| Affordable Technology INC | James Timothy Needham | — | (951) 374 1551 | Electricians | San Bernardino · San Bernardino County | — | — |
| Affordable Window Replacements | Affordable Window Replacements | — | (562) 505 6044 | Windows, patio, painters | Victorville · San Bernardino County | — | — |
| Afg Trinity Construction | Guadarrama Gerardo Haro | — | (760) 601 6608 | GC, remodel, ADU | San Bernardino · San Bernardino County | — | — |
| Afm HVAC | Afm HVAC | — | (951) 205 5179 | HVAC | Rancho Cucamonga · San Bernardino County | — | — |
| Afr General Contractors | Soto Ricardo Moreno | — | (909) 802 0367 | GC, remodel, ADU | Apple Valley · San Bernardino County | — | — |
| After Hours Refrigeration INC | Larry Sterling Smith | — | (909) 754 8506 | HVAC | Crestline · San Bernardino County | — | — |
| Afterair INC | Mitchell John Medina | — | (310) 963 7053 | HVAC | Upland · San Bernardino County | — | — |
| Afuang Audio Visual & Low Voltage System | Josiah Ben Contemplo Javier | — | (714) 797 0278 | Other | Chino Hills · San Bernardino County | — | — |
| Ag Building And Remodeling INC | Andy Gonzales | — | (909) 527 5575 | GC, remodel, ADU | Ontario · San Bernardino County | — | — |
| Ag Tree Company | Gonzalez Andrew | agtreewa@gmail.com | (909) 739 5647 | Other | Rancho Cucamonga · San Bernardino County | — | — |
| Agape Sight N' Sound | Agape Sight N' Sound | — | (909) 627 6818 | Other | Chino · San Bernardino County | — | — |
| Agarci Home Improvement INC | Victor Alejandro Garcia Celis | — | (909) 649 4010 | GC, remodel, ADU | Big Bear City · San Bernardino County | — | — |
| Agc Construction Co | Qais Habahbeh | — | (949) 400 1585 | GC, remodel, ADU | Rancho Cucamonga · San Bernardino County | — | — |
| Agility Air Heating And Air Conditioning | Guillermo Jr Ortiz | — | (909) 471 1347 | HVAC | Rialto · San Bernardino County | — | — |
| Agility Integration Corporation | Brian Arthur Bush | — | (909) 947 5753 | Electricians | Ontario · San Bernardino County | — | — |
| Ags Construction & Restoration | Alfredo Garcia | — | (909) 379 8959 | GC, remodel, ADU | Rialto · San Bernardino County | — | — |
| Ags Pros INC | Luanchong He | — | (909) 689 7261 | Other | Rancho Cucamonga · San Bernardino County | — | — |
| Agua Azul Pools | Agua Azul Pools | — | (909) 329 8668 | Pool | Redlands · San Bernardino County | — | — |
| Aguilar Modular | Aguilar Modular | — | (909) 994 5535 | GC, remodel, ADU | Colton · San Bernardino County | — | — |
| Aguilar Tree Service LLC | Celis Rene Aguilar | — | (714) 769 0602 | Other | Ontario · San Bernardino County | — | — |
| Aguilar's Affordable Roofing INC | Aguilar Farfan Noe | — | (562) 922 3594 | Other roofers | Rialto · San Bernardino County | — | — |
| Aguilera Demolition | David Aguilera | — | (909) 219 3314 | Other | Colton · San Bernardino County | — | — |
| Aguirre Electric Service | Ruben Joe Sr Aguirre | — | (909) 921 4962 | Electricians | Upland · San Bernardino County | — | — |
| Aguirre Painting INC | Maria Guadalupe Aguirre | aguirrepainting11@yahoo.com | (909) 238 0561 | Windows, patio, painters | Chino Hills · San Bernardino County | — | — |
| Aguirre's General Construction | Aguirre Amador Alexi | — | (323) 336 7411 | GC, remodel, ADU | Pinon Hills · San Bernardino County | — | — |
| Ahmed Alkhateeb | Ahmed Alkhateeb | — | (760) 680 8288 | GC, remodel, ADU | Hesperia · San Bernardino County | — | — |
| Ahome Construction INC | Qiang Zhou | — | (626) 898 2715 | GC, remodel, ADU | Ontario · San Bernardino County | — | — |
| Ai- Electric | Gary Gabrial Hernandez | — | (951) 544 0399 | Electricians | Grand Terrace · San Bernardino County | — | — |
| Aics | A I C S | — | (760) 265 9405 | Other | Apple Valley · San Bernardino County | — | — |
| Aid Tree Care Corp | Ariana R Perez | — | (909) 381 0469 | Tree | Rialto · San Bernardino County | — | — |
| Aie | Joseph Allen Sturgeon | — | (951) 219 8438 | GC, remodel, ADU | Crestline · San Bernardino County | — | — |
| Air Bee HVAC | Yu Niu | — | (626) 624 3030 | HVAC | Ontario · San Bernardino County | — | — |
| Air Boss Mechanical INC | Robert Andre Fiorini | — | (909) 949 8117 | HVAC | Upland · San Bernardino County | — | — |
| Air Conditioning & Heating Service Master | Christopher Charles Lopez | — | (909) 664 3940 | HVAC | Rancho Cucamonga · San Bernardino County | — | — |
| Air Conditioning And HVAC Solutions San Bernardino | Air Conditioning And HVAC Solutions San Bernardino | — | (840) 249-0977 | HVAC | San Bernardino · San Bernardino County | — | — |
| Air Conditioning Engineering INC | Ray Vincent Brown | — | (909) 483 0816 | HVAC | Rancho Cucamonga · San Bernardino County | — | — |
| Air Control Specialties INC | David Anthony Nunes | — | (909) 947 0535 | HVAC | Ontario · San Bernardino County | — | — |
| Air Control Systems INC | Phillip David Leotaud | — | (909) 786 4230 | HVAC | Ontario · San Bernardino County | — | — |
| Air Controlled Environments | William Devereaux Ro Farnell | — | (909) 945 0055 | HVAC | Rancho Cucamonga · San Bernardino County | — | — |
| Air Dyne Mechanical | Air Dyne Mechanical | — | (909) 948 1177 | HVAC | Rancho Cucamonga · San Bernardino County | — | — |