| J C R Tile & Stone | Almodovar Susana | — | (760) 343 5081 | Other | Thousand Palms · Riverside County | — | — |
| J C Scaffold Services | Jaime Antonio Carranza | — | (951) 777 1222 | Other | Riverside · Riverside County | — | — |
| J C T Coatings INC | Juan Carlos Tapia-Madrigal | — | (562) 446 5640 | Windows, patio, painters | Moreno Valley · Riverside County | — | — |
| J C Welding Co | Julio Cesar Perla | — | (951) 941 1474 | Other | Riverside · Riverside County | — | — |
| J C Well & Pump Systems INC | Jose Bulmaro Cruz | — | (760) 469 7508 | Other | Thermal · Riverside County | — | — |
| J C Wright Construction INC | Bob Stanley Wright | — | (951) 867 8224 | GC, remodel, ADU | Indio · Riverside County | — | — |
| J Cab Electric | Jimmy Ray Cabrales | — | (951) 403 3283 | Electricians | Corona · Riverside County | — | — |
| J Carey Construction | Justin Walter Carey | — | (909) 283 5756 | GC, remodel, ADU | Wildomar · Riverside County | — | — |
| J Castellon Construction | Juan Castellon Mejia | — | (951) 202 4858 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| J Cesare | J Cesare | — | (760) 250 8600 | GC, remodel, ADU | Rancho Mirage · Riverside County | — | — |
| J Co Contracting & Renovation INC | Jose Carlos Oregel | — | (909) 316 4011 | GC, remodel, ADU | Calimesa · Riverside County | — | — |
| J D Burns | J D Burns | — | (714) 742 9752 | Other | Temecula · Riverside County | — | — |
| J D C Electric | Jesse Dylan Campau | — | (951) 858 6584 | Electricians | Riverside · Riverside County | — | — |
| J D Communications INC | Enedino Patino | — | (951) 764 5240 | Other | Hemet · Riverside County | — | — |
| J D Cunningham Custom Painting | J D Cunningham Custom Painting | — | (760) 409 5038 | Windows, patio, painters | Rancho Mirage · Riverside County | — | — |
| J D Electric | Joseph Dante D'alessio | — | (818) 822 9685 | Electricians | Homeland · Riverside County | — | — |
| J D I Construction | Paul Henry Krausman | — | (714) 349 0783 | GC, remodel, ADU | Lake Elsinore · Riverside County | — | — |
| J D I Electrical Solutions INC | James Edward Douglas | — | (951) 657 0100 | Electricians | Temecula · Riverside County | — | — |
| J D L Construction Group | Juan De Dios Lopez Luna | — | (626) 814 7478 | GC, remodel, ADU | Jurupa Valley · Riverside County | — | — |
| J D Landscape | Jose De Jesus Diaz | — | (951) 660 9329 | Windows, patio, painters | Perris · Riverside County | — | — |
| J D Landscape A Partnership | Jose Luis Sr Diaz | — | (760) 574 3347 | GC, remodel, ADU | Indio · Riverside County | — | — |
| J D Landscape Construction | Pierro Girolamo Di | — | (951) 757 2672 | Windows, patio, painters | Wildomar · Riverside County | — | — |
| J D M Construction | Jimmy Daniel Manzanares | — | (951) 818 5058 | GC, remodel, ADU | Canyon Lake · Riverside County | — | — |
| J D O General Construction INC | De Orta Juventino | jesusjdogeneral@gmail.com | (909) 821 3990 | GC, remodel, ADU | Hemet · Riverside County | — | — |
| J D P Electric | John David Perham | jdpinc@jdpelectric.com | (760) 569 8170 | Electricians | Palm Desert · Riverside County | — | — |
| J D R Builder | J D R Builder | — | (760) 844 6224 | GC, remodel, ADU | Coachella · Riverside County | — | — |
| J D Roofing | Valdez Benjamin | — | (951) 350 9056 | Other roofers | San Jacinto · Riverside County | — | — |
| J D Woodcraft | J D Woodcraft | — | (626) 506 5467 | Other | Riverside · Riverside County | — | — |
| J Day Painting | J Day Painting | — | (949) 244 4598 | Windows, patio, painters | Riverside · Riverside County | — | — |
| J Derman Electric | Derman Jacob | — | (760) 799 7711 | Electricians | Cathedral City · Riverside County | — | — |
| J E G Electrical | Jorge Eduardo Gomez | — | (951) 591 4794 | Electricians | Homeland · Riverside County | — | — |
| J E T Properties INC | Eben Anderson George | — | (760) 408 8184 | GC, remodel, ADU | Palm Desert · Riverside County | — | — |
| J Francis Company | Diana Marie Hanna | — | (951) 776 9100 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| J G C M Plumbing LLC | Juan Antonio Martinez | — | (951) 349 5141 | Other | Perris · Riverside County | — | — |
| J G I Construction | Juan Carlos Campos Betancourt | — | (951) 322 9141 | GC, remodel, ADU | Nuevo · Riverside County | — | — |
| J G Landscaping INC | Jimenez Juan Gonzalez | — | (909) 684 6494 | Windows, patio, painters | Beaumont · Riverside County | — | — |
| J G Mechanical | J G Mechanical | — | (760) 671 3027 | HVAC | Desert Hot Springs · Riverside County | — | — |
| J G Painting | J G Painting | — | (714) 643 4956 | Windows, patio, painters | Riverside · Riverside County | — | — |
| J G Painting | J G Painting | — | (951) 530 6061 | Windows, patio, painters | Perris · Riverside County | — | — |
| J G Pro Tile | Garcia Javier Rangel | — | (951) 537 7319 | Other | Hemet · Riverside County | — | — |