Our Story

aboutDiamond Windows & Doors was founded in 1992 by Tony Tseng. Tony followed in his father’s footsteps into the building and construction trade as a contractor. He eventually decided to go into business for himself using his understanding of the product quality required to meet and exceed the expectations of the architect, contractor, and end-user. With this knowledge and the contacts that he had made over the years, Tony soon had a successful thriving window manufacturing business operating out of the Brighton/Allston neighborhood.

Following the exacting standards required in the construction industry, Tony has stayed true to his roots. Knowing that the quality of a house is only as good as what you put in it, Diamond Windows has always sought to maintain a high standard. With this in mind, our vinyl windows have already evolved into a third generation of better performing windows as we are continually looking for ways to improve our product.

As our customers’ needs have grown, so have we. Diamond Windows has enjoyed steady growth over the years and is continuously looking for new ways to expand and improve our product lines, as well as our manufacturing systems. Since moving into our new state-of-the-art facility in Boston, we’ve expanded beyond residential windows to include a line of Commercial and Heavy Commercial (HC) rated aluminum windows as well as historic steel replica windows for projects that must meet historical building codes.