| Joe Hinkey | Joe Hinkey | — | (916) 709 2292 | GC, remodel, ADU | Camptonville · Yuba County | — | — |
| Joe Turner Construction | Joseph Alvin Turner | — | (530) 218 8183 | GC, remodel, ADU | Marysville · Yuba County | — | — |
| John Ames Construction | John Collins Ames | — | (530) 300 6777 | GC, remodel, ADU | Browns Valley · Yuba County | — | — |
| John Gallagher Plastering | John Gallagher Plastering | — | (530) 592 7436 | GC, remodel, ADU | Oregon House · Yuba County | — | — |
| Johnny Blaze Electric | Jonathan Khaled Mokhtar | — | (559) 232 2285 | Electricians | Olivehurst · Yuba County | — | — |
| Jones Electric | Richard Carl Jones | — | (916) 751 8193 | Electricians | Plumas Lake · Yuba County | — | — |
| Jont'e Custom Flooring | Jont'e Custom Flooring | — | (707) 533 9397 | Other | Brownsville · Yuba County | — | — |
| Jr Squared Construction INC | Joseph Robert Ramus | — | (530) 277 6178 | GC, remodel, ADU | Smartsville · Yuba County | — | — |
| Jrv Construction | J Refugio Virgen | — | (530) 315 4436 | GC, remodel, ADU | Olivehurst · Yuba County | — | — |
| Jsa General Contractor INC | Jorge Jr Delatorre-Lopez | — | (916) 295 0253 | GC, remodel, ADU | Wheatland · Yuba County | — | — |
| Juan's Construction Service | Juan Ramon Guzman Perez | — | (209) 637 7688 | GC, remodel, ADU | Olivehurst · Yuba County | — | — |
| Juniper Tree Care INC | Juniper Tree Care INC | junipertreecareinc@outlook.com | (530) 930-0609 | Tree | Yuba City · Yuba County | — | — |
| Juston's Remodel And Restoration | Juston's Remodel And Restoration | — | (530) 202 5068 | GC, remodel, ADU | Marysville · Yuba County | — | — |
| K And S Construction | Jerry Lee Kersey | — | (530) 701 8003 | GC, remodel, ADU | Wheatland · Yuba County | — | — |
| Kap Engineering | Armando Raul Ruiz Barron | — | (916) 798 5514 | Other | Browns Valley · Yuba County | — | — |
| Keith Brown Drywall INC | Keith Mathew Brown | — | (530) 633 2102 | Windows, patio, painters | Wheatland · Yuba County | — | — |
| Kelly & Co Group | Michael Zimmerman | — | (530) 483 9127 | GC, remodel, ADU | Wheatland · Yuba County | — | — |
| Kinney Electric & Power Trans | Kinney Electric & Power Trans | — | (530) 673-3450 | Electricians | Yuba City · Yuba County | — | — |
| Kirkmans Custom Framing | Kirkmans Custom Framing | — | (530) 648 8126 | Other | Smartsville · Yuba County | — | — |
| Kt Concrete | Kt Concrete | — | (916) 606 6148 | Other | Olivehurst · Yuba County | — | — |
| L H L Construction INC | Lenond Wesley Lewis | — | (916) 782 9001 | GC, remodel, ADU | Olivehurst · Yuba County | — | — |
| L J Heating And Air Conditioning INC | Phillip Matthew Kester | — | (530) 301 9632 | HVAC | Marysville · Yuba County | — | — |
| Landa And Sons Glass Service | Landa And Sons Glass Service | — | (530) 861-6155 | Windows, patio, painters | Yuba City · Yuba County | — | — |
| Landscape Symphonies | Landscape Symphonies | — | (530) 632 3263 | Windows, patio, painters | Oregon House · Yuba County | — | — |
| Landscaping Solutions | Landscaping Solutions | — | (530) 682 2218 | Windows, patio, painters | Plumas Lake · Yuba County | — | — |
| Latham Irrigation | Latham Irrigation | — | (510) 830 6466 | Windows, patio, painters | Smartsville · Yuba County | — | — |
| Lathrop Tile & Stone INC | Justin Coldwell Lathrop | — | (916) 721 5600 | Other | Wheatland · Yuba County | — | — |
| Lauffs Pools & Supplies | Lauffs Pools & Supplies | — | (530) 673-4081 | Pool | Yuba City · Yuba County | — | — |
| Lawrence Vette Plumbing | Lawrence Vette Plumbing | — | (530) 415 9066 | Other | Browns Valley · Yuba County | — | — |
| Ledbetter Electric INC | Shaune Patrick Ledbetter | — | (530) 237 3288 | Electricians | Marysville · Yuba County | — | — |
| Ledbetter Mechanical Contracting LLC | Cody John Ledbetter | — | (916) 207 7052 | HVAC | Wheatland · Yuba County | — | — |
| Lee Bro's Construction | Michael Christopher Lee | — | (530) 682 1353 | GC, remodel, ADU | Marysville · Yuba County | — | — |
| Legacy Fence Construction And Repair INC | Steven Christopher Callahan | — | (916) 346 9604 | Other | Olivehurst · Yuba County | — | — |
| Leons Roofing | Marco Leon Carrillo | info@leonsroofing.com | (530) 216 0002 | Other roofers | Marysville · Yuba County | — | — |
| Liberato Tree Service Incorporated | Alfredo De Jesus Liberato Flores | — | (530) 441 4039 | Other | Marysville · Yuba County | — | — |
| Limitless Appliance Heating And Air | Limitless Appliance Heating And Air | — | (530) 763 7600 | HVAC | Marysville · Yuba County | — | — |
| Live Well Construction | Garay Gerardo Sandoval | — | (650) 716 3850 | GC, remodel, ADU | Olivehurst · Yuba County | — | — |
| Living Arts | Living Arts | tom@living-arts.com | (650) 537 0079 | Windows, patio, painters | Smartsville · Yuba County | — | — |
| Liviu Feceu | Liviu Feceu | — | (530) 300 2294 | Electricians | Marysville · Yuba County | — | — |
| Longs Custom Painting | Longs Custom Painting | — | (530) 635 4422 | Windows, patio, painters | Plumas Lake · Yuba County | — | — |