Custom Steel Doors & Windows in Denver, CO

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Mile High Design

If you’re looking for custom steel doors in Denver, Portella offers a unique product line that brings together dynamic design and aesthetic. With our patented thermally broken profiles, we can offer a limitless range of designs suited to your project needs, and our narrow sightlines offer the best view of that Denver skyline or mountain range.

For your next snowbound project or build, work with Portella to find a custom fit for anything from residential to commercial steel doors and windows.

Four Distinct Product Lines

Beyond the remarkable quality of each product, we offer a wide range of design and style options which allows us to truly customize every product for the task at hand. With four product lines spanning Artisan Thermally Broken, Classic, and Storefront Interiors or Exteriors, we can craft a set of tailored steel doors and windows without sacrificing strength, visual appeal, or architectural integrity. View our gallery of projects in Denver and other locations to get an idea of the impact our custom steel installations can bring to whatever you’re planning next.

Portella Announces The Contemporary 3-D Metal Door

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Quality, Tested and Certified

When we talk about performance for Portella’s metal doors and windows, it means verifiable dedication to a rigorous product development and testing cycle that guarantees every product we produce meets and exceeds standards. In addition to third party testing, our steel doors are certified with ASTM, NFRC, and AMAA, with Florida Building Code certification on the horizon.

With our commitment to improving our product lines and surpassing standards with every new round of production, we hope to provide a cross of functionality and stunning design perfect for your next set of custom windows or steel doors in Denver.

Warm in the Winter

Denver can present a unique challenge for windows or doors with metal frames when it comes to thermal conditions and the general climate of Colorado. Fortunately, our Artisan Series is crafted with a variety of thermal and energy efficiency challenges in mind. This allows us to offer Denver designs and materials that were previously unavailable due to difficulties with climate and weather, like steel and glass sliding doors.

With traditional metal frame windows and doors it’s easy for temperature fluctuations to affect heat gain or loss from the metal frames. With the Artisan series, we’ve introduced a GRP (glass reinforced polyacrylamide) which is a non-conducting material that reinforces strength and thermal performance, keeping the cold air in or out depending on the season.

Why Portella?

Portella’s interest in continued excellence encompasses more than just our high quality product lines. From beginning to end, our aim is to build architecturally proven products and strong relationships with builders, architects, and businesses interested in the absolute best commercial steel windows and doors. Here are a few points that highlight all we have to offer:


  • Patented, narrow profile sightlines to see more of the Denver mountain ranges
  • Factory installed glass featuring Low-E options to regulate energy efficiency
  • Metal stops or traditional wet glaze, with interior or exterior glazing options
  • NFRC rated thermally broken simulated divided lite or true divided lite options
  • Clear, concise, one-point communication with one of Portella’s knowledgeable Project Managers from the very first quote to drafting.

Contact a Project Manager to talk about your next project.

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