steel windows by portamet

Portamet – Global Steel Windows Manufacturer (Secco Sistemi, Ottostumm, Jansen & More)

Quality & Style

Portamet is a leading steel windows manufacturer based in Europe (Poland), delivering premium thermally broken steel windows to architects, developers, contractors, and homeowners across Central/Eastern Europe and the USA. We build all our steel windows and doors locally and ship them worldwideportamet.com. Our products include advanced systems like Secco Sistemi OS2 75, Jansen Janisol, Ottostumm FerroFinestra, Forster Unico XS, and RP Technik systems, ensuring each installation combines timeless style with top-tier performance. With locally sourced, high-quality materials and multi-lingual (EN/PL/DE/FR) support, Portamet offers durable, energy-efficient steel windows that meet international standards. Contact us to request a quote or brochure and see how Portamet can enhance your next project.

The original steel window manufacturer

We build your steel windows and doors in Poland and ship them all across UE and USA. We only highest quality materials. Our construction materials are sourced locally, for a greener future.

We are a leading manufacturer of steel windows, thermal windows and other products that can be customized according to your requirements. 

Let us produce for You!

Steel Bifolding doors Secco Sistemi

steel windows manufacturer

Key Benefits & Features of Portamet Steel Windows

  • Enduring Durability: Our steel windows are crafted from premium-grade steel, ensuring they “withstand the rigors of time and nature”portamet.com. Systems like Jansen’s Janisol series deliver exceptional strength and security, making them ideal for both modern and historic buildings.

  • Energy Efficiency: We specialize in thermally broken steel windows that significantly reduce heat transfer. For example, our Secco Sistemi OS2 75 and Ottostumm FerroFinestra profiles feature high-density polyurethane insulation, helping to regulate indoor temperatures and meet global energy standardsportamet.comportamet.com.

  • Minimalist Design: Many Portamet systems boast extremely slender frames for maximum glass area. RP Technik’s Fineline and TecLine systems allow slim steel window frames as narrow as 45 mm Rp Technik, creating a sleek, linear aesthetic. Similarly, Forster’s Unico XS offers a 100% steel profile (no plastic) with very narrow face widths, enabling large-format glazing that floods interiors with natural lightportamet.comportamet.com.

  • Customization & Versatility: Each steel window can be tailored to your needs. Portamet supports a full range of opening types (side-hung, tilt-turn, pivot, sliding, folding, etc.), colors, and glass options. The Secco OS2 75 system alone provides tilt-turn, lift-slide, bi-folding, pivot, and even anti-burglary variantsportamet.com. Our flexible production means we can adapt profiles (round, arched, or custom geometries) for new constructions or renovations.

  • Made in Europe & Sustainable: Manufactured in our Gdańsk workshop, our windows meet strict European quality standards. We source steel and components locally to reduce carbon footprint, supporting a greener futureportamet.com. The inherent durability of steel also means our products have a long lifespan and can be recycled, aligning with sustainable building goals.

  • Fast Lead Times & Service: Unlike some bespoke manufacturers, Portamet offers short lead timesportamet.com. Our streamlined process (from inquiry to delivery) and worldwide shippingportamet.com ensure projects stay on schedule. We provide dedicated support in English (and Polish/German), guiding you through design, ordering, and installation.

steel doors and windows. metal frame doors nyc and canada

Systems We Work With

Top-Tier Steel Window Systems We Manufacture With As a versatile steel windows producer, PORTAMET fabricates units using all major European steel systems: 

Secco Sistemi  – minimal, thermally broken, architectural-grade 

Jansen Steel Windows – sleek Swiss precision for residential and commercial builds 

Ottostumm FerroFinestra – heritage steel profiles with modern thermal performance 

Forster Unico / Unico XS/ Economy – ultra-narrow thermally broken profiles 

RP Technik – German-engineered steel solutions for modern facades

Ferrofiniesta w 50 TB Ottostum Portamet

Ottostumm Steel Profiles with Thermal Brake

Ottostumm’s FerroFinestra series (e.g. W50 TB, W75 TB) combines Italian elegance with thermal technology. The W50 TB profile uses 1.5 mm galvanized steel and a cast-in polyurethane thermal break. The result is a durable, corrosion-resistant frame that can house insulating glass up to 38 mm thick. 

Ottostumm profiles are praised for blending “precision engineering and design aesthetics”portamet.com. In practice, these windows offer robust construction (resisting wind and weather) and enhance energy efficiency by minimizing heat transfer. Available in many finishes, Ottostumm FenRoFinestra windows add a modern yet timeless touch to any architecture.

Janisol arte Jansen steel windows

Jansen systems for steel Windows and Doors

Jansen’s Janisol and Janisol Arte steel profiles are known for unrivaled strength and customization. Crafted from premium steel, Jansen windows “withstand the rigors of time and nature”. The Janisol Arte series offers particularly narrow frames and concealed fittings for a sleek, uninterrupted look – perfect for historic restorations or contemporary homes. These systems support side-hung, tilt-turn, and bottom-hung windows (and even RC2 burglary resistance), combining slim design with high performance.

Thanks to profiles such as Janisol Arte they are also perfect for small projects and therefore chosen by homeowners all around Europe and the US. 

  • Janisol Arte
  • Janisol 1
  • Janisol Arte 66

Choose which steel profile is best for your steel windows and doors.

forster unico xs PORTAMET STEEL doors

Forster Profiles for Steel Doors And Windows

Forster Unico XS is a 100% steel window system (no plastic thermal breaks) that excels in listed or high-end buildings portamet.com . Its freely bendable profiles allow custom shapes and large sash sizes (up to 1440×2440 mm for turn windows). 

These slender steel profiles flood spaces with light and creative possibilities. Outward-opening variants feature smart scissor hinges; inward versions are flush and can even meet RC2 security. Thanks to the fully steel design, Unico XS delivers both a filigree appearance and excellent insulation – offering maximum design freedom and energy efficiency portamet.com portamet.com

steel pprofile by secco sistemi

Secco Sistemi systems for steel Windows and Doors

Secco Sistemi OS2 75 Steel Windows – Refined, Minimal, Thermally Broken
We specialize in manufacturing high-end steel windows using the Secco Sistemi OS2 75 system — the benchmark for slim, thermally broken profiles. This system is ideal for both heritage restoration and modern architecture, delivering exceptional performance and visual elegance.

Key Benefits:

  • Ultra-slim 27–47 mm visible section

  • Thermal break for superior energy performance

  • Compatible with double/triple glazing

  • Available in galvanized steel, stainless steel, Cor-Ten, and brass finishes

  • Perfect for historic renovations and LEED-compliant buildings

 

bifold doors portamet steel

Bifolding steel windows

Our External BiFolding Doors are the obvious choice for a distinctive touch of elegance that you won't find anywhere else. 

W40 steel exterior bi-fold doors, this masterpiece in the industrial style is genuinely unique. With a robust multi-panel structure that can convert large wall sections and an inventive thermally broken design, our magnum opus performs better than its breathtaking beauty.

We specialize in BIFOLDING STEEL DOORS in:

  • W40
  • W50 TB
  • W75 TB

     

External steel windows and doors by Portamet

Steel windows and doors are durable, beautiful, and strong. Steel windows are the most common choice for new construction or remodeling. They can be customized to fit your needs, and made in different styles and colors which means you get lots of options.

Steel windows and doors

Steel windows and doors are strong, durable, energy-efficient, and beautiful. They're also easy to clean. Steel windows have a lifespan that's similar to wood—about 100 years before they begin to show signs of wear. Steel doors last even longer than window frames—around 50 years or more! This means you can get quality products for your home that will be around long after you're gone (and so will we).

Choices of steel windows and doors

Choosing steel windows and doors is a big decision that should be made carefully. There are a variety of styles, colors, and sizes to choose from. Steel windows and doors have been used for many years because they offer great durability and strength while being very affordable. Steel is a good material for these types of products because it’s strong enough to withstand high temperatures without cracking or breaking down over time like other materials do when exposed to extreme heat conditions (like an oven).

Advantages of steel doors and windows

Steel doors and windows are durable, strong and beautiful. They can be painted to match your home's interior or left in their natural color. Steel is also energy efficient, offering you both a long life as well as high performance at a competitive price. Many types of steel are fire-resistant as well! Steel has many advantages over other materials when it comes to making doors and windows:

Steel windows are beautiful, durable, and strong.

Steel is a great choice for exterior doors and windows, as well as interior doors and windows. Steel is an excellent material for patio doors, sliding glass doors, storm door upgrades, and more. Steel also offers the added benefit of being an energy efficient building material that can help you save money on your utility bills while providing quality insulation. When you need a new door, window, or patio screen door, give us a call. We can help you find the perfect one for your home. We are an authorized dealer for all of the top-name brands. This means you can rest assured that we only sell quality products that will stand up to the test of time.

Steel windows are beautiful, durable, strong.

Steel is a great choice for exterior doors and windows, as well as interior doors and windows. Steel is an excellent material for patio doors, sliding glass doors, storm door upgrades, and more. Steel also offers the added benefit of being an energy-efficient building material that can help you save money on your utility bills while providing quality insulation. When you need a new door, window, or patio screen door, give us a call. We can help you find the perfect one for your home. Conclusion Steel windows and doors are an excellent choice for the home. They can be custom-made to fit your needs and look great in your home. Steel windows are durable, strong and beautiful!

 

Steel windows by portamet

Technical & Finish Options

Design the Perfect Steel Window System

Thermal Break Options – Double and triple glazed 

Opening Types – Fixed, tilt-turn, casement, awning, pivot , bi-folding, sliding

Finishes – Galvanized steel, stainless steel, Cor-Ten, painted RAL finishes 

Glazing – Clear, reeded, frosted, safety, laminated, or heritage restoration glass , glass of your choice

Hardware – Minimalist, vintage, or custom hardware options

 

 

 

steel windows by secco sistemi

Get a Quote or Specification

Let's Build Your Vision in Steel
Ready to elevate your project with architectural-grade thermally broken steel windows?

📞 Call our sales team
📩 Send your project drawings
📄 Request system compatibility and performance reports

 

steel windows by portamet

Energy Efficient & Durable

Steel windows are a great option for homeowners seeking for windows that are both functional and aesthetically beautiful because they are strong, energy-efficient, and durable.     

 

 

 

 

 

 

Portamet export of crittall doors

Global Supply & Installation Support

Steel Windows – Shipped Worldwide, Installed Locally
Whether you're in Warsaw, Vienna, Berlin, New York, or Los Angeles, PORTAMET delivers precision-engineered steel windows globally. We collaborate with local installers and architects to ensure seamless integration and compliance with local codes.

🌍 Serving Central Europe, Eastern Europe, and the USA
📦 Packaged for export with all necessary hardware, documentation, and support
🛠️ Installation support available via our international partner network

STEEL WINDOWS - FREQUENTLY ASKED QUESTIONS

PORTAMET – Custom Steel Window Manufacturer for Europe and the USA PORTAMET is a European steel window manufacturer with global reach. We produce custom thermally broken steel windows using Secco Sistemi OS2 75, Jansen, Ottostumm, Forster, and RP Technik

1. How big can steel doors and windows be?

Steel windows and doors are commonly chosen for their capacity to fill very big openings while preserving narrow sightlines because they are custom made on a project-specific basis. Steel windows and doors can be built as big as or bigger than any other traditional window and door system because of the material's inherent strength.

2. Do you make steel windows using recycled materials?

Steel window pieces made entirely of recycled steel are used to construct hot-rolled steel windows.

3. What are steel windows and doors' U-values?

The type, thickness, and type of framing material all affect the U-values. The U-value for steel windows is determined for the complete window, taking into account the glass and frame materials as well as the fixed or operable window design. Both physical testing and computer simulation of the U-value are options. Industry-acceptable U-values will be produced by the minimal steel framing profiles, the low coefficient of heat transfer, and bigger glass areas. For more detailed information, speak with specific members.

4. What exactly is E-coat?

E-coat is an immersion painting technique in which charged paint particles are drawn to a metallic surface that is negatively charged. A metal component that is submerged in a bath of paint particles that have opposing charges is given a DC charge by the E-coat system. The paint is attracted to the metal portion, where it is then deposited on the surface in an even, continuous film until the coating is the appropriate thickness. The film insulates the area where attraction ceases and the operation is finished at that thickness.

5. Do aluminum glazing beads really react negatively with steel?

No. Any corrosive interaction between different metals is prevented by paint coatings.

6. What goes into glazing steel doors and windows?

Glassing materials generally used to glaze steel windows and doors include glazing tape, glazing wedges, setting blocks, specially made, pre-fitted glazing beads, and a cap bead of sealant.

7. What kinds of glass are suitable for use in steel windows?

Steel windows can accommodate most high-performance insulated glass products now on the market, as well as glass thicknesses ranging from 1/8" to 1-1/4", including single pane, laminated or leaded glass.

8. What are egress windows, exactly?

Egress windows offer an aperture large enough for inhabitants to leave in the case of a fire or for a fully-equipped fireman to enter from the outside. The minimum clear opening width for an egress window is 24 inches, the minimum clear opening height is 20 inches, and the net clear opening requirement is 5.7 square feet, according to the International Codes. An egress window's sill height must not exceed 44 inches in order for it to be in compliance with the codes.

9. Can steel be used for egress windows?

Absolutely! For information on available designs, please contact our member companies.

10. What kinds of screens can be used with steel windows?

There are available insect or security screens. signs.

11. Can steel windows meet window fall prevention requirements?

Yes. The windows can easily be limited to the required clear opening restriction, yet can be released for cleaning.

12 What's the main distinction between hot- and cold-rolled steel?

Solid steel sections that have been hot-rolled from brand-new billet steel into shapes intended for window and door frames and ventilators are used to make hot-rolled steel windows and doors. Hollow steel sections that have been mechanically cold-shaped from flat sheets of 20 gauge or thicker cold-rolled steel into profiles specifically built for window and door frames and ventilators are used to construct cold-rolled steel windows and doors.

13. What varieties of steel pretreatment and finish paint are available?

Finish paints include enamels, polyurethane, and powder, while pre-treatment options include e-coat or galvanizing. For more detailed information, speak with specific members.

14. How long ought a paint finish to endure? A: Depending on the location, a paint finish can last 14-20 years with minimum maintenance. For advice on specific members' care, consult them.

15. Is it hard to replace shattered glass in a steel window?

Continuous snap-in glazing beads that can be readily removed to repair shattered glass and reinstalled with fresh glazing materials are typically offered with steel windows.

16. Are steel doors and windows energy-efficient?

Steel windows and doors are effective in retaining heat. For instance, steel has a 5 times higher thermal resistance than aluminum. Steel's strength allows for tight sightlines, which lowers the proportion of framing to glass. The U-value of a window or door improves with the amount of glass present.

17. Are thermally broken steel windows and doors available?

A thermal break is an option for steel windows and doors. Check with specific members for details.

18.How does the lifespan of steel windows (or doors) compare to those made of aluminum, wood, or vinyl?

Steel windows and doors exceed any other window material, including aluminum, wood, and vinyl, due to their inherent strength and durability.