| A V Metal Fabrication | A V Metal Fabrication | — | (951) 385 5133 | Other | San Bernardino · San Bernardino County | — | — |
| A W E & Associates INC | Paul Arthur Walker | — | (760) 900 8560 | GC, remodel, ADU | Lucerne Valley · San Bernardino County | — | — |
| A W S Electric | Henry Walter Iii Schobel | — | (951) 317 6999 | Electricians | Yucaipa · San Bernardino County | — | — |
| A Y S Construction | Jose Alfredo Rodriguez-Ramirez | — | (760) 559 2927 | GC, remodel, ADU | Victorville · San Bernardino County | — | — |
| A&a Insulation General Partnership | Alejandro Olazaba-Gomez | — | (760) 628 9302 | Other | Victorville · San Bernardino County | — | — |
| A&a Plastering INC | Torres Art Jacobo | — | (714) 788 9105 | Other | Hesperia · San Bernardino County | — | — |
| A&b Plastering INC | Melbin Etiel Arita Madrid | — | (909) 485 9727 | Other | Apple Valley · San Bernardino County | — | — |
| A&d Landscape Services INC | Ivan Daniel Banuelos Martinez | — | (909) 845 1898 | Windows, patio, painters | San Bernardino · San Bernardino County | — | — |
| A&f Ramirez Construction INC | Felipe De Jesus Ramirez Palomino | felipe@aframirezconstruction.com | (909) 276 9936 | GC, remodel, ADU | Upland · San Bernardino County | — | — |
| A&g Tile Pros LLC | Adolfo Guerrero | contact@agtilepros.com | (626) 255 8072 | Other | Fontana · San Bernardino County | — | — |
| A&h De La Torre Construction INC | La Torre Armando De | — | (909) 784 7654 | GC, remodel, ADU | Rialto · San Bernardino County | — | — |
| A&j Roofing INC | Reyes Benito Jimenez | — | (714) 925 5056 | Other roofers | Colton · San Bernardino County | — | — |
| A&l Systems LLC | Hector Garcia | — | (877) 912 7483 | Electricians | Ontario · San Bernardino County | — | — |
| A&n Landscaping INC | Noe Ramos | — | (909) 658 4255 | Windows, patio, painters | Highland · San Bernardino County | — | — |
| A&s Construction INC | Steven Jacob Stoker | — | (909) 239 1968 | Other | Chino · San Bernardino County | — | — |
| A&s Structural Steel INC | Alejandro Jr Gutierrez | — | (909) 775 2461 | Other | Phelan · San Bernardino County | — | — |
| A's 1 Roofing | Ricardo Gonzalez | — | (951) 783 7189 | Other roofers | Redlands · San Bernardino County | — | — |
| A's Heating & Air Services INC | Sevilla Axel | — | (626) 437 1998 | HVAC | Chino · San Bernardino County | — | — |
| A's Plumbing And Drain Cleaning | A's Plumbing And Drain Cleaning | — | (626) 672 5415 | Other | San Bernardino · San Bernardino County | — | — |
| A+ Electric Services INC | Enrique Jr Lopez | — | (310) 850 8151 | Electricians | Upland · San Bernardino County | — | — |
| A+ Home Services | A+ Home Services | — | (323) 620-5763 | Inspectors | San Bernardino · San Bernardino County | — | — |
| A-1 Andor Welding | Rogelio Lopez | — | (714) 337 1160 | Other | Hesperia · San Bernardino County | — | — |
| A-1 Delivery Co | Michael Terry Webb | — | (909) 444 1220 | Other | Ontario · San Bernardino County | — | — |
| A-1 Electrical | Ramon Jr Pando | — | (323) 221 0321 | Electricians | Upland · San Bernardino County | — | — |
| A-1 Smooth & Stucco INC | Hector Javier Salazar | — | (317) 345 2708 | Other | Highland · San Bernardino County | — | — |
| A-1 Tree Service | Joseph Eugene Rogers | — | (760) 983 1933 | Tree | Hesperia · San Bernardino County | — | — |
| A-genius HVAC INC | Hector Reggie Bonilla | — | (951) 250 5006 | HVAC | Rialto · San Bernardino County | — | — |
| A-quality Construction Company | Lana Mae Donnelly | — | (909) 565 6007 | GC, remodel, ADU | Pinon Hills · San Bernardino County | — | — |
| A-r Incorporated | David Israel Aldama Roman | — | (909) 600 4251 | HVAC | Running Springs · San Bernardino County | — | — |
| A-team Remodeling | Deborah Lisseth Gutierrez | — | (909) 277 5199 | GC, remodel, ADU | Grand Terrace · San Bernardino County | — | — |
| A. Upland Fire Protection INC | Eduardo Jeff | — | (909) 630 2660 | Electricians | Rancho Cucamonga · San Bernardino County | — | — |
| A.j.p Roofing | Becerra Alejandro Perez | — | (909) 747 2259 | Other roofers | Upland · San Bernardino County | — | — |
| A.z.g Construction INC | Gonzalez Alejandro Zaragoza | — | (562) 287 3293 | GC, remodel, ADU | Hesperia · San Bernardino County | — | — |
| A/c & Heat Services INC | Pete Charles Villasenor | — | (909) 566 4241 | HVAC | Fontana · San Bernardino County | — | — |
| A/c Man | A/c Man | — | (951) 284 9349 | HVAC | San Bernardino · San Bernardino County | — | — |
| A1 Construction | Beltran Alex | info@a1construction.com | (800) 220 0209 | GC, remodel, ADU | San Bernardino · San Bernardino County | — | — |
| A1 Earthworks | A1 Earthworks | — | (760) 596 9312 | Other | Pinon Hills · San Bernardino County | — | — |
| A1 Industrial Maintenance | Scott Paul Jr Etter | — | (760) 927 2786 | Other | Lucerne Valley · San Bernardino County | — | — |
| A1 Pro Painting Corp | Sergio Florez | — | (951) 507 9382 | Windows, patio, painters | Fontana · San Bernardino County | — | — |
| A1 Property Preservation LLC | John James Venner | — | (951) 321 0319 | GC, remodel, ADU | Highland · San Bernardino County | — | — |