| A B C Painting | A B C Painting | — | (714) 397 2255 | Windows, patio, painters | Anaheim · Orange County | — | — |
| A B C Waterproofing | A B C Waterproofing | — | (714) 444 1111 | Other roofers | Costa Mesa · Orange County | — | — |
| A B Electric INC | Brandon William Kersey | — | (562) 522 1358 | Electricians | Yorba Linda · Orange County | — | — |
| A B Lujan Co | Antonio Barron Lujan | — | (714) 330 9350 | Other | Garden Grove · Orange County | — | — |
| A B M Heating & A / C INC | Mohamad Ahmad El-Ayoubi | — | (800) 422 6482 | HVAC | La Habra · Orange County | — | — |
| A B Ventures INC | Aaron Fleck Chennells | — | (949) 283 4696 | GC, remodel, ADU | San Clemente · Orange County | — | — |
| A Better Blind And Drapery | A Better Blind And Drapery | — | (949) 498 3212 | Other | Rancho Mission Viejo · Orange County | — | — |
| A C & R Construction Plumbing & Electrical | Robert Ramirez Salas | — | (714) 602 0001 | Electricians | La Habra · Orange County | — | — |
| A C Air Repair INC | Javier Nunez | — | (657) 900 6613 | HVAC | Orange · Orange County | — | — |
| A C Construction | Alex Quiroz Comparan | — | (949) 291 5372 | GC, remodel, ADU | San Clemente · Orange County | — | — |
| A C Cool INC | Paul Allen Delvaglio | — | (714) 532 2447 | HVAC | Orange · Orange County | — | — |
| A C Landscape INC | Daniel James Reynolds | — | (949) 636 2101 | Windows, patio, painters | Mission Viejo · Orange County | — | — |
| A C Lopez Construction INC | Amber Christina Lopez | — | (858) 263 4197 | GC, remodel, ADU | San Juan Capistrano · Orange County | — | — |
| A C Norton Heating And Air | Erick Charles Norton | — | (949) 355 2473 | HVAC | Huntington Beach · Orange County | — | — |
| A C P Painting INC | Adron Eugene Iii Collie | — | (714) 801 8379 | Windows, patio, painters | Yorba Linda · Orange County | — | — |
| A C Pitts Contracting INC DBA Tractor Works | Kevin Gary Pitts | — | (714) 391 7192 | Other | Santa Ana · Orange County | — | — |
| A C Plumbing LLC | Alfonso Castro | — | (714) 931 0715 | Other | Santa Ana · Orange County | — | — |
| A C Plumbing Solutions | A C Plumbing Solutions | — | (714) 396 9526 | Other | Buena Park · Orange County | — | — |
| A C Pozos Electric Corporation | Anthony Curtis Pozos | — | (714) 546 0366 | Electricians | Costa Mesa · Orange County | — | — |
| A C R Electrical | Brian Hung Nguyen | — | (714) 981 4631 | Electricians | Santa Ana · Orange County | — | — |
| A C R Painting And Home Improvement | Arnulfo Rodriguez Contreras | — | (949) 510 4430 | GC, remodel, ADU | San Juan Capistrano · Orange County | — | — |
| A C W Construction | Michael James Wagner | — | (714) 404 4224 | GC, remodel, ADU | Yorba Linda · Orange County | — | — |
| A Clear Choice Sand And Water Blasting | Scott Alan Belnap | — | (714) 287 9555 | Other | San Clemente · Orange County | — | — |
| A Cut Above Construction | Kuchczynski Mark | — | (949) 272 6969 | GC, remodel, ADU | Costa Mesa · Orange County | — | — |
| A Cut Above Landscape Troubleshooting | A Cut Above Landscape Troubleshooting | — | (949) 642 6948 | Windows, patio, painters | Costa Mesa · Orange County | — | — |
| A D A Construction Services Co | Roger Loyd Eden | — | (714) 966 9390 | GC, remodel, ADU | Santa Ana · Orange County | — | — |
| A D C O Construction | Dominguez Contreras Adrian | — | (714) 650 6528 | GC, remodel, ADU | Orange · Orange County | — | — |
| A D Electric | Christopher Anthony Emmanuel | — | (619) 436 1997 | GC, remodel, ADU | Irvine · Orange County | — | — |
| A D G Tile & Stone | Aaron Dixon Gayer | — | (562) 458 9633 | Other | Anaheim · Orange County | — | — |
| A D Heating & Air | A D Heating & Air | — | (714) 651 1492 | HVAC | Orange · Orange County | — | — |
| A D R Garage Doors | A D R Garage Doors | — | (562) 900 2998 | Other | Cypress · Orange County | — | — |
| A D Roofing | Diodoro Alejandro | — | (714) 478 5072 | Other roofers | Buena Park · Orange County | — | — |
| A D Tony Cantelmo Development | A D Tony Cantelmo Development | — | (714) 313 7413 | GC, remodel, ADU | Anaheim · Orange County | — | — |
| A David Construction | Amin Hector David | — | (714) 553 9700 | GC, remodel, ADU | Anaheim · Orange County | — | — |
| A Doors Window & Screen INC | Mark Richard Simons | — | (949) 548 1191 | Windows, patio, painters | Costa Mesa · Orange County | — | — |
| A E I Technologies | Edwin Mark Elder | — | (949) 650 7304 | Electricians | Costa Mesa · Orange County | — | — |
| A E W Electric INC | Arthur Edmund Wolf | — | (949) 291 3386 | Electricians | Ladera Ranch · Orange County | — | — |
| A Electrical | Zazz Anh Nguyen | — | (714) 448 4286 | Electricians | Westminster · Orange County | — | — |
| A Espinosa Construction | Angel Salgado Espinosa | — | (714) 863 9672 | GC, remodel, ADU | Garden Grove · Orange County | — | — |
| A Flow Rain Gutters | A Flow Rain Gutters | — | (714) 960 1207 | Other | Huntington Beach · Orange County | — | — |