| Naked Construction INC | Gregory Daniel Cromwell | — | (925) 818 2494 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Nance Painting | Nance Painting | — | (510) 303 1840 | Windows, patio, painters | Richmond · Contra Costa County | — | — |
| Nanco Construction Group INC | Jason Yen | — | (925) 200 0988 | GC, remodel, ADU | Lafayette · Contra Costa County | — | — |
| Narez General Engineering INC | Antonio Ordaz Narez | — | (925) 584 3149 | Other | Oakley · Contra Costa County | — | — |
| Narez Pool & Spa | Narez Pool & Spa | — | (925) 634 1057 | Electricians | Brentwood · Contra Costa County | — | — |
| Narvaez Painting INC | Carlos Martin Narvaez Ramirez | — | (408) 679 8703 | Windows, patio, painters | Pittsburg · Contra Costa County | — | — |
| Nash Construction | Christopher Mitchell Nash | — | (510) 965 5425 | GC, remodel, ADU | Richmond · Contra Costa County | — | — |
| Natalio Nicolas Drywall And Taping | Natalio Nicolas Drywall And Taping | — | (415) 686 8202 | Other | San Pablo · Contra Costa County | — | — |
| National Aquatic Services INC | Sean James Senior | — | (925) 513 9025 | Pool | Brentwood · Contra Costa County | — | — |
| National Building Specialties LLC | Kenneth Raymond Ruester | — | (714) 490 7361 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| National Tree & Garden Company | Jose I Villalobos | — | (925) 229 8365 | Windows, patio, painters | Martinez · Contra Costa County | — | — |
| Nativ Foundation INC | Dave Frank Wilber | office@nativfoundation.com | (725) 250 1326 | Other | Concord · Contra Costa County | — | — |
| Native Sons Landscaping Incorporated | Brent K Costa | — | (925) 837 8175 | GC, remodel, ADU | San Ramon · Contra Costa County | — | — |
| Natural Landscaping Contractors | Singh Paramjit | — | (925) 687 8926 | Windows, patio, painters | Concord · Contra Costa County | — | — |
| Nature Builder Landscape Construction LLC | Edward Glen Froeliger | — | (510) 704 3811 | Windows, patio, painters | Hercules · Contra Costa County | — | — |
| Nature's Blueprint Landscaping LLC | Denis Alexis Quijada Martinez | — | (925) 567 4066 | Windows, patio, painters | Bay Point · Contra Costa County | — | — |
| Nature's Reflections | Nature's Reflections | — | (925) 820 8567 | Pool | Brentwood · Contra Costa County | — | — |
| Natureworks | Roy Wesley Mark | — | (800) 758 7020 | Windows, patio, painters | Discovery Bay · Contra Costa County | — | — |
| Navarro Concrete Construction | Navarro Carlos | — | (415) 819 6164 | Other | Antioch · Contra Costa County | — | — |
| Navarro Iron Works | Navarro Iron Works | — | (510) 236 8061 | Other | San Pablo · Contra Costa County | — | — |
| Navarro Metal Works | Navarro Metal Works | — | (510) 313 8174 | Other | San Pablo · Contra Costa County | — | — |
| Navarro's Concrete | Navarro's Concrete | — | (925) 206 8241 | GC, remodel, ADU | Brentwood · Contra Costa County | — | — |
| Nb Landscape Pro | Nb Landscape Pro | info@ndiscovered.com | (925) 752 5920 | Windows, patio, painters | Pittsburg · Contra Costa County | — | — |
| Nbec LLC | Nikolaus Paul Bright | — | (510) 676 2988 | Electricians | Pleasant Hill · Contra Costa County | — | — |
| Nbn Painting | Nbn Painting | — | (925) 389 6880 | Windows, patio, painters | San Ramon · Contra Costa County | — | — |
| Nbs General Contractor INC | Ocegueda Jesus | — | (415) 420 0373 | GC, remodel, ADU | Pinole · Contra Costa County | — | — |
| Nc Roofing Solution INC | Bjorn James Metzger | — | (415) 755 5993 | Other roofers | Walnut Creek · Contra Costa County | — | — |
| Nci | Joseph William Iv Nehi | — | (925) 420 6206 | GC, remodel, ADU | Antioch · Contra Costa County | — | — |
| Ncm Construction | Martinez Norberto Calvo | — | (510) 837 5474 | GC, remodel, ADU | Richmond · Contra Costa County | — | — |
| Ncr Construction INC | Bernard Mark Nestal | — | (925) 254 3401 | GC, remodel, ADU | Orinda · Contra Costa County | — | — |
| Nd X Construction And Painting | Crespo Venustiano | — | (925) 382 3434 | GC, remodel, ADU | Antioch · Contra Costa County | — | — |
| Neal's Painting Company INC | Jerome Fredrick Neal | nealspainting-co@sbcglobal.net | (415) 515 8629 | Windows, patio, painters | Walnut Creek · Contra Costa County | — | — |
| Ned Clyde Construction INC | Jon Clyde Hagen | — | (925) 689 5411 | Other | Concord · Contra Costa County | — | — |
| Negotium Mulier INC | Alexander Josue Llamas | — | (925) 233 6877 | Other | Concord · Contra Costa County | — | — |
| Neil Baker Construction | Neil Edward Baker | — | (925) 708 3917 | GC, remodel, ADU | Pleasant Hill · Contra Costa County | — | — |
| Neil Howard Construction | Neil David Howard | — | (510) 260 7349 | GC, remodel, ADU | Pleasant Hill · Contra Costa County | — | — |
| Nelo's Construction INC | Jose Manuel Heredia | — | (925) 628 9527 | GC, remodel, ADU | Oakley · Contra Costa County | — | — |
| Nemanja Vorkapic DBA Electrical Co | Vorkapic Nemanja | — | (415) 548 3323 | Electricians | Concord · Contra Costa County | — | — |
| Nestforge INC | Pengli Zhao | — | (925) 586 3619 | GC, remodel, ADU | Lafayette · Contra Costa County | — | — |
| Net Energy INC | Nathaniel Elliott Tyler | — | (510) 315 1200 | Electricians | Richmond · Contra Costa County | — | — |