| Nelms Construction | Jeffery Kyle Nelms | jeff@nelmsconstruction.com | (916) 764 4887 | GC, remodel, ADU | Davis · Yolo County | — | — |
| Neri Construction | Daniel Joseph Neri | — | (530) 867 4833 | GC, remodel, ADU | Woodland · Yolo County | — | — |
| New-cali Landscapes | New-cali Landscapes | — | (760) 920 7239 | Windows, patio, painters | Davis · Yolo County | — | — |
| Next Level General Engineering INC | Edward Latin Wade | — | (530) 902 5710 | Other | Yolo · Yolo County | — | — |
| Nicholas Deslauriers | Nicholas Deslauriers | — | (530) 400 6650 | GC, remodel, ADU | West Sacramento · Yolo County | — | — |
| Nicholas E Arellano | Nicholas E Arellano | — | (530) 848 3712 | GC, remodel, ADU | Woodland · Yolo County | — | — |
| Nichols Plumbing | Nichols Plumbing | — | (530) 662 1502 | Other | Woodland · Yolo County | — | — |
| Nioliss INC | Sergey Nikolayevich Istomin | — | (916) 548 4316 | Other | West Sacramento · Yolo County | — | — |
| Noble Methane Service | Brent Leroy Noble | — | (530) 668 7961 | Other | W Sacramento · Yolo County | — | — |
| Norcal Construction INC | Redi Ahad | — | (916) 402 6466 | GC, remodel, ADU | West Sacramento · Yolo County | — | — |
| Norcal Home Services INC | Kurt Laverne Tetrault | — | (707) 318 6844 | GC, remodel, ADU | Woodland · Yolo County | — | — |
| Norcal Painting | Daniel Bezgodov | — | (916) 573 0664 | Windows, patio, painters | West Sacramento · Yolo County | — | — |
| Norcal Plumbing | Norcal Plumbing | — | (530) 908 6856 | Other | Woodland · Yolo County | — | — |
| Norcal State Builders INC | James Kelsey Maus | admin@norcalstatebuilders.com | (530) 208 9883 | GC, remodel, ADU | Woodland · Yolo County | — | — |
| Norcal Tile & Marble | Norcal Tile & Marble | — | (916) 870 5948 | Other | West Sacramento · Yolo County | — | — |
| North Delta Builders INC | Patrick Michael Brewer | — | (916) 479 3036 | GC, remodel, ADU | Clarksburg · Yolo County | — | — |
| North Pacific Plumbing INC | Brent Landon Dotson | — | (530) 845 1121 | Other | Davis · Yolo County | — | — |
| North Point Plumbing | North Point Plumbing | — | (916) 799 0458 | Other | West Sacramento · Yolo County | — | — |
| North State Paving | Frank Joseph Jr Stevens | — | (916) 796 2162 | Other | West Sacramento · Yolo County | — | — |
| Northern Valley Construction & Renovations LLC | Solorzano Francisco Hernandez | — | (916) 806 2792 | GC, remodel, ADU | Woodland · Yolo County | — | — |
| Northstar General Contracting | Daniel Dusel Sadler | — | (530) 979 7575 | GC, remodel, ADU | Davis · Yolo County | — | — |
| Novate Industrial Construction Services | Edward John Rogers | — | (650) 241 1661 | Electricians | West Sacramento · Yolo County | — | — |
| Np Builder | Np Builder | — | (530) 330 1665 | GC, remodel, ADU | Woodland · Yolo County | — | — |
| Nunez Construction Enterprises | Nunez Manuel | — | (916) 997 5778 | GC, remodel, ADU | West Sacramento · Yolo County | — | — |
| Nxt Level Construction | Luis Fernando Rodriguez | — | (530) 650 2579 | GC, remodel, ADU | Woodland · Yolo County | — | — |
| Nye Home Repair | Nye Home Repair | — | (530) 979 0487 | GC, remodel, ADU | Davis · Yolo County | — | — |
| O S Concrete | O S Concrete | — | (530) 650 1128 | Other | Woodland · Yolo County | — | — |
| O'hara Construction | Brendan Joseph O'hara | — | (530) 867 4399 | GC, remodel, ADU | Woodland · Yolo County | — | — |
| Oak Home Remodeling INC | Alejandro Jr Garcia | — | (916) 470 5950 | GC, remodel, ADU | Dunnigan · Yolo County | — | — |
| Oakridge Maintenance | Oakridge Maintenance | — | (707) 484 4633 | HVAC | Winters · Yolo County | — | — |
| Odell Construction INC | Christopher John Odell | — | (650) 376 7608 | GC, remodel, ADU | Woodland · Yolo County | — | — |
| Old Growth Sport Floors INC | Jauregui Javier | — | (916) 539 9712 | Other | West Sacramento · Yolo County | — | — |
| Old Oak Landscaping INC | Victor Mario Cano Gutierrez | — | (530) 392 6427 | Windows, patio, painters | Esparto · Yolo County | — | — |
| Olivos Irrigation LLC | Manuel Jose Prieto Perez | — | (916) 531 8946 | Windows, patio, painters | Woodland · Yolo County | — | — |
| Omar's Electric Works | Omar Da'ood Shareef | — | (916) 835 4556 | Electricians | West Sacramento · Yolo County | — | — |
| Omega Builders | Antunez Gonzalez Uriel | — | (916) 885 8310 | GC, remodel, ADU | Woodland · Yolo County | — | — |
| One Touch Media INC | Richard Charles Goulas | sales@onetouchmedia.com | (916) 290 9150 | Other | West Sacramento · Yolo County | — | — |
| Onyx X Construction LLC | Ruben Johnathan Medina | — | (530) 908 7254 | GC, remodel, ADU | Woodland · Yolo County | — | — |
| Optimal Electric | Aaron Luis Garcia | andrey@optimal-electric.com | (360) 635-7495 | Electricians | Woodland · Yolo County | — | — |
| Optimus Electric Services | Luimar Ali Gonzalez Ramos | — | (916) 534 5099 | Electricians | Woodland · Yolo County | — | — |