| Ayers Construction INC | Christopher Lee Ayers | — | (909) 899 1407 | Other | Rancho Cucamonga · San Bernardino County | — | — |
| Ayres Landscape Services INC | Bruce Armand Ayres | — | (909) 376 3330 | Windows, patio, painters | Chino · San Bernardino County | — | — |
| Ays Plumbing & Rooter Corp | Ays Plumbing & Rooter Corp | aysplumbingrooter@gmail.com | (909) 243 2086 | Other | Upland · San Bernardino County | — | — |
| Azevedo Construction | Richard Dwayne Azevedo | — | (909) 649 2681 | GC, remodel, ADU | Big Bear Lake · San Bernardino County | — | — |
| Azienda Builders INC | Rogelio Palacios | — | (760) 980 1363 | GC, remodel, ADU | Adelanto · San Bernardino County | — | — |
| Azlan Construction LLC | Manuel Victor Morones | — | (818) 262 9524 | GC, remodel, ADU | Montclair · San Bernardino County | — | — |
| Azrocs Construction | Sepheren Ferdinand Scorza | — | (323) 845 5050 | GC, remodel, ADU | San Bernardino · San Bernardino County | — | — |
| Aztec Casework Millwork | Aztec Casework Millwork | — | (951) 756 6954 | Other | San Bernardino · San Bernardino County | — | — |
| Azusa Construction INC | Daniel Yunlong Sun | — | (626) 290 2188 | GC, remodel, ADU | Chino Hills · San Bernardino County | — | — |
| B & B Electric Incorporated | Gary James Ross | — | (909) 241 8971 | Electricians | Chino · San Bernardino County | — | — |
| B & D Construction Co INC | Courtney Gratz | — | (909) 949 0360 | Other | Upland · San Bernardino County | — | — |
| B & L Backhoe Service | Schmel William | — | (760) 559 7155 | Other | Hesperia · San Bernardino County | — | — |
| B & M Painting Contractors INC | Grace Marie Ables | — | (760) 310 5667 | Windows, patio, painters | Twentynine Palms · San Bernardino County | — | — |
| B & M Roofing Stripping Services | Mark Anthony Carrasco | — | (909) 802 6925 | Other roofers | Ontario · San Bernardino County | — | — |
| B & P Electrical Corp | Robert Morgutia | — | (760) 686 7251 | Electricians | Victorville · San Bernardino County | — | — |
| B & R Finish INC | Brandon James Devalentino | — | (760) 220 6348 | Other | Apple Valley · San Bernardino County | — | — |
| B & Z Electric INC | Julio Cesar Castillo | — | (818) 568 7809 | Electricians | Upland · San Bernardino County | — | — |
| B - G Stair Designs | B - G Stair Designs | — | (951) 202 1374 | Other | Rancho Cucamonga · San Bernardino County | — | — |
| B A S Engineering INC | Ajesh Sanmukh Bhakta | — | (909) 484 2575 | Other | Rancho Cucamonga · San Bernardino County | — | — |
| B A True Gardens Landscape | B A True Gardens Landscape | — | (213) 327 8696 | Windows, patio, painters | Victorville · San Bernardino County | — | — |
| B And N Heating And Air | Brandon David Wysocki | — | (909) 680 9018 | HVAC | Montclair · San Bernardino County | — | — |
| B Andres Glass | B Andres Glass | — | (909) 204 0787 | Windows, patio, painters | Rancho Cucamonga · San Bernardino County | — | — |
| B B's Painting | B B's Painting | — | (909) 585 9889 | Windows, patio, painters | Big Bear City · San Bernardino County | — | — |
| B C Concrete Cutting | B C Concrete Cutting | bcconcretecutting@gmail.com | (909) 629 8542 | Other | Hesperia · San Bernardino County | — | — |
| B Connected INC | Michael Hanna | info@b-connected.com | (800) 318 9228 | Electricians | Upland · San Bernardino County | — | — |
| B D Plumbing | B D Plumbing | — | (909) 851 4454 | Other | Big Bear Lake · San Bernardino County | — | — |
| B E B Wallcovering INC | Lucy Ann Bender | — | (909) 463 4222 | Windows, patio, painters | Rancho Cucamonga · San Bernardino County | — | — |
| B Fries Construction INC | Charles Buchanan Fries | — | (909) 930 2848 | GC, remodel, ADU | Ontario · San Bernardino County | — | — |
| B G's Plumbing And Rooter | B G's Plumbing And Rooter | — | (909) 688 6486 | HVAC | San Bernardino · San Bernardino County | — | — |
| B H AC & Mechanical Corp | Rene Angel Ramirez | — | (909) 248 8212 | HVAC | Chino · San Bernardino County | — | — |
| B H G Construction INC | Benito Hugo Gonzalez-Ugalde | — | (626) 367 1908 | GC, remodel, ADU | Upland · San Bernardino County | — | — |
| B H Murphy General Contractor INC | Thomas James Murphy | — | (760) 244 6311 | GC, remodel, ADU | Oak Hills · San Bernardino County | — | — |
| B I G General Contractors INC | Vincent Alexander Linares | — | (616) 464 4940 | GC, remodel, ADU | Fontana · San Bernardino County | — | — |
| B J M Construction | Jeannie Louise Mitchell | — | (760) 617 2858 | GC, remodel, ADU | Victorville · San Bernardino County | — | — |
| B J's Electrical + | Brian Alan Jones | — | (909) 518 1566 | Electricians | Rancho Cucamonga · San Bernardino County | — | — |
| B J's Glass & Mirror | B J's Glass & Mirror | — | (909) 888 3287 | Windows, patio, painters | San Bernardino · San Bernardino County | — | — |
| B K S Electric | Bradley Kent Smith | — | (760) 220 0684 | Electricians | Hesperia · San Bernardino County | — | — |
| B K Top Construction INC | Kim Bum Suk | — | (909) 767 8576 | GC, remodel, ADU | Montclair · San Bernardino County | — | — |
| B M J Landscaping | B M J Landscaping | bmjlandscapinginc1@bmjlandscaping.com | (909) 528 2270 | Windows, patio, painters | Yucaipa · San Bernardino County | — | — |
| B M L Quality Construction INC | Ernesto Alberto Beltran | — | (909) 559 6797 | GC, remodel, ADU | Fontana · San Bernardino County | — | — |