| Lighthouse Plumbing | Lighthouse Plumbing | — | (951) 520 6911 | Other | Murrieta · Riverside County | — | — |
| Lighting Electric INC | Rivera Roberto | — | (909) 470 6470 | Electricians | Menifee · Riverside County | — | — |
| Lightman Electric | Monroy Mario | — | (951) 992 7663 | Electricians | Moreno Valley · Riverside County | — | — |
| Lightman Electric INC | Joshua William Lightman | — | (714) 317 9554 | Electricians | Canyon Lake · Riverside County | — | — |
| Lightning Air Conditioning And Heating LLC | Jorge Luis Avila Avalos | — | (760) 625 3236 | HVAC | Indio · Riverside County | — | — |
| Lightning Construction INC | Christian Navarrete | — | (909) 681 7110 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Lightning Electric | Jose Santos Bonilla | — | (949) 547 8266 | Electricians | Lake Elsinore · Riverside County | — | — |
| Lightning Electric Unlimited | Thomas Jr Schmersal | — | (760) 908 7412 | Electricians | Quail Valley · Riverside County | — | — |
| Lights On Electric INC | Jason Todd Martin | — | (951) 734 8308 | Electricians | Corona · Riverside County | — | — |
| Lightupenergy LLC | Cristian Perez | — | (951) 295 3437 | Electricians | Riverside · Riverside County | — | — |
| Lightvision Communications | Lightvision Communications | — | (951) 340 1922 | Other | Corona · Riverside County | — | — |
| Lightwave | Richard Glenn Jr Romback | — | (951) 698 8612 | Other | Murrieta · Riverside County | — | — |
| Lightwave Connection INC | Victor Manuel Garcia Muniz | — | (951) 442 5348 | Other | Perris · Riverside County | — | — |
| Limitless Window And Door | Limitless Window And Door | limitlesswindowdoor@gmail.com | (760) 275 1151 | GC, remodel, ADU | Indio · Riverside County | — | — |
| Linardos Enterprises INC DBA L E I General Contractor | Pete John Linardos | — | (951) 314 6721 | GC, remodel, ADU | Corona · Riverside County | — | — |
| Linda Williamson | Linda Williamson | — | (760) 250 1506 | GC, remodel, ADU | Palm Springs · Riverside County | — | — |
| Lindly's Pools Of California INC | James Daniel Lindly | — | (760) 343 0600 | Pool | La Quinta · Riverside County | — | — |
| Lindow Construction | Robert Scott Lindow | scott@lindowconstruction.com | (951) 764 1161 | GC, remodel, ADU | Temecula · Riverside County | — | — |
| Lindseth Construction INC | Edward Arnold Lindseth | — | (951) 427 1522 | GC, remodel, ADU | Norco · Riverside County | — | — |
| Line Works Construction INC | Jesus Murguia Adame | — | (949) 535 3375 | Electricians | Corona · Riverside County | — | — |
| Linea Construction Group | Puga Cesar Paniagua | — | (760) 972 7515 | GC, remodel, ADU | Indio · Riverside County | — | — |
| Lineside Electric | Eric Anastos Michels | — | (714) 955 7473 | Electricians | Corona · Riverside County | — | — |
| Linksman Air LLC | Richard Jr Leon | — | (760) 883 8810 | HVAC | La Quinta · Riverside County | — | — |
| Linn Construction | George Chuan Linn | info@linn-construction.com | (909) 753 3412 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Lion E&l INC | David Hernandez Diaz | — | (760) 972 4033 | Electricians | Indio · Riverside County | — | — |
| Lion Tree Service | Ramirez Flores Eduardo | — | (951) 580 0684 | Tree | Perris · Riverside County | — | — |
| Lioness Electric INC | Edgardo Torres | jackiet@lionesselectric.com | (760) 688 7408 | Electricians | Palm Desert · Riverside County | — | — |
| Lions Den General Constrution INC | Jaime Rojas | — | (951) 813 8897 | GC, remodel, ADU | Murrieta · Riverside County | — | — |
| Lippert Construction INC | David Richard Lippert | info@lippertconstruction.com | (760) 863 5700 | GC, remodel, ADU | La Quinta · Riverside County | — | — |
| Liquid Renovations Pool Remodeling | Wes Tucker Kurz | — | (951) 805 5241 | Pool | Lake Elsinore · Riverside County | — | — |
| Lira's Prestige Companies Incorporated | James Albert Ii Lira | — | (909) 383 0011 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Lisardo Construction INC | Joseph Salgado Lisardo | — | (951) 735 9958 | GC, remodel, ADU | Corona · Riverside County | — | — |
| Liscio Development INC | Liscio Wayne | — | (951) 683 2970 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Lister Electric | Jesse Edward Lister | jesse@listerelectric.com | (951) 691 9667 | Electricians | Wildomar · Riverside County | — | — |
| Little Electric | Little Joshua | — | (626) 372 4148 | Electricians | Murrieta · Riverside County | — | — |
| Little Star Landscape | Pedro Osmin Gonzalez | — | (714) 240 1370 | Windows, patio, painters | Lake Elsinore · Riverside County | — | — |
| Live Wire Electric & Lighting LLC | Dante Gabriel Nunez | — | (760) 333 5784 | Electricians | Palm Springs · Riverside County | — | — |
| Livewell Restoration LLC | Jonathan Wade Littrell | info@livewellrestoration.com | (951) 453 5068 | HVAC | Corona · Riverside County | — | — |
| Livewire Solutions INC | Badawi Basim | — | (951) 217 5264 | Electricians | Corona · Riverside County | — | — |
| Living Stream Construction | Li Jingxin | — | (626) 676 7116 | GC, remodel, ADU | Eastvale · Riverside County | — | — |