| L & D Painting | L & D Painting | — | (707) 319 6397 | Windows, patio, painters | Vallejo · Solano County | — | — |
| L & H General Contractors | Michael James Lamphear | — | (707) 580 4790 | GC, remodel, ADU | Vacaville · Solano County | — | — |
| L A S Twins Construction INC | Miguel Angel Salinas | hello@yoursite.com | (707) 689 9917 | GC, remodel, ADU | Vacaville · Solano County | — | — |
| L B Ford Painting INC DBA California Paint Company | Jason Buckley Ford | — | (707) 580 0049 | Windows, patio, painters | Vacaville · Solano County | — | — |
| L C N Enterprises | William Paul Nicora | — | (510) 409 3182 | GC, remodel, ADU | Vacaville · Solano County | — | — |
| L L Construction | Luis Alfonso Lopez Cervantes | — | (707) 718 2546 | GC, remodel, ADU | Vacaville · Solano County | — | — |
| L M F Floors | L M F Floors | — | (707) 803 0330 | Other | Fairfield · Solano County | — | — |
| L Q E Construction | Lance Q Elder | — | (707) 326 4112 | GC, remodel, ADU | Fairfield · Solano County | — | — |
| L R Gomez Construction | Luis Roberto Gomez | — | (707) 693 9000 | Other | Vacaville · Solano County | — | — |
| La Hacienda Stucco | La Hacienda Stucco | — | (707) 365 2118 | Other | Vacaville · Solano County | — | — |
| Lac General Contractor INC | Gerardo Lopez | laconstruction707@gmail.com | (530) 760 7161 | GC, remodel, ADU | Dixon · Solano County | — | — |
| Lafave Glass_company | Lafave Glass_company | info@lafaveglass.com | (707) 300 6465 | Windows, patio, painters | Vallejo · Solano County | — | — |
| Lago Stucco & Masonry | Lago Stucco & Masonry | — | (707) 974 9260 | Other | Vacaville · Solano County | — | — |
| Laketech INC | Eli Peter Kersh | — | (510) 560 5651 | Other | Benicia · Solano County | — | — |
| Lalo's House & Deck Masters INC | Phillip Ross Gray | — | (415) 342 9887 | GC, remodel, ADU | Vallejo · Solano County | — | — |
| Lamont Construction | Jonathan Hale Lamont | — | (707) 628 2727 | GC, remodel, ADU | Dixon · Solano County | — | — |
| Landin Landscape Solutions INC | Rodolfo De Jesus Landin | — | (415) 518 2206 | Windows, patio, painters | Vallejo · Solano County | — | — |
| Landscape And Paver Works INC | Eduard Ernst Gerber | — | (707) 628 3150 | Windows, patio, painters | Vacaville · Solano County | — | — |
| Lanusa Pools & Landscape INC | Leobardo Gallardo Lanuza | — | (707) 207 1652 | Windows, patio, painters | Fairfield · Solano County | — | — |
| Lara Builders INC | Ciro Perez Castro | — | (707) 689 4403 | GC, remodel, ADU | Vacaville · Solano County | — | — |
| Larson Construction Co | Norval Duane Larson | — | (707) 256 2655 | GC, remodel, ADU | Benicia · Solano County | — | — |
| Lathrop Construction Associates INC | Anthony Stephen Reed | — | (707) 746 8000 | GC, remodel, ADU | Benicia · Solano County | — | — |
| Law Steel | Law Steel | — | (707) 372 1478 | Other | Fairfield · Solano County | — | — |
| Lawnscape Solutions LLC | Kevin Daniel Nunn | — | (707) 501 8241 | Windows, patio, painters | Vacaville · Solano County | — | — |
| Lay Rite Paving | Daniel Nathan Stanko | — | (408) 607 8099 | Other | Dixon · Solano County | — | — |
| Le Bleu's Painting | Norman Aime Le Bleu | — | (707) 678 6964 | Windows, patio, painters | Dixon · Solano County | — | — |
| Leathem & Co INC | Leathem & Co INC | — | (858) 792-0861 | Pool | Solana Beach · Solano County | — | — |
| Lebco Construction INC | Carson Anthony Leber | — | (707) 678 2109 | GC, remodel, ADU | Dixon · Solano County | — | — |
| Lee's Sheet Metal Heating & Cooling | Lee Madison Thomas | — | (707) 642 7771 | HVAC | Vallejo · Solano County | — | — |
| Lee-wood Construction INC | William Leigh-Wood | danny@leewoodconstruction.com | (707) 332 1971 | GC, remodel, ADU | Vallejo · Solano County | — | — |
| Legacy Blinds | Legacy Blinds | — | (707) 580 3962 | Other | Fairfield · Solano County | — | — |
| Legacy Electrical Service & Construction | Christopher Ryan Jones | — | (707) 474 4800 | Electricians | Vacaville · Solano County | — | — |
| Legacy Innovative Builders INC | David Wynn Roberts | — | (707) 673 3944 | GC, remodel, ADU | Vacaville · Solano County | — | — |
| Legacy Modular Buildings INC | Mario Nunez Camacho | — | (707) 479 3400 | GC, remodel, ADU | Vacaville · Solano County | — | — |
| Legacy Pools INC | Emilio Efren Medrano Sanchez | — | (707) 685 4585 | Pool | Vacaville · Solano County | — | — |
| Legend Window And Glass Door | Juan Antonio Cruz | — | (707) 626 0526 | Windows, patio, painters | Dixon · Solano County | — | — |
| Lemus HVAC | Lemus HVAC | — | (707) 592 8040 | HVAC | Vacaville · Solano County | — | — |
| Leo And Mark Nelson General Contractors | Theron Angus Andersen | — | (530) 409 2092 | GC, remodel, ADU | Dixon · Solano County | — | — |
| Leon Air Systems | Leon Air Systems | — | (707) 580 3737 | HVAC | Fairfield · Solano County | — | — |
| Leon Construction INC | Jorge Alberto Chavez Leon | — | (707) 416 5104 | GC, remodel, ADU | Vacaville · Solano County | — | — |