| Alex Orozco Construction | Juarezorozco Alejandro | — | (323) 422 6773 | GC, remodel, ADU | San Bernardino · San Bernardino County | — | — |
| Alex Solutions Plumbing Vip | Alex Solutions Plumbing Vip | — | (951) 269 0707 | Other | Hesperia · San Bernardino County | — | — |
| Alex Superb Painting Co | Arias Alejandro Bautista | — | (909) 313 7349 | Windows, patio, painters | Hesperia · San Bernardino County | — | — |
| Alex Vega | Alex Vega | — | (909) 837 0167 | GC, remodel, ADU | Chino Hills · San Bernardino County | — | — |
| Alex Villalobos Fire Protection | Alex Villalobos Fire Protection | — | (909) 503 5322 | Other | Big Bear City · San Bernardino County | — | — |
| Alex Vizcarra Construction | Alexander Thomas Vizcarra | — | (760) 408 1990 | GC, remodel, ADU | Yucca Valley · San Bernardino County | — | — |
| Alex Windows INC | Luna Alejandro | — | (909) 855 1181 | Windows, patio, painters | Fontana · San Bernardino County | — | — |
| Alexa's Maintenance INC | Jose Luis Olayo Lozano | — | (747) 724 7948 | GC, remodel, ADU | San Bernardino · San Bernardino County | — | — |
| Alexander Frias Painting | Alexander Frias Painting | — | (760) 987 4979 | Windows, patio, painters | Victorville · San Bernardino County | — | — |
| Alexander Installation & Technology Services LLC | Christopher Alexander Hudiburgh | — | (888) 777 3151 | Other | Ontario · San Bernardino County | — | — |
| Alexander Land Clearing INC | Larry Ray Alexander | — | (310) 863 5230 | Other | Chino · San Bernardino County | — | — |
| Alexander Polston | Alexander Polston | — | (909) 738 2597 | Other | Crestline · San Bernardino County | — | — |
| Alexandru Lapos | Alexandru Lapos | — | (818) 388 1468 | Other | Ontario · San Bernardino County | — | — |
| Alexson's AC & Heating Solutions INC | Arriaga Alejandro Castillo | — | (714) 597 2189 | HVAC | Redlands · San Bernardino County | — | — |
| Alfa Power Electric | Isaac Alexander Alfaro | — | (909) 244 2004 | Electricians | Ontario · San Bernardino County | — | — |
| Alfa Y Omega Construction INC | Del Valle Arturo Ramirez | — | (209) 329 4355 | GC, remodel, ADU | Big Bear Lake · San Bernardino County | — | — |
| Alfonso Aguirre - Barraza | Alfonso Aguirre - Barraza | — | (951) 233 1922 | GC, remodel, ADU | Montclair · San Bernardino County | — | — |
| Alfonso Gonzalez Jr | Alfonso Gonzalez Jr | — | (909) 248 5985 | Other | Ontario · San Bernardino County | — | — |
| Alfonso's Tree Service INC | Lopez Alfonso | — | (909) 633 8715 | Tree | Chino · San Bernardino County | — | — |
| Alfonzo Esquivel Nieto | Alfonzo Esquivel Nieto | — | (951) 384 9546 | Other | Phelan · San Bernardino County | — | — |
| Alfred Mendoza | Alfred Mendoza | — | (213) 999 1920 | Electricians | Rialto · San Bernardino County | — | — |
| Alfred Signs | Alfred Signs | — | (909) 823 6680 | Other | Fontana · San Bernardino County | — | — |
| Alfredo Flores | Alfredo Flores | business@9seven3.com | (909) 556 4881 | GC, remodel, ADU | San Bernardino · San Bernardino County | — | — |
| Alfredo Fuentes Arcos | Alfredo Fuentes Arcos | — | (714) 605 6593 | GC, remodel, ADU | Fontana · San Bernardino County | — | — |
| Alfredo Villanueva Electrical Services | Jose Alfredo Villanueva | — | (909) 531 3567 | Electricians | San Bernardino · San Bernardino County | — | — |
| Ali Desert Flooring | Ali Desert Flooring | — | (760) 601 5684 | GC, remodel, ADU | Yucca Valley · San Bernardino County | — | — |
| Alig Electric Co | John Christopher Alig | — | (760) 569 8621 | Electricians | Apple Valley · San Bernardino County | — | — |
| Alison Service Company INC | Michael Anthony Ii Bandas | — | (888) 314 6230 | Electricians | Hesperia · San Bernardino County | — | — |
| Aljohn Builders | Aljohn Builders | — | (909) 319 7380 | GC, remodel, ADU | Ontario · San Bernardino County | — | — |
| All - In - One Air Conditioning & Heating | Vazquez Carino Reyes | — | (909) 709 6675 | HVAC | Redlands · San Bernardino County | — | — |
| All - In Plumbing Care INC | Elder Telon | — | (909) 642 1630 | Windows, patio, painters | Bloomington · San Bernardino County | — | — |
| All - N - One Maintenance | Glenn Alpo Russell | — | (909) 946 0423 | GC, remodel, ADU | Oak Hills · San Bernardino County | — | — |
| All - Right Roofing LLC | Ronnie Eligio Forrest | allrightroofingjordan@gmail.com | (909) 984 2671 | Other roofers | Ontario · San Bernardino County | — | — |
| All - Tech Construction INC | Sergio Valdez | — | (626) 608 8608 | GC, remodel, ADU | Rancho Cucamonga · San Bernardino County | — | — |
| All - Ways Tile INC | David J Williams | — | (909) 518 5558 | Other | Chino · San Bernardino County | — | — |
| All About Roofing | James Mike Morrison | — | (760) 261 2807 | Other roofers | Oak Hills · San Bernardino County | — | — |
| All About Splicing LLC | Bryan Derrick Shadden | — | (909) 659 5145 | Other | San Bernardino · San Bernardino County | — | — |
| All Aces Backflow | Jared Stephen Heid | — | (877) 812 2660 | Other | Rancho Cucamonga · San Bernardino County | — | — |
| All Air Masters INC | Francisco Javier Cruz | — | (909) 399 3222 | HVAC | Upland · San Bernardino County | — | — |
| All America General Contracting INC | Adrian Alejandro Ortega | — | (909) 484 8272 | GC, remodel, ADU | Rancho Cucamonga · San Bernardino County | — | — |