| Diamond Valley Countertops | Diamond Valley Countertops | — | (951) 288 0405 | Other | Hemet · Riverside County | — | — |
| Diamond Valley Garage Door INC | Brian William Beeghly | — | (951) 834 4394 | Other | Murrieta · Riverside County | — | — |
| Diamond W Excavating | Paula Jean Willette | — | (951) 323 3103 | GC, remodel, ADU | Wildomar · Riverside County | — | — |
| Diamond Way Painting | Diamond Way Painting | — | (840) 209 5764 | Windows, patio, painters | Perris · Riverside County | — | — |
| Diamond West Construction | Jeffrey Norman Horne | — | (951) 906 2774 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Diamondback Tile & Stone INC | Ismael Jesus Cerezo | — | (951) 287 8097 | Other | Perris · Riverside County | — | — |
| Diaz Demolition INC | Andres Tapia Diaz | — | (626) 786 2682 | Other | Norco · Riverside County | — | — |
| Diaz Drywall 365 | Luis Gerardo Diaz Ochoa | — | (760) 899 1966 | Other | Indio · Riverside County | — | — |
| Diaz Electric | Moises Josue Diaz | anapbm@gmail.com | (562) 743 7636 | Electricians | Murrieta · Riverside County | — | — |
| Diaz Field Services Engineering And Testing | Tapia Albersandrio Diaz | — | (562) 396 8687 | GC, remodel, ADU | Moreno Valley · Riverside County | — | — |
| Diaz Painting And Custom Finishes | Diaz Painting And Custom Finishes | — | (760) 863 9779 | Windows, patio, painters | Palm Desert · Riverside County | — | — |
| Diaz Pools Plastering | Diaz Pools Plastering | — | (760) 398 8764 | Pool | Coachella · Riverside County | — | — |
| Diaz Pro Velocity A/c & Heating | Diaz Andrew | — | (951) 824 0822 | HVAC | Moreno Valley · Riverside County | — | — |
| Dice It Up Concrete Cutting & Demolition | Marbella G Luna | — | (951) 261 4133 | Other | Corona · Riverside County | — | — |
| Dicecca5 INC DBA Aquablue Pool & Spa Service | Gregory Gilbert Di Cecca | — | (909) 821 5972 | Pool | Banning · Riverside County | — | — |
| Dickinson Landscape Design | Dickinson Landscape Design | — | (909) 242 4999 | Windows, patio, painters | Calimesa · Riverside County | — | — |
| Dicore Concrete Cutting Services | Christopher Richard Dickinson | — | (909) 725 2464 | Other | Murrieta · Riverside County | — | — |
| Didonna Awning Services | Didonna Natale | — | (951) 757 7149 | Other | Winchester · Riverside County | — | — |
| Dig Dug Underground INC | Leif Thomas Swenson | — | (909) 841 4657 | Other | Moreno Valley · Riverside County | — | — |
| Digicom-networks INC | Phramany Ty | — | (951) 445 5177 | Other | Corona · Riverside County | — | — |
| Digital Integration | Digital Integration | — | (760) 772 4100 | Other | Palm Desert · Riverside County | — | — |
| Diligent Engineering | Jose Ramon Jr Cardona | — | (760) 625 9156 | Other | Coachella · Riverside County | — | — |
| Dillard Painting | Dillard Painting | — | (909) 440 7173 | Windows, patio, painters | Beaumont · Riverside County | — | — |
| Dimarco Plastering Specialist | Marco Ibarra | — | (951) 448 0881 | Other | Corona · Riverside County | — | — |
| Dimas Leonel Hernandez | Dimas Leonel Hernandez | — | (626) 977 9897 | GC, remodel, ADU | Jurupa Valley · Riverside County | — | — |
| Dinghao Constructions INC | Wenjia Liu | — | (626) 609 8605 | GC, remodel, ADU | Eastvale · Riverside County | — | — |
| Dinnyes Plumbing | Dinnyes Plumbing | — | (951) 692 0281 | Other | Anza · Riverside County | — | — |
| Dinsmore Quality Painting | Dinsmore Quality Painting | — | (760) 896 8410 | Windows, patio, painters | Palm Desert · Riverside County | — | — |
| Diomara Luxury Flooring | Diomara Luxury Flooring | — | (626) 552 1412 | Other | Lake Elsinore · Riverside County | — | — |
| Direct AC INC | Jason Daniel Friend | — | (951) 742 8222 | HVAC | Riverside · Riverside County | — | — |
| Direct Connection Plumbing | Direct Connection Plumbing | — | (800) 970 5885 | Other | Perris · Riverside County | — | — |
| Direct Current Electric INC | Tyler William Neff | — | (951) 722 7603 | Electricians | Winchester · Riverside County | — | — |
| Direct Electric Company | Jonathan Dean Large | sales@directelectric.com | (951) 200 5262 | Electricians | Murrieta · Riverside County | — | — |
| Direct Leak Detection | Direct Leak Detection | — | (909) 260 2936 | Other | Jurupa Valley · Riverside County | — | — |
| Direct Plumbing & Drains INC | Jerald Ii Garcia | — | (951) 552 5396 | HVAC | Aguanga · Riverside County | — | — |
| Dirt Demo & Disposal Corporation | Victor Harold Jr Ammons | — | (619) 820 0177 | Other | Canyon Lake · Riverside County | — | — |
| Dirt Monkey Engineering | Dirt Monkey Engineering | — | (760) 565 8723 | Other | Palm Desert · Riverside County | — | — |
| Discount Floors INC | Victor Manuel Paredes | — | (951) 354 6062 | Other | Riverside · Riverside County | — | — |
| Discount Hauling & Clean Up Service | Julio Cesar Bustos | — | (951) 245 6444 | Other | Lake Elsinore · Riverside County | — | — |
| Discount Tree Care INC | Gerardo Davila | — | (951) 809 7017 | Tree | Beaumont · Riverside County | — | — |