Napa’s Premier Provider for the Finest Quality Steel Windows & Doors

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For the finest Napa windows and doors, you needn’t look any further than Portella! Since 1999, our company has provided award-winning service to the residents of Napa.

No other company makes custom steel windows and doors as well-designed as we do. Fashion and function are effortlessly combined to create unique, eye-catching designs that are aesthetically pleasing and add a sense of class to your home or business.

How Custom Steel Windows & Doors Benefit Napa Businesses

Custom steel doors are a great energy-saving option for businesses. They prevent natural heat from escaping and keep your space at the perfect temperature.

Another benefit of custom steel doors is that they require minimal maintenance because steel is corrosion-resistant, durable, and will last for years. Our custom steel doors in Napa provide a high-quality, affordable alternative to traditional building materials.

Best of all, the attractiveness of custom steel doors makes them well-matched to modern aesthetics. Portella’s steel doors come in a variety of colors so you can pick the one that best suits your decor and theme. You’ll be able to create an open and welcoming atmosphere for your customers or guests without sacrificing privacy or security.

The Thermal Window Difference

Portella’s thermally broken steel windows with low-e glass and recycled material are designed to help you save on your energy bill.

A low-e coating on the inside of a window reflects warmth back into the room to reduce thermal loss from the indoors to the outdoors during the cold winter months.

Thermal windows also minimize sound bleedthrough, which allows you to enjoy the room with next to no noise from outside.

Portella Announces The Contemporary 3-D Metal Door

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Portella Product Lines

Storefront Interior & Storefront Exterior

We offer a variety of sleek and modern door and window designs, perfect for any type of business on a tight budget.

Napa relies on Portella’s Storefront Interior and Exterior lines to help transform unremarkable properties into dazzling places of business.

Thermally Broken

Enjoy the latest thermal technology combined with flawless aesthetic design with thermally broken windows by Portella. The result is the cleanest, most energy-efficient steel windows and doors in Napa.


With our range of custom metal frame doors and glass doors, you can achieve a unique sense of refinement, professionalism, and peace of mind. Portella’s classic designs integrate large expanses of glass into your design to achieve a look of modernity you won’t find anywhere else.

Portella's Superior Service Guarantee

When it comes time to replace your windows or doors, your personal Portella Project Manager is ready to make your design goals a reality with custom steel door and window designs to meet your needs.

Your project manager will follow up with you at every turn to ensure that your project stays on budget and on time.

Exceptional communication and customer satisfaction are key components of Portella’s mission, and we go above and beyond to make your project a success.


Our steel doors and windows are custom-created according to ANSI, NFRC, and AAMA specifications. We are committed to providing the best residential and commercial steel doors and windows in Napa by applying the highest standards in the industry.

Though there is a wide selection of pre-made options to choose from, the Portella team can also provide you with the perfect custom steel doors or windows to fit your needs. Portella’s residential and commercial steel doors and windows come in a variety of styles that are sure to please.

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What Makes Us Different?

We like to think we’re a little different when it comes to providing the finest quality steel windows and doors in Napa. Portella’s expert craftsmen know the ins and outs of the trade better than anyone and have proudly provided expertise and artistry to Napa residents and businesses for more than two decades.

Here’s what makes the Portella difference:

  • Custom steel window and door designs built by dedicated 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 industry-standard certifications from the ASTM, NFRC, and AAMA

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

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