| Norcal Lifting And Repairs INC | Joshua Adam Reeves | — | (916) 201 4318 | Other | Brentwood · Contra Costa County | — | — |
| Norcal Ornamental | Norcal Ornamental | — | (510) 395 6263 | Other | El Sobrante · Contra Costa County | — | — |
| Norcal Pro Construction And Remodeling INC | Joshua Dean Bradley | — | (510) 606 2410 | GC, remodel, ADU | Antioch · Contra Costa County | — | — |
| Norcal Supreme Builder | Norcal Supreme Builder | — | (925) 522 9973 | GC, remodel, ADU | Knightsen · Contra Costa County | — | — |
| Norcal Voice And Data | Norcal Voice And Data | — | (925) 250 9021 | Other | Concord · Contra Costa County | — | — |
| Nordic General Building Contractor | Nordic General Building Contractor | — | (925) 408 7718 | GC, remodel, ADU | Clayton · Contra Costa County | — | — |
| Norm Oldroyd Concrete | Norm Oldroyd Concrete | — | (925) 383 5599 | Other | Danville · Contra Costa County | — | — |
| Norried's INC | Jonathan David Norried | — | (925) 765 2345 | Windows, patio, painters | Martinez · Contra Costa County | — | — |
| Norseman Electric | Darryl Vincent Johnson | — | (925) 871 2220 | Electricians | Lafayette · Contra Costa County | — | — |
| North Bay Inspection | North Bay Inspection | — | (707) 649-8700 | Inspectors | Concord · Contra Costa County | — | — |
| North Bay Paver Stone INC | Oscar Uriel Lugo Reyes | — | (510) 965 8989 | Other | Richmond · Contra Costa County | — | — |
| North Berkeley Construction Co | Ronald William Villanueva | — | (415) 240 0304 | GC, remodel, ADU | Lafayette · Contra Costa County | — | — |
| North By West Construction INC | Nathanael Whalen Jones | info@northbywestconstruction.com | (510) 239 5519 | GC, remodel, ADU | Martinez · Contra Costa County | — | — |
| North Cal Garage Doors | North Cal Garage Doors | — | (925) 315 9989 | Other | Pittsburg · Contra Costa County | — | — |
| North Gate Plumbing INC | Yulia Alperov | support@northgateplumbing.com | (818) 635 7015 | Other | Oakley · Contra Costa County | — | — |
| North Pacific Builders | Santos Gesser Dos | — | (415) 410 6473 | GC, remodel, ADU | Oakley · Contra Costa County | — | — |
| North Point Construction And Restoration INC | Cagney Mark Brown | — | (925) 308 0254 | GC, remodel, ADU | Brentwood · Contra Costa County | — | — |
| North Power Construction INC | Ludwing Adalberto Rodriguez Borrayo | — | (341) 600 8654 | GC, remodel, ADU | Bay Point · Contra Costa County | — | — |
| North Richmond Economic Development Corporation | Samuel Shane Sutherland | — | (510) 412 9290 | GC, remodel, ADU | Richmond · Contra Costa County | — | — |
| North Star Floors INC | Brian Ross Blankenship | — | (925) 595 5262 | Other | Oakley · Contra Costa County | — | — |
| North Star Heating & Cooling | Kyrylo Kryvytskyi | — | (925) 378 8529 | HVAC | Walnut Creek · Contra Costa County | — | — |
| North Valley Construction Company | Barry Mathew Meals | — | (925) 698 2334 | GC, remodel, ADU | Brentwood · Contra Costa County | — | — |
| Northern Directional Drilling INC | Thomas Anatol Demus | — | (925) 522 8880 | Other | Oakley · Contra Costa County | — | — |
| Northern Landscape Management INC | Danielle Carlene Keeling | — | (510) 777 0110 | Windows, patio, painters | Danville · Contra Costa County | — | — |
| Northern Lights Electric INC | Richard Bradly Gobbell | — | (925) 766 6905 | Electricians | Danville · Contra Costa County | — | — |
| Northgate Landscape Management | Northgate Landscape Management | — | (925) 240 0739 | Windows, patio, painters | Byron · Contra Costa County | — | — |
| Northgate Painting & Decorating | Northgate Painting & Decorating | — | (925) 372 8993 | Windows, patio, painters | Martinez · Contra Costa County | — | — |
| Northgate Remodeling Company LLC | Jonathan Franci Quesada Gomez | info@northgateremodeling.com | (925) 464 3027 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Northington Innovations INC | Jeffrey Allan Northington | — | (925) 957 0200 | GC, remodel, ADU | Martinez · Contra Costa County | — | — |
| Northstar Home Remodeling | Northstar Home Remodeling | — | (925) 382 7800 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Northstar Solar INC | Ryan Thomas Burns | — | (925) 400 7479 | Other roofers | Danville · Contra Costa County | — | — |
| Northwest Builders & Renovation LLC | Ruelas Hilario Flores | — | (253) 433 1478 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Noske Construction | Paul Augoustovichjr Noske | — | (650) 826 6001 | GC, remodel, ADU | Danville · Contra Costa County | — | — |
| Not My Honey Do | Dennis Steven Costanza | — | (925) 260 6328 | GC, remodel, ADU | Pittsburg · Contra Costa County | — | — |
| Nouveau Construction LLC | Gerardo Alejandro Salazar | — | (415) 535 3386 | GC, remodel, ADU | San Pablo · Contra Costa County | — | — |
| Nova Construction INC | Inon Meir Sr Cohen | — | (925) 639 3177 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Nova Electric | Rodney Paul Raumer | — | (707) 712 1970 | Electricians | El Sobrante · Contra Costa County | — | — |
| Novare Developments | Mike Nelson Rowland | — | (415) 763 1680 | GC, remodel, ADU | Brentwood · Contra Costa County | — | — |
| Novin Construction INC | Yeris Alfrancis Paredes Zuniga | — | (925) 344 6244 | Electricians | Walnut Creek · Contra Costa County | — | — |
| Novus Glass | Gary Joseph Neves | — | (925) 969 0201 | Windows, patio, painters | Concord · Contra Costa County | — | — |