| Luna Verde Landscape INC | Rafael Baltierra | — | (951) 275 2477 | Windows, patio, painters | Mira Loma · Riverside County | — | — |
| Luna's Air Conditioning & Heating | Andrew Ishiah Luna | — | (760) 905 3349 | HVAC | Desert Hot Springs · Riverside County | — | — |
| Luna's General Contractors | Felipe Alejandro Luna Sanchez | — | (951) 220 4085 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Luna's Plumbing INC | Luna Gerardo | — | (951) 364 6179 | Other | Riverside · Riverside County | — | — |
| Lunac Construction INC | Juan Jose Cardoza | — | (760) 716 0908 | GC, remodel, ADU | Winchester · Riverside County | — | — |
| Lunoor Construction INC | Rodolfo David Lucar | — | (714) 851 5750 | GC, remodel, ADU | Temecula · Riverside County | — | — |
| Lusk Plumbing | Lusk Plumbing | — | (760) 922 8486 | GC, remodel, ADU | Blythe · Riverside County | — | — |
| Lutes Air Conditioning Corp | Zea Octavio Perez | — | (951) 496 5263 | HVAC | Norco · Riverside County | — | — |
| Luv R Blinds | Luv R Blinds | — | (951) 736 9650 | Other | Norco · Riverside County | — | — |
| Lux Design | Lux Design | — | (949) 413 7926 | GC, remodel, ADU | Corona · Riverside County | — | — |
| Lux Oasis Pool Construction | Jose Eduardo Rangel Godinez | — | (760) 534 7474 | Pool | Cathedral City · Riverside County | — | — |
| Lux Pools & Spas | Frank Garcia | — | (714) 309 4514 | Pool | Lake Elsinore · Riverside County | — | — |
| Luxe Contractors Corp | J Refujio Murillo Garcia | — | (951) 552 5618 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Luxe Home Remodel INC | Wehbe Osama | info@luxehomeremodel.com | (310) 543 7500 | Electricians | Corona · Riverside County | — | — |
| Luxe Plumbing INC | Stephen Gabriel Torres | — | (909) 534 6258 | Other | Hemet · Riverside County | — | — |
| Luxe Pools | Jonathan Glen Hallett | info@tilestonepools.com | (951) 757 4359 | Pool | Temecula · Riverside County | — | — |
| Luxen Builders | Nicasio Rosendo-Sanchez | — | (951) 376 8834 | GC, remodel, ADU | Corona · Riverside County | — | — |
| Luxor Energy INC | Austin Thomas Seawright | — | (818) 314 3590 | Electricians | Riverside · Riverside County | — | — |
| Luxuriant Landscape INC | Nicholas Aldama | — | (909) 913 2135 | Windows, patio, painters | Beaumont · Riverside County | — | — |
| Luxurious Heating And Air Conditioning INC | Vergara Amando Delgado | — | (949) 813 4805 | HVAC | Corona · Riverside County | — | — |
| Luxury Heating And Air Conditioning | Luxury Heating And Air Conditioning | — | (951) 905 0324 | HVAC | Riverside · Riverside County | — | — |
| Luxury Home Redezigns | Ramon Rodriguez Madrigal | — | (951) 462 9641 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Luxury Landscaping & Design INC | Obebd Emmanuel Lopez Martinez | contact@sansoxygen.com | (760) 600 2741 | Windows, patio, painters | Coachella · Riverside County | — | — |
| Luxury Pool Construction And Design | Juan Erasmo Jr Rodriguez | — | (442) 400 3070 | Pool | La Quinta · Riverside County | — | — |
| Luyan Construction | Li Luyan | — | (626) 766 2821 | GC, remodel, ADU | Temecula · Riverside County | — | — |
| Lv Builders INC | Rudy Axel Flores Obeso | — | (951) 299 8201 | Electricians | Corona · Riverside County | — | — |
| Lynch's Flooring INC | Nathan Alec Lynch | — | (951) 217 4107 | Other | Menifee · Riverside County | — | — |
| Lynch's Tile And Stone INC | Bryan Wayne Lynch | — | (951) 990 6495 | Other | Menifee · Riverside County | — | — |
| Lynk Fabrications | Lynk Fabrications | — | (951) 306 7073 | Other | Cabazon · Riverside County | — | — |
| Lynn Flooring | Lynn Flooring | — | (951) 200 1938 | Other | Winchester · Riverside County | — | — |
| Lynn Llewellyn Electric | Lynn Michael Llewellyn | — | (951) 834 2109 | Electricians | Murrieta · Riverside County | — | — |
| Lyo - Tech INC | Marty Carlos Buck | — | (714) 744 3336 | HVAC | Corona · Riverside County | — | — |
| Lyons Building Company Incorporated | Troy Michael Lyons | — | (951) 606 4155 | GC, remodel, ADU | Canyon Lake · Riverside County | — | — |
| Lyra Builders And Associates | Gerhard Odin Bockness | — | (951) 232 9545 | GC, remodel, ADU | Hemet · Riverside County | — | — |
| Lyve Wyre Electric INC | William Keith Herring | — | (951) 678 6955 | Electricians | Lake Elsinore · Riverside County | — | — |
| M & A Builders INC | Michael James Mireles | — | (760) 702 4867 | GC, remodel, ADU | La Quinta · Riverside County | — | — |
| M & A Const Service | Luis Alberto Munoz | — | (951) 599 5121 | GC, remodel, ADU | Perris · Riverside County | — | — |
| M & C Shotcrete INC | Miguel Angel Gil Valladares | — | (714) 791 8012 | Other | Riverside · Riverside County | — | — |
| M & D Construction | Damian Daniel | — | (714) 272 7434 | GC, remodel, ADU | Corona · Riverside County | — | — |
| M & J Construction INC | Rodriguez Mauricio Najera | — | (714) 350 5596 | GC, remodel, ADU | Moreno Valley · Riverside County | — | — |