| Loves Air INC | Mathew C French | — | (209) 566 8686 | HVAC | Salida · Stanislaus County | — | — |
| Low's Construction | Luis Enrique Low | — | (510) 755 5236 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| Lrg Builder Services INC | Louis Rodolfo Gregoris | — | (209) 894 7100 | GC, remodel, ADU | Patterson · Stanislaus County | — | — |
| Lucero Painting | Lucero Painting | — | (209) 605 7791 | Windows, patio, painters | Modesto · Stanislaus County | — | — |
| Luis Pena Painting | Luis Pena Painting | — | (209) 204 1397 | Windows, patio, painters | Ceres · Stanislaus County | — | — |
| Luis' Gardening | Luis' Gardening | — | (209) 544 6103 | Windows, patio, painters | Modesto · Stanislaus County | — | — |
| Lumeon Group LLC | Norberto Enrique Mazorra Guevara | — | (209) 247 0025 | GC, remodel, ADU | Ceres · Stanislaus County | — | — |
| Lunares Flooring | Lunares Flooring | — | (669) 304 9648 | Other | Turlock · Stanislaus County | — | — |
| Lundberg Construction | Richard Alan Lundberg | — | (209) 480 6123 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| Lupe's Pump Co | Jose Guadalupe Aguilar | — | (209) 499 8026 | Other | Ceres · Stanislaus County | — | — |
| Luxor General Construction | Alfonso Del Real Castrejon | — | (510) 326 4328 | GC, remodel, ADU | Patterson · Stanislaus County | — | — |
| Luxury Air Heating & Air Conditioning | Roger Alan Jr Loomis | — | (209) 638 6546 | HVAC | Keyes · Stanislaus County | — | — |
| Lynch Electric | Michael Aaron Lynch | interested@domainmarket.com | (209) 846 4325 | Electricians | Salida · Stanislaus County | — | — |
| Lynn Electric | Daniel Lester Lynn | — | (209) 996 1808 | Electricians | Empire · Stanislaus County | — | — |
| M & M Contractors INC | Thomas Frederick Vance | — | (209) 510 0332 | Other roofers | Riverbank · Stanislaus County | — | — |
| M & S Ortega Construction | Jose Manuel Ortega | — | (209) 613 8071 | GC, remodel, ADU | Riverbank · Stanislaus County | — | — |
| M Alcazar Construction | Mario Alberto Alcazar | — | (209) 623 9929 | GC, remodel, ADU | Turlock · Stanislaus County | — | — |
| M Bettencourt Construction | Salutino Manuel Bettencourt | — | (209) 632 0569 | GC, remodel, ADU | Denair · Stanislaus County | — | — |
| M C C A Construction INC | Gary Warren Mc Andrews | — | (209) 522 3040 | GC, remodel, ADU | Salida · Stanislaus County | — | — |
| M D Smith Heating & Air Conditioning INC | Matthew Douglas Smith | — | (209) 622 0896 | HVAC | Modesto · Stanislaus County | — | — |
| M G Ceramic Tile | M G Ceramic Tile | — | (209) 605 0103 | GC, remodel, ADU | Salida · Stanislaus County | — | — |
| M Jacobs Plumbing | M Jacobs Plumbing | — | (209) 595 6669 | Other | Oakdale · Stanislaus County | — | — |
| M K Pool Service | Michael Joseph Kim | mkpoolservice00@gmail.com | (209) 261 4838 | Pool | Turlock · Stanislaus County | — | — |
| M L Garage Doors | M L Garage Doors | — | (408) 661 2638 | Other | Modesto · Stanislaus County | — | — |
| M Torres Painting INC | Miguel Angel Torres Gonzalez | — | (209) 985 2764 | Windows, patio, painters | Hughson · Stanislaus County | — | — |
| M&m Pool Repair | Hernandez Cristopher Munoz | — | (209) 408 5899 | Pool | Modesto · Stanislaus County | — | — |
| M/c Construction | Ray Mumraiz Khan | — | (510) 755 4006 | GC, remodel, ADU | Salida · Stanislaus County | — | — |
| M3 General Contracting INC | Davin Joseph Middleton | — | (209) 607 9721 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| M4 Concrete And Drywall INC | Miguel Angel Mendoza | — | (209) 850 9250 | Other | Turlock · Stanislaus County | — | — |
| M7 Electric | Zechiel James Medina-fann | — | (209) 678 5387 | Electricians | Denair · Stanislaus County | — | — |
| M8 Builders INC | Donald Joseph Degraff | — | (209) 840 3150 | GC, remodel, ADU | Oakdale · Stanislaus County | — | — |
| Mac Welding INC | Tyler Blake Portusach | — | (209) 496 4052 | Other | Turlock · Stanislaus County | — | — |
| Machado & Sons Construction INC | Manuel Bernard Machado | — | (209) 632 5260 | GC, remodel, ADU | Turlock · Stanislaus County | — | — |
| Mack Electric | Michael Joseph Mack | — | (209) 988 7115 | Electricians | Oakdale · Stanislaus County | — | — |
| Macson Construction | Maciel Salvador | macson.construction@outlook.com | (209) 535 4969 | GC, remodel, ADU | Denair · Stanislaus County | — | — |
| Macson Construction INC | Manuel Jr Ayala Ochoa | macson.construction@outlook.com | (209) 622 9534 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| Maden Homebuilding INC | Michael Desmond Jr Maden | — | (209) 860 2151 | GC, remodel, ADU | Waterford · Stanislaus County | — | — |
| Madrigals Custom Works Construction INC | Heriberto Madrigal | — | (209) 598 5794 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| Madsen Construction & Design INC | Gary Edward Madsen | — | (209) 678 0454 | GC, remodel, ADU | Hickman · Stanislaus County | — | — |
| Mag Flooring | Mag Flooring | — | (209) 587 3908 | Other | Oakdale · Stanislaus County | — | — |