| 'go' Electric | Enrique Jesus Ortiz | — | (323) 222 2370 | Electricians | Los Angeles · Los Angeles County | — | — |
| +nvioronics INC DBA W B Schulte Construction | Christopher Solon Garrett | — | (818) 266 8440 | GC, remodel, ADU | Los Angeles · Los Angeles County | — | — |
| 04pan Nogada | 04pan Nogada | — | (310) 494 1636 | GC, remodel, ADU | Pasadena · Los Angeles County | — | — |
| 1 - 2 - 3 Plumbing & Rooter | Eduardo Ramirez Alvarado | — | (818) 335 4935 | Other | Sherman Oaks · Los Angeles County | — | — |
| 1 800 Pro-fence | 1 800 Pro-fence | — | (626) 221 9245 | Other | Monrovia · Los Angeles County | — | — |
| 1 Above Technology LLC | Yehuda Eliezer Netkin | — | (323) 325 6373 | Other | Los Angeles · Los Angeles County | — | — |
| 1 AC Guys | Sahak Danielyan | — | (213) 444 4223 | HVAC | Panorama City · Los Angeles County | — | — |
| 1 And 1 Electric INC | Khosravi Sami | — | (818) 401 3734 | Electricians | Canoga Park · Los Angeles County | — | — |
| 1 Day Kitchen Bath & Tile Construction Corporation | Pejman Tanaeim | — | (310) 370 0282 | GC, remodel, ADU | Lawndale · Los Angeles County | — | — |
| 1 Day Rooter & Plumbing INC | Varuzhan Josh Balyan | — | (626) 696 9757 | Other | Hacienda Heights · Los Angeles County | — | — |
| 1 Design Construction Corp | Min Kyung Ho | — | (213) 384 0011 | GC, remodel, ADU | Los Angeles · Los Angeles County | — | — |
| 1 Master's Shop Construction INC | Aguayo Mario Escobedo | — | (818) 523 3884 | GC, remodel, ADU | Agoura Hills · Los Angeles County | — | — |
| 1 Oak Remodeling | Joshua Navid Keshmir | — | (877) 448 1625 | GC, remodel, ADU | Encino · Los Angeles County | — | — |
| 1 Smart Build INC | Isaac Sade | — | (866) 419 8840 | GC, remodel, ADU | Woodland Hills · Los Angeles County | — | — |
| 1 Source Material Handling INC | John M Howard | — | (818) 838 1688 | Other | Glendale · Los Angeles County | — | — |
| 1 St California Construction INC | Zamani Alireza | — | (626) 533 5673 | GC, remodel, ADU | Pasadena · Los Angeles County | — | — |
| 1 St Choice Energy Builders INC | Maor Tziun Knafo | — | (818) 277 0514 | GC, remodel, ADU | Tarzana · Los Angeles County | — | — |
| 1 St Choice Restoration LLC | Allen Danilof | — | (818) 912 3232 | GC, remodel, ADU | Porter Ranch · Los Angeles County | — | — |
| 1 Stop Builders | Rahlin Yaaqov | — | (877) 220 5575 | GC, remodel, ADU | Mission Hills · Los Angeles County | — | — |
| 1 Stop Building Construction | Angel Villegas Gonzalez | — | (562) 318 7515 | GC, remodel, ADU | Long Beach · Los Angeles County | — | — |
| 1 Stop Kitchen & Bath LLC | Mike Amin Arid | — | (818) 708 7777 | GC, remodel, ADU | Reseda · Los Angeles County | — | — |
| 1+ | Kenneth William Akiyoshi | — | (323) 316 4812 | GC, remodel, ADU | Monterey Park · Los Angeles County | — | — |
| 1-way Landscape INC | Gutierrez Hugo | — | (562) 522 5294 | Windows, patio, painters | Long Beach · Los Angeles County | — | — |
| 10 Points Construction INC | Oscar Isaias Panameno | — | (310) 261 0063 | GC, remodel, ADU | Bellflower · Los Angeles County | — | — |
| 101 Group Remodeling | Andrei Koshtur | — | (347) 410 2830 | GC, remodel, ADU | Encino · Los Angeles County | — | — |
| 101 Home Builders INC | James David Sansom | — | (818) 266 4211 | GC, remodel, ADU | Van Nuys · Los Angeles County | — | — |
| 101 Paving Company | Francisco Xaiver Pelayo | — | (818) 370 4281 | Other | Littlerock · Los Angeles County | — | — |
| 101 Plumbing & Rooter | Marco Antonio Chavolla | — | (213) 393 8908 | Other | Los Angeles · Los Angeles County | — | — |
| 101 West Coast INC | Glenn Howard Stern | — | (818) 613 8567 | GC, remodel, ADU | Encino · Los Angeles County | — | — |
| 101 West Painting | 101 West Painting | — | (818) 579 3853 | Windows, patio, painters | Santa Clarita · Los Angeles County | — | — |
| 11 Electric LLC | Wes Bruce Farnsworth | — | (310) 948 8701 | Electricians | Marina Del Rey · Los Angeles County | — | — |
| 110 Lavant INC | Janelle Alize Ramos | — | (310) 880 5657 | GC, remodel, ADU | Torrance · Los Angeles County | — | — |
| 110 Pro HVAC INC | Messbah Dast Gheib | — | (818) 590 6886 | HVAC | Encino · Los Angeles County | — | — |
| 111 Construction INC | Keyork Ohannes Ayarian | — | (818) 535 3111 | GC, remodel, ADU | Northridge · Los Angeles County | — | — |
| 11B INC DBA Yourdeckbuilder.com | Matthew William Thompson | — | (323) 963 3257 | GC, remodel, ADU | Burbank · Los Angeles County | — | — |
| 12 Bravo Development INC | Woo Sangin | — | (626) 423 2732 | GC, remodel, ADU | Santa Fe Springs · Los Angeles County | — | — |
| 12 One 12 Renovations | 12 One 12 Renovations | — | (562) 313 9990 | GC, remodel, ADU | San Pedro · Los Angeles County | — | — |
| 126 Builders INC | Ricardo Antonio Lizarraga | — | (951) 232 0361 | GC, remodel, ADU | Walnut · Los Angeles County | — | — |
| 126 New Construction INC | Behroz Sarange | — | (818) 516 3843 | GC, remodel, ADU | Calabasas · Los Angeles County | — | — |
| 1320 Construction INC | Matthew Blake Tarry | — | (805) 416 4116 | GC, remodel, ADU | Chatsworth · Los Angeles County | — | — |