| Jaren Durham Electric | Jaren Joseph Durham | — | (951) 285 6664 | Electricians | Wildomar · Riverside County | — | — |
| Jarrod N Ferritor | Jarrod N Ferritor | — | (909) 947 9364 | Other | Eastvale · Riverside County | — | — |
| Jars General Engineering | Jars General Engineering | — | (951) 599 3110 | Electricians | Riverside · Riverside County | — | — |
| Jasebro Engineering | Jasebro Engineering | — | (714) 390 4778 | Other | Norco · Riverside County | — | — |
| Jason Anthony Mucha | Jason Anthony Mucha | — | (714) 457 9962 | GC, remodel, ADU | Eastvale · Riverside County | — | — |
| Jason Belknap | Jason Belknap | — | (909) 645 4597 | GC, remodel, ADU | Beaumont · Riverside County | — | — |
| Jason Campbell Construction | Jason Paul Campbell | — | (760) 275 5679 | GC, remodel, ADU | Desert Hot Springs · Riverside County | — | — |
| Jason Doan | Jason Doan | — | (909) 618 7477 | Other | Riverside · Riverside County | — | — |
| Jason Harrison | Jason Harrison | — | (951) 703 9238 | Electricians | Mira Loma · Riverside County | — | — |
| Jason Lee | Jason Lee | — | (714) 673 1993 | Electricians | Murrieta · Riverside County | — | — |
| Jason Peterson | Jason Peterson | — | (951) 288 3222 | Other | Perris · Riverside County | — | — |
| Jason Rivera | Jason Rivera | — | (760) 391 2850 | HVAC | Thermal · Riverside County | — | — |
| Jason Row Drywall | Jason Row Drywall | — | (714) 244 6079 | Other | Beaumont · Riverside County | — | — |
| Jason Valdovinos | Jason Valdovinos | — | (909) 206 8135 | Electricians | Calimesa · Riverside County | — | — |
| Jason Webster Construction | Jason Edward Webster | — | (909) 263 7530 | GC, remodel, ADU | Beaumont · Riverside County | — | — |
| Jason Yergenson | Jason Yergenson | — | (760) 567 2455 | GC, remodel, ADU | Desert Hot Springs · Riverside County | — | — |
| Jason's Plumbing INC | Jason Shane Woodward | — | (760) 449 6906 | Other | La Quinta · Riverside County | — | — |
| Jav Electric | Joseph Anthony Vaccarino | javelectric@verizon.net | (951) 623 7240 | Electricians | Winchester · Riverside County | — | — |
| Javachi Homes | Javachi Homes | — | (951) 973 9028 | GC, remodel, ADU | Murrieta · Riverside County | — | — |
| Javier Arturo Perez Raygada | Javier Arturo Perez Raygada | — | (760) 200 7066 | Pool | Palm Desert · Riverside County | — | — |
| Javier Gaucin Santillan | Javier Gaucin Santillan | — | (760) 475 3338 | Other | Coachella · Riverside County | — | — |
| Javier Leyva | Javier Leyva | — | (951) 796 4804 | Other | Riverside · Riverside County | — | — |
| Javier Orozco Mendoza | Javier Orozco Mendoza | — | (760) 984 4761 | Other | Indio · Riverside County | — | — |
| Javier's Flooring INC | Francisco Javier Arciniega | — | (951) 830 4303 | Other | Riverside · Riverside County | — | — |
| Jawco Certified Welding INC | Andreas Joseph Moulis | — | (951) 704 5312 | Other | Wildomar · Riverside County | — | — |
| Jaws Construction | Kyle Paige Gibbs Huddy | — | (760) 841 5297 | GC, remodel, ADU | Bermuda Dunes · Riverside County | — | — |
| Jay Franklin Mc Phail | Jay Franklin Mc Phail | — | (951) 316 1497 | Electricians | Riverside · Riverside County | — | — |
| Jay Renovation | Jay Renovation | — | (909) 658 5252 | GC, remodel, ADU | Jurupa Valley · Riverside County | — | — |
| Jay's Construction Service | Javier Ortiz Rodriguez | — | (562) 225 7500 | Electricians | Corona · Riverside County | — | — |
| Jay's Development Contractor's | Jay's Development Contractor's | — | (951) 906 8597 | GC, remodel, ADU | Perris · Riverside County | — | — |
| Jay's Electric Company INC | Jerardo Jaimes | brandon@jayselectric.com | (760) 905 1118 | Electricians | Cathedral City · Riverside County | — | — |
| Jay's Heating And Cooling | Jay's Heating And Cooling | — | (626) 322 4051 | HVAC | Moreno Valley · Riverside County | — | — |
| Jay's Pool & Spa INC | Doris Patricia Garnett | — | (951) 302 6300 | Pool | Temecula · Riverside County | — | — |
| Jay's Roofing | Jay Roland Moreau | — | (714) 423 2120 | Other roofers | Corona · Riverside County | — | — |
| Jaz Landscaping INC | Joaquin Alvarado-Zendejas | — | (760) 218 1142 | Windows, patio, painters | Coachella · Riverside County | — | — |
| Jaz Plumbing INC | Juan Andres Jr Zamora | — | (951) 963 4453 | Other | Corona · Riverside County | — | — |
| Jb Air LLC | Jonathan Jesus Sanchez Barba | — | (951) 837 8557 | HVAC | Wildomar · Riverside County | — | — |
| Jb Construction | Garcia Juan | — | (951) 956 3853 | GC, remodel, ADU | Perris · Riverside County | — | — |
| Jb Flooring | Jb Flooring | — | (951) 258 5817 | Other | Riverside · Riverside County | — | — |
| Jb Floors | Jb Floors | — | (951) 622 1507 | Other | Riverside · Riverside County | — | — |