| North Valley Arbor Management INC DBA North Valley Tree Service | Jess Rollie Wills | — | (530) 893 9649 | Tree | Chico · Butte County | — | — |
| North Valley Building Systems INC | Andrew James Wood | — | (530) 345 7296 | GC, remodel, ADU | Chico · Butte County | — | — |
| North Valley Drywall | North Valley Drywall | — | (530) 343 7690 | Other | Forest Ranch · Butte County | — | — |
| North Valley Excavation | North Valley Excavation | — | (530) 682 0322 | Other | Oroville · Butte County | — | — |
| North Valley Fence | North Valley Fence | info@northvalleyfence.com | (530) 342 6791 | Other | Paradise · Butte County | — | — |
| North Valley Rain Gutter | North Valley Rain Gutter | — | (530) 894 3347 | GC, remodel, ADU | Chico · Butte County | — | — |
| North Valley Water Solutions | Bodie Marcus Schwartz | — | (530) 518 1163 | Other | Gridley · Butte County | — | — |
| Northern California Fence | Michele Lyn Mc Cormick | — | (530) 891 1346 | Other | Chico · Butte County | — | — |
| Northern Oaks Construction | Gordon Ray Morrison | jryan@northernoaksconstruction.com | (530) 720 4129 | GC, remodel, ADU | Oroville · Butte County | — | — |
| Northern Pacific Electric | Matthew John Thorpe | — | (530) 898 9220 | Electricians | Durham · Butte County | — | — |
| Northern Valley Earthwork | Ruben Jr Medrano | — | (530) 712 1818 | Other | Durham · Butte County | — | — |
| Northstate Concrete | Northstate Concrete | — | (530) 715 4492 | Other | Chico · Butte County | — | — |
| Northstate Iron Works | Northstate Iron Works | northstateironworks@gmail.com | (530) 228 7014 | Other | Chico · Butte County | — | — |
| Norton Construction | Paul Ellis Norton | — | (530) 873 2176 | GC, remodel, ADU | Magalia · Butte County | — | — |
| Norton Construction | Dennis Lloyd Norton | — | (530) 370 2691 | GC, remodel, ADU | Oroville · Butte County | — | — |
| Nortons Roofing | Francis Aloyisus Norton | — | (530) 327 8880 | Other roofers | Paradise · Butte County | — | — |
| Nova Electric | Jeffrey Bruce Arnett | — | (530) 815 5546 | Electricians | Magalia · Butte County | — | — |
| O'rear Construction | Rickey Gene O'rear | — | (530) 893 0961 | GC, remodel, ADU | Chico · Butte County | — | — |
| O'ryans Home Repair | O'ryans Home Repair | — | (530) 403 6649 | GC, remodel, ADU | Oroville · Butte County | — | — |
| Oak Ridge Cabinets INC | Ryan Scott Bechhold | — | (530) 893 8774 | GC, remodel, ADU | Chico · Butte County | — | — |
| Oak Ridge Enterprise | Oak Ridge Enterprise | — | (530) 893 8774 | GC, remodel, ADU | Chico · Butte County | — | — |
| Olli's Pressure Washing INC | Olli Matti Auvinen | — | (530) 895 8447 | Other | Chico · Butte County | — | — |
| One Mile Construction | Paul Douglas Westwood | — | (530) 354 1815 | GC, remodel, ADU | Chico · Butte County | — | — |
| One Source Builders INC | David Allen Fleenor | — | (530) 630 9498 | GC, remodel, ADU | Paradise · Butte County | — | — |
| One Way Tile | One Way Tile | — | (530) 680 2799 | Other | Forest Ranch · Butte County | — | — |
| One Wire Electric | Calem Jacob Tamayo | — | (925) 364 0526 | Electricians | Paradise · Butte County | — | — |
| Orlando's Landscape | Orlando's Landscape | — | (530) 877 2754 | Windows, patio, painters | Paradise · Butte County | — | — |
| Ornamental Iron Works | Ornamental Iron Works | — | (530) 570 1094 | Other | Chico · Butte County | — | — |
| Oro Lake Constructors | Oro Lake Constructors | — | (530) 864 1520 | GC, remodel, ADU | Oroville · Butte County | — | — |
| Oroville Electric | Carrillo Labrada Jim | — | (530) 990 3783 | Electricians | Oroville · Butte County | — | — |
| Oroville Garage Door & Gates | Oroville Garage Door & Gates | — | (530) 370 2520 | Other | Oroville · Butte County | — | — |
| Oroville Safe Lock & Door Company | Scott Dougals Damon | — | (530) 534 0950 | Other | Oroville · Butte County | — | — |
| Outpost Energy Systems | Outpost Energy Systems | — | (530) 588 2316 | Electricians | Paradise · Butte County | — | — |
| Over The Top Tree INC | Brody Michael Lewis | — | (530) 685 0413 | Other | Chico · Butte County | — | — |
| Owen's Flooring | Owen's Flooring | — | (530) 520 1490 | Other | Magalia · Butte County | — | — |
| P D P Engineering | P D P Engineering | — | (530) 588 0367 | Other | Chico · Butte County | — | — |
| P31 Enterprises INC | Melissa Joy Huizinga | lcurtis@p31enterprises.com | (530) 353 6276 | Windows, patio, painters | Oroville · Butte County | — | — |
| Pacific Trail Insulation | Pacific Trail Insulation | — | (530) 518 3151 | Other | Oroville · Butte County | — | — |
| Pacific West | Pacific West | — | (530) 338 9309 | HVAC | Magalia · Butte County | — | — |
| Palafox Concrete | Palafox Concrete | — | (530) 923 5981 | Other | Gridley · Butte County | — | — |