| Lavallee Welding | Cory John Lavallee | — | (760) 855 5146 | Other | Murrieta · Riverside County | — | — |
| Lavang Controls Corp | Minh Quang Tran | — | (714) 914 3781 | HVAC | Riverside · Riverside County | — | — |
| Lavelle Pierson Holland Jr | Lavelle Pierson Holland Jr | — | (951) 345 3104 | Other | Temecula · Riverside County | — | — |
| Lavin Home Remodeling | Lavin Home Remodeling | — | (951) 233 1522 | GC, remodel, ADU | Lake Elsinore · Riverside County | — | — |
| Lawliss Construction | Ryan James Lawliss | — | (760) 861 8488 | GC, remodel, ADU | Palm Desert · Riverside County | — | — |
| Lawn Enforcement Landscaping | Lawn Enforcement Landscaping | — | (213) 521 0014 | Windows, patio, painters | Coachella · Riverside County | — | — |
| Lawrence R Woolworth | Lawrence R Woolworth | — | (760) 567 8090 | GC, remodel, ADU | Palm Desert · Riverside County | — | — |
| Lawson Building & Design | Lawson Building & Design | — | (951) 207 6401 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Lawson Concrete INC | Willard Don Lawson | — | (760) 342 4400 | Other | Palm Desert · Riverside County | — | — |
| Lawson Select Construction | Scott Lynn Lawson | — | (442) 866 5771 | GC, remodel, ADU | Coachella · Riverside County | — | — |
| Lay It Down Floors | Mondragon Victor Estrada | — | (949) 554 7060 | Other | Perris · Riverside County | — | — |
| Layne Construction INC | Gary Delano Dellegatte | l.layne@mchsi.com | (951) 751 6739 | GC, remodel, ADU | Banning · Riverside County | — | — |
| Lazaro Alexander Padilla | Lazaro Alexander Padilla | — | (760) 808 3542 | Windows, patio, painters | Thousand Palms · Riverside County | — | — |
| Lazaro Canseco's Painting | Lazaro Canseco's Painting | — | (760) 672 6425 | Windows, patio, painters | Murrieta · Riverside County | — | — |
| Lb Precision Plumbing | Lb Precision Plumbing | — | (951) 333 0924 | Other | Jurupa Valley · Riverside County | — | — |
| Lb Structural INC | Luis Brian Bentivengo | support@lbstructural.com | (951) 445 9378 | GC, remodel, ADU | Temecula · Riverside County | — | — |
| Lbd 1 Construction Corp | John Van Phan | — | (657) 377 7750 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Lc Custom & Special Painting Finishes | Lucas Damian Chena Bertora | — | (949) 547 3650 | Windows, patio, painters | Corona · Riverside County | — | — |
| Lc Custom Painting | Lc Custom Painting | — | (760) 574 8819 | Windows, patio, painters | Indio · Riverside County | — | — |
| Lc Drywall INC | Luis Armando Cardenas | — | (714) 393 6651 | Other | Riverside · Riverside County | — | — |
| Lc Masonary | Lucas Leandro Salvador | — | (951) 662 3173 | Other | Perris · Riverside County | — | — |
| Lc Quality Heating & Air INC | Lorenzo Julio Martinez Salas | — | (714) 309 7320 | HVAC | Corona · Riverside County | — | — |
| Lce Telecom INC | Samuel Isaac Quilchez | — | (714) 397 8961 | HVAC | Riverside · Riverside County | — | — |
| Ld Electrical Services | Joseph Steven Espino | liam@ldelectricalservices.com | (951) 740 2995 | Electricians | Murrieta · Riverside County | — | — |
| Ldi Mechanical INC | Reynaldo Legaspi Almazar | — | (951) 340 9685 | HVAC | Corona · Riverside County | — | — |
| Le Flooring & Carpet INC | Ramon Emmanuel Chavez Jacobo | — | (909) 503 5178 | Other | Riverside · Riverside County | — | — |
| Le'scape Landscaping | Le'scape Landscaping | — | (951) 254 7644 | Windows, patio, painters | Murrieta · Riverside County | — | — |
| Leader Landscape & Irrigation | Leader Landscape & Irrigation | — | (909) 240 6100 | Windows, patio, painters | Temecula · Riverside County | — | — |
| Leading Edge Air Conditioning | Leading Edge Air Conditioning | — | (760) 668 2041 | HVAC | Cathedral City · Riverside County | — | — |
| Leafwise Landscape LLC | Jovani Lemus | — | (951) 214 3839 | Windows, patio, painters | Moreno Valley · Riverside County | — | — |
| Leah Langefeld Painting | Leah Langefeld Painting | — | (781) 606 2101 | Windows, patio, painters | Cathedral City · Riverside County | — | — |
| Leak Doctor | Leak Doctor | — | (951) 310 8520 | Other | Norco · Riverside County | — | — |
| Leak Pro Plumbing INC | Christian William Barlows | — | (951) 481 8337 | Other | Canyon Lake · Riverside County | — | — |
| Leak Specialties LLC | Daniel Mendiola Sr Munoz | — | (760) 564 9440 | Other | Coachella · Riverside County | — | — |
| Leal Concrete Construction INC | Carlos Antonio Leal | — | (760) 275 1911 | Other | Cathedral City · Riverside County | — | — |
| Leather Home Gallery INC | Jesse Jr Cervantes | — | (951) 351 9911 | Other | Riverside · Riverside County | — | — |
| Leblanc Backflow Service LLC | Peter Jerome Leblanc | — | (951) 313 7989 | Other | Winchester · Riverside County | — | — |
| Ledesert Construction INC | Robert Mark Ledesma | — | (760) 619 6216 | GC, remodel, ADU | Indio · Riverside County | — | — |
| Lee Construction | Denzil Olen Lee | — | (951) 805 3250 | GC, remodel, ADU | Murrieta · Riverside County | — | — |
| Lee Electric | Lee Bobby | — | (760) 880 1464 | Electricians | La Quinta · Riverside County | — | — |