| Alberto's Painting INC | Alberto Galindo Carballo | — | (714) 334 7198 | Windows, patio, painters | Orange · Orange County | — | — |
| Alberto's Services | Alberto Rios Vazquez | — | (714) 920 7433 | HVAC | Anaheim · Orange County | — | — |
| Albireo Energy | Isaac William Lieurance | — | (714) 692 9003 | Electricians | Anaheim · Orange County | — | — |
| Alcantara Builders INC | John Julian Alcantara | — | (562) 843 1701 | GC, remodel, ADU | La Habra · Orange County | — | — |
| Alcaraz Custom Concrete | Joseph Roman Alcaraz Quintana | — | (714) 353 7947 | Pool | Anaheim · Orange County | — | — |
| Alchemy Landscape Solutions | Alchemy Landscape Solutions | — | (714) 925 1767 | Windows, patio, painters | Anaheim · Orange County | — | — |
| Alchemy Sheet Metal INC | Brian Patrick Donlin | — | (949) 218 4880 | Other | San Clemente · Orange County | — | — |
| Alco Plumbing & Restoration | Alco Plumbing & Restoration | — | (949) 584 7731 | GC, remodel, ADU | Mission Viejo · Orange County | — | — |
| Alco Plumbing Heating & Air Conditioning INC | Alfonso Becerra | — | (949) 301 8246 | HVAC | Santa Ana · Orange County | — | — |
| Alcoa Electrical Contractor INC | Alan Scott Ohara | — | (714) 379 6880 | Electricians | Huntington Beach · Orange County | — | — |
| Alcoa Traffic Control INC | Alan Scott Ohara | info@alcoatrafficcontrol.com | (714) 379 6880 | Electricians | Huntington Beach · Orange County | — | — |
| Alcoa Traffic Services INC | Alan Scott Ohara | — | (714) 379 6880 | Electricians | Huntington Beach · Orange County | — | — |
| Alcor Best Deal Hardwood Floor & Moulding | Alan Lagera Cortez | — | (818) 642 0419 | Other | Orange · Orange County | — | — |
| Aldel Tile Stone Creation | Aldel Tile Stone Creation | — | (714) 493 6090 | GC, remodel, ADU | Fullerton · Orange County | — | — |
| Alderete Pools Inc. | Alderete Pools Inc. | — | (800) 492-7289 | Pool | San Clemente · Orange County | — | — |
| Aldia Landscape | Alesha Marie Deesing | — | (714) 351 8886 | Windows, patio, painters | Huntington Beach · Orange County | — | — |
| Ale INC | Walter Jay Aleshire | — | (626) 444 4561 | Other | Seal Beach · Orange County | — | — |
| Alectric Company | Alan Clark George | — | (949) 724 1608 | Electricians | Newport Beach · Orange County | — | — |
| Alegre Plumbing | Alegre Plumbing | — | (714) 441 0991 | Other | Fullerton · Orange County | — | — |
| Alegria Construction Consulting | Harold Michael Alegria | — | (213) 718 8262 | GC, remodel, ADU | Yorba Linda · Orange County | — | — |
| Alejandro G Santiago | Alejandro G Santiago | — | (714) 878 8739 | Electricians | Orange · Orange County | — | — |
| Aleman Construction | Juan Carlos Alejaldre Aleman | — | (714) 539 2334 | GC, remodel, ADU | Garden Grove · Orange County | — | — |
| Aleman's General Plumbing Services | Aleman-banderas Hilario | — | (714) 248 3693 | Other | Santa Ana · Orange County | — | — |
| Alex Albarran | Alex Albarran | — | (714) 454 9192 | Other | Orange · Orange County | — | — |
| Alex Construction & Handyman INC | Lopez Alex Chavez | — | (714) 472 0673 | GC, remodel, ADU | Cypress · Orange County | — | — |
| Alex Painting Solutions | Alex Painting Solutions | — | (949) 837 4456 | Windows, patio, painters | Laguna Niguel · Orange County | — | — |
| Alex Smith | Alex Smith | — | (949) 244 7854 | GC, remodel, ADU | Costa Mesa · Orange County | — | — |
| Alex Tapia | Alex Tapia | — | (714) 315 7153 | Other | Santa Ana · Orange County | — | — |
| Alex Woodard | Alex Woodard | — | (949) 228 2804 | Windows, patio, painters | Mission Viejo · Orange County | — | — |
| Alex's Flooring Company | Saul Alex Ruiz | — | (949) 861 1970 | Other | Anaheim · Orange County | — | — |
| Alex's Painting | Alex's Painting | — | (714) 884 7217 | Windows, patio, painters | Santa Ana · Orange County | — | — |
| Alex's Pool & Spa Service | Alexander Scott Calkins | — | (714) 227 5863 | Pool | Garden Grove · Orange County | — | — |
| Alexander Floors INC | Richard Lawrence Alexander | — | (562) 843 4445 | Other | Garden Grove · Orange County | — | — |
| Alexandr Gerasimov | Alexandr Gerasimov | — | (323) 379 6962 | GC, remodel, ADU | Costa Mesa · Orange County | — | — |
| Alexis Clean-up Services INC | Marco Arturo Garcia | — | (714) 473 1152 | Other | Santa Ana · Orange County | — | — |
| Alexstar2002electric INC | Iulian Luiz Neagu | — | (714) 728 7591 | Electricians | Stanton · Orange County | — | — |
| Alfa Builders INC | Rosalio Alonso | — | (562) 430 4450 | GC, remodel, ADU | Rossmoor · Orange County | — | — |
| Alfa Construction & Remodel | Mohammadali Kalantari | — | (949) 273 5546 | GC, remodel, ADU | Irvine · Orange County | — | — |
| Alfaro Electric | Jorge Adrian Alfaro Pedraza | — | (714) 987 0140 | Electricians | Anaheim · Orange County | — | — |
| Alfonso Gomez | Alfonso Gomez | — | (562) 477 9619 | Pool | Anaheim · Orange County | — | — |