| Akjohnston Group LLC | Joseph Raymond Sherbanee | — | (866) 212 2192 | Other | Anaheim · Orange County | — | — |
| Al Lowry Painting | Al Lowry Painting | — | (949) 230 6974 | Windows, patio, painters | Mission Viejo · Orange County | — | — |
| Al Pahlavanan | Al Pahlavanan | — | (949) 292 6762 | GC, remodel, ADU | Irvine · Orange County | — | — |
| Al Pahlavanan | Al Pahlavanan | — | (949) 371 6161 | Other | Irvine · Orange County | — | — |
| Al Painting | Al Painting | — | (714) 697 7085 | Windows, patio, painters | Santa Ana · Orange County | — | — |
| Al's Engineering INC | Guillen Alvaro | — | (949) 208 1932 | Other | Laguna Niguel · Orange County | — | — |
| Al's Finish Carpentry | Al's Finish Carpentry | — | (714) 818 3041 | GC, remodel, ADU | Santa Ana · Orange County | — | — |
| Al's Flooring & Sons INC | Verduzco Al | — | (714) 612 2861 | Other | Santa Ana · Orange County | — | — |
| Al's Professional Painting Company | Alcides Adan Tobar Vargas | — | (949) 291 6494 | Windows, patio, painters | Lake Forest · Orange County | — | — |
| Al-omar Construction Co | Abdel-jabbar Jamal Al-omar | — | (714) 396 2160 | GC, remodel, ADU | Costa Mesa · Orange County | — | — |
| Ala Construction | Lawrence Jean Amado | — | (949) 279 1771 | GC, remodel, ADU | Capistrano Beach · Orange County | — | — |
| Alabout Plumbing INC | Louie Alonzo Tamayo | — | (866) 914 3346 | Other | Garden Grove · Orange County | — | — |
| Alabout Plumbing J & C INC | Tinoco Jose Sanchez | — | (714) 767 3668 | Other | Anaheim · Orange County | — | — |
| Aladdin Tile & Marble | Aladdin Tile & Marble | — | (714) 599 4977 | Other | Anaheim · Orange County | — | — |
| Alakhras Salim | Alakhras Salim | — | (714) 719 0687 | GC, remodel, ADU | Buena Park · Orange County | — | — |
| Alan Charles Christensen | Alan Charles Christensen | — | (714) 348 1255 | GC, remodel, ADU | Fullerton · Orange County | — | — |
| Alan H Tran | Alan H Tran | — | (714) 277 6710 | Other | Huntington Beach · Orange County | — | — |
| Alan Jensen | Alan Jensen | — | (562) 712 0524 | Other | Brea · Orange County | — | — |
| Alan Joseph Pirruccello DBA Pirruccello Construction | Alan Joseph Pirruccello | — | (714) 269 3714 | GC, remodel, ADU | Orange · Orange County | — | — |
| Alan Plummer | Alan Plummer | — | (714) 899 4202 | Windows, patio, painters | Huntington Beach · Orange County | — | — |
| Alan Russell Christy | Alan Russell Christy | — | (949) 370 9196 | Electricians | San Juan Capistrano · Orange County | — | — |
| Alan Smith Pool Plastering INC DBA H2o Leak Pros | Alan Morris Smith | — | (714) 628 9494 | Windows, patio, painters | Orange · Orange County | — | — |
| Alan's Painting & Decorating | Alan's Painting & Decorating | — | (714) 561 7891 | Windows, patio, painters | Santa Ana · Orange County | — | — |
| Alanes Professional Painting | Alanes Professional Painting | — | (714) 604 6677 | Windows, patio, painters | Santa Ana · Orange County | — | — |
| Alarcon Waterproofing & Deck Systems | Alarcon Waterproofing & Deck Systems | — | (562) 477 5267 | Other roofers | La Habra · Orange County | — | — |
| Alari Landscape Construction | Christopher Louis Santulis | — | (949) 388 6600 | Windows, patio, painters | San Juan Capistrano · Orange County | — | — |
| Alarm Central INC | James Michael Helsel | — | (949) 768 7768 | Electricians | Irvine · Orange County | — | — |
| Alarm Engineering Services | William Homer Jr Armet | — | (714) 814 3497 | Electricians | Anaheim · Orange County | — | — |
| Alarm Fire Protection INC | Carol Anna Carri | — | (714) 998 1101 | Alarm and generators | Orange · Orange County | — | — |
| Alas And Bravo | Arturo Jeronimo Garcia | alas.and.bravo@gmail.com | (949) 522 0266 | Other roofers | Irvine · Orange County | — | — |
| Alaska H V A C | Alaska H V A C | — | (949) 205 3644 | HVAC | San Juan Capistrano · Orange County | — | — |
| Alaska Water Products INC | John Barry Kennedy | — | (949) 218 8169 | Other | San Clemente · Orange County | — | — |
| Alba Plastering INC | Alba Johnny | — | (714) 535 1245 | Other | Anaheim · Orange County | — | — |
| Albatec Heating And Air | Albatec Heating And Air | — | (562) 351 9059 | HVAC | Westminster · Orange County | — | — |
| Albert Air INC | Nicholas Paul Albert | — | (714) 526 6368 | HVAC | Anaheim · Orange County | — | — |
| Albert E Plaxton DBA Plaxton Concrete | Plaxton Concrete | — | (760) 953 4501 | Other | San Clemente · Orange County | — | — |
| Albert Kang Painting | Albert Kang Painting | — | (562) 691 4506 | Windows, patio, painters | La Habra · Orange County | — | — |
| Albert Michael Arciero | Albert Michael Arciero | — | (949) 461 7030 | GC, remodel, ADU | Foothill Ranch · Orange County | — | — |
| Albert W Kohler Company | Albert William Kohler | — | (619) 871 1591 | GC, remodel, ADU | San Clemente · Orange County | — | — |
| Alberto Efrain Ramirez | Alberto Efrain Ramirez | — | (714) 401 1748 | Other | Westminster · Orange County | — | — |