| Alpha & Omega Custom Painting | Jose Roberto Torres Chavez | — | (714) 390 9150 | Windows, patio, painters | Orange · Orange County | — | — |
| Alpha & Omega Pro Painting | Quintero Emmanuel Hernandez | — | (714) 856 7635 | Windows, patio, painters | La Habra · Orange County | — | — |
| Alpha - Regional INC | Lawrence Hull Jr Platt | info@alpharegional.com | (714) 734 3394 | GC, remodel, ADU | Tustin · Orange County | — | — |
| Alpha Building Structures | Adam Thinh Chung | — | (909) 643 7617 | GC, remodel, ADU | Westminster · Orange County | — | — |
| Alpha Construction Services | Adel Elias Shamoo | interested@domainmarket.com | (818) 554 2443 | Electricians | Costa Mesa · Orange County | — | — |
| Alpha Don Construction INC | Richter Earnest Tibbe | — | (562) 743 1170 | GC, remodel, ADU | Garden Grove · Orange County | — | — |
| Alpha Electric INC | Alexis Saucedo | — | (562) 794 7376 | Electricians | Anaheim · Orange County | — | — |
| Alpha Electrical Co | Forootan Mohammad | — | (949) 370 7589 | Electricians | Laguna Niguel · Orange County | — | — |
| Alpha Energy Electric | Uriel Isai Garcia | — | (714) 640 9076 | Electricians | Tustin · Orange County | — | — |
| Alpha Energy Group INC | Hyung Keun Cho | — | (657) 214 2006 | HVAC | Anaheim · Orange County | — | — |
| Alpha Enviro Tech INC | John Charles Fitzmaurice | info@alphaenvirotech.com | (800) 632 9339 | Other roofers | Anaheim · Orange County | — | — |
| Alpha Hardwood Floor Services | Quy Van Nguyen | — | (714) 588 0740 | Other | Westminster · Orange County | — | — |
| Alpha Home Remodeling INC | Jose Augusto Herrera Alfaro | — | (714) 583 1482 | GC, remodel, ADU | Fullerton · Orange County | — | — |
| Alpha King Landscaping And Design | Alpha King Landscaping And Design | — | (714) 235 7122 | Windows, patio, painters | Santa Ana · Orange County | — | — |
| Alpha Natures Landscaping | Maya Adolfo Esquivel | — | (714) 588 7436 | Windows, patio, painters | Fullerton · Orange County | — | — |
| Alpha Omega Construction Services | Robert Jr Banuelos | — | (714) 501 9976 | GC, remodel, ADU | Santa Ana · Orange County | — | — |
| Alpha Omega Contractors INC | David Charles Jalaty | — | (949) 606 2146 | GC, remodel, ADU | Irvine · Orange County | — | — |
| Alpha Omega Home Builders | Joshua Aaron Kreutzen | — | (714) 616 0417 | GC, remodel, ADU | Irvine · Orange County | — | — |
| Alpha One Demolition & Hauling | Hamza Diab | — | (949) 394 2575 | Other | Irvine · Orange County | — | — |
| Alpha Painting Inc. | Michael Byung Kim | — | (714) 200 7777 | GC, remodel, ADU | Huntington Beach · Orange County | — | — |
| Alpha Pool & Spa Services | Armin Karl Lotz | — | (714) 366 5625 | Pool | Garden Grove · Orange County | — | — |
| Alpha Refrigeration & A/c Co | Un Koo Lee | — | (714) 273 0909 | HVAC | Cypress · Orange County | — | — |
| Alpha Repair INC DBA Alpha HVAC Repair And Installation | Dzhabrail Shamilov | — | (714) 234 3639 | HVAC | Mission Viejo · Orange County | — | — |
| Alphatech Systems LLC | Dustin A Klett | — | (714) 926 7074 | Electricians | Yorba Linda · Orange County | — | — |
| Alpine Heating & Air Conditioning | Alpine Heating & Air Conditioning | — | (714) 901 0552 | HVAC | Seal Beach · Orange County | — | — |
| Alpine Heating And Cooling INC | Nikolai Dovgulich | — | (949) 567 8989 | HVAC | Irvine · Orange County | — | — |
| Alpine Marble Restoration INC | Gary Walter Milewski | — | (800) 477 6547 | Restoration | Orange · Orange County | — | — |
| Alpine Ref INC | Muing Chul Kim | — | (714) 822 7774 | HVAC | Cypress · Orange County | — | — |
| Alpine Reinforcing LLC | Travis Jacob Herwehe | — | (949) 683 6209 | Other | Mission Viejo · Orange County | — | — |
| Alps Air Conditioning & Heating INC | Alfonso Jaime Puig | — | (714) 633 8904 | HVAC | Anaheim · Orange County | — | — |
| Alro Construction INC | Cesar Rodolfo Rodriguez | — | (949) 750 9055 | GC, remodel, ADU | Santa Ana · Orange County | — | — |
| Alta California Tile Concept | Hernandez Raul Aguilar | — | (714) 470 6037 | Other | Fullerton · Orange County | — | — |
| Alta Vista Landscape INC | Calderon Rafael Arredondo | — | (657) 201 6904 | Windows, patio, painters | Placentia · Orange County | — | — |
| Altair Construction And Home Solutions | Zhang Yanpeng | — | (949) 543 6131 | GC, remodel, ADU | Laguna Hills · Orange County | — | — |
| Altair Design Group DBA Altair Design And Build | Ramin Hassankhani Seysan | — | (858) 837 1315 | GC, remodel, ADU | Aliso Viejo · Orange County | — | — |
| Alter Built | Alter Built | — | (949) 683 5386 | GC, remodel, ADU | Laguna Beach · Orange County | — | — |
| Altera Landscape | Ryan Samuel Suarez | — | (949) 575 2685 | Windows, patio, painters | Dana Point · Orange County | — | — |
| Altergott Construction INC | Gary Martin Altergott | — | (949) 295 4782 | GC, remodel, ADU | Laguna Niguel · Orange County | — | — |
| Alternative Concrete Toppings | Alternative Concrete Toppings | — | (714) 323 2591 | Other | Orange · Orange County | — | — |
| Alternative Landscapes INC | Hugo Trinidad Chavez Ruiz | — | (714) 926 1236 | Windows, patio, painters | Placentia · Orange County | — | — |