| Alexanders Corp | Flores Gabriela Carrera | — | (714) 873 9532 | Windows, patio, painters | Riverside · Riverside County | — | — |
| Alexandra Alina Trejo DBA Easy Fix Garage Door | Easy Fix Garage Door | — | (760) 424 2494 | Other | Palm Desert · Riverside County | — | — |
| Alexx Pachon | Alexx Pachon | — | (951) 634 5905 | Other | Temecula · Riverside County | — | — |
| Alfa Flooring | Alfa Flooring | — | (760) 668 5038 | Other | Cathedral City · Riverside County | — | — |
| Alfa Omega Electric INC | Jorge Luis Galindo | — | (310) 622 0349 | Electricians | Moreno Valley · Riverside County | — | — |
| Alfa Omega Electrical Construction | Kulik Martin | — | (951) 283 4245 | Electricians | Temecula · Riverside County | — | — |
| Alfaro Construction INC | Jose Manuel Alfaro | — | (714) 235 4821 | GC, remodel, ADU | Banning · Riverside County | — | — |
| Alfonso Boyer Construction LLC | Boyer Alfonso | — | (760) 328 0031 | GC, remodel, ADU | Cathedral City · Riverside County | — | — |
| Alfonso's Concrete | Alfonso's Concrete | — | (909) 938 5737 | Other | Sun City · Riverside County | — | — |
| Alfred Anthony Simental | Alfred Anthony Simental | — | (909) 228 2079 | Other | Corona · Riverside County | — | — |
| Alfred Gomez Estrada Jr | Alfred Gomez Estrada Jr | — | (951) 683 1921 | Other | Riverside · Riverside County | — | — |
| Alfred Medrano DBA Am Excavation | Alfred Medrano DBA Am Excavation | — | (951) 322 5021 | Other | Wildomar · Riverside County | — | — |
| Alfredo Balandra | Alfredo Balandra | — | (951) 378 8577 | Other | Wildomar · Riverside County | — | — |
| Alfredo Sanchez Botello | Alfredo Sanchez Botello | — | (760) 899 5980 | GC, remodel, ADU | Coachella · Riverside County | — | — |
| Alfredo Tafoya's Construction | Tafoya Alfredo | — | (951) 204 5805 | GC, remodel, ADU | Hemet · Riverside County | — | — |
| Alg Heating & Cooling | Alg Heating & Cooling | — | (714) 769 4590 | HVAC | Norco · Riverside County | — | — |
| Alianza Engineering | Agustin Alejandro | — | (909) 406 0856 | Other | Beaumont · Riverside County | — | — |
| Alien Built Construction | Ceja Jesus | — | (951) 907 2642 | GC, remodel, ADU | Banning · Riverside County | — | — |
| Aligned Electric INC | Damien Omar Ramos | — | (909) 957 5943 | Electricians | Perris · Riverside County | — | — |
| Alin Claudiu Arsenov | Alin Claudiu Arsenov | — | (714) 299 7021 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Alisia Alvaro | Alisia Alvaro | — | (951) 224 4086 | Windows, patio, painters | Perris · Riverside County | — | — |
| Alisos Tree Service INC | Sergio Duarte | — | (760) 702 5378 | Windows, patio, painters | Indio · Riverside County | — | — |
| All - Intercity Plumbing | All - Intercity Plumbing | — | (760) 671 5837 | Other | N Palm Springs · Riverside County | — | — |
| All - Phases International | Sohl Georg | — | (909) 559 7106 | Electricians | Calimesa · Riverside County | — | — |
| All - Pro Drywall INC | Alfredo Chavira Rodriguez | — | (951) 699 0123 | Other | Murrieta · Riverside County | — | — |
| All - Star Air Conditioning | All - Star Air Conditioning | — | (760) 550 1023 | HVAC | La Quinta · Riverside County | — | — |
| All - Star Window Covering | All - Star Window Covering | — | (714) 396 6642 | Other | Corona · Riverside County | — | — |
| All - Weather Awnings | All - Weather Awnings | — | (760) 360 9262 | Other | Palm Desert · Riverside County | — | — |
| All A / C & Heating INC | Drew Wesley Middleton | — | (909) 557 3023 | HVAC | Beaumont · Riverside County | — | — |
| All About Air | All About Air | — | (760) 578 7913 | HVAC | La Quinta · Riverside County | — | — |
| All About Glass And Screens INC | Jean Thora Copeland | — | (951) 789 8357 | Windows, patio, painters | Riverside · Riverside County | — | — |
| All About Tile | All About Tile | — | (760) 275 6273 | Other | Desert Hot Springs · Riverside County | — | — |
| All Access Air LLC DBA J F Heating And Air Conditioning | Jorge Alejandro Flores | — | (951) 379 6526 | HVAC | Murrieta · Riverside County | — | — |
| All America's Pool Service And Repairs | Herrera Adrian | — | (760) 883 0964 | Pool | Mecca · Riverside County | — | — |
| All American And Western Ranch Fence Co | Robert Anthony Lopes | — | (951) 403 3623 | Other | Murrieta · Riverside County | — | — |
| All American Asphalt | Michael Scott Farkas | — | (951) 736 7600 | Other | Corona · Riverside County | — | — |
| All American Construction & Restoration | Dumitru Cristian Baias | — | (951) 751 4333 | GC, remodel, ADU | Lake Elsinore · Riverside County | — | — |
| All American Door Company | Tommy Gaines Kammerer | — | (909) 460 0907 | Other | Riverside · Riverside County | — | — |
| All American Fire Systems | All American Fire Systems | — | (714) 476 3169 | Electricians | Lake Elsinore · Riverside County | — | — |
| All American Heating & Air INC | Tomas Israel Sanchez Sanchez | — | (619) 721 9561 | HVAC | Menifee · Riverside County | — | — |