Are steel windows and doors energy efficient?

<div class="fusion-layout-column fusion_builder_column fusion-builder-column-40 fusion_builder_column_1_1 1_1 fusion-flex-column" style="--awb-bg-size:cover;--awb-width-large:100%;--awb-flex-grow:0;--awb-flex-shrink:0;--awb-margin-top-large:0px;--awb-spacing-right-large:0px;--awb-margin-bottom-large:0px;--awb-spacing-left-large:0px;--awb-width-medium:100%;--awb-order-medium:0;--awb-flex-grow-medium:0;--awb-flex-shrink-medium:0;--awb-spacing-right-medium:0px;--awb-spacing-left-medium:0px;--awb-width-small:100%;--awb-order-small:0;--awb-flex-grow-small:0;--awb-flex-shrink-small:0;--awb-spacing-right-small:0px;--awb-spacing-left-small:0px;"> Yes, steel windows and doors can be highly energy efficient. The Metro M40 System is designed specifically for Australian conditions and can accommodate single and double glazing, with or without low-e coatings. All our windows and doors feature premium weather seals to enhance performance and comfort. For projects that demand advanced insulation, we recommend the Secco OS2 system. The OS2 75 profile incorporates state-of-the-art thermal break technology with high-density polyurethane insulation, while still allowing for double, or triple glazing.

Are steel windows and doors rust or corrode resistant?

<div class="fusion-layout-column fusion_builder_column fusion-builder-column-41 fusion_builder_column_1_1 1_1 fusion-flex-column" style="--awb-bg-size:cover;--awb-width-large:100%;--awb-flex-grow:0;--awb-flex-shrink:0;--awb-margin-top-large:0px;--awb-spacing-right-large:0px;--awb-margin-bottom-large:0px;--awb-spacing-left-large:0px;--awb-width-medium:100%;--awb-order-medium:0;--awb-flex-grow-medium:0;--awb-flex-shrink-medium:0;--awb-spacing-right-medium:0px;--awb-spacing-left-medium:0px;--awb-width-small:100%;--awb-order-small:0;--awb-flex-grow-small:0;--awb-flex-shrink-small:0;--awb-spacing-right-small:0px;--awb-spacing-left-small:0px;"> Yes — the Metro M40 System and range of profiles are rust and corrode resistant. Engineered for durability and long-lasting performance, the M40 System is cold-rolled from a galvanized material, eliminating the need for a hot-dipped galvanization process which is often seen with the traditional W20 and W40 profiles made from a mild steel.

Are steel windows and doors heavy?

<div class="fusion-layout-column fusion_builder_column fusion-builder-column-42 fusion_builder_column_1_1 1_1 fusion-flex-column" style="--awb-bg-size:cover;--awb-width-large:100%;--awb-flex-grow:0;--awb-flex-shrink:0;--awb-margin-top-large:0px;--awb-spacing-right-large:0px;--awb-margin-bottom-large:0px;--awb-spacing-left-large:0px;--awb-width-medium:100%;--awb-order-medium:0;--awb-flex-grow-medium:0;--awb-flex-shrink-medium:0;--awb-spacing-right-medium:0px;--awb-spacing-left-medium:0px;--awb-width-small:100%;--awb-order-small:0;--awb-flex-grow-small:0;--awb-flex-shrink-small:0;--awb-spacing-right-small:0px;--awb-spacing-left-small:0px;"> Steel windows and doors made from mild steel are often heavy and require additional structural support. In contrast, products made from our M40 profile are up to 35% lighter, while also being straighter and stronger than traditional steel profiles. This means you get the timeless strength of steel in a design that’s elegant, functional, and built to last, without the unnecessary weight.

Can steel windows and doors be customized to fit unique sizes and designs?

<div class="fusion-layout-column fusion_builder_column fusion-builder-column-44 fusion_builder_column_1_1 1_1 fusion-flex-column" style="--awb-bg-size:cover;--awb-width-large:100%;--awb-flex-grow:0;--awb-flex-shrink:0;--awb-margin-top-large:0px;--awb-spacing-right-large:0px;--awb-margin-bottom-large:0px;--awb-spacing-left-large:0px;--awb-width-medium:100%;--awb-order-medium:0;--awb-flex-grow-medium:0;--awb-flex-shrink-medium:0;--awb-spacing-right-medium:0px;--awb-spacing-left-medium:0px;--awb-width-small:100%;--awb-order-small:0;--awb-flex-grow-small:0;--awb-flex-shrink-small:0;--awb-spacing-right-small:0px;--awb-spacing-left-small:0px;"> Absolutely. Every steel window and door we manufacture is custom-made to suit your project, tailored in both dimensions and design. Whether you’re aiming for a sleek modern look or a classic style, our Metro M40 System brings your vision to life.

Bi-fold steel doors.

Bi-fold steel doors are engineered to create expansive, uninterrupted openings while maintaining slim steel sightlines and structural strength. Designed to enhance spatial flow, they provide a refined solution for connecting interior areas or seamlessly transitioning between indoor and outdoor living.

Available in multi-leaf configurations, bi-fold steel doors maximise natural light while offering flexibility in how spaces are opened, divided, or enclosed. Whether specified for residential living areas, hospitality environments, or commercial interiors, they deliver a considered balance of durability, performance, and architectural clarity.

Explore our Projects Below to see how bi-fold steel doors are integrated across residential and commercial environments.

Why Choose Bi-fold Steel Doors?

Bi-fold steel doors are commonly specified when:

Wide, uninterrupted openings are required
Indoor and outdoor areas need seamless integration
Flexible space division is desired
Slim sightlines across multiple panels are a priority

Compared to sliding or hinged systems, bi-fold doors allow full-width openings while retaining the strength and longevity of steel construction.

If you are exploring alternative configurations, you may also wish to review Sliding Steel Doors, Pivot Steel Doors, or Double Steel Doors.

External Applications & Performance

Bi-fold steel doors can be specified for both internal and external use. When installed externally, glazing selection, panel configuration, sealing systems, and threshold detailing are tailored to suit the project environment.

Performance outcomes depend on:

Panel configuration
Glazing specification
Installation detailing
Site exposure

Each system is custom-manufactured to align with structural and environmental requirements.

Energy Efficiency & Acoustic Performance

When paired with insulated double glazing or Low-E glass, bi-fold steel doors can achieve strong thermal and acoustic performance suitable for residential and commercial settings.

Performance levels vary depending on glazing configuration, panel quantity, and installation conditions.

Coastal Durability & Finishes

With appropriate surface treatments and protective finishes, bi-fold steel doors perform reliably in coastal and high-humidity environments. Powder coating and specialised finishing systems support long-term corrosion resistance and durability.

Profile options

Metro M40
Secco OS2

Applications

Internal
External

Door hardware options

Magnetic catch
Roller catch
Passage Mortice (Pittella 872)
Deadlock Mortice (Pittella 852) – Key/Snib
Deadlock Mortice, Roller Latch (Pittella 852R) – Key/Snib
Commercial Mortice (Lockwood 3572) – Key/Snib

Additional options

Electric Strike (Lockwood ES2100)
Electric Drop Bolt (Lockwood VLock ES8100)
Door Closer (Lockwood 724SR)

System hardware options

Centor E3 Bifold System
Brio Bifold System (100 weatherfold)

Glass options

Clear Glass
Reeded and Patterned Glass
Single Glazing
Insulated Double Glazing
Noise and Sound Attenuation
Low-E Coatings

Glass specs

Single Glazing
U-Value 5.7
SHGC 0.79

Double Glazing
U-Value 2.5
SHGC 0.67

Double Glazing Low-E
U-Value 1.4
SHGC 0.55

Finishes

Painted
Brass
Stainless Steel
Powder Coated
Raw Galvanised Steel

FAQ

View projects with our bi-fold steel doors.

The Royce HotelRichard Ludbrook2026-01-29T15:17:14+11:00

The Royce Hotel

Colonnade HouseRichard Ludbrook2026-02-11T15:03:59+11:00

Colonnade House

Steel windows and doors manufactured with the Metro M40 System offer unmatched strength while providing slim sight-lines and a modern aesthetic.

They are more durable than alternatives such as wood or uPVC, and unlike aluminium or some other steel profiles, the M40 profile supports large panes of glass without requiring additional mullions, transoms, or bulky reinforced frames.

The Metro M40 System is a complete window and door solution designed specifically for the Australian market. Suitable for both internal and external applications, it combines the classic W20 and W40 steel profiles with the innovation of the Italian Secco systems to deliver a durable, contemporary, and cutting-edge steel window and door solution.

Yes, steel windows and doors can be highly energy efficient.

The Metro M40 System is designed specifically for Australian conditions and can accommodate single and double glazing, with or without low-e coatings. All our windows and doors feature premium weather seals to enhance performance and comfort.

For projects that demand advanced insulation, we recommend the Secco OS2 system. The OS2 75 profile incorporates state-of-the-art thermal break technology with high-density polyurethane insulation, while still allowing for double, or triple glazing.

Yes — the Metro M40 System and range of profiles are rust and corrode resistant. Engineered for durability and long-lasting performance, the M40 System is cold-rolled from a galvanized material, eliminating the need for a hot-dipped galvanization process which is often seen with the traditional W20 and W40 profiles made from a mild steel.

Steel windows and doors made from mild steel are often heavy and require additional structural support. In contrast, products made from our M40 profile are up to 35% lighter, while also being straighter and stronger than traditional steel profiles.

This means you get the timeless strength of steel in a design that’s elegant, functional, and built to last, without the unnecessary weight.

Steel is approximately three times stronger than aluminium and far more durable than wood or timber, which can rot or require ongoing maintenance.

The Metro M40 profile is 35% lighter than traditional steel profiles, yet stronger, allowing for larger spans of glass without compromising on structual integrity. Made from galvanized steel, the M40 System avoids common issues like warping or mill scale that can occur with heat-treated mild steel used in traditional steel windows and doors. Its smooth, flat surface requires no bog filling or sandblasting, providing a superior finish straight from the factory.

Additionally, steel is naturally non-combustible and fire-resistant, ensuring that windows and doors made with the M40 profile offer long-lasting strength, safety, and performance.

Absolutely. Every steel window and door we manufacture is custom-made to suit your project, tailored in both dimensions and design. Whether you’re aiming for a sleek modern look or a classic style, our Metro M40 System brings your vision to life.