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Steel Windows & Doors

Built around thermally broken steel frames and multiple air seals, EPOC [Stël] systems deliver the slim sightlines and structural integrity of steel with the thermal performance modern high-performance construction demands. Dual and triple pane glazing options, including a triple-pane configuration with three air seals and an 85mm frame, allow each system to be specified to the exact demands of the project. For architects and builders pursuing the most refined window and door package available, [Stël] is the answer.

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EPOC [Stël+]85 steel window — thermally broken tubular steel frame with triple pane glazing"

Steel System Tiers

[Stël]65

The [Stël]65 features a 65mm thermally broken steel frame with multiple air seals, delivering high-performance glazing in a classic steel profile.

[Stël+]75

The [Stël+]75 is a non-tubular hot and cold rolled steel frame, achieving the absolute minimum visible profile while delivering triple pane R-9 glass performance.

[Stël+]85

The [Stël+]85 features a tubular steel frame for maximum rigidity, with triple pane R-11 glass performance. The top-tier [Stël] specification for projects where thermal performance and refined detailing are both non-negotiable.

Steel Finish Options

Stainless and Galvanized Steel

Available in stainless cold rolled and galvanized hot rolled frame profiles, both highly resistant to corrosion.

Corten Steel

Corten is available with a controlled oxidization process, allowing the desired patina finish and chromatic effect to develop over time.

Brass

Brass can be specified in satin, burnished, and polished finishes for a frame finish unlike anything else in residential construction.

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Colour Options

Steel frames are available in a range of surface finishes that develop character over time, from raw and oxidized to polished and patinated. Hardware in matching or contrasting finishes ties the full unit together. What reads as industrial at first glance is, in practice, simply timeless.

Steel Windows and Doors for Architects and Custom Home Builders

Steel windows and doors have long been the specification of choice for architects pursuing maximum sightline reduction without sacrificing structural performance. EPOC [Stël] systems bring that same design language into the modern high-performance envelope : thermally broken frames, triple air seals, and triple pane glazing that meets the thermal demands of net zero and Passive House adjacent projects.

The [Stël] lineup is equally at home on a contemporary mountain residence, a loft conversion, an urban infill project, or a historic renovation where steel window profiles are architecturally required. Each system is custom fabricated to exact opening dimensions, with no standard sizes and no off-the-shelf compromises. Hardware is specified in matching or contrasting finishes, from satin stainless to burnished brass, giving the architect full control over every visible detail.

EPOC works directly with architects, designers, and custom builders across the United States to specify and install steel window and door packages from concept through closeout. Lead times, shipping, and installation coordination are managed for projects anywhere in the continental US.

[Stël+]85 — Tubular Steel Frame, R-11 Triple Pane burnished