| Banuelos Enterprises | Francisco Javier Banuelos | — | (951) 757 2456 | GC, remodel, ADU | Temecula · Riverside County | — | — |
| Bany Plumbing Engineering | Bany N Chiroy | — | (213) 858 1202 | Other | Riverside · Riverside County | — | — |
| Banzai Electric | Brian Thomas Schildmeyer | — | (760) 343 6057 | Electricians | Palm Desert · Riverside County | — | — |
| Barajas Electric | Barajas Johnny | — | (562) 587 5643 | Electricians | Menifee · Riverside County | — | — |
| Barajas Paving LLC | Ramon Doroteo Barajas Rodriguez | — | (951) 801 8001 | Other | Moreno Valley · Riverside County | — | — |
| Barba Electrical Security Solutions | Jose Ruben Barba | — | (951) 288 0506 | Electricians | Eastvale · Riverside County | — | — |
| Barba Electrical Security Solutions INC | Jose Ruben Barba | — | (951) 312 5447 | Electricians | Eastvale · Riverside County | — | — |
| Barbee's Welding | Barbee's Welding | — | (909) 240 7600 | Other | Wildomar · Riverside County | — | — |
| Barber Enterprise | Barber Enterprise | — | (909) 268 6719 | Other | Hemet · Riverside County | — | — |
| Barbosa General Construction | Barbosa Ronaldo | — | (626) 260 2248 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Barin Electrical | Ronald Barin Chaharbakhsh | — | (818) 585 6123 | Electricians | Lake Elsinore · Riverside County | — | — |
| Barlow Engineering | James Douglas Barlow | — | (951) 746 3133 | Other | Menifee · Riverside County | — | — |
| Barnes Construction INC | Buck Eugene Barnes | — | (951) 805 8192 | GC, remodel, ADU | Hemet · Riverside County | — | — |
| Barnes Electric | Barnes Rodney | — | (562) 833 5372 | Electricians | Corona · Riverside County | — | — |
| Barnett's A/c | Barnett's A/c | — | (760) 391 0350 | HVAC | La Quinta · Riverside County | — | — |
| Barney Electric | Tad Jay Barney | — | (949) 355 4678 | Electricians | Corona · Riverside County | — | — |
| Barnez Construction | Anthony Douglas Barnes | — | (951) 334 2060 | GC, remodel, ADU | Beaumont · Riverside County | — | — |
| Baron's Air Conditioning | Baron's Air Conditioning | — | (951) 741 1998 | HVAC | Moreno Valley · Riverside County | — | — |
| Barona Construction Cleaning INC | Erik Barona | — | (714) 328 2015 | Other | Riverside · Riverside County | — | — |
| Barone Construction | Anthony Marcus Jr Barone | — | (760) 275 3656 | GC, remodel, ADU | Palm Desert · Riverside County | — | — |
| Barr Door INC | Keith Stanley Rosenberger | — | (909) 825 8910 | Other | Riverside · Riverside County | — | — |
| Barranca Landscape | Barranca Landscape | office@barrancalandscape.com | (714) 772 0099 | Windows, patio, painters | Riverside · Riverside County | — | — |
| Barrera Tile Service | Jesus L Barrera | — | (951) 530 2789 | Other | Jurupa Valley · Riverside County | — | — |
| Barrett Bros Masonry INC | Pedro Alberto Barreto Cazarez | — | (951) 230 2554 | Other | Beaumont · Riverside County | — | — |
| Barrett David Hoffman | Barrett David Hoffman | — | (760) 485 1203 | Other | Indio Hills · Riverside County | — | — |
| Barrios Painting Company | Barrios Efrain | barriospainting@yahoo.com | (415) 424-2470 | Windows, patio, painters | Lake Elsinore · Riverside County | — | — |
| Barry Pierce - Gen Contractor | Barry Pierce - Gen Contractor | — | (951) 581 6008 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Barry's Security Services INC | Barry's Security Services INC | — | (951) 789-7575 | Alarm and generators | Riverside · Riverside County | — | — |
| Bart Bastiaans DBA Alamo Fence | Bart Bastiaans DBA Alamo Fence | — | (951) 312 4597 | Other | Riverside · Riverside County | — | — |
| Barth Builders INC | Edward Paul Barth | barthbuilders@barth-builders.com | (951) 830 3969 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Barton R Gross Tile And Stone | Barton Ralph Gross | — | (951) 781 0356 | Other | Riverside · Riverside County | — | — |
| Bartram Construction | Michael James Bartram | — | (442) 274 2619 | GC, remodel, ADU | Palm Desert · Riverside County | — | — |
| Baruc Ramos | Baruc Ramos | — | (951) 807 4759 | GC, remodel, ADU | Murrieta · Riverside County | — | — |
| Bas Plumbing INC | Thomas Phillip Iii Barker | — | (909) 260 9877 | Other | Riverside · Riverside County | — | — |
| Base Plumbing INC | Benjamin Carlos Hernandez | — | (951) 446 7144 | Other | Moreno Valley · Riverside County | — | — |
| Baseband Telecom Corporation | David Hubert Reynolds | — | (951) 493 6780 | Electricians | Corona · Riverside County | — | — |
| Baseco Enterprises INC | Christopher Alan Lewin | — | (951) 245 5527 | Other | Lake Elsinore · Riverside County | — | — |
| Bash Electric | Trevor Allen Bash | — | (760) 450 4254 | Electricians | Temecula · Riverside County | — | — |
| Basilio's Plumbing | Basilio's Plumbing | — | (760) 907 5694 | Other | Coachella · Riverside County | — | — |
| Bassett Building | Bassett Building | — | (951) 821 1234 | GC, remodel, ADU | Canyon Lake · Riverside County | — | — |