| Shingle Shield Usa | Bruce Kenton Gregory | — | (530) 524 9914 | GC, remodel, ADU | Anderson · Shasta County | — | — |
| Shufelberger Construction INC | Sherry Lynn Shufelberger | — | (530) 221 8555 | GC, remodel, ADU | Redding · Shasta County | — | — |
| Sierra Painting | Sierra Painting | — | (530) 275 6435 | Windows, patio, painters | Shasta Lake · Shasta County | — | — |
| Sierra Vista Vegetation Removal And Tree Service | David Michael Papcke | — | (530) 524 4666 | Tree | Anderson · Shasta County | — | — |
| Signature Gates And Controls | Michael James Barbre | — | (530) 378 0400 | Other | Bella Vista · Shasta County | — | — |
| Silverado Restoration Company INC | Jason Madrone Toombs | — | (530) 515 0565 | GC, remodel, ADU | Redding · Shasta County | — | — |
| Silverleaf Dustless Wood Floor Sanding & Refinishing INC | Marc Duclos | — | (530) 806 3898 | Other | Redding · Shasta County | — | — |
| Silverline Pacific | Carl Duane Smith | — | (530) 227 8086 | Windows, patio, painters | Redding · Shasta County | — | — |
| Silverline Seamless LLC | David R Holcombe | dave@silverlineseamless.com | (530) 262 3228 | Other | Anderson · Shasta County | — | — |
| Simmons Construction | David Paul Simmons | — | (530) 410 8172 | GC, remodel, ADU | Cottonwood · Shasta County | — | — |
| Simmons Plumbing | Simmons Plumbing | — | (530) 366 8190 | Other | Fall River Mills · Shasta County | — | — |
| Simonis Concrete | Simonis Concrete | — | (530) 355 2103 | Other | Cottonwood · Shasta County | — | — |
| Simplicity Flooring And Tile INC | Walter William Jr Carney | — | (530) 378 1176 | Other | Anderson · Shasta County | — | — |
| Sims Construction | Robert Ralph Sims | — | (530) 945 5938 | GC, remodel, ADU | Shingletown · Shasta County | — | — |
| Sims Construction | Jonathon Chipper Sims | — | (530) 227 9375 | Electricians | Mc Arthur · Shasta County | — | — |
| Sinclair Pump And Electric | Donald Mackenzie Ii Sinclair | — | (530) 474 4601 | Electricians | Shingletown · Shasta County | — | — |
| Siskiyou Association Of Realtors | Siskiyou Association Of Realtors | — | (530) 926-5083 | Property managers | Mt Shasta · Shasta County | — | — |
| Siskiyou Inspection LLC | Siskiyou Inspection LLC | — | (530) 925-3147 | Pest, tile roofs | Mt Shasta · Shasta County | — | — |
| Site Work Solutions | George Daniel Whitmer | — | (530) 222 2229 | GC, remodel, ADU | Redding · Shasta County | — | — |
| Sjpc INC DBA Stan Johnson Pool Construction | Stanley Wayne Johnson | — | (707) 396 1997 | Pool | Millville · Shasta County | — | — |
| Skaggs Construction | Bradley Charles Skaggs | — | (530) 515 2549 | GC, remodel, ADU | Shasta Lake · Shasta County | — | — |
| Sky's Hauling & Removal | Sky's Hauling & Removal | — | (530) 215 7863 | Other | Redding · Shasta County | — | — |
| Skyline Roofing | Cody Michael Lucero | luceroconstruction@outlook.com | (530) 710 4951 | Other roofers | Shasta Lake · Shasta County | — | — |
| Smart & Final Extra! | Smart & Final Extra! | — | (760) 753-6760 | Pest, tile roofs | Encinitas · Shasta County | — | — |
| Smith And Sons | Taylor James Smith | — | (530) 360 2311 | GC, remodel, ADU | Anderson · Shasta County | — | — |
| Smithworks | Adam Ross Smith | — | (530) 515 7741 | Other | Anderson · Shasta County | — | — |
| Snapps Construction INC | Andrew Lawrence Stonelake | — | (530) 262 8680 | GC, remodel, ADU | Redding · Shasta County | — | — |
| Snavely - Morley Construction | James Martin Morley | — | (530) 246 3127 | GC, remodel, ADU | Redding · Shasta County | — | — |
| Snl Group INC | Eric Lynn Stephens | — | (530) 222 5048 | GC, remodel, ADU | Redding · Shasta County | — | — |
| Snyder's Plumbing And Pumps | Snyder's Plumbing And Pumps | — | (530) 941 5297 | Other | Redding · Shasta County | — | — |
| Solid Rock Construction INC | Richard Joe Smith | info@solidrockconstruction.com | (530) 378 0373 | Other | Redding · Shasta County | — | — |
| South Siskiyou Property Guide | South Siskiyou Property Guide | — | (530) 926-3481 | Property managers | Mt Shasta · Shasta County | — | — |
| Spalding Construction | Richard Glen Spalding | — | (530) 945 5979 | GC, remodel, ADU | Mc Arthur · Shasta County | — | — |
| Speed's Painting INC | Harold Louis Mawson | — | (530) 949 2663 | Windows, patio, painters | Redding · Shasta County | — | — |
| Sprague Roofing | Richard Allen Jr Sprague | — | (530) 945 2116 | Other roofers | Cottonwood · Shasta County | — | — |
| Spratt Excavating | Spratt Excavating | — | (530) 604 2819 | Other | Cottonwood · Shasta County | — | — |
| St Nicholas Construction | Steven Thomas Nicholas | — | (530) 510 5886 | GC, remodel, ADU | Redding · Shasta County | — | — |
| Stammbuilt Construction | Lee Michael Stamm | — | (530) 355 0800 | GC, remodel, ADU | Redding · Shasta County | — | — |
| Standardized Plumbing | Ross William Caples | — | (530) 510 2978 | GC, remodel, ADU | Palo Cedro · Shasta County | — | — |
| Stankey And Sons Fire Protection | Gary Scott Stankey | — | (530) 221 4241 | Other | Palo Cedro · Shasta County | — | — |