| Louies Plumbing Heating & Air | Louies Plumbing Heating & Air | — | (951) 691 0711 | HVAC | Murrieta · Riverside County | — | — |
| Louis Darnell Woodward Jr | Louis Darnell Woodward Jr | — | (951) 354 2262 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Louis R Murdica Construction | Louis Ralph Murdica | — | (760) 275 6261 | GC, remodel, ADU | Sky Valley · Riverside County | — | — |
| Louis Sessler Construction | Louis Troy Sessler | — | (949) 701 2200 | Electricians | Lake Elsinore · Riverside County | — | — |
| Louis Vogel Iv | Louis Vogel Iv | — | (714) 334 7001 | Electricians | Riverside · Riverside County | — | — |
| Louks Flooring Solutions | Louks Flooring Solutions | — | (951) 350 5802 | Other | Moreno Valley · Riverside County | — | — |
| Loutsenhizer Construction INC | Joseph Edwin Loutsenhizer | — | (760) 200 8884 | GC, remodel, ADU | Palm Desert · Riverside County | — | — |
| Love's Plumbing & Drains | Love's Plumbing & Drains | — | (951) 595 0215 | Other | Temecula · Riverside County | — | — |
| Lovell Electric | Ronald Dean Lovell | — | (714) 267 4905 | Electricians | Corona · Riverside County | — | — |
| Lovolt Solutions | Lovolt Solutions | — | (951) 821 6147 | Other | Winchester · Riverside County | — | — |
| Low Cost Heating And Air Conditioning INC | Alejandro Antonio Beltran | — | (951) 696 2700 | HVAC | Murrieta · Riverside County | — | — |
| Low Desert Heating & Cooling Refrigeration INC | Fernando Contreras | — | (760) 698 0518 | HVAC | Desert Hot Springs · Riverside County | — | — |
| Low Desert Landscape Group INC | Mark Anthony Uribe | — | (760) 777 3475 | Windows, patio, painters | Indio · Riverside County | — | — |
| Low Desert Lawn Care | Low Desert Lawn Care | — | (760) 272 6998 | Windows, patio, painters | Cathedral City · Riverside County | — | — |
| Low Price And Unique Builders | Low Price And Unique Builders | — | (951) 686 0852 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Lowe Co INC | Steven A Lowe | — | (714) 713 7001 | GC, remodel, ADU | Eastvale · Riverside County | — | — |
| Lowe Electrical Contractors | Patrick Kyle Lowe | — | (951) 970 0383 | Electricians | Murrieta · Riverside County | — | — |
| Lowe General Construction INC | Kevin Scott Lowe | — | (951) 498 8101 | GC, remodel, ADU | Canyon Lake · Riverside County | — | — |
| Loyalty Roofing INC | Rafael Valdivia | — | (951) 855 9916 | Other roofers | Norco · Riverside County | — | — |
| Lozada Trenching INC | Frank Mario Lozada | — | (951) 598 8074 | Other | Riverside · Riverside County | — | — |
| Lozano Plumbing Services Incorporated DBA Plumbing Master | Lozano Andrew | — | (951) 683 4840 | Other | Riverside · Riverside County | — | — |
| Lozano's Creative Cabinets | Rivera Villarreal Lucia | — | (909) 223 3208 | Other | Riverside · Riverside County | — | — |
| Lozano's Lath And Plaster | Victor Manuel Jr Lozano | — | (760) 449 7181 | Other | Indio · Riverside County | — | — |
| Lozano's Painting INC | Jasmine Lucia Lozano | — | (760) 698 1150 | Windows, patio, painters | Cathedral City · Riverside County | — | — |
| Lozano's Plumbing | Lozano's Plumbing | — | (714) 760 1866 | Other | Corona · Riverside County | — | — |
| Lozoya Custom Painting | Carlos Eliel Lozoya-urias | — | (760) 391 7485 | Windows, patio, painters | Coachella · Riverside County | — | — |
| Lpz Electric INC | Arce Mucio Lopez | — | (951) 451 8548 | Electricians | San Jacinto · Riverside County | — | — |
| Lpz Plumbing | Lpz Plumbing | — | (951) 544 8055 | Other | Moreno Valley · Riverside County | — | — |
| Lpz Roofing Corp | Abraham Lopez | — | (323) 915 5562 | Other roofers | Perris · Riverside County | — | — |
| Lq Construction INC | Luis Alberto Quiroz Alegre | — | (760) 219 4709 | GC, remodel, ADU | Palm Springs · Riverside County | — | — |
| Lr Pools & Spas | Lr Pools & Spas | — | (760) 910 8043 | Pool | Indio · Riverside County | — | — |
| Lrb Solutions INC | Lawrence Jean Amado | — | (949) 813 9692 | GC, remodel, ADU | Menifee · Riverside County | — | — |
| Lre Air Conditioning & Refrigeration INC | Hao Thi Tran | — | (951) 591 2398 | HVAC | Perris · Riverside County | — | — |
| Ls Tile | Ls Tile | — | (760) 601 5411 | Other | Desert Hot Springs · Riverside County | — | — |
| Lse Fire Protection INC | Moreno Eduardo | — | (951) 274 0734 | Other | Menifee · Riverside County | — | — |
| Lshi Construction INC | Lin Cui | — | (626) 642 4025 | GC, remodel, ADU | Jurupa Valley · Riverside County | — | — |
| Lsj Painting Co | Luis Sarabia Jasso | — | (951) 333 0425 | Windows, patio, painters | Riverside · Riverside County | — | — |
| Lt Concrete | Lt Concrete | — | (562) 219 6493 | Other | Riverside · Riverside County | — | — |
| Lt Construction | Torres Luis | — | (760) 485 7587 | GC, remodel, ADU | Indio · Riverside County | — | — |
| Lt Construction & Development INC | Tuan Anh Ly | — | (949) 468 7968 | GC, remodel, ADU | Corona · Riverside County | — | — |