| 60 Hertz Electric | Nigel Lowel Fluharty | 60hertzelectric@gmail.com | (510) 599 6565 | Electricians | Sonora · Tuolumne County | — | — |
| 780 Painting | 780 Painting | — | (707) 297 2701 | Windows, patio, painters | Sonora · Tuolumne County | — | — |
| A C Seal Coating INC | Michael Anthony Cognetti | — | (209) 532 8955 | Other | Sonora · Tuolumne County | — | — |
| A Celtic Craftsman Builders | A Celtic Craftsman Builders | — | (209) 459 2936 | GC, remodel, ADU | Tuolumne · Tuolumne County | — | — |
| A M Chase Construction | Andy Chase | — | (209) 352 6182 | GC, remodel, ADU | Jamestown · Tuolumne County | — | — |
| A Rose Plumbing INC | Fremont Scott Rose | — | (209) 586 1002 | Other | Twain Harte · Tuolumne County | — | — |
| Aaron Richardson Construction | Aaron Thomas Richardson | aaronrichconst1@gmail.com | (209) 353 6078 | GC, remodel, ADU | Twain Harte · Tuolumne County | — | — |
| Accent Tile Company Corp | Karl Christian Keul | — | (209) 459 0260 | Other | Tuolumne · Tuolumne County | — | — |
| Ace Tree Service | Brian Edward Finigan | — | (209) 768 6226 | Tree | Sonora · Tuolumne County | — | — |
| Adam Dominick Construction | Adam Matthew Dominick | — | (209) 743 4045 | GC, remodel, ADU | Soulsbyville · Tuolumne County | — | — |
| Adam Ehlers Construction | Adam Jacob Ehlers | — | (209) 663 0222 | GC, remodel, ADU | Columbia · Tuolumne County | — | — |
| Adam Parker Painting | Adam Parker Painting | — | (209) 712 0450 | Windows, patio, painters | Mi-wuk Village · Tuolumne County | — | — |
| Addis Construction Co | Tewolde Berhan Berhane | — | (209) 743 1205 | GC, remodel, ADU | Sonora · Tuolumne County | — | — |
| Airworx LLC | Joseph Anthony Ii Dinner | — | (209) 206 0098 | HVAC | Jamestown · Tuolumne County | — | — |
| Al's Plumbing & Electric | Alan Robert Hodson | — | (209) 559 2700 | Electricians | Pinecrest · Tuolumne County | — | — |
| Alderson Fencing | Kit James Lasee | — | (209) 532 8283 | Other | Jamestown · Tuolumne County | — | — |
| Alex Awalt Painting LLC | Alexander Theron Awalt | — | (209) 338 8560 | Windows, patio, painters | Sonora · Tuolumne County | — | — |
| Algerine West Construction INC | Montgomery Lowell West | — | (209) 984 1883 | Other | Jamestown · Tuolumne County | — | — |
| All American Glass | All American Glass | l943357@pgwag.com | — | Windows, patio, painters | Tuolumne · Tuolumne County | — | — |
| All In One Development | All In One Development | — | (209) 532 1521 | GC, remodel, ADU | Jamestown · Tuolumne County | — | — |
| All Phases Electric | Robert Eugene Dart | — | (619) 977 6860 | Electricians | Sonora · Tuolumne County | — | — |
| Alley Tree And Landscape INC | Dean Jonathan Alley | — | (209) 352 7920 | Windows, patio, painters | Sonora · Tuolumne County | — | — |
| Allgood Builders | Allgood Builders | — | (209) 743 7805 | GC, remodel, ADU | Twain Harte · Tuolumne County | — | — |
| Alliance Electric | Steven Wm Johnson | — | (209) 559 3964 | Electricians | Columbia · Tuolumne County | — | — |
| Allstar Construction | Charles Eugene Reber | — | (209) 768 2478 | Other roofers | Twain Harte · Tuolumne County | — | — |
| Alm Welding And Fabrication INC | Adam Lloyd May | — | (209) 559 5924 | Other | Tuolumne · Tuolumne County | — | — |
| Aloha Painting By Kimo INC | James David Malaia | — | (209) 352 0131 | Windows, patio, painters | Tuolumne · Tuolumne County | — | — |
| Alpine Construction | Carson Trevor Scheftner | — | (209) 770 5399 | GC, remodel, ADU | Sonora · Tuolumne County | — | — |
| Alternative Energy Designs INC DBA A E D Construction | Cooper Jack Kessel | — | (209) 532 1123 | GC, remodel, ADU | Sonora · Tuolumne County | — | — |
| Altitude 108 Construction INC | William Nathan Simpson | — | (209) 591 3810 | HVAC | Soulsbyville · Tuolumne County | — | — |
| Amaze Painting | Dennis Michael Kavie | — | (209) 768 5287 | Windows, patio, painters | Jamestown · Tuolumne County | — | — |
| Ambrosia's Chimney Sweep | Ambrosia's Chimney Sweep | — | (209) 532 4883 | Other | Twain Harte · Tuolumne County | — | — |
| American Made Masonry | American Made Masonry | jim@americanmademasonry.com | (209) 770 3206 | GC, remodel, ADU | Columbia · Tuolumne County | — | — |
| Anchor Pest | Anchor Pest | — | (209) 536-1981 | Pest, tile roofs | Sonora · Tuolumne County | — | — |
| Anders Construction | Evan Taylor Anders | — | (408) 843 7519 | GC, remodel, ADU | Sonora · Tuolumne County | — | — |
| Andreetta Ag Construction | Marvin James Andreetta | — | (209) 601 1801 | GC, remodel, ADU | Jamestown · Tuolumne County | — | — |
| Angel Roofing INC | Angel Roofing INC | — | (402) 352-3763 | Other roofers | Angels Camp · Tuolumne County | — | — |
| Angels Pest Control | Angels Pest Control | — | (209) 586-2275 | Pest, tile roofs | Mi-Wuk Village · Tuolumne County | — | — |
| Anthony A Armstrong | Anthony A Armstrong | — | (209) 768 7511 | GC, remodel, ADU | Groveland · Tuolumne County | — | — |
| Arellano Built General Contractor | Arellano Built General Contractor | — | (209) 586 2100 | GC, remodel, ADU | Jamestown · Tuolumne County | — | — |