| Lepe's Construction | Lepe-arrizon Felipe | — | (707) 704 0667 | GC, remodel, ADU | Vacaville · Solano County | — | — |
| Level 5 Drywall | Level 5 Drywall | — | (707) 249 4364 | Other | Vacaville · Solano County | — | — |
| Level Up Builder | Level Up Builder | — | (707) 624 5000 | GC, remodel, ADU | Vacaville · Solano County | — | — |
| Lewis Construction | David Lewis Lee | — | (707) 365 2069 | GC, remodel, ADU | Vacaville · Solano County | — | — |
| Lf Drywall INC | Luis Fernando Flores Anaya | — | (510) 260 5148 | Other | Vallejo · Solano County | — | — |
| Lightspeed Restoration Of Pleasant Hill | Lightspeed Restoration Of Pleasant Hill | lr.pleasant-hill@lightspeedrestoration.com | (925) 430-5584 | Restoration | Concord · Solano County | — | — |
| Lind Marine LLC | Aaron Jude Lind | — | (707) 762 7251 | Other | Vallejo · Solano County | — | — |
| Link Metalworks | Link Metalworks | — | (707) 315 8239 | Other | Vallejo · Solano County | — | — |
| Lion's Floor Covering | Morales Israel Acosta | — | (510) 691 1298 | Other | Vallejo · Solano County | — | — |
| Lions Gate Electric | Eric Lee Castleman | — | (707) 430 2039 | Electricians | Fairfield · Solano County | — | — |
| Lissick's Heating And Air Conditioning | Lissick's Heating And Air Conditioning | — | (707) 731 7365 | HVAC | Fairfield · Solano County | — | — |
| Lister Construction INC | Walter Charles Lister | — | (707) 451 2813 | GC, remodel, ADU | Vacaville · Solano County | — | — |
| Liu Plumbing | Liu Plumbing | — | (415) 314 8382 | Other | Vallejo · Solano County | — | — |
| Live Action Plumbing INC | Noe Eliseo Pineda | — | (707) 704 0008 | Other | Vallejo · Solano County | — | — |
| Live Oak Landscaping INC | John Philip Gilpin | — | (707) 592 0581 | Windows, patio, painters | Vacaville · Solano County | — | — |
| Live Wire Electric | Bret James Santiago | — | (707) 761 2150 | Electricians | Vacaville · Solano County | — | — |
| Living Earth Gardens INC | Stephen Adam Berry | livingearthgardens@gmail.com | (707) 980 0172 | Windows, patio, painters | Vallejo · Solano County | — | — |
| Lloyd's Fence Co | Lloyd Lyman Wilder | — | (707) 410 9545 | Other | Fairfield · Solano County | — | — |
| Lobo Construction INC | Marthen Lobo | — | (510) 778 0236 | GC, remodel, ADU | Fairfield · Solano County | — | — |
| Lobo Mechanical HVAC Solutions | Isaac Pena | — | (707) 676 0900 | HVAC | Dixon · Solano County | — | — |
| Longtin Construction | David Cyril Longtin | — | (510) 673 6274 | GC, remodel, ADU | Fairfield · Solano County | — | — |
| Lonnie Smithson Home Improvements LLC | Lonnie Ray Smithson | — | (707) 365 3320 | GC, remodel, ADU | Vacaville · Solano County | — | — |
| Loudermilk Construction | Robert Burton Loudermilk | — | (707) 373 4830 | GC, remodel, ADU | Benicia · Solano County | — | — |
| Loudermilk Renovations | Loudermilk Renovations | — | (707) 373 0290 | GC, remodel, ADU | Benicia · Solano County | — | — |
| Louie Concrete Co | Luis Ortega Duenas | luisjr@louieconcrete.com | (707) 704 9785 | Other | Vallejo · Solano County | — | — |
| Louis's Home Repair & Remodeling | Louis's Home Repair & Remodeling | — | (707) 429 8909 | GC, remodel, ADU | Fairfield · Solano County | — | — |
| Low Voltage Electric | Paul Alphius Pryce | — | (707) 316 9702 | Other | Vacaville · Solano County | — | — |
| Lujan Telecom | Lujan Telecom | — | (707) 333 1606 | Other | Vallejo · Solano County | — | — |
| Luke Yongjin Lee | Luke Yongjin Lee | — | (818) 669 2725 | HVAC | Fairfield · Solano County | — | — |
| Luxe Spray Foam Insulation | Ricardo Eduardo Fernandez La Torre | — | (650) 534 4489 | Other | Fairfield · Solano County | — | — |
| Lynell Davis | Lynell Davis | — | (209) 241 7404 | Pool | Suisun City · Solano County | — | — |
| M & G General Landscaping INC | Mario Martinez Chavez | — | (707) 439 1902 | Windows, patio, painters | Vallejo · Solano County | — | — |
| M & N Construction | George Jr Nunez | — | (707) 685 7488 | GC, remodel, ADU | Vacaville · Solano County | — | — |
| M And O Edwards INC DBA Mr Rooter Plumbing | Olga Kathleen Edwards | — | (707) 864 1773 | Other | Fairfield · Solano County | — | — |
| M B Services | Rudy Joel Melendez | — | (707) 290 7716 | Other | Suisun City · Solano County | — | — |
| M C Manzo Concrete | M C Manzo Concrete | — | (707) 689 7980 | Other | Fairfield · Solano County | — | — |
| M D Construction | Michael Joseph Dykes | — | (408) 821 3887 | GC, remodel, ADU | Vacaville · Solano County | — | — |
| M Electric | Singh Maninderpal | shea@m-electric.com | (707) 301 9112 | Electricians | Vacaville · Solano County | — | — |
| M F Maher INC | Malcolm Francis Maher | — | (707) 552 2774 | Other | Vallejo · Solano County | — | — |
| M G Construction | Matthew John Griego | info@mgconstruction.com | (707) 631 6701 | GC, remodel, ADU | Vallejo · Solano County | — | — |