Trillium General Contractor provides high quality interior remodeling, renovations, and repairs. We remodel every room in the house! Need Roofing, Siding, Gutter, Window, Door and other Home Exterior Remodeling Services in Marin County? Trillium General Contractor is Marin's premier home exteriors contractor. No matter what you would like done to the exterior of your home, Trillium General Contractor is the right company for you. We specialize in roofing, gutters, fences, decks, windows, siding, doors.