| Big City Signs INC | Paul Louis Borne | — | (951) 696 9390 | Other | Murrieta · Riverside County | — | — |
| Big Dog Fence | Big Dog Fence | — | (909) 496 2199 | Other | Corona · Riverside County | — | — |
| Big J's Air Conditioning And Heating | Joel Agregado Ramoran | — | (760) 285 3649 | HVAC | Palm Springs · Riverside County | — | — |
| Big Jay's Flooring | Gary Allen Green | — | (951) 538 6506 | Other | Sun City · Riverside County | — | — |
| Big John's Plumbing INC | John Oliver Hernandez | — | (951) 934 3931 | Other | Riverside · Riverside County | — | — |
| Big League Concrete Services | Cesar Delgado | — | (951) 418 1796 | GC, remodel, ADU | Perris · Riverside County | — | — |
| Big Or Small Construction | Abel Edward Celiceo | — | (619) 254 9357 | GC, remodel, ADU | Winchester · Riverside County | — | — |
| Big Orange Plumbing INC | Nathan Francisco Quihuis | — | (951) 200 4820 | Other | Menifee · Riverside County | — | — |
| Big Pipes Plumbing | Big Pipes Plumbing | — | (951) 550 6309 | Other | Menifee · Riverside County | — | — |
| Big Sky Gate Keeper | Big Sky Gate Keeper | — | (760) 346 9090 | Electricians | La Quinta · Riverside County | — | — |
| Big Tree Home Improvement | Big Tree Home Improvement | — | (951) 847 0544 | GC, remodel, ADU | Corona · Riverside County | — | — |
| Big Wood Builders INC | David Allen Wood | — | (818) 822 0575 | GC, remodel, ADU | Palm Desert · Riverside County | — | — |
| Bigfogg INC | Chris Paul Miehl | — | (951) 587 2460 | Other | Murrieta · Riverside County | — | — |
| Bigfoot Roofing | Yopoldo Ernesto Rodriguez | — | (951) 401 7392 | Other roofers | Murrieta · Riverside County | — | — |
| Bighorn Glass Company LLC | Duran Jeffrey Pierce | — | (760) 808 8123 | Windows, patio, painters | Cathedral City · Riverside County | — | — |
| Bighorn Grading & Engineering INC | Daniel Martin Noel | — | (951) 694 6330 | Other | Murrieta · Riverside County | — | — |
| Bigpond Enterprises INC | Jack Eugene Ii Bigpond | — | (951) 440 5806 | Pool | Murrieta · Riverside County | — | — |
| Bill & Dave's Landscape Maintenance INC | David Anthony Leidenfrost | — | (951) 943 6455 | Windows, patio, painters | Winchester · Riverside County | — | — |
| Bill Bruce | Bill Bruce | — | (909) 810 6027 | GC, remodel, ADU | Beaumont · Riverside County | — | — |
| Bill Carpenter Const INC | William Wesley Jr Carpenter | — | (951) 927 0449 | Other | San Jacinto · Riverside County | — | — |
| Bill Contreras Doors And Finish | Bill Contreras Doors And Finish | — | (760) 238 0443 | Other | Bermuda Dunes · Riverside County | — | — |
| Bill Hagen Const Co | William Donald Jr Hagen | — | (760) 310 1897 | GC, remodel, ADU | Temecula · Riverside County | — | — |
| Bill Weick Drywall | Bill Weick Drywall | — | (951) 375 1278 | Other | Wildomar · Riverside County | — | — |
| Bill West | Bill West | bill@billwest.com | (951) 371 9657 | GC, remodel, ADU | Corona · Riverside County | — | — |
| Bill Williams Construction INC | Billy Lee Williams | — | (951) 279 2234 | GC, remodel, ADU | Corona · Riverside County | — | — |
| Bill's Electrical Service | William John Dilly | — | (909) 524 9355 | Electricians | Desert Hot Springs · Riverside County | — | — |
| Bill's Hydroseed | Bill's Hydroseed | — | (951) 734 6245 | Other | Corona · Riverside County | — | — |
| Bill's Locksmith Shop INC | Charles John Caballero | — | (951) 925 0905 | Other | Hemet · Riverside County | — | — |
| Billion Air INC | Mark Davis Julian | — | (951) 401 4019 | HVAC | Murrieta · Riverside County | — | — |
| Billo Mobile Home Specialist | Pablo Jr Garcia | — | (951) 445 6187 | Other | Winchester · Riverside County | — | — |
| Billy J Nickel DBA B J N Plumbing Contractors | Billy Joe Nickel | — | (714) 998 6700 | GC, remodel, ADU | Corona · Riverside County | — | — |
| Billy Jo Able Montoya Construction | Billy Joe Montoya | — | (626) 488 6211 | GC, remodel, ADU | Murrieta · Riverside County | — | — |
| Billy Joe Lee | Billy Joe Lee | — | (760) 408 8387 | GC, remodel, ADU | Murrieta · Riverside County | — | — |
| Bin Chen | Bin Chen | — | (909) 694 8773 | GC, remodel, ADU | Eastvale · Riverside County | — | — |
| Binnie Masonry | Binnie Masonry | — | (760) 528 5685 | Other | Canyon Lake · Riverside County | — | — |
| Biondi Painting INC | Glen Joseph Biondi | — | (951) 309 8030 | Windows, patio, painters | Canyon Lake · Riverside County | — | — |
| Biondi Renovations INC | Gregory Phillip Biondi | — | (951) 821 0687 | GC, remodel, ADU | Canyon Lake · Riverside County | — | — |
| Biota Landcare INC | Erik Ocdulio Pineda Aldana | — | (442) 307 1074 | Windows, patio, painters | Desert Hot Springs · Riverside County | — | — |
| Birchard Plumbing | Birchard Plumbing | — | (951) 746 8262 | Other | Lake Elsinore · Riverside County | — | — |
| Birdie A C And Heating | Birdie A C And Heating | — | (760) 275 1624 | HVAC | La Quinta · Riverside County | — | — |