| Lotus Landscaping INC | Paula Russell | — | (209) 640 2906 | Windows, patio, painters | Mountain House · San Joaquin County | — | — |
| Lovotti Air | Scott Michael Lovotti | admin@lovottiinc.com | (209) 931 2100 | HVAC | Stockton · San Joaquin County | — | — |
| Lozano And Delgado INC | Irene Marie Delgado | — | (209) 983 0212 | Other | Stockton · San Joaquin County | — | — |
| Lozano Landscaping & Turf | Lozano Landscaping & Turf | — | (916) 207 1174 | Windows, patio, painters | Acampo · San Joaquin County | — | — |
| Lozano's Roofing Services | Cesar Octavio Lozano | — | (408) 807 8750 | Other roofers | Lathrop · San Joaquin County | — | — |
| Lqtg INC | Fernando Marcos Ramirez | — | (209) 712 7536 | Other | Lodi · San Joaquin County | — | — |
| Lrv Plumbing Service | Luis Ricardo Velazquez | 11rvelazquez@gmail.com | (209) 604 9758 | Other | Escalon · San Joaquin County | — | — |
| Lt Plumbing INC | Logan Mathew Takacs | — | (209) 510 3006 | Other | Manteca · San Joaquin County | — | — |
| Lu Brothers Landscape Construction | Duy Van Lu | — | (209) 373 0310 | Windows, patio, painters | Stockton · San Joaquin County | — | — |
| Lua Barajas Concrete | Lua Barajas Concrete | contact@luabarajasconcrete.com | (209) 470 5974 | Other | Stockton · San Joaquin County | — | — |
| Lucas Tile | Lucas Tile | anapbm@gmail.com | (408) 836 1781 | Other | Tracy · San Joaquin County | — | — |
| Lucatero Insulation Specialties | Santiago Lucatero | — | (510) 715 1464 | Other | Manteca · San Joaquin County | — | — |
| Luis's Carpet | Luis's Carpet | — | (209) 747 2161 | Other | Lodi · San Joaquin County | — | — |
| Lujano Concrete INC | Juan Axel Raygoza Lujano | — | (559) 813 0907 | Other | Lodi · San Joaquin County | — | — |
| Lujano Jr Lath & Plaster INC | Saucedo Gonzalo Lujano | — | (209) 244 1933 | Other | Stockton · San Joaquin County | — | — |
| Lumcuit INC | Padilla Fernando Lopez | — | (209) 298 6416 | Electricians | Stockton · San Joaquin County | — | — |
| Luminate Electric | Jairh Alfredo Sanchez Alvarado | info@luminateelectric.com | (510) 303-0655 | Electricians | Lathrop · San Joaquin County | — | — |
| Lund Refrigeration & Air Conditioning | Lund Refrigeration & Air Conditioning | — | (209) 275 5540 | HVAC | Ripon · San Joaquin County | — | — |
| Lundbom Construction | Robert Lewis Lundbom | — | (209) 823 4102 | GC, remodel, ADU | Manteca · San Joaquin County | — | — |
| Luther Construction | Craig Arnold Luther | — | (209) 712 1822 | GC, remodel, ADU | Lockeford · San Joaquin County | — | — |
| Luxury Grading Construction Consultant | Brodie Duane Downs | — | (209) 471 7183 | Pool | Ripon · San Joaquin County | — | — |
| Luz Electric | Barrios Solis Ignacio | — | (209) 990 4887 | Electricians | Stockton · San Joaquin County | — | — |
| Lvbd Group | Maynard Scott Hall | — | (209) 410 9922 | Other | Stockton · San Joaquin County | — | — |
| Lyle E Coe DBA Coe & Company | Lyle Eugene Coe | — | (209) 403 8186 | Electricians | Lodi · San Joaquin County | — | — |
| Lynx Tile INC | Castro Andres Valdez | — | (209) 594 5619 | Other | Stockton · San Joaquin County | — | — |
| Lz Painting | Lz Painting | — | (209) 513 2127 | Windows, patio, painters | Stockton · San Joaquin County | — | — |
| M & Ca Plumbing INC | Quintana Cesar Alvarez | — | (209) 641 5433 | Other | Stockton · San Joaquin County | — | — |
| M & D Painting Service INC | Marco Antonio Arroyo Mejia | — | (408) 497 6267 | Windows, patio, painters | Ripon · San Joaquin County | — | — |
| M & J Construction | Micky Shane Mcfarren | — | (209) 268 6467 | GC, remodel, ADU | Acampo · San Joaquin County | — | — |
| M & J Construction | Miguel Angel Portillo | — | (209) 481 2299 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| M & J Restaurant Equipment | M & J Restaurant Equipment | — | (209) 993 3260 | HVAC | Stockton · San Joaquin County | — | — |
| M & K Builders INC | Jerry Martin Kaufman | — | (209) 478 7531 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| M & M Garage Doors | M & M Garage Doors | — | (925) 219 2194 | Other | Manteca · San Joaquin County | — | — |
| M A Santiago Handyman Services INC | Miguel Angel Santiago | — | (209) 891 8271 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| M C I Engineering INC | Kurt Thomas Mc Fadden | — | (209) 472 1607 | GC, remodel, ADU | Lodi · San Joaquin County | — | — |
| M D H Construction | Michael Dean Henninger | — | (209) 329 6253 | GC, remodel, ADU | Lodi · San Joaquin County | — | — |
| M F V Associates INC DBA The Glass Guru S J V | Brenda Ann Vecchiarelli | — | (209) 625 8156 | Windows, patio, painters | Lodi · San Joaquin County | — | — |
| M G A Tree Service | Martha Gabriela Gonzalez Angulo | — | (408) 841 3606 | Tree | Stockton · San Joaquin County | — | — |
| M H P Builders INC | Samantha Matthews Chamberlain | — | (209) 951 6190 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| M Iii Construction | Melvin Guy Iii Wilson | — | (209) 740 2108 | GC, remodel, ADU | Tracy · San Joaquin County | — | — |