| Kozlik Construction | John F Kozlik | — | (951) 659 2313 | GC, remodel, ADU | Mountain Center · Riverside County | — | — |
| Kp Steel Manufacturing INC | Brian Sanguk Jun | — | (909) 518 0981 | GC, remodel, ADU | Eastvale · Riverside County | — | — |
| Kps Alarms | Kps Alarms | — | (800) 457-7252 | Alarm and generators | Riverside · Riverside County | — | — |
| Kps Engineering Construction | Kaushal Girish Talati | — | (951) 515 3922 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Kramer Tile | Kramer Tile | — | (760) 799 2288 | Other | Desert Hot Springs · Riverside County | — | — |
| Krative Tile Designs | Rendon Remigio Urbano | — | (463) 203 2885 | Other | Riverside · Riverside County | — | — |
| Krem General Construction | Martinez Rolando | — | (951) 456 8826 | GC, remodel, ADU | Moreno Valley · Riverside County | — | — |
| Kretschmar & Smith INC | Jimmy Charles Smith | — | (951) 361 1405 | Other | Riverside · Riverside County | — | — |
| Kretschmar Masonry | Kretschmar Masonry | — | (951) 361 1405 | Other | Riverside · Riverside County | — | — |
| Kretsinger Plumbing INC | Jacqueline Lee Kretsinger | — | (951) 313 0334 | Other | Idyllwild · Riverside County | — | — |
| Krgs Roofing INC | Flores Roberto | — | (714) 715 2313 | Other roofers | Beaumont · Riverside County | — | — |
| Krista Alana Bowman | Krista Alana Bowman | — | (303) 775 3959 | Other | Cathedral City · Riverside County | — | — |
| Krj Construction | Kyle Richard Jensen | — | (951) 852 5031 | GC, remodel, ADU | Temecula · Riverside County | — | — |
| Krm Audio Visual | Krm Audio Visual | — | (949) 554 5485 | Electricians | Menifee · Riverside County | — | — |
| Kromas Painting INC | Veronica B Venegas | — | (760) 777 3543 | Windows, patio, painters | Desert Hot Springs · Riverside County | — | — |
| Krome Jon | Krome Jon | — | (760) 272 0953 | Electricians | Palm Desert · Riverside County | — | — |
| Ks Tile | Ks Tile | — | (951) 264 6664 | Other | Corona · Riverside County | — | — |
| Kser Finish Carpentry | Kser Finish Carpentry | — | (951) 743 3626 | Other | Riverside · Riverside County | — | — |
| Ksi Communications INC | Christian Gonzalez | — | (323) 633 6248 | Other | Jurupa Valley · Riverside County | — | — |
| Ksk Builders | Kalvin Peuker Brand Klein | impallari@gmail.com | (951) 231 3391 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Ksp Construction | Kristin Suzanne Pesaniello | kspkkacprowicz@gmail.com | (951) 400 2409 | GC, remodel, ADU | Norco · Riverside County | — | — |
| Ktb Construction Services LLC | Kevin Thomas Baugh | — | (951) 587 1724 | Other | Winchester · Riverside County | — | — |
| Kuhlman Construction | Dana Allan Kuhlman | — | (714) 356 5738 | GC, remodel, ADU | Corona · Riverside County | — | — |
| Kun Wang | Kun Wang | — | (951) 709 6050 | GC, remodel, ADU | Temecula · Riverside County | — | — |
| Kunney Kato Electric | Kato Kunney | — | (760) 275 8571 | Electricians | Cathedral City · Riverside County | — | — |
| Kurt Alan Young | Kurt Alan Young | — | (951) 772 2437 | Other | Menifee · Riverside County | — | — |
| Kurt Hoffman | Kurt Hoffman | — | (760) 345 3894 | Other | La Quinta · Riverside County | — | — |
| Kurt Musick Painting | Kurt Musick Painting | — | (951) 719 0544 | Windows, patio, painters | Murrieta · Riverside County | — | — |
| Kustom Tech INC | Ziad Mohamed Erekat | — | (951) 257 7900 | Other | Temecula · Riverside County | — | — |
| Kva Electric | Fabian Aurel Tira | — | (714) 737 8499 | Electricians | Riverside · Riverside County | — | — |
| Kvs Landscape | Scott Thomas Symonds | info@kvslandscape.com | (951) 395 6045 | Windows, patio, painters | Winchester · Riverside County | — | — |
| Kw Concrete Coring & Cutting INC | Kyle Wayne Fiechter | — | (951) 800 5926 | Other | Riverside · Riverside County | — | — |
| Kw Plumbing | Kw Plumbing | — | (760) 972 9742 | Other | La Quinta · Riverside County | — | — |
| Kws Construction | Kurt William Szalonek | — | (626) 786 4964 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Kyle Andrew Jones | Kyle Andrew Jones | — | (951) 259 9215 | GC, remodel, ADU | Hemet · Riverside County | — | — |
| Kyle Claveau Construction INC | Kyle Anthony Claveau | — | (951) 492 5406 | Other | Menifee · Riverside County | — | — |
| Kyle Desteuben | Kyle Desteuben | — | (909) 478 2677 | Electricians | Norco · Riverside County | — | — |
| Kyle Killam | Kyle Killam | — | (909) 752 2845 | GC, remodel, ADU | Mira Loma · Riverside County | — | — |
| Kyle Piche Custom Builders | Kyle Piche Custom Builders | — | (951) 445 3724 | GC, remodel, ADU | Idyllwild · Riverside County | — | — |
| Kyle Roark | Kyle Roark | — | (909) 478 4782 | Other | Beaumont · Riverside County | — | — |