| Nice View Tree Care | Martin Sr Salas Diaz | niceview.tree@gmail.com | (925) 497 7139 | Other | Concord · Contra Costa County | — | — |
| Niche Construction | Scott Arthur Hildula | — | (925) 322 2021 | GC, remodel, ADU | Martinez · Contra Costa County | — | — |
| Nicholas Bloisa | Nicholas Bloisa | — | (925) 922 2100 | GC, remodel, ADU | Pleasant Hill · Contra Costa County | — | — |
| Nicholas M Luengo Construction INC | Nicholas Michael Luengo | — | (510) 432 3028 | GC, remodel, ADU | Lafayette · Contra Costa County | — | — |
| Nicholl Construction | Aaron Allan Nicholl | — | (925) 250 5319 | GC, remodel, ADU | Discovery Bay · Contra Costa County | — | — |
| Nick Brown Construction INC | Nicholas Ryan Brown | eben@eyebytes.com | (925) 325 0535 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Nick Kam Loong Wong | Nick Kam Loong Wong | — | (925) 788 6531 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Nick Trigonis Construction | Nicholas J Trigonis | — | (925) 812 1403 | GC, remodel, ADU | Martinez · Contra Costa County | — | — |
| Nickel & Dime Plumbing INC | Ivan Marcello Escobar | — | (925) 435 7171 | Other | Pittsburg · Contra Costa County | — | — |
| Nickels HVAC | Cory John Nickels | — | (925) 212 7787 | HVAC | Concord · Contra Costa County | — | — |
| Nicklaw Construction | Justin Taylor Nicklaw | — | (925) 305 8084 | GC, remodel, ADU | Oakley · Contra Costa County | — | — |
| Nicky Dineen Construction | Nicky Mark Dineen | — | (925) 235 8058 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Nico Engineering INC | Lopez Nicolas Hernandez | — | (510) 313 8166 | Other | San Pablo · Contra Costa County | — | — |
| Nicolas Ramirez | Nicolas Ramirez | — | (925) 550 7017 | Other | Pittsburg · Contra Costa County | — | — |
| Nicole Welding INC | Blanca I Cruz Nicole | — | (925) 679 9636 | Other | Oakley · Contra Costa County | — | — |
| Nicoli Company | Donald John Nicoli | — | (925) 639 7146 | Electricians | Lafayette · Contra Costa County | — | — |
| Night Hawk Enterprises | Gino Ross Elliott | — | (510) 908 3310 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Niko's Plumbing | Nikolai Yurev | mail@nikosplumbing.com | (925) 655 7384 | Other | San Ramon · Contra Costa County | — | — |
| Nikola Tesla Electric | Kosta Marko Djordjevic | — | (925) 938 5572 | Electricians | Pleasant Hill · Contra Costa County | — | — |
| Nikolai Zvaritch | Nikolai Zvaritch | — | (630) 291 7546 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Nine County Builders LLC | Ernesto Cunningham | jsandoval@ninecountybuilders.com | (650) 293-7594 | GC, remodel, ADU | Brentwood · Contra Costa County | — | — |
| No Limit Rooter INC | Valencia Jesus Rodriguez | — | (415) 666 5547 | Other | El Sobrante · Contra Costa County | — | — |
| Noble Electric | Ashraf Hikmat Zeidan | interested@domainmarket.com | (925) 483 6886 | Electricians | Concord · Contra Costa County | — | — |
| Noble Insulation INC | Rami Odeh Khoury | — | (650) 608 0363 | Other | Richmond · Contra Costa County | — | — |
| Nol Construction Group INC | Matthew David Nolan | — | (415) 748 0923 | GC, remodel, ADU | Lafayette · Contra Costa County | — | — |
| Noor Electric | Bagheri Tadi Behroz | — | (925) 705 2405 | Electricians | Pleasant Hill · Contra Costa County | — | — |
| Nor - Cal Acoustics | Nor - Cal Acoustics | — | (925) 997 2450 | Other | Walnut Creek · Contra Costa County | — | — |
| Nor - Cal's Finest Construction & Development | Craig Donald Firkins | — | (925) 628 4855 | GC, remodel, ADU | Antioch · Contra Costa County | — | — |
| Nor Cal Waterproofing | Mateen Wahidi | — | (925) 303 2882 | Windows, patio, painters | Antioch · Contra Costa County | — | — |
| Nor Cal Wood Restoration & Painting | Carlin Blaine Robles | — | (415) 389 9663 | Windows, patio, painters | Richmond · Contra Costa County | — | — |
| Nor-cal Flooring | Nor-cal Flooring | — | (925) 998 1044 | Other | Discovery Bay · Contra Costa County | — | — |
| Nor-cal Overhead INC | William Andrew Mc Elmurry | bill@norcaloverhead.com | (650) 330-0047 | Other | Oakley · Contra Costa County | — | — |
| Nor-cal Painting | Nor-cal Painting | — | (510) 815 6773 | Windows, patio, painters | Pinole · Contra Costa County | — | — |
| Norbay Construction | Randhir Singh Bajwa | norbayconstruction@gmail.com | (925) 529-7359 | Electricians | San Pablo · Contra Costa County | — | — |
| Norcal Builder INC | Jose Ernesto Guardado Leiva | — | (510) 514 6956 | GC, remodel, ADU | San Pablo · Contra Costa County | — | — |
| Norcal Builders INC | Michael Timothy Barnes | — | (925) 679 8000 | GC, remodel, ADU | Brentwood · Contra Costa County | — | — |
| Norcal Construction | Christopher Daniel Quihuis | — | (408) 516 7112 | GC, remodel, ADU | Antioch · Contra Costa County | — | — |
| Norcal Demolition | Norcal Demolition | — | (510) 672 0504 | Other | Richmond · Contra Costa County | — | — |
| Norcal Fix It | Norcal Fix It | — | (925) 639 8238 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Norcal Hardwood Floors LLC | Anibal Isaac Alvarado | — | (650) 518 2293 | Other | Oakley · Contra Costa County | — | — |