| 2byforward INC | Julian Elmo David Seidenberg | — | (518) 821 4171 | Other | Sylmar · Los Angeles County | — | — |
| 2C General Engineering | Shannon Dean Criss | — | (530) 230 3861 | Tree | Roseville · Placer County | — | — |
| 2E Design & Development | 2E Design & Development | — | (949) 439 8260 | GC, remodel, ADU | Fountain Valley · Orange County | — | — |
| 2E Electric | Martinez Eleuterio | — | (949) 939 0387 | Electricians | Riverside · Riverside County | — | — |
| 2floor1 | Shifferman Erez | — | (818) 600 2009 | Other | Newhall · Los Angeles County | — | — |
| 2golden Construction | Ayar Negrete Ramon | — | (310) 430 3141 | GC, remodel, ADU | Compton · Los Angeles County | — | — |
| 2gun Roofing INC | Anthony Michael Tavera | — | (818) 245 2404 | Other roofers | Palmdale · Los Angeles County | — | — |
| 2H Construction INC | Sean Ralph Hitchcock | — | (562) 424 5567 | GC, remodel, ADU | Signal Hill · Los Angeles County | — | — |
| 2h2n Construction INC | Vahan Haroution Karakossian | — | (626) 354 3940 | GC, remodel, ADU | Pasadena · Los Angeles County | — | — |
| 2K Builders LLC | Thomas Wayne Jordan | — | (541) 731 3856 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| 2K Sheet Metal Company | Luis Carlos Jr Madero | — | (213) 507 6827 | Other | Los Angeles · Los Angeles County | — | — |
| 2l2a Painting | Ludwing Edgar Barrios | — | (909) 632 5680 | Windows, patio, painters | Lake Elsinore · Riverside County | — | — |
| 2M Drywall INC | Gomez Miguel Mendoza | — | (408) 836 6684 | Other | Santa Clara · Santa Clara County | — | — |
| 2M Electric INC | Menachem Mendel Wilhelm | menachem@2m-electric.com | (323) 364 2098 | Electricians | Los Angeles · Los Angeles County | — | — |
| 2M General Engineering INC | Matthew David Morrow | — | (916) 237 7445 | Other | West Sacramento · Yolo County | — | — |
| 2M Plumbing INC | Jaime Danilo Monterroso Mcclaughlin | — | (800) 815 4580 | Other | Van Nuys · Los Angeles County | — | — |
| 2nd Chance Backflow Solutions | 2nd Chance Backflow Solutions | — | (909) 477 0018 | Other | Jurupa Valley · Riverside County | — | — |
| 2nd Gen Glass LLC | Arthur Blake Gonzalez | — | (909) 372 2108 | Windows, patio, painters | Yucaipa · San Bernardino County | — | — |
| 2nd Gen Plumbing INC | Lopez Ivan Fernandez | — | (619) 607 8855 | Other | San Diego · San Diego County | — | — |
| 2nd Generation Builders INC | Rubi Alejandra Chavez | — | (661) 596 0965 | GC, remodel, ADU | Bakersfield · Kern County | — | — |
| 2nd Generation Development INC DBA Bay Area Pervious Concrete | Liguori David | — | (650) 596 0683 | GC, remodel, ADU | San Carlos · San Mateo County | — | — |
| 2nd Generation Fencing | 2nd Generation Fencing | — | (209) 923 3080 | Other | Valley Springs · Calaveras County | — | — |
| 2ne1 Roofing | Jeong Kang | — | (213) 925 6677 | Other roofers | Los Angeles · Los Angeles County | — | — |
| 2R Plumbing INC | Jose Antonio Ore | — | (323) 629 5341 | Other | Los Angeles · Los Angeles County | — | — |
| 2R Remodel | 2R Remodel | — | (818) 968 8860 | GC, remodel, ADU | West Hills · Los Angeles County | — | — |
| 2revamp Onsite INC | Jed Daniel Shreve | — | (925) 586 5229 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| 2s2g Contracting INC | Michael Anthony Harrod | — | (714) 602 7855 | Other | Corona · Riverside County | — | — |
| 2T Builders | Daniel Christopher Pruitt | — | (530) 651 3085 | GC, remodel, ADU | Georgetown · El Dorado County | — | — |
| 2vm Socal Construction | Victor Manuel Martinez | 2vmhome@2vmsocalconstruction.com | (562) 355 0602 | GC, remodel, ADU | Los Alamitos · Orange County | — | — |
| 2wg Construction INC | Kevin Sangsoo Byun | — | (213) 388 6884 | GC, remodel, ADU | La Crescenta · Los Angeles County | — | — |
| 2X Communications INC | Kala Martin Mullaney | info@2xcommunications.com | (559) 905 9800 | Other | Fresno · Fresno County | — | — |
| 2x4 Renovation & Remodel | Garcia Fernando Diaz | — | (714) 955 3587 | GC, remodel, ADU | Huntington Beach · Orange County | — | — |
| 2xm Hardwood Floors | Melvin Estuardo Herrera Y Herrera | — | (310) 237 5848 | Other | Lawndale · Los Angeles County | — | — |
| 2Y Construction INC | Huh Youl | — | (510) 760 3023 | GC, remodel, ADU | Castro Valley · Alameda County | — | — |
| 3 | Farid Andres Ayoubzadeh-Reyes | — | (619) 879 4105 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| 3 & 1 Plumbing INC | Sanchez Octavio Elias | — | (818) 605 8601 | Other | Winnetka · Los Angeles County | — | — |
| 3 - B'z Painting Co | Kohavi Anita | — | (818) 752 7613 | GC, remodel, ADU | Van Nuys · Los Angeles County | — | — |
| 3 - Bar Corporation | Christopher Todd Wray | — | (805) 390 9505 | Other | Camarillo · Ventura County | — | — |
| 3 - D Construction | Kent Allen Douglas | — | (650) 464 7961 | GC, remodel, ADU | Lake Almanor · Lassen County | — | — |
| 3 - D Enterprises Incorporated | Elihu Shahrokh | office@3d-nt.com | (858) 530 2202 | HVAC | San Diego · San Diego County | — | — |