| Best Plumbing Services | Jason Jay Best | — | (951) 788 1321 | Other | Riverside · Riverside County | — | — |
| Best Price Plumbers | Best Price Plumbers | — | (760) 272 5212 | Other | Palm Springs · Riverside County | — | — |
| Best Price Plumbers INC | Gregg David Nadeau | — | (760) 272 5212 | Other | Palm Springs · Riverside County | — | — |
| Best Quality Remodeling | Abraham Javier Zamora | — | (951) 850 4880 | GC, remodel, ADU | Beaumont · Riverside County | — | — |
| Best Rack | Best Rack | — | (949) 285 6101 | Other | Palm Desert · Riverside County | — | — |
| Best Reglaze INC | Castaneda Abelardo Rodriguez | — | (951) 230 1115 | Other | Moreno Valley · Riverside County | — | — |
| Best Signs INC | Jim Robert Cross | admin@bestsigns.com | (760) 320 3042 | Electricians | Palm Springs · Riverside County | — | — |
| Best Solutions Roofing LLC | Navarro Jorge Aguilar | — | (760) 469 0745 | Other roofers | Indio · Riverside County | — | — |
| Best Tech Heating & Cooling | Best Tech Heating & Cooling | — | (951) 391 8509 | HVAC | Beaumont · Riverside County | — | — |
| Best Tennis Maintenance INC | Mario Armando Navarrete | — | (760) 702 2590 | Windows, patio, painters | Coachella · Riverside County | — | — |
| Best Tile & Marble | Best Tile & Marble | — | (714) 401 0037 | Other | Riverside · Riverside County | — | — |
| Best Value Air Conditioning And Heating | Edward Watson Lynn | — | (951) 694 5728 | HVAC | Temecula · Riverside County | — | — |
| Best Value Garage Doors | Best Value Garage Doors | — | (714) 590 0000 | Other | Riverside · Riverside County | — | — |
| Bestclass Energy INC | Andy Medina Padilla | — | (951) 956 7077 | Electricians | San Jacinto · Riverside County | — | — |
| Bestway Concrete | Bestway Concrete | — | (951) 255 1203 | Other | Moreno Valley · Riverside County | — | — |
| Beterbuilt | Nolasco Javier | — | (714) 335 8934 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Beto's Construction | Salvador Alberto Carrillo Lay | — | (951) 750 4579 | GC, remodel, ADU | Perris · Riverside County | — | — |
| Beto's Creative Painting | Beto's Creative Painting | — | (951) 265 6493 | Windows, patio, painters | Wildomar · Riverside County | — | — |
| Better Bath | Niko Alfredo Zavala | leads@betterbath.com | (951) 338 4440 | GC, remodel, ADU | Temecula · Riverside County | — | — |
| Better Blue Construction | Jose Luis Rodriguez Jimenez | — | (951) 609 7371 | GC, remodel, ADU | Winchester · Riverside County | — | — |
| Better Days Construction LLC | Gustavo Marquez | — | (714) 661 8497 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Better Energy Solutions | Better Energy Solutions | — | (760) 552 0016 | Electricians | Hemet · Riverside County | — | — |
| Better Living Heating And Air Conditioning | Jordan Alexander Pierce | — | (951) 490 3196 | HVAC | Murrieta · Riverside County | — | — |
| Better View Windows | Better View Windows | — | (951) 322 0299 | Windows, patio, painters | Wildomar · Riverside County | — | — |
| Beverson Electric | Matthew Paul Beverson | — | (951) 419 7681 | Electricians | Moreno Valley · Riverside County | — | — |
| Bevilles Air Conditioning And Heating Corporation | Larry Beville | — | (951) 924 7465 | HVAC | Moreno Valley · Riverside County | — | — |
| Bex Builders | Bex Builders | — | (760) 851 4420 | GC, remodel, ADU | La Quinta · Riverside County | — | — |
| Beyond Custom Cabinets INC | Jose Antonio Garcia Vega | — | (951) 545 6477 | Other | Corona · Riverside County | — | — |
| Bfc Clark Contracting | Bruce Fraser Clark | — | (760) 408 3827 | GC, remodel, ADU | Palm Springs · Riverside County | — | — |
| Bg Construction | Ramon Acereto | — | (909) 809 8570 | GC, remodel, ADU | Cherry Valley · Riverside County | — | — |
| Bg Home Enterprises INC | William Christian Iii Grube | — | (951) 238 5155 | GC, remodel, ADU | San Jacinto · Riverside County | — | — |
| Bhelectric INC | Brian Keith Helton | — | (951) 407 9101 | Electricians | Corona · Riverside County | — | — |
| Bhowerton Holdings INC | Brandin Taylor Howerton | — | (951) 500 3648 | Other | Hemet · Riverside County | — | — |
| Bi Construction INC | Esquivel Benny Ivarra | — | (951) 522 5092 | GC, remodel, ADU | Moreno Valley · Riverside County | — | — |
| Bi-cen Steel Co | Louie Cabrera Jr Bailon | — | (818) 294 2419 | Other | Winchester · Riverside County | — | — |
| Bianco Blinds | Bianco Blinds | — | (909) 801 0566 | Other | Calimesa · Riverside County | — | — |
| Bibiano's Painting INC | Miguel Angel Bibiano-Bautista | — | (619) 513 5645 | Windows, patio, painters | Murrieta · Riverside County | — | — |
| Bienek Roofing - Construction INC | Michael Richard Morris | — | (800) 499 1340 | Other roofers | Indio · Riverside County | — | — |
| Big B's | Brandon Charles Mageno | — | (951) 719 4507 | HVAC | Murrieta · Riverside County | — | — |
| Big Ben Electric | Hurtado Benjamin | — | (951) 283 6706 | Electricians | Corona · Riverside County | — | — |