| Krisman Construction | Eric Nicholas Krisman | — | (209) 419 0022 | Other | Ione · Amador County | — | — |
| Ks Pro Remodeling | Ks Pro Remodeling | — | (916) 533 1946 | GC, remodel, ADU | Pine Grove · Amador County | — | — |
| L B Construction | Brusatori Lester | — | (916) 837 3188 | GC, remodel, ADU | Amador City · Amador County | — | — |
| L N C Excavating And Construction | Leo Nicholas Chronis | — | (209) 245 3417 | GC, remodel, ADU | Ione · Amador County | — | — |
| Lacantina Doors | Lacantina Doors | — | (833) 408-9977 | Windows, patio, painters | Oceanside · Amador County | — | — |
| Lana Vukovich | Lana Vukovich | — | (209) 770 0111 | GC, remodel, ADU | Jackson · Amador County | — | — |
| Lazar Construction & Builders INC | Marie Mable Lazar | — | (209) 304 6627 | GC, remodel, ADU | Ione · Amador County | — | — |
| Lewis C Yager | Lewis C Yager | — | (209) 274 4135 | Other | Ione · Amador County | — | — |
| Lewis Plumbing LLC | Tiffany Hill Lewis | — | (209) 296 3884 | GC, remodel, ADU | Pine Grove · Amador County | — | — |
| Light Air And Space Construction Company | David Bruce Guthridge | — | (408) 640 2899 | GC, remodel, ADU | Sutter Creek · Amador County | — | — |
| Lighthouse Electric | Kevin Lynn Yancy | — | (360) 565 6936 | Electricians | Ione · Amador County | — | — |
| Little Electric | Eric Lee Little | — | (209) 418 5639 | Electricians | Pioneer · Amador County | — | — |
| Live Action Engineering INC | John Robert Johnstone | — | (209) 283 4509 | Other | Amador City · Amador County | — | — |
| Lnc Septics | Lnc Septics | lane@lncseptics.com | (209) 781 5327 | Other | Plymouth · Amador County | — | — |
| Lodi Painting Co | Terry Lee Jr Krause | — | (209) 366 4023 | Windows, patio, painters | Ione · Amador County | — | — |
| Loggin Logan Tree Service | Logan John Carnell | — | (209) 296 8733 | Tree | Pine Grove · Amador County | — | — |
| Lopez Landscape Services | Lopez Everardo | lopezlandscapeservices417@gmail.com | (209) 304 4372 | Windows, patio, painters | Sutter Creek · Amador County | — | — |
| Lpgasco LLC | Gregory Frank Martinsen | — | (209) 256 1813 | Other | Jackson · Amador County | — | — |
| Lyman Corporation INC | Jared Clint Lyman | — | (209) 351 0904 | Electricians | Plymouth · Amador County | — | — |
| M B Quality Painting | M B Quality Painting | — | (209) 256 5200 | Windows, patio, painters | Pine Grove · Amador County | — | — |
| M Guadagnolo | M Guadagnolo | — | (209) 274 4002 | Other | Ione · Amador County | — | — |
| Machado Plumbing | Machado Plumbing | — | (209) 743 8869 | Other | Jackson · Amador County | — | — |
| Maines Construction | Seth Allan Maines | — | (209) 256 0430 | GC, remodel, ADU | Pine Grove · Amador County | — | — |
| Mann's Heating And Air Con | Mann's Heating And Air Con | — | (209) 256 5111 | HVAC | Plymouth · Amador County | — | — |
| Marhefka Electric | Kent Emil Marhefka | — | (209) 304 1586 | Electricians | Pine Grove · Amador County | — | — |
| Mark C Johnston INC | Mark Christian Johnston | — | (916) 825 4450 | Other | Plymouth · Amador County | — | — |
| Mark Fredrick Pump & Supply Co | Mark S Fredrick | — | (209) 223 3731 | Other | Jackson · Amador County | — | — |
| Massaglia Construction | Matthew Philip Massaglia | — | (209) 810 4281 | GC, remodel, ADU | Pioneer · Amador County | — | — |
| Mattathais Construction | John Zachary Matta | — | (209) 331 3394 | GC, remodel, ADU | Jackson · Amador County | — | — |
| Matthew L Brown DBA Dirt Wurkz | Dirt Wurkz | — | (209) 304 9923 | Other | Sutter Creek · Amador County | — | — |
| Mc Coey Construction | Jason Corby Mc Coey | — | (209) 283 3898 | GC, remodel, ADU | Pine Grove · Amador County | — | — |
| Mccurdy Floorcovering | Mccurdy Floorcovering | — | (209) 332 7395 | Other | Pioneer · Amador County | — | — |
| Mcp Painters INC | Michael Clinton Piatnik | — | (916) 798 9577 | Windows, patio, painters | Fiddletown · Amador County | — | — |
| Melvin R Emerson Jr | Melvin R Emerson Jr | — | (209) 765 0461 | GC, remodel, ADU | Jackson · Amador County | — | — |
| Meneely Construction | Kenneth Edward Meneely | — | (209) 267 8061 | GC, remodel, ADU | Sutter Creek · Amador County | — | — |
| Michael Hines Painting | Michael Hines Painting | — | (209) 256 4587 | Windows, patio, painters | Ione · Amador County | — | — |
| Michael Steven Konieczka | Michael Steven Konieczka | — | (209) 418 8581 | GC, remodel, ADU | Pine Grove · Amador County | — | — |
| Mike Van De Hei | Mike Van De Hei | — | (209) 295 4241 | Other | Pioneer · Amador County | — | — |
| Miller Construction | Kreg Eugene Miller | — | (209) 765 9762 | GC, remodel, ADU | Sutter Creek · Amador County | — | — |
| Minarcin Construction Company INC | Robert Michael Minarcin | — | (209) 418 5314 | GC, remodel, ADU | Ione · Amador County | — | — |