| Kz Equipment Services | Kimberly Lynn Zimmer | — | (951) 972 7381 | Other | Temecula · Riverside County | — | — |
| Kz Fence Corp | Zulema Yasmin Rodriguez Segura | — | (951) 537 9793 | Other | Beaumont · Riverside County | — | — |
| L & B Contracting | Laurie George Barnes | — | (951) 627 0139 | GC, remodel, ADU | Nuevo · Riverside County | — | — |
| L & D Solution Cabinets INC | Danny Fernando Durango | — | (909) 272 2732 | Other | Jurupa Valley · Riverside County | — | — |
| L & E Electric | Luis Hernandez Araujo | — | (760) 399 0072 | Electricians | Coachella · Riverside County | — | — |
| L & Hr INC | Haitham Farah Alrabadi | — | (661) 212 8734 | GC, remodel, ADU | Corona · Riverside County | — | — |
| L & L Door And Window | Jon Lance Morgan | — | (760) 345 8089 | GC, remodel, ADU | Palm Desert · Riverside County | — | — |
| L & L Electrical Solutions | Julian Anthony Lujan | — | (909) 994 3902 | Electricians | Jurupa Valley · Riverside County | — | — |
| L & L Restoration Services INC | David Salgado Lopez | — | (619) 581 9416 | GC, remodel, ADU | Menifee · Riverside County | — | — |
| L & M Outdoor Services | Adolfo Adrian Lupian | — | (760) 288 6826 | GC, remodel, ADU | Desert Hot Springs · Riverside County | — | — |
| L & M Services INC | Thomas Scott Meyer | — | (909) 923 1200 | HVAC | Corona · Riverside County | — | — |
| L & M Tile | L & M Tile | — | (760) 774 7833 | Other | Palm Desert · Riverside County | — | — |
| L & S General Construction INC | Alfredo Flores | — | (951) 475 0780 | GC, remodel, ADU | Corona · Riverside County | — | — |
| L A Builder | L A Builder | — | (310) 596 0320 | GC, remodel, ADU | Temecula · Riverside County | — | — |
| L A Concrete | L A Concrete | — | (909) 821 8200 | Other | Riverside · Riverside County | — | — |
| L A S K General Construction INC | Luis Oswaldo Alberty | — | (951) 500 4037 | GC, remodel, ADU | Moreno Valley · Riverside County | — | — |
| L A Snyder Construction | Luke Anthony Snyder | — | (760) 831 8608 | GC, remodel, ADU | La Quinta · Riverside County | — | — |
| L A Tennis Court Resurfacing | L A Tennis Court Resurfacing | — | (951) 347 5125 | Other | Menifee · Riverside County | — | — |
| L And S Painting And Maintenance | Lorenzo Anthony Montoya | — | (714) 889 8724 | Windows, patio, painters | Corona · Riverside County | — | — |
| L B F | L B F | — | (951) 237 9000 | Other | Moreno Valley · Riverside County | — | — |
| L B J Flooring INC | Brent Leslie Johnson | — | (951) 454 3687 | GC, remodel, ADU | Corona · Riverside County | — | — |
| L C R Earthwork Engineering | Jorge Luis Mendoza | — | (951) 934 3231 | Other | Jurupa Valley · Riverside County | — | — |
| L C Stahl | L C Stahl | — | (714) 231 4688 | GC, remodel, ADU | Lake Elsinore · Riverside County | — | — |
| L C Tile | L C Tile | — | (714) 333 8188 | Other | Eastvale · Riverside County | — | — |
| L D F Restoration | Michael Lee Finger | — | (951) 332 2354 | Restoration | Jurupa Valley · Riverside County | — | — |
| L D R Construction Services | Larry David Jr Russell | — | (760) 413 4708 | GC, remodel, ADU | La Quinta · Riverside County | — | — |
| L Diamond Construction | Hernandez Jorge Ledesma | — | (951) 220 2832 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| L E Fence | L E Fence | — | (562) 217 9253 | Other | Riverside · Riverside County | — | — |
| L E S | L E S | — | (760) 340 2809 | Electricians | Palm Desert · Riverside County | — | — |
| L E S I Telecom | David Stanley Smithley | — | (714) 476 4746 | Other | Norco · Riverside County | — | — |
| L G & Z Artistic Tile | Gamboa Hugo | — | (562) 644 5988 | Other | Riverside · Riverside County | — | — |
| L G Holdings INC | Gregory Jon Rhodes | — | (951) 275 1735 | Electricians | Jurupa Valley · Riverside County | — | — |
| L J Ames Construction INC | Lucas John Ames | — | (951) 760 4780 | GC, remodel, ADU | Temecula · Riverside County | — | — |
| L J C Construction | Daniel Jr Luna | — | (951) 415 5215 | GC, remodel, ADU | Corona · Riverside County | — | — |
| L J Designs | L J Designs | — | (760) 345 0680 | GC, remodel, ADU | La Quinta · Riverside County | — | — |
| L M C & Associates | Luis Martin Badillo | — | (909) 856 6070 | GC, remodel, ADU | Murrieta · Riverside County | — | — |
| L M C Air Conditioning & Heating | Roberto Jr Gastelum | — | (661) 343 1048 | HVAC | Indio · Riverside County | — | — |
| L M C Builders | L M C Builders | — | (909) 240 0092 | GC, remodel, ADU | Norco · Riverside County | — | — |
| L M Masonry | L M Masonry | — | (760) 413 4030 | GC, remodel, ADU | Indio · Riverside County | — | — |
| L M Ornamental Metals | L M Ornamental Metals | — | (760) 534 3598 | Other | Indio · Riverside County | — | — |