| American Diversified Contractors INC | James Patrick Neal | — | (714) 625 8739 | Windows, patio, painters | Huntington Beach · Orange County | — | — |
| American Dream Construction Clean Up | Brito Isidro Martinez | — | (949) 874 9371 | Other | Laguna Beach · Orange County | — | — |
| American Elevator Services INC | Andrew Frank Nepi | — | (949) 388 4657 | Other | Laguna Niguel · Orange County | — | — |
| American Elite Contracting Co LLC | Craig Steven Grimes | — | (562) 239 5669 | GC, remodel, ADU | Cypress · Orange County | — | — |
| American Environmental And Associates INC | Gerald Song Adkerson | — | (714) 923 0000 | GC, remodel, ADU | Laguna Hills · Orange County | — | — |
| American Fabrication Concepts | Jordan Jonathan Postal | — | (949) 743 4023 | Other | Dana Point · Orange County | — | — |
| American Family Construction & Remodeling INC | Gabriel W Odisho | — | (949) 254 8337 | GC, remodel, ADU | Laguna Beach · Orange County | — | — |
| American Floor Covering And Remodeling | American Floor Covering And Remodeling | — | (714) 743 3688 | GC, remodel, ADU | Mission Viejo · Orange County | — | — |
| American Flooring INC | James Michael Kormos | — | (949) 642 0919 | Other | Newport Beach · Orange County | — | — |
| American Geotechnical | Arumugam Alvappillai | — | (714) 685 3900 | Other | Yorba Linda · Orange County | — | — |
| American Heating & Cooling | American Heating & Cooling | — | (408) 775 3028 | HVAC | Mission Viejo · Orange County | — | — |
| American Heating And Air Conditioning | American Heating And Air Conditioning | — | (714) 961 1415 | HVAC | Yorba Linda · Orange County | — | — |
| American Home Heating & Air | American Home Heating & Air | — | (854) 252 5937 | HVAC | Lake Forest · Orange County | — | — |
| American Home Solutions | Joseph Robert Errington-Gaffino | — | (714) 231 7961 | GC, remodel, ADU | Yorba Linda · Orange County | — | — |
| American Housing Partners INC | Sergio Saturnino Alvarez | — | (949) 933 7461 | GC, remodel, ADU | Yorba Linda · Orange County | — | — |
| American Independent Security | David W Thomas | — | (714) 956 2342 | Electricians | Anaheim · Orange County | — | — |
| American Integrated Resources INC | Thomas Clark Stevens | — | (714) 921 4100 | GC, remodel, ADU | Orange · Orange County | — | — |
| American International Engineering (aie) | Joseph Allen Sturgeon | — | (949) 228 4882 | GC, remodel, ADU | Anaheim · Orange County | — | — |
| American Iron Designs Corporation | Uriel Guadarrama | — | (714) 240 7726 | Other | Santa Ana · Orange County | — | — |
| American Leak Detection #0108 | American Leak Detection #0108 | — | (714) 836 8477 | Pool | Anaheim · Orange County | — | — |
| American Leak Detection Of San Diego | Philip Sherman Meckley | — | (714) 836 8477 | Other | Anaheim · Orange County | — | — |
| American Made Roofing | Damian Javier Felipe | — | (714) 248 4475 | Other roofers | Santa Ana · Orange County | — | — |
| American Pacific Electric | Michael David Skoviak | mdskov@aol.com | (714) 586 1358 | Electricians | Huntington Beach · Orange County | — | — |
| American Patriot Construction | Charles James Weber | — | (562) 393 0444 | Other | Garden Grove · Orange County | — | — |
| American Pipedream Services 24/7 | Alfredo Salazar | — | (714) 313 3960 | Other | Santa Ana · Orange County | — | — |
| American Plumbing | American Plumbing | — | (949) 545 1078 | Other | Laguna Hills · Orange County | — | — |
| American Plumbing INC | Richard Paul Sr Mc Keown | — | (949) 499 2401 | Other | Laguna Beach · Orange County | — | — |
| American Plumbing Service | Carl Peter Ludwig | — | (562) 235 2598 | Other | Yorba Linda · Orange County | — | — |
| American Pool & Spa Repair | American Pool & Spa Repair | — | (949) 367 6664 | Pool | Mission Viejo · Orange County | — | — |
| American Powerplant Services | Anthony Rudder | — | (714) 403 6434 | Other | Newport Beach · Orange County | — | — |
| American Product Coatings | Ismael Lopez Marquez | — | (714) 948 4933 | Other | Orange · Orange County | — | — |
| American Remodeling & Construction | Jose Roberto Ortega Martinez | — | (657) 239 1768 | GC, remodel, ADU | Garden Grove · Orange County | — | — |
| American Remodeling & Construction Corp | Malak Ghobrial Hanna | — | (562) 412 6666 | GC, remodel, ADU | Yorba Linda · Orange County | — | — |
| American Renavatu Builders Corp | Elisa Ibarra | americanrenavatubuilders@gmail.com | (714) 486 9818 | GC, remodel, ADU | Garden Grove · Orange County | — | — |
| American Restore INC | James Lawrence Andrews | — | (714) 893 9080 | Other roofers | Huntington Beach · Orange County | — | — |
| American Roofing Company | Larry Jackson Jr Bledsoe | — | (714) 956 9030 | Other roofers | Anaheim · Orange County | — | — |
| American Safe & Vault INC | Adam David Garcia | — | (888) 669 1296 | Other | Santa Ana · Orange County | — | — |
| American Standard Flooring | American Standard Flooring | — | (949) 855 9191 | Other | Laguna Niguel · Orange County | — | — |
| American Star Plumbing | American Star Plumbing | — | (714) 893 7000 | Other | Huntington Beach · Orange County | — | — |
| American Steel | American Steel | — | (714) 422 8748 | Other | Anaheim · Orange County | — | — |