| Anderson Construction | William Russelle Anderson | — | (209) 304 9247 | GC, remodel, ADU | West Point · Calaveras County | — | — |
| Anderson Construction | Guy Allen Anderson | — | (209) 293 3399 | GC, remodel, ADU | West Point · Calaveras County | — | — |
| Andy Nelson Construction | Carl Andrew Nelson | — | (209) 768 5529 | GC, remodel, ADU | Arnold · Calaveras County | — | — |
| Angel Roofing INC | Juan Jose Angel Zepeda | — | (209) 479 6005 | Other roofers | Angels Camp · Calaveras County | — | — |
| Angels Electric | Scott Anthony Selke | — | (209) 768 9338 | Electricians | Murphys · Calaveras County | — | — |
| Angels Sewer & Drain INC | Jeff Ray Johnson | — | (209) 736 0763 | Other | Angels Camp · Calaveras County | — | — |
| Anisko's Plumbing Corp | Zachary Thomas Anisko | — | (209) 770 6404 | Other | Altaville · Calaveras County | — | — |
| Anrey Plumbing Co | Mike Anthony Waldon | — | (209) 743 9571 | Other | Murphys · Calaveras County | — | — |
| Archer Building Company INC | Jay Craig Tippetts | info@archerbuilding.com | (916) 941 6767 | GC, remodel, ADU | Angels Camp · Calaveras County | — | — |
| Ardent Painting INC | Ian Eugene Rohrbach | — | (209) 770 2397 | Windows, patio, painters | Camp Connell · Calaveras County | — | — |
| Arias Tree Service | Arias Monica | — | (510) 684 0684 | Tree | Valley Springs · Calaveras County | — | — |
| Arley Building INC | Christopher Stephen Crockett | — | (714) 308 6499 | GC, remodel, ADU | Angels Camp · Calaveras County | — | — |
| Arnold Electrical INC | Richard Warren Sohm | mo79ae@gmail.com | (209) 795 2529 | Electricians | Arnold · Calaveras County | — | — |
| Arthur Electrical | Scott Brian Arthur | — | (209) 450 8197 | Electricians | Vallecito · Calaveras County | — | — |
| Asap Asphalt Sealing & Patching INC | Benjamin Hermann Klorer | — | (209) 770 8937 | Other | San Andreas · Calaveras County | — | — |
| Austin's Concrete & Asphalt Cutting | Austin's Concrete & Asphalt Cutting | — | (209) 551 0200 | Other | Copperopolis · Calaveras County | — | — |
| Avey Construction | Kenneth Shane Avey | — | (209) 736 0295 | GC, remodel, ADU | Angels Camp · Calaveras County | — | — |
| B & B Kitchen Cabinets | Galen John Zimmerman | — | (209) 785 3764 | Other | San Andreas · Calaveras County | — | — |
| B G Mcguire Construction INC | Guire Brian Mc | — | (209) 365 3385 | GC, remodel, ADU | Valley Springs · Calaveras County | — | — |
| B W C Construction | Brad Wesley Chilcott | — | (323) 796 9313 | GC, remodel, ADU | Wilseyville · Calaveras County | — | — |
| B West Treepro LLC | Bryan Daniel West | — | (209) 273 9794 | Other | Rail Road Flat · Calaveras County | — | — |
| Bales Construction INC | Douglas Leroy Bales | — | (209) 795 4898 | GC, remodel, ADU | Avery · Calaveras County | — | — |
| Ballou Electric INC | Howard Marlin Ballou | — | (209) 814 0662 | Electricians | Murphys · Calaveras County | — | — |
| Barker Company | Sammy Melvin Barker | — | (650) 434 5113 | GC, remodel, ADU | Copperopolis · Calaveras County | — | — |
| Bartel | Michael Alfred Ziegenfuss | — | (209) 728 2660 | Other | Murphys · Calaveras County | — | — |
| Bartlett Jay Hanford | Bartlett Jay Hanford | — | (209) 415 7757 | Other | San Andreas · Calaveras County | — | — |
| Bay Area Drilling & Associates INC | Mark Frank Lucido | — | (925) 584 1141 | Other | Arnold · Calaveras County | — | — |
| Bay City INC | Michael Stephen Nuss | — | (408) 313 4465 | Windows, patio, painters | Murphys · Calaveras County | — | — |
| Bay Grab Bar LLC | William Paul Essert | bill@baygrabbar.com | (510) 714 0800 | Other | Altaville · Calaveras County | — | — |
| Bay Hill Builders | Bay Hill Builders | — | (925) 876 6369 | GC, remodel, ADU | Arnold · Calaveras County | — | — |
| Bayless Electrical Technology | Robert Ronald Bayless | — | (209) 786 6446 | Electricians | Valley Springs · Calaveras County | — | — |
| Bayview Construction | Jason Allan Muller | — | (209) 897 1200 | GC, remodel, ADU | Valley Springs · Calaveras County | — | — |
| Bear Construction Company | Michael Sheldon Barr | — | (408) 770 1441 | GC, remodel, ADU | Arnold · Calaveras County | — | — |
| Bear Valley Plumbing & Building | Bear Valley Plumbing & Building | — | (209) 686 4053 | GC, remodel, ADU | Angels Camp · Calaveras County | — | — |
| Bedrock Excavating INC | Douglas Lee Dubois | — | (209) 293 3184 | Other | West Point · Calaveras County | — | — |
| Bella Vista Pools | Bella Vista Pools | — | (866) 536-7946 | Pool | Temecula · Calaveras County | — | — |
| Ben Saul | Ben Saul | — | (209) 840 2139 | Other | Avery · Calaveras County | — | — |
| Bernasconi Construction | Jonathan Tower Bernasconi | — | (209) 559 4207 | GC, remodel, ADU | Angels Camp · Calaveras County | — | — |
| Best Septic | Best Septic | — | (650) 888 7769 | Other | Murphys · Calaveras County | — | — |
| Better Altitude Properties | Better Altitude Properties | info@betteraltitude.com | (209) 795-8234 | Property managers | Arnold · Calaveras County | — | — |