| Nin Construction LLC | Joe Louis Ii Nin | joeninconstruction@gmail.com | (707) 666 8516 | GC, remodel, ADU | Windsor · Sonoma County | — | — |
| Nissi Electric | Joshua Hernandez | — | (707) 806 2515 | Electricians | Rohnert Park · Sonoma County | — | — |
| Nj Wray Enterprises | Norman Joseph Wray | — | (707) 971 9275 | GC, remodel, ADU | Vineburg · Sonoma County | — | — |
| No Limits Construction | Frank Scott Crawford | — | (805) 907 9322 | GC, remodel, ADU | Santa Rosa Valley · Sonoma County | — | — |
| Nobi Design Build LLC | Connor Scott Bonyeau | connor@nobidesignbuild.com | (707) 955 0648 | GC, remodel, ADU | Cloverdale · Sonoma County | — | — |
| Noel's Painting And Decorating | Noel's Painting And Decorating | — | (707) 337 7821 | Windows, patio, painters | Sonoma · Sonoma County | — | — |
| Noonan Construction | Robert James Noonan | — | (707) 527 2802 | GC, remodel, ADU | Forestville · Sonoma County | — | — |
| Nor - Cal Painting Co | David Ray Lee | — | (707) 774 2278 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Nor Cal Excavating & Trucking | Nor Cal Excavating & Trucking | — | (707) 206 1402 | Other | Windsor · Sonoma County | — | — |
| Nor Cal Glass Products INC | William Joseph Jr Place | — | (707) 206 9660 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Nor Cal Master Plumbing INC | Jose Luis Rosales Montiel | — | (707) 978 6316 | Other | Santa Rosa · Sonoma County | — | — |
| Nor-cal Pumpworks | Gary David Wilson | gary@norcalpumpworks.com | (707) 765 2323 | Other | Petaluma · Sonoma County | — | — |
| Nor-cal Pumpworks LLC | Morgan Edwin Wilson | gary@norcalpumpworks.com | (707) 237 1484 | Other | Petaluma · Sonoma County | — | — |
| Norcal Electric | Alejandro Arango-Lopez | — | (707) 236 0526 | Electricians | Sebastopol · Sonoma County | — | — |
| Norcal HVAC | Norcal HVAC | — | (707) 338 7545 | HVAC | Cotati · Sonoma County | — | — |
| Norcal Maintenance INC | David Andrew Stankas | dave@norcalmaintenance.com | (707) 321 8477 | Other | Windsor · Sonoma County | — | — |
| Norcal Property Construction | Hau N Pham | — | (707) 889 1762 | GC, remodel, ADU | Rohnert Park · Sonoma County | — | — |
| Norcal Superior Systems INC | Carlos Alberto Sarmiento | norcalsuperiorsystems1@gmail.com | (707) 536 3338 | Other | Petaluma · Sonoma County | — | — |
| Nordby Construction Co | Craig Allen Nordby | — | (707) 526 4500 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Nordby Signature Homes INC | Craig Allen Nordby | domains@oxfg.com | (707) 526 4500 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Nordby Wine Caves INC | Richard Raymond Shone | — | (707) 526 4500 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Nordic Colors | Nordic Colors | — | (707) 837 2718 | Windows, patio, painters | Windsor · Sonoma County | — | — |
| Nordic Contractors Limited | Brett Cameron Christiansen | — | (707) 391 5561 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Nordin Excavating | Nordin Excavating | — | (707) 328 3215 | Other | Santa Rosa · Sonoma County | — | — |
| Norm's Electric Service | Normand Joseph Jaillet | — | (707) 823 5160 | Electricians | Sebastopol · Sonoma County | — | — |
| Norm's Woodworks | Norm's Woodworks | — | (707) 364 2220 | Other | Petaluma · Sonoma County | — | — |
| Norman Builders | Norman Builders | — | (415) 290 4472 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Norso Quality Painting LLC | Chavez Juan Benito | — | (707) 478 1145 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| North Bay A V S Design | Jonathan Thomas Mueller | — | (707) 526 4549 | Electricians | Santa Rosa · Sonoma County | — | — |
| North Bay Acoustics | North Bay Acoustics | — | (707) 824 1348 | Other | Sebastopol · Sonoma County | — | — |
| North Bay Adu & Additions | North Bay Adu & Additions | — | (707) 543 1716 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| North Bay Aquatics | Anthony Robert Mook | — | (707) 585 7727 | Pool | Geyserville · Sonoma County | — | — |
| North Bay Cabinets & Installation INC | John Anthony Calvi | — | (707) 280 5349 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| North Bay Carpentry | North Bay Carpentry | northbaycarpentry@gmail.com | (707) 535 9474 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| North Bay Comfort INC | Edgar David Recinos | edgar@northbaycomfort.com | (707) 591 1713 | HVAC | Santa Rosa · Sonoma County | — | — |
| North Bay Commercial Services INC | Michael Francis Mac Donald | — | (707) 953 6493 | HVAC | Santa Rosa · Sonoma County | — | — |
| North Bay Concrete INC | Scott Lennan Krisl | — | (707) 836 8500 | Other | Windsor · Sonoma County | — | — |
| North Bay Construction Services | Brian Louis Knecht | — | (707) 527 7097 | Other | Windsor · Sonoma County | — | — |
| North Bay Drywall & Construction | Christopher Monroe Arntz | — | (707) 583 3163 | GC, remodel, ADU | Cotati · Sonoma County | — | — |
| North Bay Electric | Richard Michael Gooler | — | (707) 538 8333 | Electricians | Windsor · Sonoma County | — | — |