riverside County | — | — |
| Highridge Landscape INC | Torres Alejandro Hernandez | — | (951) 236 2200 | Windows, patio, painters | Riverside · Riverside County | — | — |
| Higuera Construction | Oscar Alfredo Higuera Perez | — | (760) 469 6074 | GC, remodel, ADU | Indio · Riverside County | — | — |
| Higuera Masonry INC | Eliborio Pena Higuera | — | (760) 578 3680 | Other | Indio · Riverside County | — | — |
| Higuera Pools INC | Yovani Del Rosario Higuera | — | (760) 601 6319 | Pool | Indio · Riverside County | — | — |
| Hill Bc INC | James Francis Hill | — | (951) 278-0377 | GC, remodel, ADU | Temecula · Riverside County | — | — |
| Hill Electric Incorporated | Todd Anthony Hill | — | (760) 772 1770 | Electricians | Palm Desert · Riverside County | — | — |
| Hill King Development | Hill King Development | — | (310) 926 3815 | GC, remodel, ADU | Corona · Riverside County | — | — |
| Hillcrest Contracting INC | James Peter Wong | — | (951) 273 9600 | Other | Corona · Riverside County | — | — |
| Hillman Plumbing | Hillman Plumbing | — | (951) 445 1355 | Other | Temecula · Riverside County | — | — |