| Mondragon's Construction | Mondragon-cuellar Ismael | — | (805) 674 1305 | GC, remodel, ADU | Cambria · San Luis Obispo County | — | — |
| Monkey Puzzle LLC | Mario Henry Gonzales | hi@mystore.com | (425) 770 6232 | GC, remodel, ADU | Morro Bay · San Luis Obispo County | — | — |
| Montijo Construction | Karson Robert Montijo | — | (661) 912 9911 | GC, remodel, ADU | Atascadero · San Luis Obispo County | — | — |
| Monty's Backhoe Service | Monty Anslem Holden | — | (805) 459 5676 | Other | Nipomo · San Luis Obispo County | — | — |
| Moose Landscaping | Moose Landscaping | patrick@mooselandscaping.com | (805) 215 4241 | Windows, patio, painters | Templeton · San Luis Obispo County | — | — |
| More Than Carpentry | More Than Carpentry | — | (805) 748 9597 | GC, remodel, ADU | Los Osos · San Luis Obispo County | — | — |
| Morningstar Construction | James Alvin Morningstar | — | (805) 459 8088 | GC, remodel, ADU | Oceano · San Luis Obispo County | — | — |
| Morro Bay Cabinets INC | Cheryl Ann Gordon | — | (805) 238 7224 | Other | Paso Robles · San Luis Obispo County | — | — |
| Morro Bay Plumbing | Morro Bay Plumbing | — | (805) 772 8300 | Other | Grover Beach · San Luis Obispo County | — | — |
| Mosher Heating And Air | Mosher Heating And Air | — | (805) 434 8045 | HVAC | Paso Robles · San Luis Obispo County | — | — |
| Mosley Plumbing LLC | Kyle Brandon Mosley | — | (805) 888 9376 | Other | Arroyo Grande · San Luis Obispo County | — | — |
| Moss Construction & Design | Herbert Henry Iii Moss | — | (805) 235 3284 | GC, remodel, ADU | Cambria · San Luis Obispo County | — | — |
| Mother Earth Landscapes | Mother Earth Landscapes | info@motherearthlandscapes.com | (805) 801 7310 | Windows, patio, painters | Los Osos · San Luis Obispo County | — | — |
| Motley Drywall | Motley Drywall | — | (805) 674 6748 | Other | Atascadero · San Luis Obispo County | — | — |
| Mount Construction | Chad Richard Mount | — | (805) 863 5250 | GC, remodel, ADU | Grover Beach · San Luis Obispo County | — | — |
| Mountain Pacific Builders INC | Kyle Anthony Martin | kyle@mountainpacificbuilders.com | (805) 441 9297 | GC, remodel, ADU | San Luis Obispo · San Luis Obispo County | — | — |
| Mountain View Roofing | Jonathan Jose Esguerra Perez | interested@domainmarket.com | (805) 460 8182 | Other roofers | San Luis Obispo · San Luis Obispo County | — | — |
| Mr Maintenance Plus | Mr Maintenance Plus | — | (805) 235 4426 | GC, remodel, ADU | San Luis Obispo · San Luis Obispo County | — | — |
| Mr Tom's Tile Corp | Thomas Alan Hilliard | — | (805) 466 8453 | GC, remodel, ADU | Paso Robles · San Luis Obispo County | — | — |
| Mr. Perry's Heating & Air LLC | Emiliano Jesus Perry | — | (805) 464 9111 | HVAC | Atascadero · San Luis Obispo County | — | — |
| Mrc Construction | Michael Robert Crisp | — | (805) 440 9024 | Electricians | Nipomo · San Luis Obispo County | — | — |
| Msb Builders | Msb Builders | — | (805) 748 8080 | GC, remodel, ADU | Arroyo Grande · San Luis Obispo County | — | — |
| Msbrown Surface Repair | Msbrown Surface Repair | — | (562) 818-6212 | Restoration | San Luis Obispo · San Luis Obispo County | — | — |
| Msmm INC | Curtis Dean Moore | — | (805) 543 1090 | HVAC | San Luis Obispo · San Luis Obispo County | — | — |
| Mt Heating And Cooling | Mt Heating And Cooling | — | (805) 975 5180 | HVAC | Paso Robles · San Luis Obispo County | — | — |
| Mta Plumbing INC | Mario Dominguez | — | (805) 260 4578 | Other | Nipomo · San Luis Obispo County | — | — |
| Mullahey Construction | Mullahey Sean | — | (805) 455 4225 | GC, remodel, ADU | Pismo Beach · San Luis Obispo County | — | — |
| Muniz Excavating INC | Joshua Rory Joe Muniz | — | (805) 550 6317 | Other | Paso Robles · San Luis Obispo County | — | — |
| Munoz Tree Care | Munoz Tree Care | — | (805) 296 9707 | Other | Cambria · San Luis Obispo County | — | — |
| Murray Construction Company | Thomas Patrick Murray | — | (805) 550 7646 | GC, remodel, ADU | Arroyo Grande · San Luis Obispo County | — | — |
| Mustang Computers | Mustang Computers | — | (805) 528 4027 | Other | Nipomo · San Luis Obispo County | — | — |
| Mustang Welding LLC | Joel Michael Potter | — | (805) 250 6710 | Other | Grover Beach · San Luis Obispo County | — | — |
| Muth Electric INC | Brady Lee Muth | — | (805) 540 0989 | Electricians | Arroyo Grande · San Luis Obispo County | — | — |
| Myers Home Inspection LLC | Myers Home Inspection LLC | — | (805) 470-9191 | Inspectors | Atascadero · San Luis Obispo County | — | — |
| Mylan Garden Designs | Mylan Garden Designs | — | (805) 994 8318 | GC, remodel, ADU | Nipomo · San Luis Obispo County | — | — |
| N - Hance | Michael Rozo | — | (805) 473 9663 | Other | Grover Beach · San Luis Obispo County | — | — |
| N Brent Knowles Construction | Norman Brent Knowles | — | (805) 995 3214 | Other | Cayucos · San Luis Obispo County | — | — |
| N F S Services | Norman Frank Solis | — | (805) 473 0140 | Other | Pismo Beach · San Luis Obispo County | — | — |
| N K Builders Incorporated | Timothy Michael Tillman | — | (805) 544 4457 | GC, remodel, ADU | San Luis Obispo · San Luis Obispo County | — | — |
| N R B | N R B | — | (805) 544 8894 | GC, remodel, ADU | San Luis Obispo · San Luis Obispo County | — | — |