| Aguilar Concrete Construction Services | Tomas Jr Aguilar | — | (760) 625 9879 | Other | Coachella · Riverside County | — | — |
| Aguilar Construction | Robert John Aguilar | — | (951) 629 7803 | GC, remodel, ADU | Banning · Riverside County | — | — |
| Aguilar Construction - Aca | Julio Caesar Aguilar | — | (562) 419 6409 | GC, remodel, ADU | Bermuda Dunes · Riverside County | — | — |
| Aguilare's Flooring Corp | Aguilar Arturo Arellano | — | (951) 537 7197 | Other | San Jacinto · Riverside County | — | — |
| Aguilera's Landscape INC | Juan Pablo Aguilera Arroyo | — | (760) 899 7692 | Windows, patio, painters | Indio · Riverside County | — | — |
| Aguirre Construction | Luis George Aguirre | aguirre.const@gmail.com | (951) 452-6208 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Aguirre Drywall Corporation | David Aguirre | — | (951) 422 4347 | Other | Riverside · Riverside County | — | — |
| Aguirre Jesus Escobar | Aguirre Jesus Escobar | — | (951) 756 4466 | Other | Perris · Riverside County | — | — |
| Aguirre's Custom Cabinets & Finish Carpentry | Adam Carlos Aguirre | — | (951) 206 1463 | Other | Corona · Riverside County | — | — |
| Agustin Ahumada General Contracting | Agustin Piceno Ahumada | — | (619) 210 4818 | GC, remodel, ADU | Menifee · Riverside County | — | — |
| Agustin Valdovinos | Agustin Valdovinos | — | (760) 828 6932 | Electricians | Corona · Riverside County | — | — |
| Ah Painting | Ah Painting | — | (619) 348 0805 | Windows, patio, painters | Indio · Riverside County | — | — |
| Ahc Fire Alarm | Vicki Ann Flores | — | (760) 797 7274 | Electricians | Palm Desert · Riverside County | — | — |
| Ahcor 3 Mechanical Plumbing | Ahcor 3 Mechanical Plumbing | — | (760) 620 2576 | Other | Coachella · Riverside County | — | — |
| Ahoy Air - Conditioning Heating & Plumbing | Soucek Zdenek | — | (760) 799 1990 | HVAC | Indio · Riverside County | — | — |
| Ahsan Khan Electric | Ahsan Jalil Khan | — | (951) 742 9417 | Electricians | Riverside · Riverside County | — | — |
| Ai4 Design And Construction | Marios Panos Ignelis | — | (707) 633 8082 | GC, remodel, ADU | Murrieta · Riverside County | — | — |
| Aia Builders INC | Lupe Chavarria Morua | — | (626) 763 0119 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Aian Corp | Michael Steven Johnson | — | (714) 235 8861 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Aid Plumbing | Miguel Angel Ramirez | — | (858) 229 5020 | Other | Hemet · Riverside County | — | — |
| Ailm Underground INC | William Patrick Feyl | — | (206) 613 9392 | Other | Temecula · Riverside County | — | — |
| Aim Flooring | Aim Flooring | — | (626) 373 3168 | Other | Moreno Valley · Riverside County | — | — |
| Aim Plumbing California | Aim Plumbing California | — | (619) 788 7141 | Other | Hemet · Riverside County | — | — |
| Aim Rite Construction | Luis Eduardo Larrea | — | (213) 494 0282 | GC, remodel, ADU | Norco · Riverside County | — | — |
| Air Care Heating And Air Conditioning | Gary Michael Rogers | — | (951) 609 6638 | HVAC | Menifee · Riverside County | — | — |
| Air Care Mechanical | Air Care Mechanical | — | (909) 772 6120 | HVAC | Moreno Valley · Riverside County | — | — |
| Air Conditioning And Heating Services | Mallaki Zabihallah | — | (951) 956 5477 | HVAC | Murrieta · Riverside County | — | — |
| Air Conditioning Experts | Travis Edmund Naasz | — | (951) 216 5404 | HVAC | Winchester · Riverside County | — | — |
| Air Cool Tech Services | Jorge Adrian Lopez Espinoza | — | (951) 867 6693 | HVAC | Moreno Valley · Riverside County | — | — |
| Air Design & Solutions INC | Jordan Nicholas Myers | — | (951) 398 9192 | HVAC | Riverside · Riverside County | — | — |
| Air Ducks Duct Cleaning INC | Karl Norman Hoshor | — | (951) 229 1693 | Other | Corona · Riverside County | — | — |
| Air Duct Professionals Cleaning | Air Duct Professionals Cleaning | — | (951) 734 7204 | Other | Menifee · Riverside County | — | — |
| Air Experts Air Conditioning & Heating | Luis Miguel Lira | — | (760) 777 1724 | HVAC | Coachella · Riverside County | — | — |
| Air Mek | Air Mek | — | (213) 840 4281 | HVAC | Lake Elsinore · Riverside County | — | — |
| Air Plus Heating & Air Conditioning INC | Jorge Luiz Delgado Parra | — | (760) 571 7407 | HVAC | Desert Hot Springs · Riverside County | — | — |
| Air Pros Plumbing Heating And Air | Joseph Francis Griffin | — | (951) 681 1071 | HVAC | Menifee · Riverside County | — | — |
| Air Quality Specialist INC | Michael Thomas Smith | — | (951) 487 6700 | HVAC | San Jacinto · Riverside County | — | — |
| Air Repair 24/7 LLC | Daniel Warner Gonzales | — | (951) 290 1170 | HVAC | Winchester · Riverside County | — | — |
| Air Response HVAC LLC | Jose Ismael Solis | joe@airresponsehvac.com | (818) 912 2929 | HVAC | Lake Elsinore · Riverside County | — | — |
| Air Rush Heating & Air Conditioning | Julio Cesar Hernandez | — | (760) 848 8879 | HVAC | Indio · Riverside County | — | — |