| At Your Service Plumbing | Francisco Javier Cervantes | clientcare@atyourserviceplumbing.com | (253) 460-0826 | Other | Sonora · Tuolumne County | — | — |
| Awesome Heating And Air | Awesome Heating And Air | — | (209) 896 6526 | HVAC | Soulsbyville · Tuolumne County | — | — |
| Azteca Pools & Spa | Azteca Pools & Spa | garcia.edmundo@jahoo.com | (209) 591-9530 | Pool | Sonora · Tuolumne County | — | — |
| B E Construction | Erik Lee Witt | — | (209) 728 4442 | GC, remodel, ADU | Twain Harte · Tuolumne County | — | — |
| B J Slaton Trucking | B J Slaton Trucking | — | (209) 928 3132 | Other | Tuolumne · Tuolumne County | — | — |
| Balance Builder | Balance Builder | — | (347) 585 7947 | GC, remodel, ADU | Jamestown · Tuolumne County | — | — |
| Baldwin Construction | Jex Frank Iii Baldwin | — | (209) 770 3821 | Other | Sonora · Tuolumne County | — | — |
| Banks Glass Company | Jon Thomas Banks | — | (209) 984 4111 | Windows, patio, painters | Jamestown · Tuolumne County | — | — |
| Bar Ob Enterprises | Nolan Speer Brennan | — | (209) 661 6365 | Other | Sonora · Tuolumne County | — | — |
| Barry Dugan Electric INC DBA Barry Electric | Barry Ross Dugan | — | (209) 532 7710 | Electricians | Sonora · Tuolumne County | — | — |
| Bartels Building | Bartels Building | — | (209) 588 6449 | GC, remodel, ADU | Sonora · Tuolumne County | — | — |
| Battle Electric | Richard Zachariah Battle | — | (209) 352 2663 | Electricians | Chinese Camp · Tuolumne County | — | — |
| Baughn Electric LLC | William Joseph Baughn | — | (209) 743 9735 | Electricians | Sonora · Tuolumne County | — | — |
| Bay Area Homes INC | Steven David Guernsey | — | (510) 304 7959 | GC, remodel, ADU | Groveland · Tuolumne County | — | — |
| Bear's Path LLC | James Charles Ramsey | — | (209) 459 7490 | GC, remodel, ADU | Sonora · Tuolumne County | — | — |
| Bearden Enterprises Incorporated | Michael David Bearden | — | (209) 532 1700 | Other | Jamestown · Tuolumne County | — | — |
| Benchmark Building Co INC | Jacob Liam Stovall | — | (209) 206 6863 | GC, remodel, ADU | Soulsbyville · Tuolumne County | — | — |
| Berchtold Const | Berchtold Const | — | (209) 770 0232 | Other | Soulsbyville · Tuolumne County | — | — |
| Betz Electric | Erik Andrew Betzenderfer | betzelectric@gmail.com | (209) 840 3321 | Electricians | Sonora · Tuolumne County | — | — |
| Betzler Heating & Air Conditioning | Stephen James Betzler | — | (209) 588 8268 | HVAC | Tuolumne · Tuolumne County | — | — |
| Big Bear Roofing | William Francis Silva | — | (209) 532 1299 | Other roofers | Sonora · Tuolumne County | — | — |
| Big Pine General Engineering Contracting INC | Joseph Wallace Porter | — | (209) 694 5397 | Other | Sonora · Tuolumne County | — | — |
| Black Oak Casino Resort | Black Oak Casino Resort | — | (877) 747-8777 | Property managers | Tuolumne · Tuolumne County | — | — |
| Blott Quality Homes | Lynda Topping Blott | — | (209) 591 7249 | GC, remodel, ADU | Soulsbyville · Tuolumne County | — | — |
| Bob Ragan Construction | Robert Duane Ragan | — | (209) 613 4341 | GC, remodel, ADU | Columbia · Tuolumne County | — | — |
| Bob's Woodshed | Bob's Woodshed | — | (209) 768 6855 | GC, remodel, ADU | Sonora · Tuolumne County | — | — |
| Bonnie Kolpack | Bonnie Kolpack | — | (209) 743 5025 | Other | Sonora · Tuolumne County | — | — |
| Borgen Electric | Brian Steve Borgen | — | (408) 966 5267 | Electricians | Sonora · Tuolumne County | — | — |
| Bottini Building Services | Michael Kenneth Bottini | — | (925) 963 3458 | GC, remodel, ADU | Twain Harte · Tuolumne County | — | — |
| Boyer Construction | Robert Eugene Boyer | — | (209) 586 5010 | GC, remodel, ADU | Sonora · Tuolumne County | — | — |
| Braden Lay Painting | Braden Lay Painting | — | (209) 213 9013 | Windows, patio, painters | Mi Wuk Village · Tuolumne County | — | — |
| Bradford W Lorenzen DBA Lorenzen Construction | Bradford W Lorenzen | — | (209) 409 4233 | GC, remodel, ADU | Columbia · Tuolumne County | — | — |
| Brenden Simunaci/simunaci Construction | Brenden Alexander Simunaci | — | (209) 532 8718 | GC, remodel, ADU | Columbia · Tuolumne County | — | — |
| Brown-n-sons Construction | Richard Bryan Brown | — | (209) 206 2400 | GC, remodel, ADU | Groveland · Tuolumne County | — | — |
| Buck's Construction INC | Opie Buck Lemmon | — | (209) 770 5455 | GC, remodel, ADU | Sonora · Tuolumne County | — | — |
| Buds Heating & Air | Buds Heating & Air | — | (209) 857 0438 | HVAC | Sonora · Tuolumne County | — | — |
| Bulldog Brushing | Scott Sterling Hammond | — | (209) 768 6181 | Other | Sonora · Tuolumne County | — | — |
| Bullfrog Construction | Jeremiah Lee Jones | — | (209) 996 7232 | GC, remodel, ADU | Sonora · Tuolumne County | — | — |
| Burns Lionel Clinton Jr | Burns Lionel Clinton Jr | — | (707) 931 8912 | GC, remodel, ADU | Chinese Camp · Tuolumne County | — | — |
| Burns Refuse Services | Burns Refuse Services | — | (209) 928-4251 | Property managers | Tuolumne · Tuolumne County | — | — |