| Aaa Environmental | Aaa Environmental | — | (213) 748 4000 | GC, remodel, ADU | Huntington Beach · Orange County | — | — |
| Aaa Kitchen + Bath Remodeling & Eurocan Window Fashions | Gaurang Narendra Patel | — | (714) 243 8949 | GC, remodel, ADU | Fullerton · Orange County | — | — |
| Aaa Lowest Estimates And Qualities Construction | Tan Minh Pham | — | (714) 317 8904 | GC, remodel, ADU | Fountain Valley · Orange County | — | — |
| Aaa Plumbing | Jose Lorandy Arroyo | — | (714) 487 1897 | Other | Anaheim · Orange County | — | — |
| Aaa Pools & Water Management Co | Phyllis Anita Phelps | — | (949) 348 2202 | Pool | Mission Viejo · Orange County | — | — |
| Aaa Refinishing Enterprises INC | Scott Barry Davis | — | (818) 565 3500 | Other | Santa Ana · Orange County | — | — |
| Aaa Remodeling INC | Kevin Nikjou | — | (949) 278 7600 | GC, remodel, ADU | Mission Viejo · Orange County | — | — |
| Aaa Sun Builders | Casey Floyd Pilcher | — | (949) 929 0088 | Electricians | Irvine · Orange County | — | — |
| Aaa Suspended Ceilings INC | Mariel Cristina Meana | — | (714) 206 1082 | Other | Santa Ana · Orange County | — | — |
| Aaadvantage Construction Co | Steven Robert Nieri | — | (714) 719 3765 | GC, remodel, ADU | Huntington Beach · Orange County | — | — |
| Aabco Plumbing | Aabco Plumbing | — | (714) 307 9438 | Other | Anaheim · Orange County | — | — |
| Aac Hardwood Flooring | Aac Hardwood Flooring | — | (714) 425 0466 | Other | Tustin · Orange County | — | — |
| Aac Heating And Air INC | Angel Ismael Escobedo Guillen | — | (714) 878 9061 | HVAC | Garden Grove · Orange County | — | — |
| Aaf Painting INC | Martinez Fernando Rivera | — | (714) 718 6536 | Windows, patio, painters | Garden Grove · Orange County | — | — |
| Aaf Steel Structural | Luz Marina Agreda | — | (949) 279 1155 | Other | Mission Viejo · Orange County | — | — |
| Aafb Blasting | Mark Faucett | — | (805) 750 4080 | Other | San Clemente · Orange County | — | — |
| Aam&jianan LLC | Weian Luo | — | (323) 558 3885 | GC, remodel, ADU | Irvine · Orange County | — | — |
| Aancs LLC | Aaron Paul Barnhart | — | (415) 726 5450 | Electricians | Huntington Beach · Orange County | — | — |
| Aarav Construction | Sahil Paresh Desai | — | (949) 704 1555 | GC, remodel, ADU | San Clemente · Orange County | — | — |
| Aard Mechanical INC | Rosa Carina Hinojosa | — | (877) 227 3125 | HVAC | Brea · Orange County | — | — |
| Aaron Alt Construction INC | Aaron Joseph Alt | aaronaltconstruction@gmail.com | (714) 499 4922 | Electricians | Anaheim · Orange County | — | — |
| Aaron Caruso | Aaron Caruso | — | (949) 307 2815 | Electricians | Costa Mesa · Orange County | — | — |
| Aaron Electric | Anantkumar Ramdas Amin | — | (562) 923 3886 | Electricians | San Clemente · Orange County | — | — |
| Aaron Electric | Aaron Arthur Webb | — | (949) 355 9147 | Electricians | Costa Mesa · Orange County | — | — |
| Aaron J Mitchell INC | Aaron James Mitchell | — | (714) 425 1501 | GC, remodel, ADU | Anaheim · Orange County | — | — |
| Aaron M Burk | Aaron M Burk | — | (714) 402 8171 | Windows, patio, painters | Anaheim · Orange County | — | — |
| Aaron Painting | Aaron Painting | aaronpainting@sbcglobal.net | (714) 453 2827 | GC, remodel, ADU | Tustin · Orange County | — | — |
| Aaron Plumbing | Hun Choi | — | (323) 899 4519 | GC, remodel, ADU | Buena Park · Orange County | — | — |
| Aaron Pooya | Aaron Pooya | — | (949) 228 6393 | GC, remodel, ADU | Irvine · Orange County | — | — |
| Aarons's Natural Landscaping | Aarons's Natural Landscaping | — | (949) 283 3111 | Windows, patio, painters | Mission Viejo · Orange County | — | — |
| Aarow Drain & Plumbing | Henry Ransom Sebach | — | (714) 836 4861 | Other | Santa Ana · Orange County | — | — |
| Ab Customs Builds | Andrew Robert Bigalke | — | (949) 683 4442 | GC, remodel, ADU | Costa Mesa · Orange County | — | — |
| Ab Electrical Services | Andrei Cristian Barbulescu | — | (949) 418 2289 | Electricians | Laguna Hills · Orange County | — | — |
| Ab Remodeling INC | Aaron Joel Bonk | — | (714) 457 8623 | GC, remodel, ADU | Yorba Linda · Orange County | — | — |
| Abba Builder Co | Duy Ngoc Dinh | edward@abbabuilder.com | (714) 813 5409 | GC, remodel, ADU | Garden Grove · Orange County | — | — |
| Abc Heating And Air Conditioning | Abc Heating And Air Conditioning | — | (949) 756 0064 | HVAC | Costa Mesa · Orange County | — | — |
| Abc Home Construction | Molina Pedro Alamilla | — | (949) 566 7793 | GC, remodel, ADU | San Juan Capistrano · Orange County | — | — |
| Abc Installations Corp DBA Abc Kitchen Appliances | Joann Giang Le | — | (714) 369 5189 | Other | Westminster · Orange County | — | — |
| Abc Pressure Washing | Abc Pressure Washing | — | (714) 650 5328 | Other | Westminster · Orange County | — | — |
| Abc Realty | Abc Realty | — | (949) 856 2637 | GC, remodel, ADU | Newport Beach · Orange County | — | — |