Steel Windows and Doors

Our custom steel windows and doors are available in two unique product types – Grabill Steel and Classic Steel.

Grabill Steel was custom designed by Greg Grabill to meet the architectural demands for monumental openings and curtain walls. The steel interior tubular system offers a choice of either an aluminum or bronze clad exterior. This product is thermally broken and is engineered to accommodate narrow frame details with large expanse glass. Artfully exposed weld beads complimented by hand rubbed patina finishes, make this exclusive product line a sought after architectural element. This product can easily integrate with Grabill’s wood clad windows and doors, as they share the same exterior profiles.

Grabill Steel Window and Door highlights

  • Fully welded frames, factory glazed or supplied glass
  • Custom engineered, fully welded frames are perfect for supporting large expanse glass
  • Thermally broken using cutting-edge proprietary design component
  • High performance, energy efficient glazing options
  • Premium hardware features stainless steel and architectural bronze levers and trims with specified finish options
  • Integrated curtain walls and store front systems with unlimited configurations



Classic Steel is an all steel thermally broken system, which combines the essence of original steel window designs of the last century, with state-of-the-art manufacturing technology. This modern product features cold rolled, tightly formed profiles that provide narrow site lines and increased views. Classic Steel follows the design principles of hot rolled steel profiles and is able to match authentic renovations of historic buildings, as well as modern high end residential or boutique commercial facades.

Classic Steel Window and Door highlights

  • EDPM double gasketing
  • High-density polyurenthane thermal break
  • Fully welded frames, factory glazed or supplied glass
  • High performance custom finishes
  • Galvanized steel and aluminum glazing beads with a variety of options
  • Traditional window hardware and through screen operation with nearly invisible screen cloth

Custom steel products are maintenance free, fire resistant and environmentally friendly.

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