| J G Stouse Constructors INC | Jack Gregory Stouse | — | (951) 696 9354 | GC, remodel, ADU | Murrieta · Riverside County | — | — |
| J Ginger Masonry LP | Jonathan Alexander Ginger | — | (951) 688 5050 | Other | Riverside · Riverside County | — | — |
| J Glenna Construction INC | John Vincent Glenna | — | (951) 212 6730 | GC, remodel, ADU | Temecula · Riverside County | — | — |
| J H Construction | Jeffrey William Herndon | — | (951) 313 3395 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| J H Construction | Jason Martin Hall | — | (208) 317 5575 | GC, remodel, ADU | Lake Elsinore · Riverside County | — | — |
| J H Electric | Joseph Henry Linnastruth | — | (909) 438 8561 | Electricians | Jurupa Valley · Riverside County | — | — |
| J H Finishing | J H Finishing | — | (760) 600 0711 | GC, remodel, ADU | Desert Hot Springs · Riverside County | — | — |
| J H Remodeling | J H Remodeling | — | (714) 717 3511 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| J H Thompson & Sons INC | John Harrison Jr Thompson | — | (760) 345 6003 | Other | Bermuda Dunes · Riverside County | — | — |
| J Herbst Construction | Christopher Jayson Tull | — | (951) 226 6624 | GC, remodel, ADU | Menifee · Riverside County | — | — |
| J J & B Concrete | J J & B Concrete | — | (951) 490 7631 | Other | Perris · Riverside County | — | — |
| J J Building's Corporation | Janyra Rosario Salazar Alcaraz | — | (562) 241 6086 | GC, remodel, ADU | Hemet · Riverside County | — | — |
| J J Concrete | Jose Juan Hernandez Torres | — | (951) 570 9030 | Other | Banning · Riverside County | — | — |
| J J Concrete | J J Concrete | — | (951) 543 5128 | Other | Lake Elsinore · Riverside County | — | — |
| J J M Construction | James Joseph Iii Mc Grath | apinquiry@jjmconstruction.com | (909) 518 1804 | GC, remodel, ADU | Menifee · Riverside County | — | — |
| J J Plumbing | J J Plumbing | — | (951) 490 9525 | Other | Perris · Riverside County | — | — |
| J J Seamless Rain Gutters | J J Seamless Rain Gutters | — | (760) 535 0694 | Windows, patio, painters | Winchester · Riverside County | — | — |
| J J Tile And Marble | J J Tile And Marble | — | (760) 404 8877 | Other | Mecca · Riverside County | — | — |
| J J V C Construction Company | Juan Jose Castro | — | (909) 210 6257 | Electricians | Lake Elsinore · Riverside County | — | — |
| J Jesus Cerda Ramirez Iron Works | J Jesus Cerda Ramirez | — | (951) 515 2268 | Other | Corona · Riverside County | — | — |
| J Juarez Plumbing | Juan Carlos Juarez Lopez | — | (714) 727 9287 | Other | Corona · Riverside County | — | — |
| J K Construction | Jimmy Young Kang | — | (951) 719 9030 | Other | Menifee · Riverside County | — | — |
| J K L Construction | James Kenneth Lamb | john@jklconstruction.com | (602) 377-4986 | GC, remodel, ADU | Hemet · Riverside County | — | — |
| J Kerkuta Tile | J Kerkuta Tile | — | (702) 913 3852 | Other | La Quinta · Riverside County | — | — |
| J L A Flooring | J L A Flooring | — | (520) 405 5983 | Other | Sun City · Riverside County | — | — |
| J L Biber Construction | John Llewellyn Jr Biber | johnbiber@msn.com | (951) 707 7175 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| J L Blodgett Pool Construction | Jerry Lynn Jr Blodgett | — | (951) 377 7327 | Pool | Hemet · Riverside County | — | — |
| J L Builders | J L Builders | — | (951) 849 9700 | GC, remodel, ADU | Banning · Riverside County | — | — |
| J L Construction | Jeremy Thomas Lammers | — | (909) 800 5427 | GC, remodel, ADU | Calimesa · Riverside County | — | — |
| J L Fence.com | Jesse Manuel Luis | — | (951) 333 3017 | Other | Cabazon · Riverside County | — | — |
| J L Mendoza Company | Jose Luis Mendoza | — | (951) 532 2303 | GC, remodel, ADU | Perris · Riverside County | — | — |
| J L Mendoza Painting INC | Lorena Solorzano De Mendoza | — | (714) 493 4378 | Windows, patio, painters | Lake Elsinore · Riverside County | — | — |
| J L Painting & Construction | Lavan Joseph | — | (951) 259 1061 | GC, remodel, ADU | Canyon Lake · Riverside County | — | — |
| J L R Electric | Jerry Lee Ricker | — | (951) 675 0725 | Electricians | Bermuda Dunes · Riverside County | — | — |
| J Langley Construction | Jason Gordon Langley | jlangleyconstruction@msn.com | (951) 698 8615 | GC, remodel, ADU | Wildomar · Riverside County | — | — |
| J M A Plumbing | J M A Plumbing | — | (951) 729 9175 | Other | Riverside · Riverside County | — | — |
| J M Construction | Munguia Jesus | info@jmconstruction.com | (805) 472-2400 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| J M Construction | Joseph Daniel Mendez | info@jmconstruction.com | (805) 472-2400 | GC, remodel, ADU | Lake Elsinore · Riverside County | — | — |
| J M Construction | Javier Miranda Villa | info@jmconstruction.com | (805) 472-2400 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| J M Custom Tile And Stone | Jody Francis Madden | — | (714) 206 2592 | Other | Riverside · Riverside County | — | — |