| Nikos Painting Co | Nicholas George Ieromnimon | — | (760) 427 9673 | Windows, patio, painters | Desert Hot Springs · Riverside County | — | — |
| Nilesh Kumar | Nilesh Kumar | — | (760) 641 3045 | GC, remodel, ADU | Palm Springs · Riverside County | — | — |
| Nimmo Construction | Nimmo Bruce | — | (619) 851 1206 | GC, remodel, ADU | Murrieta · Riverside County | — | — |
| Nio Construction | Salazar Antonio | — | (951) 313 3803 | GC, remodel, ADU | Moreno Valley · Riverside County | — | — |
| Nir Plumbing INC | Lopez Nick | — | (951) 300 6681 | HVAC | Riverside · Riverside County | — | — |
| Nishiken Const Co | Kook Hwan Kim | — | (213) 447 5095 | GC, remodel, ADU | Corona · Riverside County | — | — |
| Nixc Construction | Arian Mohammed Afzali | — | (951) 733 2263 | GC, remodel, ADU | Murrieta · Riverside County | — | — |
| Nixon Plumbing Co | Bradley Tilford Nixon | — | (760) 217 5222 | Other | Bermuda Dunes · Riverside County | — | — |
| No Limit Builder | No Limit Builder | — | (951) 842 1482 | GC, remodel, ADU | Menifee · Riverside County | — | — |
| No Limit Builders | No Limit Builders | — | (951) 300 8146 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| No Limit Landscape | No Limit Landscape | nolimitlandscapingservice@gmail.com | (951) 395 4992 | Windows, patio, painters | Murrieta · Riverside County | — | — |
| No Pressure Landscape Services | Lennix Sullivan Gibson | — | (951) 477 1988 | Windows, patio, painters | Murrieta · Riverside County | — | — |
| No Shorts | No Shorts | — | (951) 692 0028 | Electricians | Menifee · Riverside County | — | — |
| No Shorts Electrical Services | Christopher Timothy Schultz | — | (760) 888 7345 | Electricians | La Quinta · Riverside County | — | — |
| No Worries Construction | Kurt David Scorza | — | (714) 933 5538 | GC, remodel, ADU | Wildomar · Riverside County | — | — |
| Noble Electric INC | Matthew David Parise | interested@domainmarket.com | (951) 258 6420 | Electricians | Menifee · Riverside County | — | — |
| Noble Investments | Noble Investments | — | (951) 269 2120 | GC, remodel, ADU | Moreno Valley · Riverside County | — | — |
| Noble Knights INC | Munawar Awais | — | (951) 407 0490 | GC, remodel, ADU | Lake Elsinore · Riverside County | — | — |
| Nochis Construction & Landscaping Services | Johan Roy Gonzalez | — | (951) 294 7042 | GC, remodel, ADU | Lake Elsinore · Riverside County | — | — |
| Nochty General Construction Co | Rosete Artemio Melendez | — | (714) 333 6802 | GC, remodel, ADU | Jurupa Valley · Riverside County | — | — |
| Nohaks Glass And Mirror | Nohaks Glass And Mirror | — | (760) 449 7603 | Windows, patio, painters | Coachella · Riverside County | — | — |
| Nol Garage Doors And Gates INC | Nagar Avraham | — | (818) 669 4414 | Other | Riverside · Riverside County | — | — |
| Nolan's Custom Glass INC | Ric Jason Nolan | — | (951) 534 1830 | Windows, patio, painters | Calimesa · Riverside County | — | — |
| Nolasco Bros Plumbing INC | Nolasco Mateo | — | (760) 518 3156 | Other | Murrieta · Riverside County | — | — |
| Nolasco Welding Services INC | Edgar Nolasco | — | (323) 383 6731 | Other | Jurupa Valley · Riverside County | — | — |
| Nonstop Roofing Co | Michelle A Olivares Caudillo | — | (951) 563 4023 | Other roofers | Romoland · Riverside County | — | — |
| Nootbaar Plumbing INC | Dirk Warren Gardner | — | (951) 246 4337 | HVAC | Murrieta · Riverside County | — | — |
| Norberts Landscape Irrigation | Norberts Landscape Irrigation | — | (951) 965 0790 | Other | Riverside · Riverside County | — | — |
| Norco Drywall System INC | Avalos Ismael Cervantes | — | (323) 327 3934 | Other | Norco · Riverside County | — | — |
| Norco Electric | Zarate Alex | contact@norcoelectric.com | (951) 961 4460 | Electricians | Norco · Riverside County | — | — |
| Norco Epoxy Concrete Coatings | Norco Epoxy Concrete Coatings | — | (951) 963 6708 | Other | Corona · Riverside County | — | — |
| Norco Plumbing & Drain Cleaning | Norco Plumbing & Drain Cleaning | — | (951) 858 5259 | Other | Norco · Riverside County | — | — |
| Norfel Security Systems INC | Paul Michael Gomez | — | (888) 667 3351 | Alarm and generators | Lake Elsinore · Riverside County | — | — |
| Noriega And Sons Landscape Corp | Ramon Noriega | — | (951) 312 4458 | Windows, patio, painters | Moreno Valley · Riverside County | — | — |
| Norins Telcom | Lasse Norin | — | (909) 979 7354 | Other | Wildomar · Riverside County | — | — |
| Norlan's Pool Construction & Services | Norlan J Gonzalez | — | (760) 898 8393 | Pool | Cathedral City · Riverside County | — | — |
| Norman Busch | Norman Busch | — | (909) 260 3792 | Electricians | Lake Elsinore · Riverside County | — | — |
| Norman Simoneau | Norman Simoneau | — | (951) 454 4235 | Windows, patio, painters | Temecula · Riverside County | — | — |
| Normans Mobile Home Transport | Normans Mobile Home Transport | — | (909) 262 8847 | Other | Aguanga · Riverside County | — | — |
| Norris Construction | Brian David Norris | — | (951) 318 0474 | GC, remodel, ADU | Riverside · Riverside County | — | — |