| Faytak Construction | Tyrone Edward Faytak | — | (530) 260 6507 | GC, remodel, ADU | Janesville · Lassen County | — | — |
| Flawless Floors | Flawless Floors | — | (707) 486 1622 | Other | Susanville · Lassen County | — | — |
| Frontier Builders | Jonathan Jay Nissley | — | (530) 520 6667 | GC, remodel, ADU | Janesville · Lassen County | — | — |
| Gold Run Cabinet Company | Maurice John Barnetche | — | (530) 251 4653 | Other | Susanville · Lassen County | — | — |
| Gold Run Construction | Clayton Dean Gunderson | — | (530) 310 2012 | GC, remodel, ADU | Susanville · Lassen County | — | — |
| Greg Lopez Construction INC | Lopez Gregory | greglopez2019@gmail.com | (530) 596 4111 | GC, remodel, ADU | Lake Almanor · Lassen County | — | — |
| Guess Plumbing & Supply INC | Jeffrey-Scott Warren Guess | — | (530) 310 3180 | Other | Susanville · Lassen County | — | — |
| Halverson Construction | Edward Lynn Halverson | — | (530) 310 4561 | GC, remodel, ADU | Lake Almanor · Lassen County | — | — |
| Harlans Bobcat/b-hoe Service | Randy Lee Harlan | — | (530) 310 0150 | Other | Janesville · Lassen County | — | — |
| High Desert Home Inspections | High Desert Home Inspections | hello@rfuenzalida.com | (760) 851-8827 | Inspectors | Susanville · Lassen County | — | — |
| Holt Logging INC | Casey J Holt | — | (530) 256 3104 | Tree | Westwood · Lassen County | — | — |
| Homme's Landscape | Homme's Landscape | — | (530) 258 3534 | Windows, patio, painters | Susanville · Lassen County | — | — |
| Horsley Construction Co | Daron Scott Horsley | — | (530) 310 5555 | GC, remodel, ADU | Susanville · Lassen County | — | — |
| House Of Custom Cabinets | House Of Custom Cabinets | — | (530) 596 3725 | Other | Westwood · Lassen County | — | — |
| J & J Builders L.l.c. | Jason Allen Wattenburg | — | (530) 249 6132 | GC, remodel, ADU | Susanville · Lassen County | — | — |
| J M A Painting | J M A Painting | — | (530) 260 2288 | Windows, patio, painters | Westwood · Lassen County | — | — |
| J M Fisher Electric | John Marshall Fisher | — | (530) 256 3072 | Electricians | Westwood · Lassen County | — | — |
| Jade Construction | Guy Lewis Shively | — | (530) 816 2596 | GC, remodel, ADU | Susanville · Lassen County | — | — |
| Jason Colbert | Jason Colbert | — | (530) 310 0354 | Other roofers | Susanville · Lassen County | — | — |
| Jensen Drywall Works | Jensen Drywall Works | — | (707) 718 0497 | Other | Janesville · Lassen County | — | — |
| Jesse Rettig Construction | Jesse Frederick Rettig | — | (925) 964 3050 | GC, remodel, ADU | Westwood · Lassen County | — | — |
| Jm Plumbing | Jm Plumbing | — | (530) 260 8006 | Other | Susanville · Lassen County | — | — |
| Jmh Construction Services INC | John Michael Henneman | — | (530) 263 1706 | GC, remodel, ADU | Janesville · Lassen County | — | — |
| Joe Branch Electric INC | Joseph Amedeo Sr Branch | — | (530) 596 4900 | Electricians | Westwood · Lassen County | — | — |
| Joe Tantardino Logging INC | Joseph Scott Tantardino | — | (530) 596 4539 | Tree | Lake Almanor · Lassen County | — | — |
| John J Valentich Construction | John James Valentich | — | (530) 310 1096 | GC, remodel, ADU | Susanville · Lassen County | — | — |
| Jon Rolland | Jon Rolland | — | (530) 252 4783 | GC, remodel, ADU | Susanville · Lassen County | — | — |
| Jts Underground | Jts Underground | — | (530) 249 4643 | Other | Susanville · Lassen County | — | — |
| Kellogg Construction | Timothy Robert Kellogg | info@kellogg-construction.com | (530) 253 2209 | GC, remodel, ADU | Janesville · Lassen County | — | — |
| Kenneth Johnston Construction Company | Kenneth Alexander Johnston | — | (530) 249 6070 | GC, remodel, ADU | Susanville · Lassen County | — | — |
| Kent House Construction | Kent Frank House | — | (530) 524 6695 | GC, remodel, ADU | Bieber · Lassen County | — | — |
| Kings Backhoe & Welldrilling | Kings Backhoe & Welldrilling | — | (530) 519 0500 | Other | Nubieber · Lassen County | — | — |
| Kirby Tree Service | Ray Adam Kirby | — | (530) 258 7926 | Other | Westwood · Lassen County | — | — |
| Krause Construction | Jeffrey Scott Krause | — | (916) 743 8078 | GC, remodel, ADU | Janesville · Lassen County | — | — |
| L K & B Construction | Pete David Dunham | — | (916) 275 3157 | Other | Westwood · Lassen County | — | — |
| Lassen Economic Development Corporation | Tifini Ann Powers | — | (530) 256 3531 | GC, remodel, ADU | Westwood · Lassen County | — | — |
| Lawrence And Associates | Lawrence And Associates | — | (760) 717-3700 | Property managers | Vista · Lassen County | — | — |
| Lawrence Electric | Lawrence Electric | — | (760) 726-6168 | Electricians | Vista · Lassen County | — | — |
| Legacy Building And Exteriors | Jeremiah Benjamin Shihadeh | — | (530) 260 6848 | GC, remodel, ADU | Janesville · Lassen County | — | — |
| Lemaster Tree Service | Philip Edward Nicho Lemaster | p.lemaster@hotmail.com | (530) 616 9075 | Tree | Westwood · Lassen County | — | — |