| De Witte Construction INC | Wade Elliotte Harvey | office@dewitteconstruction.com | (760) 773 4764 | GC, remodel, ADU | La Quinta · Riverside County | — | — |
| Dean Custom Systems | Michael Glenn Dean | — | (760) 285 8848 | Other | Indio · Riverside County | — | — |
| Dean M Andrews | Dean M Andrews | — | (951) 278 1254 | HVAC | Corona · Riverside County | — | — |
| Dean Press Construction | Dean Shafer Press | — | (760) 525 5162 | GC, remodel, ADU | Cathedral City · Riverside County | — | — |
| Dean R Barker | Dean R Barker | — | (914) 454 0549 | Pool | Temecula · Riverside County | — | — |
| Dean Rainbolt's Custom Weatherstripping | Dean Rainbolt's Custom Weatherstripping | — | (951) 735 2119 | Other | Riverside · Riverside County | — | — |
| Dean Schuman Installation Services | Dean Jacob Schuman | — | (760) 272 0952 | Other | Palm Desert · Riverside County | — | — |
| Dean's Construction | Dianna Rachelle Dean | — | (951) 255 2621 | GC, remodel, ADU | Perris · Riverside County | — | — |
| Dean's Electric | Cory Allen Dean | — | (951) 522 6621 | Electricians | Riverside · Riverside County | — | — |
| Dean's Engineering | Carolyn Sue Dean | — | (951) 676 0242 | Other | Temecula · Riverside County | — | — |
| Dearmond Construction INC | Terry Lee De Armond | — | (909) 730 0509 | GC, remodel, ADU | Temecula · Riverside County | — | — |
| Debra Gayle Designs | Debra Gayle Designs | — | (951) 265 0781 | Windows, patio, painters | Temecula · Riverside County | — | — |
| Debra Rodriguez DBA Rodriguez Custom Painting | Rodriguez Custom Painting | — | (951) 590 2913 | Windows, patio, painters | San Jacinto · Riverside County | — | — |
| Deckrete Concrete Resurfacing INC | Victor Jose Castellon | — | (714) 376 2579 | Other | Nuevo · Riverside County | — | — |
| Deco Air Conditioning And Heating | Deco Air Conditioning And Heating | — | (951) 347 8440 | HVAC | Riverside · Riverside County | — | — |
| Decor Electric INC | Vernon Lee Dittloff | — | (949) 586 5025 | Electricians | Murrieta · Riverside County | — | — |
| Decorative Iron Corporation | Kurt Lawrence Boer | — | (951) 852 8816 | Other | Canyon Lake · Riverside County | — | — |
| Decorators Depot Diversified Interiors | David Eric Scott | — | (760) 773 4953 | GC, remodel, ADU | Rancho Mirage · Riverside County | — | — |
| Dedicated Concrete Cutting | Dedicated Concrete Cutting | — | (626) 512 7657 | Other | Riverside · Riverside County | — | — |
| Deeco Power Solutions LLC | Ryan Patrick Dee | — | (951) 837 3333 | Electricians | Murrieta · Riverside County | — | — |
| Defense Electric Corporation | Steven James Nieburger | jeff@defenseelectric.com | (951) 966 0065 | Electricians | Moreno Valley · Riverside County | — | — |
| Definitive Plumbing Solutions | Definitive Plumbing Solutions | — | (949) 542 2707 | Other | Perris · Riverside County | — | — |
| Deforest Construction INC | Michele Rae Sullivan | — | (951) 359 3710 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Degante Electric | Francisco Javier Degante | — | (951) 287 0413 | Electricians | Hemet · Riverside County | — | — |
| Deguire Weed Abatement INC | Matthew George Swoboda | — | (951) 741 4790 | Tree | Riverside · Riverside County | — | — |
| Deh Mechanical Company INC | Thomas Dillon Powers | — | (760) 346 5354 | HVAC | Palm Desert · Riverside County | — | — |
| Dehlinger Enterprises INC DBA American Real Estate Services | Steven Leroy Dehlinger | — | (951) 522 9478 | GC, remodel, ADU | Murrieta · Riverside County | — | — |
| Dei Filius Welding | Dei Filius Welding | — | (951) 399 8557 | Other | Riverside · Riverside County | — | — |
| Dei Telecommunication Services INC | Grant Lee Jr Dismuke | — | (505) 341 4344 | Other | Riverside · Riverside County | — | — |
| Deike Construction Company | Thomas Walter Deike | — | (951) 203 5484 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Del Jd Tile INC | Delgadillo Jorge | — | (951) 634 8001 | Other | Hemet · Riverside County | — | — |
| Del Real Tree Service LLC | Maria Guadalupe Del Real | — | (626) 412 6498 | Tree | Banning · Riverside County | — | — |
| Del Rey Electric INC | Melvyn Charles Smyth | — | (818) 519 2044 | Electricians | Palm Springs · Riverside County | — | — |
| Del Rio Co | Andrew Lloyd Mullins | — | (951) 757 8509 | Other | Homeland · Riverside County | — | — |
| Del Rio Ornamental Iron | Del Rio Ornamental Iron | — | (951) 206 8702 | Other | Moreno Valley · Riverside County | — | — |
| Del Toro Maintenance | Victor Manuel Del Toro | — | (562) 743 9080 | GC, remodel, ADU | Murrieta · Riverside County | — | — |
| Del's Construction | Luis Esparza Diaz | — | (949) 510 9998 | GC, remodel, ADU | Corona · Riverside County | — | — |
| Del's Flooring Contractors INC | Anthony Jay Bernardi | — | (760) 568 0060 | Other | Palm Desert · Riverside County | — | — |
| Del's Plumbing Co | Delgado Louis | — | (951) 202 8946 | Other | Mira Loma · Riverside County | — | — |
| Delafuente Excavation INC | Albert Richard Delafuente | — | (951) 642 0103 | Other | Riverside · Riverside County | — | — |