San Jose's Premier Provider for the Finest Quality Steel Windows & Doors

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San Jose Custom Steel Windows and Doors

Since 1999, Portella has gone the extra mile to provide our friends, neighbors, and loyal customers with the finest custom steel windows and doors in the San Jose area.

You won’t find a collection of steel windows and doors as expertly engineered as ours.

Benefits of Custom Steel Doors

Among the many benefits of custom steel doors for businesses is the security and peace of mind they provide. Steel is nearly indestructible, so it serves as a great theft deterrent for would-be burglars or vandals. 

Another benefit of steel doors is their durability. A custom steel door can withstand large, heavy items moving in and out of the building on a regular basis. 

Lastly, custom steel doors are very well insulated and therefore very energy-efficient. The thermal coating incorporated in Portella’s steel doors ensures maximum durability and tensile strength, which will keep air conditioning and heating costs low.

The Thermal Window Difference

Thermal windows are a very cost-effective option for homes and businesses. Portella’s low e-glass thermally broken steel windows are designed to minimize the effects of UV rays and are made from recycled metal. 

Thermal windows also do a great job warming your home in the wintertime. They have UV coatings on both the inside and outside to ensure heat reflects back indoors.

Portella Announces The Contemporary 3-D Metal Door

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Portella Product Lines

Storefront Interior & Storefront Exterior

Portella’s Storefront Interior and Exterior lines add just the right amount of class and sophistication to the businesses of San Jose.

Our vast array of modern steel and glass door and window models are a great option for businesses both large and small, even if you’re on a tight budget. 

Thermally Broken

Portella’s thermally broken windows combine function (using the latest thermal glass technology) with a stunning aesthetic design. The thermally broken steel windows and doors selection is the most energy-efficient option you’ll find in San Jose.


Achieve a subtle yet elegant look for your home or business with our range of Classic metal frame doors. Portella’s classic designs incorporate large glass expanse into the design to achieve the spacious, brightly-lit interior room tone. Many architects and modern homeowners seek this style.

Portella's Superior Service Guarantee

When it’s time to replace your windows or doors, your friendly, knowledgeable Portella Project Manager is ready to assist you. We’ll help you find custom steel door and window designs to meet your needs. Our manufacturing process is custom-tailored around your design goals. 

Fashion and function are deftly interwoven to create unique, cutting-edge designs to beautify your home or business. 

From the initial quote process to the shop drawing mockups, you can rest assured that you’ll always be up to date on the status of your project. 

Clear and concise communication is a cornerstone of Portella, and we adhere to this standard each and every day.


Portella’s steel windows and doors are built according to the highest standards in the industry (ASTM, NFRC, and AAMA specifications). It’s because of our steadfast dedication to quality that we can continually provide the highest quality residential and commercial steel doors and windows in San Jose.

Looking for a custom solution? No problem! There is a wide selection of pre-made options to choose from, and the Portella team can provide you with custom steel doors or windows to fit your needs.

Our collection of expertly engineered, aesthetically pleasing commercial steel doors and windows means that there’s something for everyone!

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What Makes Us Different?

Our goal at Portella is simple; to provide the finest quality steel windows and doors in San Jose. Our expert artisans know the ins and outs of the trade better than anyone. For over two decades, they have proudly provided expertise and artistry to San Jose residents and businesses.

Here’s what makes the Portella difference:

  • Built-to-order steel window and door designs by highly skilled craftsmen
  • 44,000 square feet of state-of-the-art manufacturing space
  • In-house transportation fleet
  • Steel doors and windows manufactured using a zinc-bonded galvanizing technique method with only 100% recyclable steel that you won’t find anywhere else
  • Exceeding expectations with certifications from the ASTM, NFRC, and AAMA

Contact us today to learn what the Portella difference means for your next steel window or door project!

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