O’Connor Castle Building Supply is a premier building materials supplier based in Orillia, ON, proudly serving contractors and builders across Ontario. As a trusted partner of Castle Building Centers, we source high-quality materials directly from Castle’s extensive network, allowing us to deliver a comprehensive selection of building supplies to meet the needs of any project. From complete lumber packages and custom trusses to top-grade siding, roofing materials, windows, doors, and ICF foundations, we’re equipped to support residential and commercial projects of all scales. With flexible custom ordering and reliable, province-wide shipping, we make it easy for builders to access the materials they need, exactly when they need them. At O’Connor Castle Building Supply, we are committed to quality, efficiency, and supporting Ontario’s building professionals every step of the way.