Steel windows and doors

Resistance, durability over time and security are the features that make the steel the most valuable material for top quality window frames. Steel has a considerable mechanical strength, which is why it is ideal for security windows and doors in buildings that require high anti-burglary standards. Moreover the robustness of steel allows to maximize glazed surfaces, in line with contemporary architectural trends, with a reduced footprint of profiles, for design houses or commercial buildings with refined taste.

Steel metal alloys are natural and recyclable, therefore they have a low environmental impact. The cost of a steel window frame is repaid over time in terms of safety, performance and durability.

Design and performance of steel frames


Thanks to steel you can get thin profiles but at the same time resistant and performing. Steel is the material that, more than any other, leaves freedom to creativity architects in the design of the window and door frames, thanks to its versatility and ductility. Every steel window and door is, therefore, an artisan product which fits harmoniously into any typology by building from the most ancient till contemporary architectures. That's why the most renowned architects choose steel in their projects for prestigious buildings with large windows.

The strength of steel determines the possibility of reduced profiles, for an effect of lightness and transparency, which make the environments extensive and bright, dematerializing the walls.

Thermal and Acoustic Insulation

The performance of steel alloys are very high. Steel's thermal conductivity is ten times lower than aluminium and, thanks to the thermal break, the transmittance is considerably reduced, for effective energy savings. Even the acoustics performance are remarkable, up to 43 dB for truly serene and relaxing environments.


The hardness and strength of this material make steel windows and doors among the safest on the market: it is possible to reach the RC4 security level. This level is recommended for buildings such as banks or jewelry stores, or for those who want extreme security for their homes.

Our systems for your steel windows and doors

SECCO Systems Made in Italy

Research and innovation, tradition and experience. These are the cornerstones of the collaboration between Aluser and Secco Sistemi. Secco Sistemi is a leading company in the sector, it has received important recognitions for its constant innovation and technological development in the production of metal profiles for the building industry.

Secco steel windows and doors are distinguished by their valuable materials attention to detail and the unmistakable design. This is why the company has taken its products all over the world and collaborated with the most important masters of contemporary architecture. Secco proposes 16 product lines that can be manufactured in 4 different materials. There are many finishes from which customers can choose, as well as accessories and types of opening.

Choosing a Secco window and door frame means choosing the best on the window and door market, for design projects that are never taken for granted.

Jansen Windows

At Aluser you can find Jansen thermal break steel window frames for windows, doors, facades and other architectural elements. Jansen offers innovative and customized solutions to meet the most demanding customer needs.

Choosing Jansen windows and doors means opting for elegant, minimalist designs that maximize glazed area and natural light. Jansen windows and doors are a high-quality choice for buildings that require high standards of safety, aesthetics and insulation.

Aluser's experience and expertise, guides you in choosing Jansen systems to ensure flawless results.

design of steel windows and doors for architectural firms and interior designers

Aluser for Designers

Aluser for architects provides a service by advice also for the design of windows in steel. Our projects in Autocad support the development technician and the installation of the most complexes architectural elements. We also carry out inspections at costruction site to be sure to always give the customer the best. Discover our services for architects and interior designers.

Aluser Design Division

For the most complex design projects, the division Aluser Design proposes systems in metallic alloys, ranging from aluminium to steel, to meet any design requirement. Thin and minimal profiles proposals will give brightness and amplitude to any architectural project.

Starting with some of the thinnest windows and fixtures on the market, at Aluser, a window and door fitter in Milan, you can also find armored entry doors and designer interior doors for total continuity and harmony with your home.

tax deductions on aluminum windows wood aluser

Tax Credit for Energy efficient windows 2024

In addition, this is the best time to change the windows and doors because the ecobonus has been extended, which provides a tax deduction of 50% on the total expenses incurred to replace the windows and doors. Find out more about the 50% window tax deduction.

Discover our Realizations

Penthouse in Milan

Private residences

Headquarters and Campus of Reti Spa

Ristrutturazioni / Realizzazioni commerciali

Schuco windows and doors for a designer home

Ristrutturazioni / Residenze private

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