The power of steel windows becomes obvious the moment you look at a home like this.
Why Steel Elevates Modern Living
Slim Sight Lines That Maximize Views
Steel holds more weight with less material, which creates those thin frames people love.
That strength gives your space more glass and less bulk.
It’s the easiest way to make a room feel brighter and more open without changing your floor plan.
Strength That Supports Oversized Glass
Oversized openings don’t intimidate steel.
The structure stays solid even when the window spans entire walls.
That reliability is why architects keep choosing steel for large, uninterrupted views.
The Balance of Form and Function
A window shouldn’t just look good.
It should work hard in the background.
That’s why we blend clean geometry with durable materials so each unit stays beautiful year after year.
Floor-to-Ceiling Designs That Transform a Home
Large Glass Walls for Natural Light
Floor-to-ceiling steel windows turn natural light into a design feature instead of an afterthought.
Light spreads across the entire interior, just like what you see in the attached photo.
Creating Indoor-Outdoor Flow With Steel Doors
Steel doors frame outdoor areas like artwork.
When opened, the space feels connected and seamless.
When closed, the view stays expansive.
The Impact of Clean, Minimal Framing
Minimal lines let your architecture shine instead of blocking your view.
The structure feels intentional, modern, and calm.
Custom Options for Any Architectural Style
Fixed, Casement, Awning, and French Doors
Each opening in your project can be matched with the right operating style.
Steel makes it possible to mix fixed units with casements, awnings, or French doors without breaking rhythm.
Thermally Broken vs. Non-Thermal Systems
Cold climates benefit from thermally broken frames.
Warm climates may choose non-thermal options for heritage or industrial looks.
We offer both so the right choice fits your exact needs.
True Divided Lites and SDL Options
TDL and SDL patterns shift the personality of a window instantly.
Choose bold grids, thin grids, or keep the glass clean.
Each one changes the atmosphere of a room.
How Optimum Steel Windows Deliver Long-Term Performance
Fully Welded Cold-Rolled Frames
Cold-rolled steel gives you a stronger connection at each joint.
Our units use welded construction that stays tight over time.
According to our specs, frames are mitered, welded, and built for structural endurance.
High Insulation With Thermal Break Technology
Thermally broken systems deliver better comfort in all seasons.
The RTS430 and 6500 series both use insulated profiles that block heat transfer.
This design keeps temperatures steady throughout the room.
NFRC Ratings and Air/Water Performance
Our systems meet NFRC certification for energy performance.
Air and water infiltration levels stay low even during harsh testing.
The RTS430, for example, delivered strong numbers in structural pressure and water resistance tests.
Oversized Engineering Capabilities
Large openings are part of our core capability.
We reinforce units, adjust hardware, and use engineered profiles to take on bigger spans without losing strength.
This is how we create the dramatic walls of glass you see in the featured home.
Material Options Built for Durability
Galvanized Cold-Rolled Steel
Cold-rolled steel gives you crisp edges and sharp geometry.
It’s coated with galvanized underlayers for corrosion resistance.
You get a long-lasting frame ready for decades of use.
Stainless Steel, Bronze, and Cor-Ten Choices
Some spaces call for something even more special.
Stainless steel adds a refined, modern feel.
Bronze develops a warm patina.
Cor-Ten brings out a rugged, weathered texture.
All of these options appear in our Flex 6500 offerings.
Powder-Coated Finishes With 10-Year Warranty
The finish isn’t just color.
It protects the steel from the elements.
Optimum’s powder coating meets AAMA standards and carries a 10-year warranty.
Energy Efficiency for Year-Round Comfort
Low U-Values for Better Insulation
Thermally broken frames and insulated glass lower energy transfer.
That means your HVAC system works less while each room stays comfortable.
Many of our products deliver U-values competitive with high-performance wood windows.
Dual and Triple Glazing Options
Glass options shift performance dramatically.
Dual glazing handles most climates easily.
Triple glazing boosts insulation for extreme temperature zones.
Condensation Resistance in All Climates
Thermally broken designs minimize interior condensation.
That keeps your frames and sills cleaner and reduces long-term wear.
Fire-Rated Options for Safety and Code Requirements
45–90 Minute Rated Window Systems
Some projects require fire protection between spaces.
We offer windows with ratings from 45 to 90 minutes depending on the glazing.
UL-Certified Designs for Code-Sensitive Projects
Our fire-rated series are UL listed and approved for installation in New York City.
This gives designers confidence in both safety and compliance.
Where Fire-Rated Systems Are Required
Fire-rated windows are often used in corridors, stairwells, property line walls, and mixed-use buildings.
They bring daylight into spaces that would normally stay closed off.
Design Flexibility for Residential and Commercial Spaces
Modern Homes With Large Glass Walls
Minimalist homes benefit from clean lines and generous openings.
Steel brings structure without sacrificing style.
Historic and Landmark Restoration
Steel matches the visual language of historic buildings.
The 6500 series in particular bridges old-world looks with modern performance.
Retail, Hospitality, and Mixed-Use Projects
Businesses rely on visibility.
Steel windows frame storefronts while staying secure and long-lasting.
How Steel Windows Enhance Outdoor Living
Creating Patio and Courtyard Connections
Steel doors turn patios into fully functional extensions of your living room.
The frame acts like a picture border around your outdoor space.
Bringing More Morning and Evening Light Inside
Tall glass openings pull sunlight deeper into the home.
The result feels crisp and refreshing.
Boosting Architectural Value With Vertical Lines
The vertical steel framing emphasizes height.
This makes a house look more luxurious and intentional.
Choosing the Right Product Line for Your Project
Hot-Rolled HR4500 & HR4700 Series
Hot-rolled steel brings you authentic steel texture and extremely narrow profiles.
HR4500 offers slim lines with multi-point locking hardware.
HR4700 handles larger glass with deeper frames.
Thermally Broken RTS430 Series
RTS430 blends beauty with energy performance.
Thin sight lines meet NFRC-certified numbers for insulation, air infiltration, and water resistance.
Installation and Engineering Considerations
When Oversized Glass Requires Reinforcement
Large units may need structural mullions or reinforced profiles.
We design these solutions into the shop drawings.
Proper Flashing and Weather-Sealing
Weather-stripping and sealing are crucial for long-term performance.
We use dual weather-stripping and tested glazing methods.
Why Fully Welded Frames Matter
Welded joints reduce movement.
This keeps lines clean and tight throughout the lifetime of the window.
Why Homeowners and Architects Choose Optimum
Custom Manufacturing for Any Opening
Every unit is made to order.
That means no stock sizes, no compromises.
100% Recycled Steel and Eco-Focused Production
We rely on recycled steel and environmentally responsible coatings.
Sustainability is built into the process.
Decades of Proven Performance
We started in 1985 and continue to produce steel systems used nationwide.
Our products appear in magazines, design showcases, and luxury homes across the country.
Bringing Your Design Vision to Life
Working With Architects and Builders
We collaborate directly with architects and contractors on complex designs.
Your drawings guide each detail.
Visiting the Manhattan Design Studio
The design studio gives you a chance to touch materials, see finishes, and compare configurations.
Turning Inspiration Into a Custom Steel System
Whether you need a single door or an entire home of steel windows, we build the pieces that shape your space.