| Mitchell Harrison | Mitchell Harrison | — | (530) 691 8611 | Other | Shasta Lake · Shasta County | — | — |
| Mitchell's Painting | Mitchell's Painting | — | (530) 949 6085 | Windows, patio, painters | Redding · Shasta County | — | — |
| Mk Construction | Mark Edwin Morrison | — | (805) 610 7564 | GC, remodel, ADU | Anderson · Shasta County | — | — |
| Mm Hernandez Roofing Corp | Trujillo Martin Hernandez | — | (539) 691 6276 | Other roofers | Shingletown · Shasta County | — | — |
| Modern Comfort Solutions INC | James Dennis Silvio | moderncomfortsolutions@yahoo.com | (530) 255 8888 | HVAC | Redding · Shasta County | — | — |
| Modern Home Solutions | Modern Home Solutions | — | (530) 355 0665 | GC, remodel, ADU | Redding · Shasta County | — | — |
| Modern Improvements INC DBA Modern Plumbing Company | Jesus Francisco Flores | — | (530) 921 9092 | Other | Redding · Shasta County | — | — |
| Modern Painting | Modern Painting | — | (530) 227 4961 | Windows, patio, painters | Redding · Shasta County | — | — |
| Monroe Mechanical LLC | Mark Anthony Monroe | — | (530) 515 4529 | HVAC | Shasta · Shasta County | — | — |
| Montgomery Steve Tile | Montgomery Steve Tile | — | (951) 751 2440 | Other | Anderson · Shasta County | — | — |
| Monty Jackson Painting | Monty Jackson Painting | — | (530) 227 9077 | Windows, patio, painters | Oak Run · Shasta County | — | — |
| Moore Enterprises | Kenneth Allen Moore | — | (530) 351 2243 | GC, remodel, ADU | Palo Cedro · Shasta County | — | — |
| Moore Excavating | Moore Excavating | — | (530) 529 0267 | Other | Cottonwood · Shasta County | — | — |
| Moore Glass | Moore Glass | — | (530) 515 9194 | Windows, patio, painters | Cottonwood · Shasta County | — | — |
| Moreno's Landscape LLC | Moreno Patino Ignacio | — | (530) 410 4552 | Windows, patio, painters | Redding · Shasta County | — | — |
| Morgan Creek Construction | Kevin Eugene Brink | — | (530) 275 5534 | Other | Redding · Shasta County | — | — |
| Morgan Creek Construction INC | Kevin Eugene Brink | — | (530) 351 2705 | GC, remodel, ADU | Redding · Shasta County | — | — |
| Morgan Telecom INC | Jay Brian Ii Windle | — | (530) 244 2400 | Other | Anderson · Shasta County | — | — |
| Morningstar Electric INC | Michael James Morningstar | micah@micahrich.com | (530) 921 0560 | Electricians | Castella · Shasta County | — | — |
| Mosher Construction Company | Dale Franklin Mosher | — | (530) 515 2640 | GC, remodel, ADU | Shasta Lake · Shasta County | — | — |
| Moule's California Glass INC | Laura Dianne Moule Ware | — | (530) 221 5100 | Windows, patio, painters | Redding · Shasta County | — | — |
| Mountain Thunder Tree Services | Lenard Gene Jr Tomas | — | (530) 999 1659 | Tree | Burney · Shasta County | — | — |
| Mountain Topper Floor Covering | Thomas Patrick Oglesby | — | (530) 524 8581 | Other | Redding · Shasta County | — | — |
| Mountain Valley Precision Painting | Mountain Valley Precision Painting | — | (530) 209 3892 | Windows, patio, painters | Redding · Shasta County | — | — |
| Mountain Wood Floors | Mountain Wood Floors | mountainwoodfloors@gmail.com | (530) 318 5783 | Other | Shingletown · Shasta County | — | — |
| Mouser Construction | Andrew James Mouser | — | (530) 263 5633 | GC, remodel, ADU | Anderson · Shasta County | — | — |
| Mpe Coring | Troy William Kamisky | — | (530) 246 9499 | Other | Redding · Shasta County | — | — |
| Mpk Home Improvement | Mpk Home Improvement | — | (530) 515 2471 | GC, remodel, ADU | Anderson · Shasta County | — | — |
| Mpr Construction | Mason Paul Rodriguez | — | (530) 921 1729 | GC, remodel, ADU | Redding · Shasta County | — | — |
| Mr Rooter Of Shasta County | James A Firmalo | — | (530) 221 5700 | Other | Redding · Shasta County | — | — |
| Msy Construction | Celso Jesus Salaiz | — | (925) 435 6464 | GC, remodel, ADU | Redding · Shasta County | — | — |
| Mt Shasta Electric INC | Mt Shasta Electric INC | — | (530) 926-4653 | Electricians | Mt Shasta · Shasta County | — | — |
| Mt Shasta Masonry | Mt Shasta Masonry | — | (530) 925 9922 | Windows, patio, painters | Anderson · Shasta County | — | — |
| Mtm Construction | Mckay Thomas Mansfield | — | (530) 917 5169 | GC, remodel, ADU | Redding · Shasta County | — | — |
| Muncrief Construction | William Henry Muncrief | — | (530) 515 0693 | GC, remodel, ADU | Redding · Shasta County | — | — |
| Muse Concrete Contractors INC | Boyce Leon Muse | — | (530) 226 5151 | GC, remodel, ADU | Redding · Shasta County | — | — |
| Mustard Seed Landscape Services | John Michael Iii Moran | — | (530) 949 8418 | Windows, patio, painters | Redding · Shasta County | — | — |
| N & T Digmore INC | Brian Thomas Taylor | — | (530) 241 2992 | Other | Redding · Shasta County | — | — |
| N - Hance Wood Refinishing | Lynn Ellen Nance | — | (530) 221 3275 | Windows, patio, painters | Redding · Shasta County | — | — |
| N S W D Incorporated | Michael John Peletta | — | (530) 242 1601 | GC, remodel, ADU | Redding · Shasta County | — | — |