Mt. Si Contracting LLC is a fence and deck company with a personal touch. We are your local option for decks, fences, gates, and pergolas. We cut custom wood to meet your needs, as well as treat and stain your fences and decks to make them water-resistant and the color you need. When dealing with Mt. Si Contracting, you always deal directly with the owner. Nate will be on every job pe... Mt. Si Contracting LLC