| Kana Development Group INC | Daniel Alan Locke | — | (714) 986 1400 | Other | Riverside · Riverside County | — | — |
| Kana Pipeline INC | Daniel Alan Locke | — | (714) 986 1400 | Other | Riverside · Riverside County | — | — |
| Kana Subsurface Engineering | Patrick Sean Burns | — | (909) 204 5987 | Electricians | Riverside · Riverside County | — | — |
| Kanguros Bros Pool | Victor Manuel Garcia | — | (909) 408 9686 | Pool | Jurupa Valley · Riverside County | — | — |
| Kanoski Painting & Decorating | Kanoski Painting & Decorating | — | (760) 221 1250 | Windows, patio, painters | Indio · Riverside County | — | — |
| Kanter Construction | Robert Charles Kanter | — | (951) 236 9652 | GC, remodel, ADU | Idyllwild · Riverside County | — | — |
| Kaplan Heating & Air | Kaplan Heating & Air | — | (800) 789 8863 | HVAC | Mira Loma · Riverside County | — | — |
| Kaps INC | Frank Valentine Iv Marshall | — | (760) 636 1502 | Pool | Thousand Palms · Riverside County | — | — |
| Karen Fay Hill | Karen Fay Hill | — | (951) 926 2222 | GC, remodel, ADU | Winchester · Riverside County | — | — |
| Karen French Designs | Karen French Designs | — | (760) 327 7336 | GC, remodel, ADU | Palm Springs · Riverside County | — | — |
| Karl F Suess Const | Karl F Suess Const | — | (760) 341 4950 | GC, remodel, ADU | Rancho Mirage · Riverside County | — | — |
| Karlx Construction | Rodriguez Alejandro Carrillo | — | (760) 427 2848 | GC, remodel, ADU | Thermal · Riverside County | — | — |
| Kaser Electric INC | George E Kaser | — | (949) 370 1392 | Electricians | Norco · Riverside County | — | — |
| Kashou Climate Control INC | David Elias Kashou | — | (951) 270 2600 | HVAC | Corona · Riverside County | — | — |
| Kasinger Roofing INC | Danny Eugene Kasinger | — | (951) 743 8132 | Other roofers | Riverside · Riverside County | — | — |
| Kassel Contracting Incorporated | Aaron Eric Bell | — | (951) 353 1495 | Other | Riverside · Riverside County | — | — |
| Kat Pipeline | Austin James Matus | — | (951) 348 9296 | Other | Menifee · Riverside County | — | — |
| Kaufman Consultation Corp | Neil Ray Kaufman | — | (951) 445 7207 | Other | Calimesa · Riverside County | — | — |
| Kaufmann Plumbing | Reto Kaufmann | — | (760) 784 4095 | Other | Desert Hot Springs · Riverside County | — | — |
| Kaydann Corporation | Cynthia Fay Clark | — | (951) 609 3743 | GC, remodel, ADU | Temecula · Riverside County | — | — |
| Kaydee Builders | Kaydee Builders | — | (760) 414 0924 | GC, remodel, ADU | Anza · Riverside County | — | — |
| Kb Climate Services INC | Robert Warren Wachter | — | (951) 470 6419 | HVAC | Riverside · Riverside County | — | — |
| Kb Sheet Metal Systems | Kurtus John Blanchette | — | (951) 234 4051 | Other | Murrieta · Riverside County | — | — |
| Kbaa Builders INC | Jose Luis Aguilera Hernandez | kbaa@gmail.com | (562) 359 5599 | GC, remodel, ADU | Jurupa Valley · Riverside County | — | — |
| Kcb Towers INC | S Lynn Bogh | — | (909) 862 0322 | GC, remodel, ADU | Banning · Riverside County | — | — |
| Kcd Electric | Ricky Ray Reaves | — | (951) 434 3277 | Electricians | Menifee · Riverside County | — | — |
| Kdk Electric | David Anthony Wohltman | — | (951) 492 1144 | Electricians | Hemet · Riverside County | — | — |
| Kdp Plumbing | Kurtis Daniel Platt | — | (951) 833 3006 | Other | Norco · Riverside County | — | — |
| Ke Concrete Company | Perez-cacho David | — | (951) 532 3751 | Other | Lake Elsinore · Riverside County | — | — |
| Kecko Plumbers | Kecko Plumbers | — | (951) 505 3815 | Other | Riverside · Riverside County | — | — |
| Kee Solutions INC | James Patrick Keegan | — | (951) 898 6000 | Other | Temecula · Riverside County | — | — |
| Keefer Electric | Gregory Laurence Keefer | — | (951) 541 5788 | Electricians | Canyon Lake · Riverside County | — | — |
| Keen Energy INC | Erich Allen Fromlath | — | (949) 877 8008 | Electricians | Murrieta · Riverside County | — | — |
| Keep It Clean Construction | Perez Montoya Kadeem | — | (951) 282 0300 | GC, remodel, ADU | Idyllwild · Riverside County | — | — |
| Keeton Construction Co INC | Bruce Gailey Keeton | info@keetonconstruction.com | (951) 296 6400 | GC, remodel, ADU | Temecula · Riverside County | — | — |
| Keith Banks Construction | Keith Tim Banks | — | (951) 741 3947 | GC, remodel, ADU | Perris · Riverside County | — | — |
| Keith Hull's Pool Service INC | Keith Robert Hull | — | (760) 636 1037 | Pool | Palm Desert · Riverside County | — | — |
| Kelco Builders INC | Jordan Kelley Johnson | — | (951) 595 0126 | GC, remodel, ADU | Murrieta · Riverside County | — | — |
| Kelcon | James John Iii Kelly | — | (714) 390 7832 | GC, remodel, ADU | Wildomar · Riverside County | — | — |
| Kellner Construction | Jeffrey Francis Kellner | — | (760) 774 5333 | GC, remodel, ADU | Desert Hot Springs · Riverside County | — | — |