| Nick W Ozier Design And Construction | Nick Wilder Ozier | — | (510) 773 4863 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Nick's Concrete | Nick's Concrete | — | (510) 468 2058 | Other | Union City · Alameda County | — | — |
| Nick's Flooring | Nick's Flooring | — | (925) 456 6425 | Other | Livermore · Alameda County | — | — |
| Nick's General Construction Corporation | Nickbakhsh Fahandezh Saadi | — | (510) 367 3767 | GC, remodel, ADU | Albany · Alameda County | — | — |
| Nick's Roofing | Gallo Chrystal | — | (510) 944 2118 | Other roofers | Hayward · Alameda County | — | — |
| Nico Echeverria Landscape | Nico Echeverria Landscape | — | (925) 961 0303 | Windows, patio, painters | Livermore · Alameda County | — | — |
| Nielsen Construction General Contractor | Michael Louie Nielsen | — | (510) 657 6715 | Electricians | Fremont · Alameda County | — | — |
| Nielsen Electric | Eric Edward Nielsen | — | (510) 867 8881 | Electricians | Alameda · Alameda County | — | — |
| Nieto Valle Construction INC | Julio Eduardo Nieto Valle | info@nietovalleconstruction.com | (510) 901 7188 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Nijssen Electric | Paulus Johannes Nijssen | — | (510) 779 3645 | Electricians | Berkeley · Alameda County | — | — |
| Nikos Construction Company | Nicholas George Giouzelis | — | (510) 334 4204 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| Niles Electric Company | Jody Ray Brahmst | — | (510) 797 2500 | Electricians | Livermore · Alameda County | — | — |
| Ningzhi Hu Signs Company | Hu Ningzhi | — | (510) 906 8888 | Other | Hayward · Alameda County | — | — |
| Nitram Acoustics | Nitram Acoustics | — | (510) 427 4700 | Other | Hayward · Alameda County | — | — |
| Nix Woodwork & Construction | Walter Warren Jr Nix | — | (510) 504 0670 | GC, remodel, ADU | Berkeley · Alameda County | — | — |
| No Limit Construction | Shadeed Al-muntaqim Asad | interested@domainmarket.com | (510) 485 3103 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Noa Construction LLC | Gregory Chi Stanat | — | (415) 604 4587 | GC, remodel, ADU | Berkeley · Alameda County | — | — |
| Noble Painting | Noble Painting | — | (925) 989 7946 | Windows, patio, painters | Livermore · Alameda County | — | — |
| Noe's Plumbing & Sewer Services INC | Garduno Noe Jaramillo | — | (408) 551 8892 | Other | Fremont · Alameda County | — | — |
| Noel H La Berge DBA Carpet Warehouse | Carpet Warehouse | — | (510) 406 9372 | Other | Newark · Alameda County | — | — |
| Noel Moreno Masonry | Noel Moreno Masonry | — | (510) 427 5214 | Other | Hayward · Alameda County | — | — |
| Noel's Professional Painting | Noel's Professional Painting | — | (510) 798 0891 | Windows, patio, painters | San Leandro · Alameda County | — | — |
| Nor - Cal Heating And Airconditioning | Juan Frank Jr Pineda | — | (510) 887 8076 | HVAC | San Leandro · Alameda County | — | — |
| Nor Cal Installation Services | Howard John Hammons | — | (510) 780 2691 | Other | Hayward · Alameda County | — | — |
| Nor-cal Wall Systems | Nor-cal Wall Systems | — | (510) 458 0458 | Other | Livermore · Alameda County | — | — |
| Norcal 2002 INC | Gerard Henri Dahan | — | (510) 471 9551 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Norcal Construction & Development INC | Michael Glenn Harvey | — | (925) 449 7774 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| Norcal Custom Drywall INC | Jose Ernesto Guardado Leiva | — | (510) 512 3091 | Other | Emeryville · Alameda County | — | — |
| Norcal Made INC | Lisa Keren Mentz-Sievers | — | (209) 294 4727 | Electricians | Livermore · Alameda County | — | — |
| Norcal Pool INC | Ryan Andrew Steele | — | (925) 549 6801 | Pool | Livermore · Alameda County | — | — |
| Norcal Restoration & Remediation INC | Michael Glenn Harvey | — | (855) 966 7225 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| Norcal Rock INC | Steven Jeffrey Navarro | — | (510) 636 9860 | Other | Oakland · Alameda County | — | — |
| Norcal Roofing Services INC | Luis Miguel Avelar Lozano | avelarlm0@gmail.com | (510) 613 3624 | Other roofers | Oakland · Alameda County | — | — |
| Norcaledison Electric | Seyed Hamid Reza Amirriazi | — | (408) 821 8011 | Electricians | Fremont · Alameda County | — | — |
| Norma Construction INC | Kenneth Wing Kan Kwan | — | (510) 303 4936 | GC, remodel, ADU | Dublin · Alameda County | — | — |
| Norman Barahona Electrical Services | Norman Giovanni Barahona | — | (415) 302 9741 | Electricians | Oakland · Alameda County | — | — |
| Norstar Construction | Charles Robert Below | — | (510) 333 9399 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| North American Fence & Railing INC | Kira Dianne Comini | — | (510) 436 0755 | Other | Oakland · Alameda County | — | — |
| North Bay Construction INC | Jose De Jesus Navarro | — | (415) 685 5903 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| North Berkeley Design & Construction INC | Erol Nolan Yildiz | — | (510) 684 4647 | GC, remodel, ADU | Berkeley · Alameda County | — | — |