| Jtb Contracting INC | Jennifer Marie Badillo | — | (619) 571 7231 | Electricians | Temecula · Riverside County | — | — |
| Jte Electrical Contracting INC | James Magdaleno Torres | — | (951) 536 2337 | Electricians | Calimesa · Riverside County | — | — |
| Jth Construction INC | Brian Keith Ollier | — | (951) 741 2270 | GC, remodel, ADU | Temecula · Riverside County | — | — |
| Jtm Pipeline | Jtm Pipeline | — | (951) 836 0897 | Other | Riverside · Riverside County | — | — |
| Jtt General Construction | John Thomas Teed | — | (310) 463 8799 | GC, remodel, ADU | Corona · Riverside County | — | — |
| Juaane's Portable Welding INC | George Enrique Andrade | — | (714) 397 9773 | Other | Norco · Riverside County | — | — |
| Juan Carlos Calderon | Juan Carlos Calderon | — | (760) 340 3679 | Other | Palm Desert · Riverside County | — | — |
| Juan Carlos Salazar | Juan Carlos Salazar | — | (951) 210 2186 | GC, remodel, ADU | Blythe · Riverside County | — | — |
| Juan D Ramos | Juan D Ramos | — | (951) 990 7790 | Other | Moreno Valley · Riverside County | — | — |
| Juan Fernando Diaz Nava | Juan Fernando Diaz Nava | — | (714) 489 7822 | Other | Corona · Riverside County | — | — |
| Juan Gabriel Morales | Juan Gabriel Morales | — | (760) 469 7320 | Electricians | Indio · Riverside County | — | — |
| Juan Jose Camarena | Juan Jose Camarena | — | (951) 232 8030 | Windows, patio, painters | Norco · Riverside County | — | — |
| Juan Jose Rodarte | Juan Jose Rodarte | — | (951) 515 0749 | Other | Riverside · Riverside County | — | — |
| Juan Larios | Juan Larios | — | (760) 340 9711 | Windows, patio, painters | Palm Desert · Riverside County | — | — |
| Juan Martin Ramirez | Juan Martin Ramirez | — | (909) 261 5868 | Windows, patio, painters | Corona · Riverside County | — | — |
| Juan Martinez | Juan Martinez | — | (951) 254 1281 | Other | Corona · Riverside County | — | — |
| Juan P Sanchez | Juan P Sanchez | — | (951) 207 8957 | Other roofers | Riverside · Riverside County | — | — |
| Juan Pedro Duran | Juan Pedro Duran | — | (760) 296 8686 | GC, remodel, ADU | Indio · Riverside County | — | — |
| Juan Pena | Juan Pena | — | (951) 961 7065 | Other | Moreno Valley · Riverside County | — | — |
| Juan Refugio Vital Calderon | Juan Refugio Vital Calderon | — | (760) 831 7054 | GC, remodel, ADU | Thousand Palms · Riverside County | — | — |
| Juan Rodriguez | Juan Rodriguez | — | (760) 625 1300 | Windows, patio, painters | Indio · Riverside County | — | — |
| Juan Sanchez | Juan Sanchez | — | (562) 619 7199 | GC, remodel, ADU | Desert Hot Springs · Riverside County | — | — |
| Juan Sandoval DBA Dirty Hands Services | Juan Manuel Sandoval | — | (310) 617 8301 | Windows, patio, painters | Lake Elsinore · Riverside County | — | — |
| Juarez Beltran Concrete | Juarez Beltran Concrete | — | (951) 623 7380 | Other | Menifee · Riverside County | — | — |
| Juarez Construction Collective INC | Antonio Iii Juarez | — | (760) 989 0094 | GC, remodel, ADU | Coachella · Riverside County | — | — |
| Juarez Grading | Juarez Grading | — | (760) 413 0180 | Other | La Quinta · Riverside County | — | — |
| Jules J Berck | Jules J Berck | — | (951) 699 1010 | HVAC | Hemet · Riverside County | — | — |
| Julian Paul Hernandez | Julian Paul Hernandez | — | (760) 422 9267 | Other | Palm Springs · Riverside County | — | — |
| Julian Rodriguez | Julian Rodriguez | — | (714) 737 0262 | Other | Lake Elsinore · Riverside County | — | — |
| Julio Cesar Delgado Aranda | Julio Cesar Delgado Aranda | — | (760) 969 8517 | Windows, patio, painters | Indio · Riverside County | — | — |
| Julio Cesar Lua DBA Delta Custom Finishes | Delta Custom Finishes | — | (760) 360 2020 | Windows, patio, painters | Palm Desert · Riverside County | — | — |
| Julio Guadalupe Lopez DBA J-lop Painting Company | Julio Guadalupe Lopez | — | (619) 778 8778 | Windows, patio, painters | Murrieta · Riverside County | — | — |
| Julio's Pool Service LLC | Robert Lawrence Bambusch | — | (760) 376 7977 | Pool | Cathedral City · Riverside County | — | — |
| Julios Economy Plumbing INC | Julio Cesar Guadamuz-arvina | — | (951) 318 3313 | Other | Riverside · Riverside County | — | — |
| Just Another Creation Millwork LLC | Carrie Lynn Macelwee | — | (951) 438 9846 | Other | Perris · Riverside County | — | — |
| Just Doors | Just Doors | — | (951) 201 3988 | GC, remodel, ADU | San Jacinto · Riverside County | — | — |
| Just Floor It Tile & Stone | Cuauhtemoc Manuel Leos | — | (760) 989 6503 | Other | Indio · Riverside County | — | — |
| Just Flooring A Partnership | Karl Peter Ahee | — | (951) 965 4227 | Other | Hemet · Riverside County | — | — |
| Just In Time Electric | Justin Acorda Goodearl | — | (808) 429 3042 | Electricians | Moreno Valley · Riverside County | — | — |
| Just Like New | Just Like New | — | (714) 639 9270 | GC, remodel, ADU | Corona · Riverside County | — | — |