| All American Restoration & Mitigation Water | Fire | Mold | All American Restoration & Mitigation Water | Fire | Mold | — | (909) 317-3419 | Restoration | Redlands · Orange County | — | — |
| All American Statewide Security Guards - Company Located In Oc - Security Guard Companies | All American Statewide Security Guards - Company Located In Oc - Security Guard Companies | — | (949) 396-1835 | Alarm and generators | Irvine · Orange County | — | — |
| All Angles INC | Jason Kleiser Fraser | — | (949) 547 5507 | GC, remodel, ADU | Mission Viejo · Orange County | — | — |
| All Around Construction | Spencer Alfred Garrett | — | (714) 832 8024 | GC, remodel, ADU | Tustin · Orange County | — | — |
| All Around Plumbing | All Around Plumbing | — | (323) 443 5304 | Other | Huntington Beach · Orange County | — | — |
| All Around The Clock Plumbing | All Around The Clock Plumbing | — | (714) 448 1539 | Other | Mission Viejo · Orange County | — | — |
| All Around Underground Contractors INC | Bobbie Jean Barry | — | (714) 988 7862 | Other | Orange · Orange County | — | — |
| All Around Window Film LLC | Alejandro Camacho | — | (714) 471 8621 | Other | Santa Ana · Orange County | — | — |
| All Aspects Construction | Nikbakht Kamran Nouri | — | (949) 795 6706 | GC, remodel, ADU | Irvine · Orange County | — | — |
| All Brothers Construction Windows | Gilbert Michael Martin | — | (949) 357 5304 | Windows, patio, painters | Mission Viejo · Orange County | — | — |
| All Care Plumbing INC | Roman Amador Urbieta | — | (714) 883 5057 | GC, remodel, ADU | Orange · Orange County | — | — |
| All Cities Electric | Robert Leo Riquier | — | (714) 901 2959 | Electricians | Garden Grove · Orange County | — | — |
| All Cities Glass | All Cities Glass | — | (714) 283 3036 | Windows, patio, painters | Orange · Orange County | — | — |
| All City Builders & Design INC DBA Entourage Home Remodeling | Ambrosio Jr Acosta | — | (714) 783 2226 | GC, remodel, ADU | Santa Ana · Orange County | — | — |
| All City Electric | Jody Jay Teal | — | (714) 847 0192 | Electricians | Huntington Beach · Orange County | — | — |
| All City Painting And Maintenance | All City Painting And Maintenance | — | (714) 222 1366 | Windows, patio, painters | Fullerton · Orange County | — | — |
| All City Security | Gilbert Munoz | — | (562) 755 2320 | Electricians | Yorba Linda · Orange County | — | — |
| All City Service Company | Matthew Jacob Fondie | — | (714) 879 0915 | Electricians | Fullerton · Orange County | — | — |
| All Climates Controlled | All Climates Controlled | — | (949) 361 4339 | HVAC | San Clemente · Orange County | — | — |
| All Coast Flooring INC | Mitchell Brandon Hendren | — | (714) 625 7668 | Other | Huntington Beach · Orange County | — | — |
| All Community Painting | Shawn Grant Mc Dowell | — | (657) 342 0101 | Windows, patio, painters | Laguna Beach · Orange County | — | — |
| All Construction | Nikov Ivan | — | (714) 606 6768 | GC, remodel, ADU | Newport Beach · Orange County | — | — |
| All Construction Job INC | Safarzadeh Rashid | raysafainfo@gmail.com | (949) 590 0027 | GC, remodel, ADU | Aliso Viejo · Orange County | — | — |
| All Counties Fire Protection INC | Robert Allen Wood | — | (949) 207 8814 | Other | Tustin · Orange County | — | — |
| All County Backflow | All County Backflow | — | (714) 642 7267 | Other | Garden Grove · Orange County | — | — |
| All County Environmental & Restoration INC | Andrew Leo Jr Zavodney | — | (714) 917 1400 | GC, remodel, ADU | Anaheim · Orange County | — | — |
| All County Garage Doors | All County Garage Doors | — | (714) 717 1405 | Other | Huntington Beach · Orange County | — | — |
| All Day Electrical | Michael George Negrete | — | (949) 445 9018 | Electricians | Laguna Hills · Orange County | — | — |
| All Days Garage Doors | Oz Harely Dean Menaged | — | (917) 935 7957 | Other | Huntington Beach · Orange County | — | — |
| All Domestic And Commercial Plumbing | Martinez Armando Perez | — | (714) 605 1799 | Other | Anaheim · Orange County | — | — |
| All Electric Service Corp | Alvin T Chung | — | (949) 512 5309 | Other | Westminster · Orange County | — | — |
| All Good Electric | Paul James Moran | — | (714) 277 2128 | Electricians | Huntington Beach · Orange County | — | — |
| All Home Improvement INC | David Samuel Hill | — | (714) 398 2890 | GC, remodel, ADU | Laguna Hills · Orange County | — | — |
| All Home Repair | All Home Repair | — | (714) 804 7329 | GC, remodel, ADU | Villa Park · Orange County | — | — |
| All In One Cleaners | All In One Cleaners | — | (714) 962 2556 | Other | Huntington Beach · Orange County | — | — |
| All In One Electric | Steven Gerome Jr Boyer | — | (714) 837 8462 | Electricians | Westminster · Orange County | — | — |
| All In One Facility Services | Andres Abel Simon Estrada | info@ndiscovered.com | (714) 705 5448 | GC, remodel, ADU | Irvine · Orange County | — | — |
| All In One Roofing Co | Reginaldo Jr Valdez | — | (714) 476 3304 | Other roofers | Brea · Orange County | — | — |
| All Inclusive Construction Services | Ruben Billy Duran | — | (714) 987 3855 | GC, remodel, ADU | Brea · Orange County | — | — |
| All Inclusive Environmental Services INC | Christopher Eugene Wernicke | — | (714) 784 6585 | Other | Brea · Orange County | — | — |