| Acurtech Welding Services | Salvador M Garcia | — | (714) 875 4851 | Other | Redlands · San Bernardino County | — | — |
| Acv Electric | Anthony Christian Velasquez | — | (926) 261 2015 | Electricians | Rancho Cucamonga · San Bernardino County | — | — |
| Ad America Signs | Ad America Signs | — | (909) 949 0869 | Other | Upland · San Bernardino County | — | — |
| Ad Metal Building INC | Agustin Diaz-Diaz | — | (909) 343 0210 | Other | San Bernardino · San Bernardino County | — | — |
| Adam Construction Services | Orozco Belmontes Adan | — | (951) 966 6510 | GC, remodel, ADU | Fontana · San Bernardino County | — | — |
| Adam Franklin | Adam Franklin | locksley.taylor@gmail.com | (760) 514 8007 | Other | Victorville · San Bernardino County | — | — |
| Adam Siek | Adam Siek | — | (909) 303 0583 | Other | Yucaipa · San Bernardino County | — | — |
| Adame Concrete Construction | Richard Gomez Adame | — | (909) 260 7906 | Other | San Bernardino · San Bernardino County | — | — |
| Adame Tile | Adame Tile | — | (760) 686 6211 | Other | Hesperia · San Bernardino County | — | — |
| Adams Contracting And Consulting | Tacey Joan Adams | — | (909) 835 5155 | Other | Oak Hills · San Bernardino County | — | — |
| Adams Family Plumbing LLC | Adam Jeffrey Johnson | — | (909) 567 1912 | Other | Big Bear City · San Bernardino County | — | — |
| Adan Hernandez | Adan Hernandez | — | (909) 319 4035 | GC, remodel, ADU | Upland · San Bernardino County | — | — |
| Adaptive Controls Services | Alberto Andres Perez | — | (909) 851 2364 | HVAC | Ontario · San Bernardino County | — | — |
| Aded Tile | Aded Tile | — | (909) 557 5785 | Other | Yucaipa · San Bernardino County | — | — |
| Adj Electric | Allan David Jones | — | (909) 638 8514 | Electricians | Upland · San Bernardino County | — | — |
| Adj Pool Services | Maria Del Carmen Neri | — | (951) 233 8705 | Pool | Victorville · San Bernardino County | — | — |
| Adjust Comfort Heating / Air Conditioning | Enrique Velarde Gonzalez | — | (909) 775 8161 | HVAC | San Bernardino · San Bernardino County | — | — |
| Adm Roofing INC | Jose Alberto Hernandez Beltran | — | (909) 676 1973 | Other roofers | San Bernardino · San Bernardino County | — | — |
| Admeyer Finish Carpentry | Admeyer Finish Carpentry | — | (760) 390 5199 | Other | Alta Loma · San Bernardino County | — | — |
| Adrian Edwin Rojas | Adrian Edwin Rojas | — | (626) 825 8923 | GC, remodel, ADU | Chino Hills · San Bernardino County | — | — |
| Adrian Philipp Walder | Adrian Philipp Walder | — | (949) 274 0529 | Electricians | Mentone · San Bernardino County | — | — |
| Adrian's Concrete Corp | Sixto Adrian Carrillo Urena | — | (661) 369 9325 | Other | Fontana · San Bernardino County | — | — |
| Adriels Heating & Air | Daniel Lopez | — | (909) 213 2645 | HVAC | San Bernardino · San Bernardino County | — | — |
| Adu Solutions La | Felix David Hurtado | — | (840) 229 0073 | GC, remodel, ADU | Upland · San Bernardino County | — | — |
| Advance America Coatings | Isaac Caraveo | — | (323) 677 3496 | Windows, patio, painters | San Bernardino · San Bernardino County | — | — |
| Advance Construction | Cesar Javier Higuera | — | (760) 217 6848 | GC, remodel, ADU | Ontario · San Bernardino County | — | — |
| Advance Drywall Systems | Rueda-baez Mario | — | (909) 434 6663 | Other | Phelan · San Bernardino County | — | — |
| Advance Electric | Ricardo Humberto Gudino | — | (909) 758 6196 | Electricians | Montclair · San Bernardino County | — | — |
| Advance Painting | Advance Painting | — | (760) 885 1469 | Windows, patio, painters | Oak Hills · San Bernardino County | — | — |
| Advance Teletek INC | Richard Dale Bowman | — | (909) 425 0110 | Electricians | Highland · San Bernardino County | — | — |
| Advanced Air Cleaning INC | Richard Arthur Palacios | support@okawarisushi.com | (909) 727 7201 | Other | Alta Loma · San Bernardino County | — | — |
| Advanced Alarms INC | Michael Josef Hahn | — | (909) 762 0555 | Electricians | Yucaipa · San Bernardino County | — | — |
| Advanced Comfort Mechanical | Advanced Comfort Mechanical | — | (909) 687 4714 | HVAC | Rancho Cucamonga · San Bernardino County | — | — |
| Advanced Creative Concrete INC | Miranda Tomas | — | (909) 496 4964 | Other | Yucaipa · San Bernardino County | — | — |
| Advanced Electrical Innovations | Nicholas Berkley Ollila | — | (909) 286 1737 | Electricians | Ontario · San Bernardino County | — | — |
| Advanced Environmental Landscape | Richard Luis Lopez-blanco | — | (909) 994 5522 | Windows, patio, painters | Alta Loma · San Bernardino County | — | — |
| Advanced Glazing Concepts | Advanced Glazing Concepts | — | (760) 552 9718 | Windows, patio, painters | Yucca Valley · San Bernardino County | — | — |
| Advanced Green Restoration Enviromental Earth INC | Rudy Ray Benavidez | — | (714) 713 7668 | GC, remodel, ADU | Rancho Cucamonga · San Bernardino County | — | — |
| Advanced HVAC Solutions | Advanced HVAC Solutions | — | (909) 325 9885 | HVAC | Chino · San Bernardino County | — | — |
| Advanced Inverter Services INC | William Roger Katchmar | — | (909) 389 9444 | Electricians | Yucaipa · San Bernardino County | — | — |