| Living Water Landscaping | Living Water Landscaping | livingwater77@msn.com | (951) 719-4590 | Windows, patio, painters | Menifee · Riverside County | — | — |
| Living Water Pool Care INC | Lorenzo Jr Valdez | — | (760) 641 6238 | Pool | Cathedral City · Riverside County | — | — |
| Living Water Pools And Spa Construction Services INC | Daisy Donella Melgar | — | (951) 292 1396 | Pool | Hemet · Riverside County | — | — |
| Lj - 21 Construction & Design Studio INC | Luis Enrique Jaramillo | — | (619) 817 7787 | GC, remodel, ADU | Murrieta · Riverside County | — | — |
| Lj-21 Construction & Design Studio | Luis Enrique Jaramillo | — | (619) 817 7787 | GC, remodel, ADU | Murrieta · Riverside County | — | — |
| Ljubomir Vujicic | Ljubomir Vujicic | — | (909) 435 1404 | GC, remodel, ADU | Winchester · Riverside County | — | — |
| Llamas General Building Contractor LLC | Sergio Yarin Jr Llamas | — | (562) 324 7875 | GC, remodel, ADU | Moreno Valley · Riverside County | — | — |
| Lloyd Gene Arthur | Lloyd Gene Arthur | — | (714) 883 1708 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Lloyd Mac Electric | Wray Allen Mcdaniel | — | (951) 813 9233 | Electricians | Lake Elsinore · Riverside County | — | — |
| Lloyd Pest & Termite Control | Lloyd Pest & Termite Control | — | (951) 600-1398 | Pest, tile roofs | Riverside · Riverside County | — | — |
| Lm Residential Rehab Services | Yesenia Castaneda | — | (951) 295 3216 | GC, remodel, ADU | Perris · Riverside County | — | — |
| Lm-70 Company | Leopoldo Mendoza Monreal | — | (951) 533 3322 | Other | Jurupa Valley · Riverside County | — | — |
| Lml Masonry | Lml Masonry | — | (951) 662 7587 | Other | Jurupa Valley · Riverside County | — | — |
| Lms Reinforcing Steel Usa LP | Richard Edward Bagley | — | (951) 307 0972 | Other | Corona · Riverside County | — | — |
| Ln Construction | Luis Nava | — | (760) 619 5431 | GC, remodel, ADU | Indio · Riverside County | — | — |
| Lo Cal Electric | Ciro Margarito Rocha | — | (760) 574 6482 | Electricians | La Quinta · Riverside County | — | — |
| Loaisiga General Construction INC | Rogelio Antonio Loaisiga | — | (951) 847 4697 | GC, remodel, ADU | Eastvale · Riverside County | — | — |
| Loaiza Construction | Jose Manuel Loaiza | — | (760) 497 1846 | GC, remodel, ADU | Perris · Riverside County | — | — |
| Loc Building Company INC | Gerardo Elias-Gutierrez | — | (714) 235 0317 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Local Air Conditioning & Heating | Local Air Conditioning & Heating | — | (760) 660 2001 | HVAC | Desert Hot Springs · Riverside County | — | — |
| Local Comfort | Local Comfort | — | (760) 638 6817 | HVAC | Hemet · Riverside County | — | — |
| Locc Painting | Locc Painting | — | (951) 392 0350 | Windows, patio, painters | Banning · Riverside County | — | — |
| Lock And Alert Systems | Lock And Alert Systems | — | (951) 294 4321 | Electricians | Temecula · Riverside County | — | — |
| Locken Construction Co | Andy Henry Locken | — | (760) 534 5303 | GC, remodel, ADU | Bermuda Dunes · Riverside County | — | — |
| Locks Around The Clock INC | Sean Martin Cahill | — | (760) 625 7184 | Other | Palm Desert · Riverside County | — | — |
| Logan Jair Gaitan | Logan Jair Gaitan | — | (951) 394 6015 | Windows, patio, painters | Moreno Valley · Riverside County | — | — |
| Logan Landscape INC | Nicholas Conrad Logan | — | (760) 578 1780 | Windows, patio, painters | La Quinta · Riverside County | — | — |
| Logan Mechanical INC | Larry Kent Hauptman | — | (951) 737 7066 | HVAC | Norco · Riverside County | — | — |
| Logical Landscaping | Brent Joseph Zahn | — | (951) 394 4114 | Windows, patio, painters | Temecula · Riverside County | — | — |
| Logo's Sanitation Systems | Jorge Alberto Lopez Gomez | — | (951) 515 4450 | Other | Perris · Riverside County | — | — |
| Logue's Flooring | Logue's Flooring | — | (951) 751 4946 | Other | Corona · Riverside County | — | — |
| Lolesio Landscape Construction | Otoota Edmond Lolesio | office@lolesiolandscape.com | (951) 200 0324 | Windows, patio, painters | San Jacinto · Riverside County | — | — |
| Loma Designs Concrete Work | Rafael Alberto Lopez Martinez | — | (951) 907 3734 | Other | Riverside · Riverside County | — | — |
| Loma Vista Companies INC | Jairo Munoz | — | (951) 416 1042 | GC, remodel, ADU | Moreno Valley · Riverside County | — | — |
| Lomeli & Sons Painting | Victor Lomeli | — | (951) 442 5821 | Windows, patio, painters | Corona · Riverside County | — | — |
| Lomeli Backhoe Service INC | Lomeli Javier | — | (951) 271 0208 | Other | Eastvale · Riverside County | — | — |
| Lomeli's Roofing | Carrillo Jtrinidad Lomeli | — | (909) 235 0987 | Other roofers | San Jacinto · Riverside County | — | — |
| Lomeli's Tile | Lomeli's Tile | — | (760) 899 5924 | Other | Coachella · Riverside County | — | — |
| Lomeri Construction | Lomeli Candelario | — | (323) 695 1911 | GC, remodel, ADU | Sun City · Riverside County | — | — |
| Lone Star Electric | Estrada Ruben | — | (951) 551 2319 | Electricians | Aguanga · Riverside County | — | — |