Marvin windows and doors have the power to transform the spirit of a room. Each product is made-to-order, one at a time, to your exact specifications. With our customization options, exclusive features, high-performance energy-efficient innovations and our unmatched personal service at every point in the process, you will be able to find the perfect windows and doors for your project. JB Sash is the #1 Marvin dealer in New England. Not only are we the largest dealer but we provide unmatched customer service, before, during and after the sale. Our shop services department can also transform your Marvin windows and doors to meet specific architectural details specified in the New England market, setting us apart from our competition.