| Lb Roof Removal | Lb Roof Removal | — | (925) 628 4620 | Other roofers | Knightsen · Contra Costa County | — | — |
| Lc Home Builder INC | Miu Sze Cheung | — | (415) 812 5383 | Electricians | Brentwood · Contra Costa County | — | — |
| Lci Langsdale Construction INC | Joshua Langsdale | — | (925) 691 6563 | GC, remodel, ADU | Martinez · Contra Costa County | — | — |
| Lcx Energy INC | Portugal Leonardo | — | (510) 393 4038 | Electricians | Concord · Contra Costa County | — | — |
| Le Professional Landscaping | Le Professional Landscaping | — | (925) 779 0724 | Windows, patio, painters | Antioch · Contra Costa County | — | — |
| Leading Edge Coating's | Leading Edge Coating's | — | (925) 477 7316 | Windows, patio, painters | Brentwood · Contra Costa County | — | — |
| Leapfrog Plumbing | Maurice Bernard Williams | — | (925) 933 1245 | Other | Walnut Creek · Contra Costa County | — | — |
| Lebec INC | Robyn Leigh Brockman | — | (925) 634 4177 | GC, remodel, ADU | Brentwood · Contra Costa County | — | — |
| Leck Soungpanya | Leck Soungpanya | — | (510) 507 0459 | GC, remodel, ADU | El Sobrante · Contra Costa County | — | — |
| Ledezma Landscaping LLC | Gonzalez Jorge Ledezma | ledezma.landscaping270@gmail.com | (619) 791-5276 | Windows, patio, painters | Antioch · Contra Costa County | — | — |
| Lee's Construction | Robert Allen Lee | — | (510) 830 9612 | GC, remodel, ADU | El Sobrante · Contra Costa County | — | — |
| Lee's Painting | Lee's Painting | — | (650) 430 4808 | Windows, patio, painters | Hercules · Contra Costa County | — | — |
| Leegwater Building & Development INC | Steven Bruce Leegwater | — | (925) 250 5040 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Leet Construction Corp | Amirzadeh Asl Mehran | — | (415) 881 0841 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Legacy Builders INC | Thomas Albert Seeno | — | (925) 671 7711 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Legacy Designs Construction INC | Robert Francis Cate | — | (925) 502 8453 | GC, remodel, ADU | Pleasant Hill · Contra Costa County | — | — |
| Legacy Framers INC | David James Gutridge | — | (925) 427 1011 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Legacy Hardwood | Legacy Hardwood | — | (925) 838 1311 | Other | Danville · Contra Costa County | — | — |
| Legacy Kitchens & Baths | Legacy Kitchens & Baths | — | (925) 766 8418 | GC, remodel, ADU | Martinez · Contra Costa County | — | — |
| Legacy Mechanical & Energy Services INC | Christopher Charles Lofaso | — | (925) 820 6938 | HVAC | San Ramon · Contra Costa County | — | — |
| Legacy Property Management | Legacy Property Management | info@rentlegacy.com | (877) 603-9696 | Property managers | Concord · Contra Costa County | — | — |
| Legacy Renovations INC | David James Gutridge | — | (925) 852 4814 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Legion LLC | Daxiong He | — | (925) 222 5656 | Other | San Ramon · Contra Costa County | — | — |
| Leichter's Floor Covering INC | Samuel Sherman Leichter | — | (925) 360 0267 | Other | Clayton · Contra Costa County | — | — |
| Leif Sallstrom | Leif Sallstrom | — | (925) 719 3301 | GC, remodel, ADU | Alamo · Contra Costa County | — | — |
| Leleu Construction & Remodeling | Leleu David | — | (925) 383 6302 | GC, remodel, ADU | Pleasant Hill · Contra Costa County | — | — |
| Lema Construction INC | Leszek Masluch | — | (650) 346 4523 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Lema Windows And Doors Replacement | Lema Windows And Doors Replacement | — | (866) 767-5362 | Windows, patio, painters | Concord · Contra Costa County | — | — |
| Lencioni Painting | Lencioni Painting | — | (925) 752 5926 | Windows, patio, painters | Brentwood · Contra Costa County | — | — |
| Lenex Plumbing | Lenex Plumbing | — | (925) 759 4858 | Other | Brentwood · Contra Costa County | — | — |
| Lenuxs LLC | Edgar Javier Contreras Madriz | — | (341) 240 6040 | HVAC | San Pablo · Contra Costa County | — | — |
| Leo's Roofing Co | Jose Mauricio Navarrete | — | (415) 786 0121 | Other roofers | Pinole · Contra Costa County | — | — |
| Leon & Son Landscaping Care INC | De Leon Elisa Velasco | — | (925) 526 4625 | Windows, patio, painters | Brentwood · Contra Costa County | — | — |
| Leon Brothers Roofing Company INC | Arcenio Daniel Leon Anguiano | — | (510) 935 2316 | Other roofers | Richmond · Contra Costa County | — | — |
| Leon Tile Solutions | Leon Tile Solutions | — | (925) 250 2741 | Other | Martinez · Contra Costa County | — | — |
| Leonardo Painting | Leonardo Painting | — | (925) 595 7186 | Windows, patio, painters | Concord · Contra Costa County | — | — |
| Lerma's 5A Construction | Lerma Niebla Abraham | — | (510) 224 0624 | GC, remodel, ADU | Richmond · Contra Costa County | — | — |
| Lesco | Leslie William Jr Merrill | — | (925) 433 1428 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Lescure Company INC | Michael James Lescure | — | (925) 283 2528 | HVAC | Concord · Contra Costa County | — | — |
| Lester R Nickleberry | Lester R Nickleberry | — | (510) 919 0340 | GC, remodel, ADU | Martinez · Contra Costa County | — | — |