| Alnikim General Building | Alnikim General Building | — | (909) 316 9555 | GC, remodel, ADU | Corona · Riverside County | — | — |
| Alo Home Designs & Build | Oscar Antonio Ruiz Gaitan | — | (619) 451 0153 | GC, remodel, ADU | Hemet · Riverside County | — | — |
| Aloha Construction Services INC | Rosemarie Ululani| Kanehe Rose Kanehe | — | (760) 708 9141 | Other | Temecula · Riverside County | — | — |
| Aloha Landscape And Design INC | Gilbert Jr Jacobo | — | (951) 764 3577 | Windows, patio, painters | Hemet · Riverside County | — | — |
| Aloha Leisure Corp | Richard Ellsworth Sr Davenport | — | (951) 674 3320 | Pool | Lake Elsinore · Riverside County | — | — |
| Alonso Construction And Maintenance | Alonso Ernesto | — | (760) 777 5265 | GC, remodel, ADU | Cathedral City · Riverside County | — | — |
| Alonso Electric INC | Alexander Ernesto Alonso | — | (951) 966 8768 | Electricians | Riverside · Riverside County | — | — |
| Alonso Molina Ayon | Alonso Molina Ayon | — | (760) 619 9279 | Other | Coachella · Riverside County | — | — |
| Alonzo Pro Painting INC | Alonzo Nicolas Hernandez Miguel | — | (951) 347 5242 | Windows, patio, painters | Riverside · Riverside County | — | — |
| Alpaca Enterprises INC | Chad Christian Hansen | — | (909) 322 3848 | Other | Corona · Riverside County | — | — |
| Alpha & Omega Pavers INC | Adam Cuevas | — | (909) 795 8474 | Other | Calimesa · Riverside County | — | — |
| Alpha And Omega Best Builders INC | Ronald Ray Young | — | (888) 933 0833 | GC, remodel, ADU | Lake Elsinore · Riverside County | — | — |
| Alpha And Omega Plumbing Company | George Manuel Valencia | — | (951) 295 4363 | Other | Riverside · Riverside County | — | — |
| Alpha And Omega Remodeling | Domingo Fermin Gomez Castaneda | — | (951) 250 5824 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Alpha Coatings INC | Uriostegui Cantero Rey | — | (714) 588 5601 | Windows, patio, painters | Riverside · Riverside County | — | — |
| Alpha Construction | Valadez Salvador | — | (951) 743 1457 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Alpha Demolition Contractors INC | Sonia Erlinda Quezada | — | (310) 720 4744 | Other | Hemet · Riverside County | — | — |
| Alpha Electric | Eric Dale Stickles | — | (760) 275 0578 | Electricians | Rancho Mirage · Riverside County | — | — |
| Alpha Environmental Engineering Construction | Douglas Lavelle Parker | — | (951) 545 7374 | Other | Corona · Riverside County | — | — |
| Alpha Framing | Alpha Framing | — | (760) 989 3183 | Other | Thermal · Riverside County | — | — |
| Alpha H2o Usa | Alpha H2o Usa | — | (888) 407 0603 | Other | Perris · Riverside County | — | — |
| Alpha Made Construction INC | Michael Eduardo Duran | — | (626) 379 0725 | GC, remodel, ADU | Murrieta · Riverside County | — | — |
| Alpha Omega Construction Design | Jason Cameron Koch | — | (760) 895 4422 | GC, remodel, ADU | La Quinta · Riverside County | — | — |
| Alpha Paving | Ceja Martin Ceja | — | (951) 732 3904 | Other | Moreno Valley · Riverside County | — | — |
| Alpha Plumbing INC | Austin Robert Ristaino | — | (760) 218 7309 | Other | Palm Desert · Riverside County | — | — |
| Alpha Pools INC | Steve Michael Clark | — | (951) 813 8876 | Pool | Hemet · Riverside County | — | — |
| Alpha Steel Corp | Garcia Gerardo Hernandez | — | (208) 602 1373 | Other | Nuevo · Riverside County | — | — |
| Alpha West Construction INC | Nerses Jr Toprakjian | info@alphawestconstruction.com | (909) 548 9027 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Alphacomm Electrical | Toby Michael Woulf | — | (951) 813 9494 | Electricians | Temecula · Riverside County | — | — |
| Alphacomm Voice And Data | Alphacomm Voice And Data | — | (951) 738 1771 | Other | Corona · Riverside County | — | — |
| Alps Electric | Michael Fred Alps | — | (951) 206 1911 | Electricians | Cherry Valley · Riverside County | — | — |
| Als Empire Lighting & Electric INC | Jesus Alfredo Benitez Bravo | — | (760) 578 6572 | Electricians | Coachella · Riverside County | — | — |
| Alses Drywall INC | Alejandro Sesmas | — | (714) 357 3598 | Other | Corona · Riverside County | — | — |
| Alson General Construction | Frederick Alson | — | (949) 705 7667 | Electricians | Corona · Riverside County | — | — |
| Alta Construction Incorporated | David Richard Mcpheeters | — | (951) 799 6082 | GC, remodel, ADU | Corona · Riverside County | — | — |
| Alta Contracting | Mario Steven Aroz | — | (951) 817 4386 | GC, remodel, ADU | Corona · Riverside County | — | — |
| Alta Finish & Stair INC | Victor Manuel Martinez | — | (951) 402 0000 | GC, remodel, ADU | Moreno Valley · Riverside County | — | — |
| Alta Sierra Windows | Alta Sierra Windows | — | (626) 230 1150 | Windows, patio, painters | Norco · Riverside County | — | — |
| Alta Verde Builders INC | Russell Lee Jones | — | (760) 200 6607 | GC, remodel, ADU | Palm Desert · Riverside County | — | — |
| Altas Awning LLC | Paulino Ivan Gutierrez | — | (760) 289 8053 | Other | Palm Springs · Riverside County | — | — |