| B S Fabrication | B S Fabrication | — | (530) 598 5251 | Other | Yreka · Siskiyou County | — | — |
| Badger Electric INC | Jorge Luis Calderon | — | (707) 254 5513 | Electricians | Mt Shasta · Siskiyou County | — | — |
| Barn Builders Plus | Barn Builders Plus | — | (530) 598 1976 | GC, remodel, ADU | Yreka · Siskiyou County | — | — |
| Basic Fencing INC | John Clarence York | — | (530) 842 2915 | Other | Yreka · Siskiyou County | — | — |
| Beale Mechanical | Beale Mechanical | — | (415) 246 8989 | HVAC | Dunsmuir · Siskiyou County | — | — |
| Beaver Valley Construction | William Paul Freckman | — | (530) 598 2000 | GC, remodel, ADU | Fort Jones · Siskiyou County | — | — |
| Ben Vincent's Plumbing Service | Benjamin Ryan Vincent | — | (530) 926 2200 | Other | Mt Shasta · Siskiyou County | — | — |
| Benjamin Ceraso Construction | Benjamin Alexander Ceraso | — | (530) 643 3543 | GC, remodel, ADU | Yreka · Siskiyou County | — | — |
| Berryhill Builders | Berryhill Builders | — | (530) 340 2324 | GC, remodel, ADU | Greenview · Siskiyou County | — | — |
| Berryhill Contracting INC | Kenneth Alan Berryhill | — | (530) 467 3641 | Other | Etna · Siskiyou County | — | — |
| Better Homes + Construction INC | Scott Anthony Dolf | — | (530) 925 6827 | GC, remodel, ADU | Dunsmuir · Siskiyou County | — | — |
| Big Dave's Construction INC | David Ralph Keisler | — | (530) 925 9365 | GC, remodel, ADU | Dunsmuir · Siskiyou County | — | — |
| Black Butte Tree Service LLC | John Charles Mcguire | — | (703) 674 8262 | Other | Mt Shasta · Siskiyou County | — | — |
| Bob Johnson Construction | Robert Thomas Johnson | — | (530) 598 4911 | Other | Yreka · Siskiyou County | — | — |
| Boncella Excavation | Boncella Excavation | — | (530) 842 1946 | Other | Yreka · Siskiyou County | — | — |
| Boudro Construction | Vernon Gene Boudro | — | (530) 598 1580 | Other | Greenview · Siskiyou County | — | — |
| Boyd Construction Company | Edward Mccormick Boyd | — | (541) 551 0197 | GC, remodel, ADU | Weed · Siskiyou County | — | — |
| Brad De Bortoli | Brad De Bortoli | — | (530) 261 1465 | GC, remodel, ADU | Mt Shasta · Siskiyou County | — | — |
| Bradleys Painting | Bradleys Painting | — | (760) 672 5640 | Windows, patio, painters | Yreka · Siskiyou County | — | — |
| Brendan B Bowling | Brendan B Bowling | — | (530) 340 1790 | Other | Montague · Siskiyou County | — | — |
| Brian Nowdesha Masonry | Brian Nowdesha Masonry | — | (530) 340 5415 | Other | Weed · Siskiyou County | — | — |
| Brian The House Doctor | Brian The House Doctor | — | (530) 859 0357 | GC, remodel, ADU | Weed · Siskiyou County | — | — |
| Brooks Drywall | Brooks Drywall | — | (707) 696 0165 | Other | Montague · Siskiyou County | — | — |
| Buchin Construction | John Forrest Buchin | — | (530) 784 3268 | GC, remodel, ADU | Fort Jones · Siskiyou County | — | — |
| Burfield Engineering | Burfield Engineering | — | (408) 656 4855 | Other | Mount Shasta · Siskiyou County | — | — |
| Buzy Bee Paving Co | Jeffrey Michael Fortner | info@buzybeepaving.com | (530) 926 0897 | Other | Mt Shasta · Siskiyou County | — | — |
| Caddell Construction | Zachary Bernard Caddell | interested@domainmarket.com | (530) 340 2423 | GC, remodel, ADU | Mt Shasta · Siskiyou County | — | — |
| Callahan Home Improvements | Callahan Home Improvements | — | (530) 467 5821 | GC, remodel, ADU | Callahan · Siskiyou County | — | — |
| Campbell Grading INC | Barth Charles Campbell | — | (530) 468 4226 | Other | Fort Jones · Siskiyou County | — | — |
| Carlson's Construction INC | Curt Wayne Carlson | — | (530) 598 4640 | Other | Yreka · Siskiyou County | — | — |
| Cascade Glass Co | Guy Louis Crispi | john@doe.com | (530) 926 2346 | Windows, patio, painters | Mt Shasta · Siskiyou County | — | — |
| Casey Wade Conner DBA Eddie Conner | Conner Eddie | — | (530) 496 3115 | Other | Klamath River · Siskiyou County | — | — |
| Cattanach Construction Company INC | Cameron John Cattanach | — | (530) 356 5230 | GC, remodel, ADU | Mount Shasta · Siskiyou County | — | — |
| Chavez Construction Company | Francisco Javier Chavez | — | (530) 643 1057 | GC, remodel, ADU | Montague · Siskiyou County | — | — |
| Chris Parker Construction Company | Christopher Bernard Parker | — | (530) 598 4769 | GC, remodel, ADU | Mt Shasta · Siskiyou County | — | — |
| Christopher Maniatis | Christopher Maniatis | — | (510) 326 4726 | GC, remodel, ADU | Mt Shasta · Siskiyou County | — | — |
| Clark Creek Construction | John Thomas Murray | — | (530) 598 6878 | GC, remodel, ADU | Etna · Siskiyou County | — | — |
| Clark Property Services | Robert Andrew Clark | — | (650) 504 0112 | GC, remodel, ADU | Mount Shasta · Siskiyou County | — | — |
| Clark Woodworking | Clark Woodworking | — | (530) 925 2320 | Electricians | Weed · Siskiyou County | — | — |
| Clint Johnson Construction INC | Clint Joseph Johnson | — | (530) 598 5301 | GC, remodel, ADU | Callahan · Siskiyou County | — | — |