100% Fabricated and Assembled In the USA


optimum window mfg corp

For over 33 years, we have taken great pride in fabricating in the state of New York.

Each of our custom steel window and doors are all proudly designed and manufactured in the United States with recycled materials and in a facility that aims to become a “greener” institution each year!  We are happy to say that we ship our steel products nationwide, as well!

DESIGN studio & private showroom

Built-In Ellenville

Our innovative team at our upstate facility ambitiously works every day to custom craft each steel window and door ordered by our customers, regardless of scope or scale.  Using state-of-the-art technology to create inspiring applications out of the versatile material that is steel. 

Design in Manhattan

Looking for further inspiration?  Our Design Studio located in Manhattan provides a plethora of our steel windows and doors in a variety of intuitive systems.  Our insightful sales team can help guide you through your design process.