| J Reyes Electric INC | Jorge Alberto Reyes | — | (760) 972 6317 | Electricians | Indio · Riverside County | — | — |
| J S Bahr Construction | Jeffrey Scott Bahr | — | (951) 970 6354 | GC, remodel, ADU | Temecula · Riverside County | — | — |
| J S Cabinets | J S Cabinets | — | (760) 698 0204 | GC, remodel, ADU | Beaumont · Riverside County | — | — |
| J S Concrete Const | J S Concrete Const | — | (760) 660 9820 | Other | Desert Hot Springs · Riverside County | — | — |
| J S J Construction Services | Joe Samuel Jones | — | (949) 395 1596 | Electricians | Menifee · Riverside County | — | — |
| J S L Construction | John Stanley Lewis | — | (760) 895 0908 | GC, remodel, ADU | Rancho Mirage · Riverside County | — | — |
| J S Mac Donnell | J S Mac Donnell | — | (626) 945 4730 | GC, remodel, ADU | Indio · Riverside County | — | — |
| J S Perry Construction | Jeremiah Stephen Perry | — | (818) 384 9550 | GC, remodel, ADU | Rancho Mirage · Riverside County | — | — |
| J S Sedgwick Plumbing | J S Sedgwick Plumbing | — | (951) 453 0488 | Other | Riverside · Riverside County | — | — |
| J Serna Painting INC | Juan Enrique Serna Fregoso | — | (760) 844 5360 | Windows, patio, painters | Cathedral City · Riverside County | — | — |
| J Slusher Services | Joseph Michael Slusher | — | (760) 832 6549 | GC, remodel, ADU | Palm Springs · Riverside County | — | — |
| J T Custom Cabinets & Woodworks | Joshua Hugh Tinnin | — | (951) 385 9120 | Other | Menifee · Riverside County | — | — |
| J T Developments And Building Services | James Edward Tapp | — | (714) 271 1621 | GC, remodel, ADU | Norco · Riverside County | — | — |
| J T S Electric | Adrian Peter Buyten | — | (951) 444 1144 | Electricians | Menifee · Riverside County | — | — |
| J T S Excavation | J T S Excavation | — | (909) 815 5509 | Other | Riverside · Riverside County | — | — |
| J T S Plumbing INC | Jason Allen Shier | — | (951) 219 6367 | Other | Temecula · Riverside County | — | — |
| J Talley Corporation DBA Talley Metal Fabrication | Joe Brown Jr Talley | — | (951) 654 2123 | Other | San Jacinto · Riverside County | — | — |
| J Tarantino Jr Construction Co | Stephanie Lynn Tarantino | — | (760) 801 4054 | Other | Aguanga · Riverside County | — | — |
| J Tech Mechanical Services | John Martin Janewicz | — | (951) 536 6445 | HVAC | Riverside · Riverside County | — | — |
| J V D Painting | J V D Painting | — | (951) 406 5545 | Windows, patio, painters | Moreno Valley · Riverside County | — | — |
| J V J Construction Service | Edwin William Garcia | — | (925) 584 0406 | Other | Riverside · Riverside County | — | — |
| J V Quality Drywall Co | Luis Alberto Enciso Peralata | — | (323) 458 2425 | Windows, patio, painters | Moreno Valley · Riverside County | — | — |
| J V S Refrigeration INC | Joseph Van Stephens | cstephens@jvsrefrig.com | (800) 869 8218 | HVAC | Riverside · Riverside County | — | — |
| J W O'neil Construction INC | Jacob William O'neil | — | (951) 401 8174 | GC, remodel, ADU | Temecula · Riverside County | — | — |
| J W P Electric | Joshua Wayne Parmenter | — | (858) 431 9669 | Electricians | Winchester · Riverside County | — | — |
| J W Tile And Stone | J W Tile And Stone | — | (760) 219 4772 | Other | Indio · Riverside County | — | — |
| J Z Electric | Zunzunegui Julio | — | (909) 227 4611 | Electricians | Nuevo · Riverside County | — | — |
| J&b Quality Painting INC | Jorge Martinez | — | (760) 532 6305 | Windows, patio, painters | Wildomar · Riverside County | — | — |
| J&c Painting Generation Corp | Israel Trinidad Jimenez Caballero | — | (951) 263 8280 | Windows, patio, painters | Moreno Valley · Riverside County | — | — |
| J&c Refrigeration | Johnny Michael Saniz | — | (951) 239 8592 | HVAC | Corona · Riverside County | — | — |
| J&d Construction | Jorge Arturo Perez Alvarez | — | (909) 419 6363 | GC, remodel, ADU | Palm Desert · Riverside County | — | — |
| J&g Plumbing Repipe Specialist INC | Jose Francisco Arreola | — | (562) 335 7578 | Other | Moreno Valley · Riverside County | — | — |
| J&h General Construction | Herrera Jesus Viramontes | — | (951) 258 9635 | GC, remodel, ADU | Corona · Riverside County | — | — |
| J&h Total Construction Corporation | Jeremy Trevor Young | — | (760) 902 6261 | GC, remodel, ADU | La Quinta · Riverside County | — | — |
| J&j Design Plus Build | Joseph Aaron Haller | — | (951) 593 4759 | GC, remodel, ADU | Beaumont · Riverside County | — | — |
| J&j Landscape Concepts | J&j Landscape Concepts | — | (760) 625 4656 | Windows, patio, painters | Indio Hills · Riverside County | — | — |
| J&j Pro Tile INC | Jessica Ordaz | — | (951) 220 4448 | Other | Perris · Riverside County | — | — |
| J&j's General Construction Corp | Jose Irvin Abad | — | (951) 642 8621 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| J&m Air Conditioning And Heating | Michael Neal Goldsmith | — | (951) 654 3464 | HVAC | San Jacinto · Riverside County | — | — |
| J&m Synthetic Caulking And Waterproofing | Juan Gabriel Rodriguez-Gomez | — | (714) 276 5663 | Other | Riverside · Riverside County | — | — |