| Netxperts LLC | Johnny Harold Lieberman | — | (925) 806 0800 | Electricians | Concord · Contra Costa County | — | — |
| Neumann Construction Co | Martin Bernd Neumann | — | (925) 989 3143 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| New Bay Construction Co | Andrew Michael Pereira | — | (925) 783 6590 | GC, remodel, ADU | Brentwood · Contra Costa County | — | — |
| New Beginnings Construction | Mark Allen Larson | — | (925) 943 2143 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| New Century Construction | Daniel Lewis Pintarich | — | (925) 200 0335 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| New Century Roofing & Electric INC | Victor Chun Su | — | (415) 802 9208 | Other roofers | Antioch · Contra Costa County | — | — |
| New Core Construction | Miguel Angel Velazquez Arredondo | newcoreconstruction@icloud.com | (415) 450 7734 | GC, remodel, ADU | Richmond · Contra Costa County | — | — |
| New Dimensions Construction | Devon Quentin Allred | — | (925) 260 4727 | GC, remodel, ADU | Danville · Contra Costa County | — | — |
| New Edge Construction INC DBA New Edge Concrete | Jose Ernesto Rosales | — | (510) 478 7007 | Other | Richmond · Contra Costa County | — | — |
| New Era 2000 | New Era 2000 | — | (415) 720 4985 | Windows, patio, painters | Richmond · Contra Costa County | — | — |
| New Image Landscaping | New Image Landscaping | — | (925) 437 6389 | Windows, patio, painters | Bay Point · Contra Costa County | — | — |
| New Improvement Construction | Leung Alan Loon Wai | — | (415) 828 9085 | GC, remodel, ADU | El Sobrante · Contra Costa County | — | — |
| New Key Construction | Reggie Alan Keding | info@newkeyconstruction.com | (925) 954 8731 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| New Life Tree Service | Jose Duane Flores Morales | — | (925) 252 6389 | Tree | Oakley · Contra Costa County | — | — |
| New Look Exteriors | New Look Exteriors | — | (773) 742 1424 | Windows, patio, painters | Pittsburg · Contra Costa County | — | — |
| New Look Landscaping | James Mitchell Kalberer | — | (925) 567 6702 | Windows, patio, painters | Antioch · Contra Costa County | — | — |
| New Look Painting & Decorating INC | Randy A Lee Hawthorne | — | (925) 825 1767 | Windows, patio, painters | Concord · Contra Costa County | — | — |
| New Vision Flooring | New Vision Flooring | — | (415) 685 9684 | Other | Antioch · Contra Costa County | — | — |
| New West Builders LLC | Joshua Micheal West | — | (925) 377 7700 | GC, remodel, ADU | Orinda · Contra Costa County | — | — |
| New West Landscape Management INC | Adrian Alba Martinez | — | (925) 969 9460 | Windows, patio, painters | Concord · Contra Costa County | — | — |
| Newcastle Const | Newcastle Const | — | (415) 872 6120 | GC, remodel, ADU | Danville · Contra Costa County | — | — |
| Newcastle Pavers Interlock Services | Hudson Alves Rezende | — | (510) 685 4217 | Other | Richmond · Contra Costa County | — | — |
| Newsom Construction Co | Charles Henry Newsom | ricknewsom61@hotmail.com | (916) 628-0735 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Nexo Construction | Navid Firooz | construction.nexo@gmail.com | (510) 529 6960 | GC, remodel, ADU | Richmond · Contra Costa County | — | — |
| Nexphase Home Improvement LLC | Scott Francis Lohman | — | (925) 286 0066 | GC, remodel, ADU | Lafayette · Contra Costa County | — | — |
| Next Generation Flooring 2K INC | Luis Antonio Irizarry | — | (925) 382 4212 | Other | Oakley · Contra Costa County | — | — |
| Next Generation Plumbing LLC | Evangelos Dimitrios Gikas | — | (925) 250 7583 | Other | Oakley · Contra Costa County | — | — |
| Next Generation Tile | Next Generation Tile | — | (510) 541 5514 | Other | El Sobrante · Contra Costa County | — | — |
| Next Level Homes INC | Jared Davis Nielsen | interested@domainmarket.com | (925) 330 6858 | GC, remodel, ADU | Oakley · Contra Costa County | — | — |
| Next Phase Construction INC | Andy Lee Davidson | — | (925) 412 4852 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Next Step Audio And Video | Next Step Audio And Video | — | (510) 473 2887 | Other | Concord · Contra Costa County | — | — |
| Nextenergy | Robert Lavern Halk | — | (800) 600 8171 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Nextlevel Builders | Enkhamgalan Baatar | pacificwind2020@gmail.com | (510) 816 6756 | GC, remodel, ADU | Moraga · Contra Costa County | — | — |
| Nextline Electric INC | Hector Jesus Solorzano_solis | — | (510) 838 6962 | Electricians | Richmond · Contra Costa County | — | — |
| Nextphase Builders INC | Zaragoza Horacio Ochoa | — | (925) 639 8247 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Ng Construction | Grcic Nikola | — | (415) 966 8388 | Electricians | Martinez · Contra Costa County | — | — |
| Ngb Contractor INC | Noe Gerardo Sr Barragan Medina | — | (510) 779 7641 | GC, remodel, ADU | Richmond · Contra Costa County | — | — |
| Nh Painting INC | Robert David Serkiz | — | (925) 382 4165 | Windows, patio, painters | Discovery Bay · Contra Costa County | — | — |
| Nica Sidewall Shingling | Nica Sidewall Shingling | nicashingle@gmail.com | (510) 593 7168 | Windows, patio, painters | Pittsburg · Contra Costa County | — | — |
| Nice & Better Builder | Nice & Better Builder | — | (415) 308 5069 | GC, remodel, ADU | Concord · Contra Costa County | — | — |