| Allied Builders INC | Rebecca Amm Schwartz | — | (909) 636 8385 | GC, remodel, ADU | Chino · San Bernardino County | — | — |
| Allied Electrical And General Construction | Lofti Ayed Kakish | — | (909) 921 4591 | Electricians | Upland · San Bernardino County | — | — |
| Allied Sandblasting | Allied Sandblasting | — | (714) 423 9709 | Other | Lucerne Valley · San Bernardino County | — | — |
| Allison Brown Art | Allison Brown Art | — | (909) 709 8683 | Windows, patio, painters | Yucaipa · San Bernardino County | — | — |
| Allison Mechanical | Allison Mechanical | — | (909) 478 5633 | HVAC | Redlands · San Bernardino County | — | — |
| Allison Mechanical INC | Donald Paul Allison | — | (909) 478 5633 | HVAC | Redlands · San Bernardino County | — | — |
| Allison Plumbing | Jonathan Lee Younkman | — | (909) 987 7721 | Other | Rancho Cucamonga · San Bernardino County | — | — |
| Allowayvoltage LLC | Christerfer Adam Alloway | — | (909) 741 0245 | Electricians | Rancho Cucamonga · San Bernardino County | — | — |
| Alloy Builders LLC | Rodriguez Richard | — | (323) 855 6150 | GC, remodel, ADU | Upland · San Bernardino County | — | — |
| Alloy Welding | Alloy Welding | — | (562) 332 0708 | Other | Rancho Cucamonga · San Bernardino County | — | — |
| Allred Construction | Kelly Laren Allred | — | (909) 720 0784 | GC, remodel, ADU | Yucaipa · San Bernardino County | — | — |
| Allspark Electric INC | James Clinton Jr Robinson | — | (909) 200 3172 | Electricians | Upland · San Bernardino County | — | — |
| Allstar Activating Devices | Allstar Activating Devices | — | (909) 845 7043 | Other | Colton · San Bernardino County | — | — |
| Allstar Adu & General Builder | Allstar Adu & General Builder | — | (909) 781 9504 | GC, remodel, ADU | Ontario · San Bernardino County | — | — |
| Allstar Roofing Co | Gerald Anthony Skorupski | — | (909) 945 3173 | Other roofers | Alta Loma · San Bernardino County | — | — |
| Allsup Corporation | Kathleen Mary Sharpe | — | (909) 931 1636 | GC, remodel, ADU | Upland · San Bernardino County | — | — |
| Alltec Electric Patrol | Cruz Sebastian | — | (951) 966 1930 | Electricians | San Bernardino · San Bernardino County | — | — |
| Allwayss | Glen Arthur Perschon | — | (909) 732 3544 | Other | Ontario · San Bernardino County | — | — |
| Almaraz Custom Concrete Services INC | Almaraz Saul | — | (909) 955 4209 | Other | San Bernardino · San Bernardino County | — | — |
| Almazan Sheet Metal | Almazan Sheet Metal | — | (442) 267 6108 | Other | Phelan · San Bernardino County | — | — |
| Aloha Construction Services | Larry Charles Holmes | — | (808) 469 1768 | GC, remodel, ADU | Chino · San Bernardino County | — | — |
| Alonso Advanced Air | Alonso Advanced Air | — | (661) 405 7120 | HVAC | Hesperia · San Bernardino County | — | — |
| Alonso's Landscaping | Alonso's Landscaping | — | (909) 528 4802 | Windows, patio, painters | Yucaipa · San Bernardino County | — | — |
| Alonzo Construction | Alonzo David | — | (909) 322 9573 | GC, remodel, ADU | Highland · San Bernardino County | — | — |
| Alpha & Omega Landscaping | Alpha & Omega Landscaping | — | (760) 403 4574 | Windows, patio, painters | Apple Valley · San Bernardino County | — | — |
| Alpha & Omega Wallcovering & Paint | Flores Alejandra | — | (909) 285 8375 | Windows, patio, painters | Rialto · San Bernardino County | — | — |
| Alpha Builders INC | Karl James Vindler | — | (818) 927 7301 | GC, remodel, ADU | Victorville · San Bernardino County | — | — |
| Alpha Capital Investments LLC | Daniel Hector Rosales | — | (760) 953 5148 | GC, remodel, ADU | Apple Valley · San Bernardino County | — | — |
| Alpha Composite Systems INC | Sidney Jr Kim | — | (909) 717 5975 | Windows, patio, painters | Upland · San Bernardino County | — | — |
| Alpha Desert Plumbing | Alpha Desert Plumbing | — | (909) 957 8383 | Other | Yucca Valley · San Bernardino County | — | — |
| Alpha Electrical Specialists INC | Dylan William Stok Lane | — | (760) 331 7364 | Electricians | Big Bear City · San Bernardino County | — | — |
| Alpha Gdl Plumbing Corp | Jorge Christian Guadalajara Becerra | — | (562) 440 9845 | Other | Upland · San Bernardino County | — | — |
| Alpha Glazier | Alpha Glazier | — | (909) 586 4429 | Windows, patio, painters | Fontana · San Bernardino County | — | — |
| Alpha Insulation | Miguel Juventino Ramirez | — | (714) 787 8139 | Other | Victorville · San Bernardino County | — | — |
| Alpha Mobile Home Specialist | Gonzalez Alfredo Martinez | — | (909) 965 9037 | Other | San Bernardino · San Bernardino County | — | — |
| Alpha Omega Plumbing | Alpha Omega Plumbing | — | (626) 720 3009 | Other | Ontario · San Bernardino County | — | — |
| Alpha Roofing Company | Acosta Mario Ibarra | — | (909) 435 7576 | Other roofers | San Bernardino · San Bernardino County | — | — |
| Alpine Plumbing | Alpine Plumbing | info@alpine-plumbing.com | (909) 336 2690 | Other | Lake Arrowhead · San Bernardino County | — | — |
| Alpine Shutter Craft | Alpine Shutter Craft | — | (909) 733 3321 | Other | Redlands · San Bernardino County | — | — |
| Als Plastering | Heredia Adonai Herrera | — | (909) 788 6240 | Other | Fontana · San Bernardino County | — | — |