Diamond Windows is a windows manufacturer based out of Boston, Massachusetts. We specialize in constructing custom windows for residential and commercial clientele with a focus on the historical market. We currently offer vinyl and thermal aluminum window systems. Our windows are handmade in the USA and made according to the specifications set by the client. Regardless of the challenge, Diamond will always be open to tackle it. On large custom projects this has resulted in cutting new aluminum extrusions to design brand new products to meet that specific project requirements. We pride ourselves on manufacturing high quality windows that meet both the historical aesthetic of a building and modern energy standards.