Custom Window Specialists in the Ottawa Region

What determines a window’s quality and effectiveness? A combination of high-quality materials and a superior assembly process make Dalmen Windows and Doors products a leading brand designers and architects trust for their projects. Our custom window products go above and beyond to deliver exceptional value and performance you can trust. Our focus is never on hitting a line quota, but on providing high-quality products that highlight our craftsmanship and allow our customers to bring their projects to life.

We proudly design and build all our products on-site in our manufacturing facility just outside of Ottawa, Ontario. This gives us total control over the quality of the finished product and allows us to create beautiful custom windows for any project you may have in mind. A stunningly designed window is nothing without correct measurements and specialized installation.

Windows Made with Quality Glass

We are dedicated to pushing the envelope in terms of what’s possible with custom window products. All the glass used in Dalmen products has been carefully engineered and installed to ensure optimal performance and comfort. All products sold by Dalmen exceed Energy Star® standards and are professionally installed by trained and certified experts.

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Our Windows

Learn more about the full range of window options offered by Dalmen, Ontario’s leading window manufacturers.


Contemporary styles pair with clean lines and larger frames for unique, eye-catching designs and unmatched durability. As with all Dalmen windows, the Unica series offers exceptional performance and strength with North American-style frames.

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Slim Line Windows

Sleek, low profiles, with thin frames, reducing the space between glass panes. Gamma Slimline windows offer unparalleled energy efficiency and a modern European look and style that can be customized to your needs.

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Aluminum Windows

METRA offers versatile open-in functionality for wide openings with the low-profile frames and durability you’ve come to expect from Dalmen. As the latest windows on the market, they’re perfect for creating stunning views in any building without sacrificing functionality and performance.

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Custom Windows

No matter your needs, our engineering and manufacturing team can create stunning windows to suit any building, design, or style perfectly.