| Ace Construction | Charles Robert Budds | — | (714) 921 1292 | GC, remodel, ADU | Anaheim Hills · Orange County | — | — |
| Ace Construction & Coating INC | Shuh-Shin Bobby Chiang | — | (714) 526 4143 | GC, remodel, ADU | Fullerton · Orange County | — | — |
| Ace Construction And Plumbing | Michael Angel Aceves | — | (714) 335 7596 | GC, remodel, ADU | Orange · Orange County | — | — |
| Ace Crown Painting INC | Tae Chang Ha | — | (949) 933 8080 | Windows, patio, painters | Irvine · Orange County | — | — |
| Ace Electric | Rozsa Victor | — | (949) 551 6749 | Electricians | Irvine · Orange County | — | — |
| Ace Equipment INC | Rich Steven Hayes | — | (714) 914 3367 | Other | Santa Ana · Orange County | — | — |
| Ace General Contractor | Ace General Contractor | — | (714) 235 8486 | GC, remodel, ADU | Orange · Orange County | — | — |
| Ace Installation LLC | Quang Hoang Duc Tran | ace@aceinstallation.com | (714) 426 9390 | GC, remodel, ADU | Garden Grove · Orange County | — | — |
| Ace Low Voltage | Rafael Rodriguez | — | (714) 369 5411 | Other | Anaheim · Orange County | — | — |
| Ace Management Company | Abraham Carleton Elliott | ace@ace-management.com | (949) 350 7772 | Electricians | Costa Mesa · Orange County | — | — |
| Ace Mirror And Glass | Zoeb Noordin | — | (949) 588 1187 | Windows, patio, painters | Laguna Hills · Orange County | — | — |
| Ace Painting | Justin Hs Kim | john@ace-painting.com | (714) 447 9900 | GC, remodel, ADU | Fullerton · Orange County | — | — |
| Ace Painting | Ace Painting | — | (714) 222 0338 | Windows, patio, painters | Stanton · Orange County | — | — |
| Ace Painting Contractor | Ace Painting Contractor | — | (949) 357 9257 | Windows, patio, painters | Mission Viejo · Orange County | — | — |
| Ace Pool Repair & Replaster | Alec Cameron Davis | — | (909) 577 5274 | Pool | Brea · Orange County | — | — |
| Ace Pro Builders LLC | Nathan Duy Loc Nguyen | — | (714) 369 0298 | GC, remodel, ADU | Fountain Valley · Orange County | — | — |
| Ace Swimming Pool Maintenance | Sung Baek Kim | — | (714) 345 5516 | Pool | Garden Grove · Orange County | — | — |
| Acer Mechanical INC | Robert Edward Hidalgo | — | (714) 624 6753 | HVAC | Yorba Linda · Orange County | — | — |
| Acero INC | Carlos Ricardo Acer Pacheco | — | (714) 526 8327 | Windows, patio, painters | Orange · Orange County | — | — |
| Aces Signs | Tinajero Sergio Aceves | — | (714) 335 5348 | Other | Santa Ana · Orange County | — | — |
| Acetec Security Systems | Acetec Security Systems | — | (949) 451 1555 | Electricians | Lake Forest · Orange County | — | — |
| Acetech Mechanical | Acetech Mechanical | — | (562) 760 6211 | HVAC | Huntington Beach · Orange County | — | — |
| Acex Construction INC | Charlie Chavez Mordoki | — | (714) 650 4122 | GC, remodel, ADU | La Habra · Orange County | — | — |
| Acho Painting INC | Yong Ha Kim | — | (714) 345 7898 | Windows, patio, painters | Fullerton · Orange County | — | — |
| Aci Flooring INC | Andrew John Wynder | — | (714) 558 0446 | Other | Santa Ana · Orange County | — | — |
| Acjc Air Conditioning | Julio Cesar De La Rosa Cervantes | info@acjcairconditioning.com | (714) 583 1741 | HVAC | Anaheim · Orange County | — | — |
| Ackerlind Pacific | Ackerlind Pacific | — | (949) 395 5390 | GC, remodel, ADU | Laguna Niguel · Orange County | — | — |
| Acme Drywall Services | John Christopher Duff | — | (562) 986 0556 | GC, remodel, ADU | Los Alamitos · Orange County | — | — |
| Acme Home INC | David Carl Feldman | — | (714) 988 5878 | GC, remodel, ADU | Fullerton · Orange County | — | — |
| Acons Group | Alireza Abedi | — | (949) 378 8144 | GC, remodel, ADU | Newport Beach · Orange County | — | — |
| Acorn Landscape | Acorn Landscape | — | (949) 661 6448 | Windows, patio, painters | San Juan Capistrano · Orange County | — | — |
| Acosta Tile | Acosta Tile | — | (714) 851 5658 | Other | Anaheim · Orange County | — | — |
| Acosta Tile | Kimmara Lavon Acosta | — | (714) 348 4441 | Other | Fullerton · Orange County | — | — |
| Acp Services | Daniel Aaron Garza | — | (714) 466 0652 | Other | Cypress · Orange County | — | — |
| Acr Design & Build | Gigi Georgette Guichard | — | (714) 377 9569 | GC, remodel, ADU | Sunset Beach · Orange County | — | — |
| Acres Technologies | Acres Technologies | — | (714) 232 6881 | HVAC | Buena Park · Orange County | — | — |
| Acs Construction INC | Oracio Perez-Olivares | — | (951) 538 0679 | GC, remodel, ADU | Villa Park · Orange County | — | — |
| Act Distribution INC | Kenneth Mason Johnson | — | (714) 668 1200 | GC, remodel, ADU | Costa Mesa · Orange County | — | — |
| Act First Fire Protection INC | Anton William Schroeder | — | (714) 630 3916 | Other | Anaheim · Orange County | — | — |
| Action 1st Loss Prevention INC | Wayne Alan Yost | — | (949) 661 3010 | Other | Dana Point · Orange County | — | — |