National Lumber is a locally-owned construction material, window and door, kitchen and bath materials showroom and store. We ... carry top of the line products and employ the area's top experts who are ready to help you transform your home. We are proud to have called Baltimore 'home' for nearly a century. Visit our showroom to tour the possibilities for your home with best-of-breed brands like Marvin Windows, Jeld-Wen, StarMark and more. read more