| Northbay Well And Pump LLC | Kim Dean Anderson | — | (707) 755 1149 | Other | Petaluma · Sonoma County | — | — |
| Northbound Plumbing | Northbound Plumbing | — | (707) 806 6991 | Other | Santa Rosa · Sonoma County | — | — |
| Northen Painting | Northen Painting | — | (707) 433 7704 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Northern California Power & Equipment Co INC | David Allen Dorr | — | (707) 431 8022 | GC, remodel, ADU | Healdsburg · Sonoma County | — | — |
| Northern Constructions | Northern Constructions | — | (707) 696 8063 | GC, remodel, ADU | Sonoma · Sonoma County | — | — |
| Northern Electric INC | Michael Leroy Chiappari | — | (707) 571 2265 | Electricians | Santa Rosa · Sonoma County | — | — |
| Northern Hills Construction LLC | Yuri Elijah Hill | — | (707) 791 6933 | GC, remodel, ADU | Guerneville · Sonoma County | — | — |
| Northern Light Tree LLC | Benjamin Cavers Dougherty | nltreeworks@gmail.com | (707) 326 5739 | Tree | Bodega · Sonoma County | — | — |
| Northern Lighting And Electric | Corona-espinoza Andrew | — | (707) 955 0779 | Electricians | Sebastopol · Sonoma County | — | — |
| Northern Lights Electric | Elliot Charles Welch | — | (707) 996 1910 | Electricians | Sonoma · Sonoma County | — | — |
| Northern Oaks Landscape LLC | Emmanuel Barajas | — | (707) 332 7000 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Northern Oasis Pool Services | Omar Christopher Mughannam | — | (707) 494 7787 | Pool | Petaluma · Sonoma County | — | — |
| Northern Pacific Fire Protection INC | Jared Allen Cooper Rafferty | — | (707) 889 6016 | Other | Windsor · Sonoma County | — | — |
| Northern Pacific Power Systems INC | James William Paterson | — | (707) 528 7652 | Electricians | Santa Rosa · Sonoma County | — | — |
| Northern Pacific Roofing INC | Barry Charles Murrin | admin@northernpacificroofing.com | (415) 456 3482 | Other roofers | Petaluma · Sonoma County | — | — |
| Northern Plumbing | Charles Timothy Petersen | — | (707) 775 5390 | Other | Rohnert Park · Sonoma County | — | — |
| Northgate Company INC | John Christian Higgins | — | (707) 584 7888 | Other | Rohnert Park · Sonoma County | — | — |
| Northgates In Motion INC | John Samuel Nieman | — | (707) 584 3000 | Other | Rohnert Park · Sonoma County | — | — |
| Northstar Concrete Construction | Vincente Gaona | — | (707) 280 4122 | Other | Santa Rosa · Sonoma County | — | — |
| Northview Landscaping INC | Juan Humberto Lopez | — | (707) 657 9508 | Windows, patio, painters | Windsor · Sonoma County | — | — |
| Northwest Electric INC | Javier Saucedo Sr Rosales | — | (707) 433 9668 | Electricians | Healdsburg · Sonoma County | — | — |
| Northwest General Engineering LLC | Jason Shane Holtzinger | — | (707) 579 1163 | Other | Santa Rosa · Sonoma County | — | — |
| Novara Landscape And Construction | Steven Garcia-Ochoa | — | (707) 322 7019 | Windows, patio, painters | Petaluma · Sonoma County | — | — |
| Novato Fence | Novato Fence | novfencelumber@aol.com | (415) 897 1166 | Other | Santa Rosa · Sonoma County | — | — |
| Np Plumbing | Np Plumbing | — | (707) 548 3265 | Other | Windsor · Sonoma County | — | — |
| Nr Electric | Nestor Ezequiel Martinez Rodriguez | — | (707) 479 1370 | Electricians | Petaluma · Sonoma County | — | — |
| Nucleus Permaculture | Nucleus Permaculture | — | (707) 775 5746 | Windows, patio, painters | Sebastopol · Sonoma County | — | — |
| Nunez Construction | Nunez Arnie | jay@nunez-construction.com | (707) 486 5201 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Nunez Quality Painting | Nunez Quality Painting | — | (707) 235 1123 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Nunley Engineering INC | Michael Alan Nunley | — | (707) 584 3633 | Other | Santa Rosa · Sonoma County | — | — |
| Nyberg Landscaping Incorporated | Eric Steven Nyberg | — | (707) 996 5221 | Windows, patio, painters | Sonoma · Sonoma County | — | — |
| Nystrom Landscape | Nystrom Landscape | — | (707) 695 6401 | Windows, patio, painters | Fulton · Sonoma County | — | — |
| O B A Waterproofing | O B A Waterproofing | — | (707) 694 3380 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| O F D Electric INC | Olin Frank Daunell | — | (707) 762 6714 | Electricians | Petaluma · Sonoma County | — | — |
| O Mendez Construction | Oscar Omar Mendez | — | (707) 338 9360 | GC, remodel, ADU | Rohnert Park · Sonoma County | — | — |
| O'brien Energy Systems | O'brien Energy Systems | — | (707) 548 6569 | Electricians | Santa Rosa · Sonoma County | — | — |
| O'brien Painting | Dustin Walter O'brien | — | (707) 799 6578 | Windows, patio, painters | Petaluma · Sonoma County | — | — |
| O'briens Floor Covering | O'briens Floor Covering | — | (707) 318 4824 | Other | Santa Rosa · Sonoma County | — | — |
| O'dowd Plumbing INC | James Anthony Dowd | impallari@gmail.com | (415) 793 0615 | Other | Rohnert Park · Sonoma County | — | — |
| O'rourke Electric INC | Daniel Timothy O'rourke | info@orourkeelectric.com | (707) 528 8539 | Electricians | Santa Rosa · Sonoma County | — | — |