| A C Dunlap General Contracting | Alexander Charles Dunlap | — | (909) 262 2200 | GC, remodel, ADU | Fontana · San Bernardino County | — | — |
| A C King INC | Federico Ornelas | — | (833) 231 7447 | HVAC | Rialto · San Bernardino County | — | — |
| A C P Plumbing Enterprises INC | Albert Cruz Perez | — | (951) 218 7197 | Other | Colton · San Bernardino County | — | — |
| A C Perfections INC | Keith Allen Kiss | — | (909) 466 0203 | HVAC | Alta Loma · San Bernardino County | — | — |
| A C Plus Heating & Air INC | Ronald Thomas Postoian | — | (760) 243 4440 | HVAC | Victorville · San Bernardino County | — | — |
| A C Prime Builders | A C Prime Builders | — | (909) 875 6058 | GC, remodel, ADU | Fontana · San Bernardino County | — | — |
| A C R Technologies | A C R Technologies | — | (951) 757 5483 | HVAC | Rancho Cucamonga · San Bernardino County | — | — |
| A C S Cabinets & Countertops | Gerardo Rubio Hernandez | — | (909) 518 2982 | GC, remodel, ADU | Victorville · San Bernardino County | — | — |
| A C S General Construction | Belmontes Adan Orozco | — | (951) 966 6510 | GC, remodel, ADU | Fontana · San Bernardino County | — | — |
| A C S Refrigeration | A C S Refrigeration | — | (760) 680 3045 | HVAC | Hesperia · San Bernardino County | — | — |
| A C Spraggins Engineering & Underground INC | Brett C Spraggins | — | (714) 995 7552 | Other | Ontario · San Bernardino County | — | — |
| A C T INC | Thomas Wayne Cronan | — | (909) 908 4311 | Other | Upland · San Bernardino County | — | — |
| A Class Floor & Tile | A Class Floor & Tile | — | (909) 800 2946 | Other | Big Bear Lake · San Bernardino County | — | — |
| A Craftsman Finishing Touch | A Craftsman Finishing Touch | — | (626) 590 7797 | GC, remodel, ADU | Rancho Cucamonga · San Bernardino County | — | — |
| A D L C | A D L C | — | (909) 244 9646 | Other | Alta Loma · San Bernardino County | — | — |
| A D V Electrical Services INC | Richard Steven Thomas | — | (760) 956 2407 | Electricians | Hesperia · San Bernardino County | — | — |
| A E C Moreno Corporation | Hector Miguel Moreno | — | (909) 705 8505 | GC, remodel, ADU | Colton · San Bernardino County | — | — |
| A E Construction | Estevez Alejandro | — | (714) 752 9018 | GC, remodel, ADU | Adelanto · San Bernardino County | — | — |
| A E Electric | Albert Charles Ethier | — | (951) 250 4545 | Electricians | Alta Loma · San Bernardino County | — | — |
| A G Engineering INC DBA Albert Gutierrez | Gutierrez Albert | — | (909) 944 8504 | Electricians | Rancho Cucamonga · San Bernardino County | — | — |
| A G G Construction | Arce Gonzalez Giovanni | — | (909) 609 5873 | GC, remodel, ADU | Lake Arrowhead · San Bernardino County | — | — |
| A G Heating & Air | A G Heating & Air | info@agheatingair.com | (714) 272 3173 | HVAC | Ontario · San Bernardino County | — | — |
| A G Painting | A G Painting | — | (760) 617 7498 | Windows, patio, painters | Adelanto · San Bernardino County | — | — |
| A General Coating | A General Coating | — | (909) 355 3420 | Windows, patio, painters | Fontana · San Bernardino County | — | — |
| A I H Flooring | A I H Flooring | — | (909) 376 4506 | Other | Upland · San Bernardino County | — | — |
| A I Painting | A I Painting | — | (951) 310 8000 | Windows, patio, painters | Hesperia · San Bernardino County | — | — |
| A J And E General Construction INC | Juan Jose Sanabria | — | (909) 205 5722 | GC, remodel, ADU | San Bernardino · San Bernardino County | — | — |
| A J Foulkes Electric | Arthur Joseph Foulkes | — | (909) 498 6890 | Electricians | Fontana · San Bernardino County | — | — |
| A J General Contractor | A J General Contractor | — | (714) 720 3988 | GC, remodel, ADU | Chino · San Bernardino County | — | — |
| A J Heating & Air Conditioning | Abel Jr Arinaga | — | (714) 474 3056 | HVAC | San Bernardino · San Bernardino County | — | — |
| A J Supreme Coatings | Adelaido Jr Rodriguez | — | (909) 501 8419 | Windows, patio, painters | Highland · San Bernardino County | — | — |
| A Janiszewski Company DBA Exclusive HVAC | Patrick Alexander Janiszewski | — | (760) 246 5221 | HVAC | Hesperia · San Bernardino County | — | — |
| A Kaplan Construction Co INC | Alan Bruce Kaplan | — | (909) 948 0255 | GC, remodel, ADU | Rancho Cucamonga · San Bernardino County | — | — |
| A L Construction | A L Construction | — | (951) 906-2362 | GC, remodel, ADU | San Bernardino · San Bernardino County | — | — |
| A L Landscaping And Maintenance | A L Landscaping And Maintenance | — | (909) 938 2092 | Windows, patio, painters | Highland · San Bernardino County | — | — |
| A Lopez & Sons INC | Armida Ruth Gallegos | — | (909) 621 6001 | Other | Chino · San Bernardino County | — | — |
| A Lopez Concrete | A Lopez Concrete | hello@rfuenzalida.com | (909) 831 5109 | Other | Yucaipa · San Bernardino County | — | — |
| A M C Framing Enterprises INC | Sean Adam Hale | — | (909) 389 1456 | GC, remodel, ADU | Yucaipa · San Bernardino County | — | — |
| A M Custom Painting INC | Martinez Antonio | — | (323) 718 4927 | Windows, patio, painters | Apple Valley · San Bernardino County | — | — |
| A M E Roofing | Dong Wook Seo | — | (909) 766 3200 | Other roofers | Upland · San Bernardino County | — | — |