| 301 Projects INC | Young Chul Kim | — | (213) 278 2899 | GC, remodel, ADU | Los Angeles · Los Angeles County | — | — |
| 310 Construction INC | Daniel Jose Torres | — | (844) 310 9050 | GC, remodel, ADU | Torrance · Los Angeles County | — | — |
| 310 Electric INC | Victor Alvarez | — | (310) 345 5612 | Electricians | Compton · Los Angeles County | — | — |
| 310 General Electrical | Cardenas Gabriel | — | (310) 254 5832 | Electricians | Los Angeles · Los Angeles County | — | — |
| 310 HVAC LLC | John Angel Castillo | — | (310) 902 0393 | HVAC | Mar Vista · Los Angeles County | — | — |
| 310 Plumbing INC | Ramirez Sergio | — | (310) 310 0113 | Other | Santa Monica · Los Angeles County | — | — |
| 316 Engineering And Construction Co INC | John William Massie | — | (818) 395 7989 | GC, remodel, ADU | Rosemead · Los Angeles County | — | — |
| 316 Windows & Door Installers | 316 Windows & Door Installers | — | (661) 526 9786 | Windows, patio, painters | Lancaster · Los Angeles County | — | — |
| 31O Development INC | Santosuosso John | — | (310) 869 4745 | GC, remodel, ADU | Los Angeles · Los Angeles County | — | — |
| 33rd INC | Marcos Anthony Rivas | — | (818) 805 3479 | GC, remodel, ADU | Chatsworth · Los Angeles County | — | — |
| 360 Air Conditioning | 360 Air Conditioning | — | (213) 820 2714 | HVAC | Los Angeles · Los Angeles County | — | — |
| 360 Contractors Group INC | Marco Antonio Olaya | — | (818) 599 3166 | GC, remodel, ADU | Burbank · Los Angeles County | — | — |
| 360 Design & Build Co | Jason Le | — | (626) 898 2323 | GC, remodel, ADU | Covina · Los Angeles County | — | — |
| 360 Electric INC | Jeffrey George Guldalian | — | (818) 296 5120 | Electricians | Chatsworth · Los Angeles County | — | — |
| 360 Electrician | Mike Eymany | — | (818) 633 1845 | Electricians | West Hills · Los Angeles County | — | — |
| 360 Fire Alarm Solution INC | Richard Joseph Gatewood | — | (818) 744 4803 | Electricians | Granada Hills · Los Angeles County | — | — |
| 360 Heating & Air | 360 Heating & Air | — | (323) 636 1701 | HVAC | Los Angeles · Los Angeles County | — | — |
| 360 Industrial Service Group LLC | Sonia Margarita Misoreli | — | (562) 455 3363 | Other | Lakewood · Los Angeles County | — | — |
| 360 Painting | Jorge Alberto Pasten | — | (562) 987 4559 | GC, remodel, ADU | Carson · Los Angeles County | — | — |
| 360 Plumbing & Rooter INC | Raul Ivar Reyes | — | (310) 261 3729 | Other | Los Angeles · Los Angeles County | — | — |
| 360 Plumbing INC | Miguel Angel Rivera | — | (818) 970 6406 | Other | Tarzana · Los Angeles County | — | — |
| 360 Property Maintenance INC | Aguirre Jose Ramos | — | (818) 984 8893 | Other | Santa Clarita · Los Angeles County | — | — |
| 360 Remodeling & Building INC | Torgeman Asaf | — | (818) 469 2646 | GC, remodel, ADU | Tarzana · Los Angeles County | — | — |
| 360 Surveillance | 360 Surveillance | — | (909) 524 8210 | Other | Claremont · Los Angeles County | — | — |
| 360 Unlimited Construction INC | Manuel Alexander Rodriguez Flores | — | (323) 830 7071 | GC, remodel, ADU | Los Angeles · Los Angeles County | — | — |
| 365 Construction INC | Mickey Carl Bearden | — | (626) 599 2002 | GC, remodel, ADU | Irwindale · Los Angeles County | — | — |
| 365 Demolition INC | Ohad Maloul | — | (818) 356 1731 | GC, remodel, ADU | Woodland Hills · Los Angeles County | — | — |
| 365 Electric INC | Jose Martin Huerta | — | (424) 420 3277 | Electricians | Carson · Los Angeles County | — | — |
| 365 Pros Pools INC | Fernando Ramirez | — | (661) 313 0870 | Pool | Paramount · Los Angeles County | — | — |
| 365 Restoration Services INC | Samantha Meltz | — | (661) 287 9717 | GC, remodel, ADU | Santa Clarita · Los Angeles County | — | — |
| 38th Parallel LLC | Hojin Lim | — | (213) 601 3486 | Windows, patio, painters | Los Angeles · Los Angeles County | — | — |
| 396 Roofing | Francisco Javier Diaz Acosta | — | (818) 913 1248 | Other roofers | Arleta · Los Angeles County | — | — |
| 3A Genius Remodeling Corp | Eli Shalom Itshak | — | (818) 267 7607 | GC, remodel, ADU | West Hills · Los Angeles County | — | — |
| 3B Group LLC | Celso Barcena | — | (323) 397 1776 | Electricians | Los Angeles · Los Angeles County | — | — |
| 3cab Electric INC | Juan Miguel Cerna Aguilar | — | (323) 901 5243 | Electricians | Los Angeles · Los Angeles County | — | — |
| 3D Concrete | 3D Concrete | — | (562) 244 3923 | Other | Bellflower · Los Angeles County | — | — |
| 3D Construction | Keshishian Ara | — | (661) 203 2308 | GC, remodel, ADU | Glendale · Los Angeles County | — | — |
| 3D Contractors INC | Daniel Virgen-Vazquez | — | (323) 714 5886 | GC, remodel, ADU | Commerce · Los Angeles County | — | — |
| 3daysgc LLC | Angel Francisco Salcido Reyna | — | (909) 732 6281 | GC, remodel, ADU | Claremont · Los Angeles County | — | — |
| 3E Painting And Custom Refinishing INC | Rosa Alva Bernardi | — | (714) 343 4011 | Windows, patio, painters | Long Beach · Los Angeles County | — | — |