| A M Masonry | A M Masonry | — | (714) 623 8340 | Other | Santa Ana · Orange County | — | — |
| A M O Construction | Timothy John Rietkerk | — | (310) 628 9198 | GC, remodel, ADU | San Clemente · Orange County | — | — |
| A M P Electrical | Andrew Maxwell Peters | — | (714) 403 5103 | Electricians | Huntington Beach · Orange County | — | — |
| A M P Heating And Air Conditioning | Alfred Mario Puccio | — | (714) 404 5420 | HVAC | Orange · Orange County | — | — |
| A M S Framing | A M S Framing | — | (949) 294 4723 | Other | Mission Viejo · Orange County | — | — |
| A Mechanical Heating & Air INC | Alejandro Garcia | — | (310) 968 1801 | HVAC | Buena Park · Orange County | — | — |
| A N S Heating And Air Conditioning | Aaron Nathan Shmuckler | — | (949) 290 8979 | HVAC | Costa Mesa · Orange County | — | — |
| A New Star Painting Co | Juan Jose Nieto | — | (714) 414 1091 | Windows, patio, painters | Yorba Linda · Orange County | — | — |
| A New View Windows & Doors INC | Cash Wrede Cockerill | — | (714) 953 7663 | GC, remodel, ADU | Anaheim · Orange County | — | — |
| A O C Marble & Granite INC | Mahdad Fard-Ghassemi | — | (714) 535 0800 | Other | Anaheim · Orange County | — | — |
| A O C Masonry | Albert Orlando Cubias | — | (714) 476 5133 | Other | Anaheim · Orange County | — | — |
| A Omega Termite & Construction Corp | Victor Manuel Jr Herrera | — | (949) 379 0469 | GC, remodel, ADU | Irvine · Orange County | — | — |
| A One Designs Co | Adam A Ghadiri | — | (949) 350 5556 | GC, remodel, ADU | Santa Ana · Orange County | — | — |
| A P Bathtub Painting | A P Bathtub Painting | — | (714) 805 4152 | Windows, patio, painters | Santa Ana · Orange County | — | — |
| A Plus Construction | Austin Israel Perez | — | (714) 757 1931 | GC, remodel, ADU | Placentia · Orange County | — | — |
| A Plus Construction | Jose Luis Jaimes | — | (949) 903 2847 | GC, remodel, ADU | La Habra · Orange County | — | — |
| A Plus Contracting INC | Ali Ebrahim Tabrizi | — | (949) 458 2108 | GC, remodel, ADU | Anaheim · Orange County | — | — |
| A Plus Electric | Luis Manuel Olmos | — | (949) 412 2684 | Electricians | San Clemente · Orange County | — | — |
| A Plus Heating & Air Conditioning Co | Kevin Van Tran | — | (714) 600 6999 | HVAC | Garden Grove · Orange County | — | — |
| A Plus Painting | A Plus Painting | — | (714) 270 7769 | Windows, patio, painters | Garden Grove · Orange County | — | — |
| A Plus Plumbing & Rooter INC | Jose Angel Lopez Ayala | — | (714) 317 6545 | Other | Garden Grove · Orange County | — | — |
| A Q A Construction INC | Antunes Alejandro Quintero | — | (949) 254 9031 | GC, remodel, ADU | Midway City · Orange County | — | — |
| A Quality Garage Door Company | Deric Scott Davidson | — | (714) 523 7900 | Other | Buena Park · Orange County | — | — |
| A R Bathroom And Floor Tile INC | Avalos Aaron Romero | — | (714) 661 4820 | Other | Santa Ana · Orange County | — | — |
| A R C Construction & Remodeling | Torres Segura Armando | — | (714) 222 1815 | GC, remodel, ADU | Anaheim · Orange County | — | — |
| A R C General Construction Corp | Alcala Aaron Umares | — | (714) 873 3591 | GC, remodel, ADU | La Habra · Orange County | — | — |
| A R E Property Development | Elijah Barkev Baghdikian | — | (714) 630 7100 | GC, remodel, ADU | Anaheim · Orange County | — | — |
| A R I Mechanical | A R I Mechanical | — | (949) 291 1939 | HVAC | San Clemente · Orange County | — | — |
| A R K Plumbing | A R K Plumbing | — | (949) 544 3343 | Other | Huntington Beach · Orange County | — | — |
| A R Pacific Construction | De Jesus Alejandro Rodriguez | — | (714) 478 5087 | GC, remodel, ADU | San Juan Capistrano · Orange County | — | — |
| A R Painting And Construction | Alejandro Miguel Rodriguez | — | (949) 279 8784 | GC, remodel, ADU | Laguna Woods · Orange County | — | — |
| A R Willis Construction INC | Anthony Robert Willis | info@willisconstruction.com | (562) 322 2744 | GC, remodel, ADU | Fullerton · Orange County | — | — |
| A Reliable Painter INC | Martinez Jenniffer | — | (714) 397 6171 | Windows, patio, painters | Garden Grove · Orange County | — | — |
| A Rivada General Construction | Arville De Guzman Rivada | — | (714) 397 7939 | GC, remodel, ADU | Orange · Orange County | — | — |
| A Rivas Plumbing INC | Adrian Alejandro Rivas | — | (949) 498 3727 | Other | San Clemente · Orange County | — | — |
| A Rynders Electric & Refrigeration | Andries John Rijnders | — | (714) 422 8144 | HVAC | Buena Park · Orange County | — | — |
| A S A P Construction | Cary David Snyder | — | (949) 510 0105 | GC, remodel, ADU | Dana Point · Orange County | — | — |
| A S A P Paving LLC | Sean Paul Bulmann | — | (714) 690 3780 | Other | Buena Park · Orange County | — | — |
| A S I Landscape Services INC | Israel Soriano | — | (714) 638 0696 | Windows, patio, painters | Garden Grove · Orange County | — | — |
| A S Wise INC | Sabga Anthony | — | (714) 891 1501 | Other | Huntington Beach · Orange County | — | — |