| J C Enterprises | Chesley Leon Lackey | sales@jcenterprises.com | (530) 362 6709 | GC, remodel, ADU | Grass Valley · Nevada County | — | — |
| J Carmen Paniagua Olivas | J Carmen Paniagua Olivas | — | (530) 448 0769 | Other | Truckee · Nevada County | — | — |
| J Chris Bozarth | J Chris Bozarth | — | (530) 277 0291 | GC, remodel, ADU | Grass Valley · Nevada County | — | — |
| J Christopher Co | James Christopher Flaherty | — | (530) 273 0249 | GC, remodel, ADU | Grass Valley · Nevada County | — | — |
| J D M Construction | James David Moran | — | (530) 559 8630 | GC, remodel, ADU | Nevada City · Nevada County | — | — |
| J Dixon Construction | Jerry Dean Dixon | — | (925) 783 5535 | GC, remodel, ADU | Nevada City · Nevada County | — | — |
| J K Construction | Jonathan Steven Kane | jk@jkconstruction.com | (530) 412 0671 | GC, remodel, ADU | Truckee · Nevada County | — | — |
| J L C Group INC | John Edward Hagen | — | (530) 362 0275 | GC, remodel, ADU | Cedar Ridge · Nevada County | — | — |
| J L Raupp Co INC | Jonathan Lee Raupp | — | (530) 277 3107 | GC, remodel, ADU | Nevada City · Nevada County | — | — |
| J M Electric | Juan Manuel Parra Aguilar | — | (530) 414 6786 | Electricians | Truckee · Nevada County | — | — |
| J M Plumbing | J M Plumbing | — | (530) 265 9142 | Other | Nevada City · Nevada County | — | — |
| J M Top Quality Roofing | Joel James Megill | — | (530) 263 4360 | Other roofers | Grass Valley · Nevada County | — | — |
| J Mccune Construction INC | Jonathan Michael Mccune | — | (530) 205 5764 | GC, remodel, ADU | Penn Valley · Nevada County | — | — |
| J N Flooring | J N Flooring | — | (530) 414 3817 | Other | Truckee · Nevada County | — | — |
| J P Prince INC DBA Prince Electric Truckee | James Peter Prince | — | (530) 412 3035 | Electricians | Truckee · Nevada County | — | — |
| J R Sharp Construction INC | John Randall Sharp | — | (530) 346 6016 | Electricians | Grass Valley · Nevada County | — | — |
| J S Const | J S Const | — | (530) 913 0862 | GC, remodel, ADU | Nevada City · Nevada County | — | — |
| J S Construction | Jesus Dodni Sandoval | — | (530) 648 4695 | GC, remodel, ADU | Penn Valley · Nevada County | — | — |
| J S M Construction | Jeffrey Scott Morris | — | (530) 272 6665 | GC, remodel, ADU | Grass Valley · Nevada County | — | — |
| J S Munoz Construction | Jeremy Seth Munoz | — | (808) 754 8553 | GC, remodel, ADU | Grass Valley · Nevada County | — | — |
| J S Renwick Construction | John Sheldon Renwick | — | (530) 682 3000 | GC, remodel, ADU | Grass Valley · Nevada County | — | — |
| J T R Plumbing | J T R Plumbing | — | (408) 832 1990 | Other | Penn Valley · Nevada County | — | — |
| J W Construction | Jerry Michael Wilson | — | (530) 263 5400 | Electricians | Grass Valley · Nevada County | — | — |
| J W H Construction | James Willard Haan | — | (925) 209 5148 | GC, remodel, ADU | Penn Valley · Nevada County | — | — |
| J W Structures | J W Structures | — | (530) 308 4605 | GC, remodel, ADU | Truckee · Nevada County | — | — |
| J&c Engineering INC | Jonathan Daya Pradhan | — | (530) 388 8755 | Other | Grass Valley · Nevada County | — | — |
| J-bilt Distintive Homes | J-bilt Distintive Homes | — | (530) 587 3089 | GC, remodel, ADU | Truckee · Nevada County | — | — |
| Jaborski Construction INC | Matthew Wayne Jaborski | — | (530) 426 3726 | GC, remodel, ADU | Soda Springs · Nevada County | — | — |
| Jacobs Custom Homes INC | Timmy Marlon Jacobs | — | (530) 913 3004 | GC, remodel, ADU | Cedar Ridge · Nevada County | — | — |
| Jacobson Construction INC | Bo Alexander Jacobson | — | (530) 559 9098 | GC, remodel, ADU | Grass Valley · Nevada County | — | — |
| Jada INC | Aaron Francis Beyer | — | (530) 265 5354 | Windows, patio, painters | Grass Valley · Nevada County | — | — |
| James A Graham | James A Graham | — | (530) 308 2476 | GC, remodel, ADU | Penn Valley · Nevada County | — | — |
| James A Sepeda | James A Sepeda | — | (530) 362 0211 | GC, remodel, ADU | Grass Valley · Nevada County | — | — |
| James Barsotti Contracting | James Leo Barsotti | — | (530) 277 3262 | Electricians | Nevada City · Nevada County | — | — |
| James Edwards | James Edwards | — | (530) 308 6238 | GC, remodel, ADU | Grass Valley · Nevada County | — | — |
| James Francis Haag | James Francis Haag | — | (714) 231 5385 | GC, remodel, ADU | Grass Valley · Nevada County | — | — |
| James K Becker Construction | James Kenneth Becker | — | (530) 913 3496 | GC, remodel, ADU | Penn Valley · Nevada County | — | — |
| James Koblick Construction | James Gregory Koblick | — | (541) 954 7788 | GC, remodel, ADU | Truckee · Nevada County | — | — |
| James Manetta Cabinet Maker | James Manetta Cabinet Maker | — | (530) 913 3069 | Other | Truckee · Nevada County | — | — |
| James Seely INC | James Garretson Seely | — | (530) 263 7708 | GC, remodel, ADU | Grass Valley · Nevada County | — | — |