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| Company | Location | County | Certifications | License # |
|---|---|---|---|---|
| Laframboise, Tim | Watertown, SD | — | Installer | — |
| Landphere, Branden | Bison, SD | — | Installer | — |
| Langle, Lance | Freeman, SD | — | Installer | — |
| Larive, Tyler | Sturgis, SD | — | Installer | — |
| Larson Sr, Troy | Yankton, SD | — | Installer | — |
| Larson, Kolby | Revenna, SD | — | Installer | — |
| Lefdal, Dustin | Ellsworth, SD | — | Installer | — |
| Leloux, Ryan | Hull, SD | — | Installer | — |
| Lewandowski, Kent | Wilmot, SD | — | Installer | — |
| Lindner, Dana | Watertown, SD | — | Installer | — |
| Linn, Shannon J | Letcher, SD | — | Installer | — |
| Livingston, Robert | Hill City, SD | — | Installer | — |
| Loerzel, Greg | Hermosa, SD | — | Installer | — |
| Lovgren, Michael | Ortonville, SD | — | Installer | — |
| Lowry, Heath L | Rapid City, SD | — | Installer | — |
| Ludwick, Roger | Sturgis, SD | — | Installer | — |
| Luke, Casey A | Springfield, SD | — | Installer | — |
| Lundeen, Daniel | Rapid City, SD | — | Installer | — |
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