| Norris Tower Incorporated | Todd Garrison Norris | — | (951) 684 2255 | Electricians | Riverside · Riverside County | — | — |
| Norsouth Construction | Cuevas Fernando Madrigal | — | (951) 522 4990 | GC, remodel, ADU | Lake Elsinore · Riverside County | — | — |
| North Coast Skylights INC | Robert James Lawhead | eben@eyebytes.com | (760) 716 8453 | Windows, patio, painters | Temecula · Riverside County | — | — |
| North Col Construction | Stephen Andre Du Toit | — | (949) 233 5292 | GC, remodel, ADU | Temecula · Riverside County | — | — |
| North County Pump Service INC | Aaron Trent Whaley | — | (951) 676 6060 | Other | Hemet · Riverside County | — | — |
| North County Scaffold LLC | Sidney Lee Montgomery | — | (760) 741 7963 | Other | Menifee · Riverside County | — | — |
| North Star Electric | Rene Joseph Boisvert | — | (760) 250 1239 | Electricians | Palm Springs · Riverside County | — | — |
| Northwinds Air LLC | Miles Kim Harry | — | (510) 507 3019 | HVAC | Riverside · Riverside County | — | — |
| Norton Construction | Kenneth Wayne Norton | — | (760) 815 3760 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Nostalgia Metal Fabrication | Nostalgia Metal Fabrication | — | (760) 673 5021 | Other | Desert Hot Springs · Riverside County | — | — |
| Notable Construction | Jesus Antonio Perez Figueroa | — | (562) 846 7882 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Notheisen Construction Co | Notheisen George | — | (951) 392 2453 | GC, remodel, ADU | Hemet · Riverside County | — | — |
| Nova Lux Construction | Cervantes Pineda Brian | — | (951) 903 0824 | GC, remodel, ADU | Jurupa Valley · Riverside County | — | — |
| Nova Pool Plastering INC | Dario Lopez | — | (951) 531 6661 | Pool | Corona · Riverside County | — | — |
| Novakrete | Farias Pantoja Israel | — | (714) 501 4898 | Other | Corona · Riverside County | — | — |
| Novi Environmental INC | Elaine Marie Samarin | — | (951) 471 2033 | Other | Lake Elsinore · Riverside County | — | — |
| Novins Electric | Mark Ronald Novins | — | (951) 796 5337 | Electricians | Canyon Lake · Riverside County | — | — |
| Now Construction | Robert Donald Hudson | — | (951) 663 6041 | GC, remodel, ADU | Romoland · Riverside County | — | — |
| Npg INC | Sharon Jean Nelson | — | (951) 940 0200 | GC, remodel, ADU | Perris · Riverside County | — | — |
| Nrg Landcare | Nrg Landcare | — | (760) 485 6015 | Windows, patio, painters | Indio · Riverside County | — | — |
| Nrg Property Services INC | Nestor Ramiro Guerrido | — | (760) 668 5213 | GC, remodel, ADU | Indio · Riverside County | — | — |
| Nu - Cal Pipeline Corp | Noah Frank Schmitz | — | (951) 742 7555 | Other | Jurupa Valley · Riverside County | — | — |
| Nu Aire Heating & A/c | Nu Aire Heating & A/c | — | (951) 278 8764 | HVAC | Corona · Riverside County | — | — |
| Nu Cabling INC | Uri Ben | — | (951) 415 8824 | Other | Murrieta · Riverside County | — | — |
| Nu Gen Electric | Gallegos Javier | — | (909) 730 5743 | Electricians | Riverside · Riverside County | — | — |
| Nu-fit Construction & Renovations | Rodricus Orlandus Bryant | — | (951) 373 0251 | GC, remodel, ADU | Wildomar · Riverside County | — | — |
| Nu-tech Construction Services | Renteria Jesus | — | (951) 423 1487 | GC, remodel, ADU | Nuevo · Riverside County | — | — |
| Nuenergy Atlanta Electrical | S-carr Shy Mahdi | — | (404) 410 6537 | Electricians | Murrieta · Riverside County | — | — |
| Nuevo Fence Company | Samuel Joseph Gouveia | — | (760) 481 2424 | Other | Nuevo · Riverside County | — | — |
| Nuevo Plumbing INC | Armando Ruben Lopez | — | (951) 355 6059 | Other | Nuevo · Riverside County | — | — |
| Nuhome Fog Coat & Painting LLC | Jacob Michael Briggs | — | (951) 409 5571 | Windows, patio, painters | Murrieta · Riverside County | — | — |
| Nuline Electric | De La Torre Eddy | — | (760) 908 3345 | Electricians | Palm Desert · Riverside County | — | — |
| Numark | Barcelo Jorge | — | (760) 610 3997 | GC, remodel, ADU | Palm Desert · Riverside County | — | — |
| Nunez Construction | Nunez Roy | jay@nunez-construction.com | (626) 233 5525 | GC, remodel, ADU | Norco · Riverside County | — | — |
| Nunez Electric | Paul Michael B Nunez | — | (951) 378 3915 | Electricians | Hemet · Riverside County | — | — |
| Nunez Electric | Manuel Magana Nunez | — | (760) 625 5879 | Electricians | Coachella · Riverside County | — | — |
| Nunez Roofing INC | Orozco Fernando Nunez | — | (909) 927 0420 | Other roofers | Riverside · Riverside County | — | — |
| Nuno's Painting LLC | Leonardo Rafael Nuno | — | (714) 618 0581 | Windows, patio, painters | Jurupa Valley · Riverside County | — | — |
| Nuvia Water Technologies INC | Kellie Jean Johnson | — | (951) 734 7400 | Other | Corona · Riverside County | — | — |
| Nuview Plumbing LLC | William Candler Iv Tomlinson | — | (619) 818 3530 | Other | Nuevo · Riverside County | — | — |