| Jason H Roland | Jason H Roland | — | (209) 768 8733 | GC, remodel, ADU | San Andreas · Calaveras County | — | — |
| Jeff Allen's Backhoe Service | Jeffrey W Allen | — | (209) 786 2633 | Other | Valley Springs · Calaveras County | — | — |
| Jeff Copeland Construction | Jeffrey Lincoln Copeland | — | (209) 768 3746 | GC, remodel, ADU | Arnold · Calaveras County | — | — |
| Jeff Nolan Construction | Jeffery Jon Nolan | — | (209) 419 1067 | GC, remodel, ADU | Murphys · Calaveras County | — | — |
| Jeff Womack Construction | Jeffrey Alan Womack | — | (209) 402 7204 | GC, remodel, ADU | Valley Springs · Calaveras County | — | — |
| Jeffrey A Davidson Const | Jeffrey A Davidson Const | — | (209) 471 9218 | GC, remodel, ADU | Valley Springs · Calaveras County | — | — |
| Jesse Brown Construction | Jesse Dylan Brown | — | (408) 316 6109 | GC, remodel, ADU | Arnold · Calaveras County | — | — |
| Jesse Wallace Contracting | Wallace Jesse | — | (209) 768 9807 | GC, remodel, ADU | Arnold · Calaveras County | — | — |
| Jim Cesario Painting | Jim Cesario Painting | — | (805) 406 0298 | Windows, patio, painters | Murphys · Calaveras County | — | — |
| Jim Payton Plumbing | Jim Payton Plumbing | — | (209) 629 9227 | Other | Angels Camp · Calaveras County | — | — |
| Jim Wilson Excavation | Jim Wilson Excavation | — | (209) 768 3909 | Other | Altaville · Calaveras County | — | — |
| Jk Shower Doors & Windows | Jk Shower Doors & Windows | — | (209) 256 2203 | Windows, patio, painters | Valley Springs · Calaveras County | — | — |
| Jlf Heating And Air INC | Rick William Jr Massella | — | (209) 293 4274 | HVAC | Glencoe · Calaveras County | — | — |
| Joe Medina Tile | Joe Medina Tile | — | (925) 594 0699 | Other | Valley Springs · Calaveras County | — | — |
| John Allen Construction | John Paul Jacob| Allen John Paul Jacob Allen | — | (209) 754 3799 | GC, remodel, ADU | San Andreas · Calaveras County | — | — |
| John Croll Construction | John Michael Croll | — | (510) 909 3883 | GC, remodel, ADU | Murphys · Calaveras County | — | — |
| John Daley | John Daley | — | (209) 769 1548 | Other | Valley Springs · Calaveras County | — | — |
| John E Musante Contracting | John Ernst Musante | — | (925) 708 2588 | GC, remodel, ADU | Valley Springs · Calaveras County | — | — |
| John Lenihan | John Lenihan | — | (650) 921 6669 | GC, remodel, ADU | Murphys · Calaveras County | — | — |
| John Losoya Construction INC | John Louis Losoya | — | (209) 785 8873 | GC, remodel, ADU | Copperopolis · Calaveras County | — | — |
| John Rancour | John Rancour | — | (408) 813 1587 | Other | Murphys · Calaveras County | — | — |
| John Shandel Construction | Steven Hans Shandel | — | (775) 340 4384 | Other | Valley Springs · Calaveras County | — | — |
| John W Hertzig | John W Hertzig | — | (209) 286 1234 | GC, remodel, ADU | Mokelumne Hill · Calaveras County | — | — |
| Jon Schuler | Jon Schuler | — | (770) 361 9450 | GC, remodel, ADU | Murphys · Calaveras County | — | — |
| Joseph W Senn Construction | Joseph Walter Senn | — | (209) 768 6166 | GC, remodel, ADU | Murphys · Calaveras County | — | — |
| Jr Construction | Jose Liduino Relva | — | (209) 756 1318 | GC, remodel, ADU | San Andreas · Calaveras County | — | — |
| Judd Bales Construction INC | Judd Douglas Bales | — | (209) 769 4599 | GC, remodel, ADU | Murphys · Calaveras County | — | — |
| Just - N - Time Painting | Lank Jr Rowland | — | (408) 483 7704 | Windows, patio, painters | San Andreas · Calaveras County | — | — |
| K And D Electric | Kenneth Raleigh Wright | — | (209) 256 0895 | Electricians | West Point · Calaveras County | — | — |
| K J M Enterprises | David Edward Brazie | — | (916) 716 0823 | Other | Copperopolis · Calaveras County | — | — |
| K W Emerson INC | Rusti Renee Emerson | — | (209) 754 3839 | Other | San Andreas · Calaveras County | — | — |
| Kannarr Elevator And Construction INC | Ethan S Kannarr | — | (209) 293 4569 | GC, remodel, ADU | West Point · Calaveras County | — | — |
| Kardas Construction Incorporated | Troy Michael Kardas | — | (209) 277 8023 | GC, remodel, ADU | Avery · Calaveras County | — | — |
| Keith's Painting | Keith's Painting | — | (209) 786 4045 | Windows, patio, painters | Valley Springs · Calaveras County | — | — |
| Kenny Link Construction | Kenneth Donald Link | — | (209) 293 4744 | GC, remodel, ADU | West Point · Calaveras County | — | — |
| Killip Pump Repair | Killip Pump Repair | — | (209) 256 1158 | Electricians | Mokelumne Hill · Calaveras County | — | — |
| Krause Fabrication INC | Jeremy Robert Krause | general@krausefabrication.com | (209) 754 9636 | Other | Valley Springs · Calaveras County | — | — |
| Lakeside Builder | Lakeside Builder | — | (209) 785 2334 | GC, remodel, ADU | Copperopolis · Calaveras County | — | — |
| Larry Collum Painting | Larry Collum Painting | — | (209) 768 6972 | Windows, patio, painters | Arnold · Calaveras County | — | — |
| Lawrence Baker | Lawrence Baker | — | (209) 728 1511 | Other | Murphys · Calaveras County | — | — |