Welcome to Tanner Circle — Where Craft Meets Conscience

A Rare Point of View

Your project is unique. Your point of view is specific only to you. We understand. Our point of view is also rare. At Tanner Circle, we believe that the highest standard of living and the highest standard of building are one and the same. Our family of companies — TANNER Windows & Doors, TANNER Building Products, and TANNER Construction — brings together decades of expertise to deliver building solutions of uncompromising quality. From thermally superior windows and doors to precision-engineered insulation systems and architecturally refined window shades, every product in our portfolio is designed to perform at the intersection of luxury and sustainability. We don't simply build structures; we craft environments that honor both the people who inhabit them and the world they exist within. Tanner Circle is the choice of those who refuse to compromise — on comfort, on beauty, or on their commitment to a more responsible future.

Every project begins and ends with a relationship. We understand that choosing the right building materials is not merely a technical decision — it is a deeply personal one, shaped by vision, investment, and an enduring legacy. That is why every client is met with dedicated, hands-on guidance from professionals who bring not only exceptional product knowledge but a genuine commitment to your outcomes.
We measure our success by yours. From the first consultation through final installation, our team works alongside you to ensure that every window, every door, every insulated envelope performs exactly as promised — and looks exactly as imagined. And because great buildings deserve lasting care, TANNER's exclusive maintenance contracts are designed to protect and preserve the integrity of your project for generations to come. When you engage Tanner Circle, you are not merely purchasing materials — you are securing a partnership built on trust, expertise, and an unwavering dedication to the enduring value of what you create.

We will work seamlessly with your architect, assisting with the selection of appropriate products, providing expert design detailing if required, and install each item with the care and attention it deserves. After the work is done, you can ensure optimal operation and lasting beauty with an exclusive maintenance contract. We will periodically inspect and service all products to keep them in optimal condition. Our personalized online client portal gives you direct access to your product information, a detailed maintenance schedule and repair request forms should attention be required. We’re always just a phone call away.

Meet our clients through the beauty of their realized vision…

Explore the TANNER Circle family of companies…

  • Das BioHaus Turns 20!

    TANNER Circle

    Read More about how the first Passive House certified building in the Americas came to be.

  • TANNER Building Products

    Formerly Peak Building Products. Get to know our circle of quality: We deliver European, high-performance building products, expertise, and installation to the US construction market like no one else can.

    “US Source for Innovative High-Performance Building Products”

  • Glass House at dusk illuminated from within.

    TANNER Windows and Doors

    Bring on the complexity – we’ll deliver stunning solutions!

    “Engineered and built in Europe for the Finest Architecture in America”

  • Two men atop a building under construction.

    TANNER Construction

    Klein aber Fein,” a German phrase that means “small but exceptional” is the value that inspires our team, projects we work on, and breathtaking results we achieve.

Meet the Tanners—your experts in high-performance design, building products and construction.

Stephan Tanner

I’m Stephan Tanner, a US-Swiss architect passionate about creating beautiful, energy-efficient buildings. To bring my visions to life, I've had to seek out the highest-performing products from around the world.

I’ve been involved in sustainable design for more than 30 years – in Europe and in North America – as an architect, as an owner, as someone who’s passionate about creating highly-efficient buildings.

When you bring such buildings to life – buildings that surpass North American sustainable design standards and achieve world-class certifications such as the German Passive House Standard – you need superior high-performance products. Since these innovative products are not available in the US, I continue to receive requests from visionary owners and building colleagues who want more information about these products and how to design, purchase and install them.

As such, I have the enjoyment and the shared love for the excitement of tackling complex building projects with my sons, Robert, principal of our Tanner Windows and Building Products, and Seth a passionate leader of our high-performance construction and installation team. Together, we translate complex building challenges into stunning architectural structures, along with our many partners and friends.

Take my business partner, Klaus Müller and his team in Germany, for example. They are one of our links to superior-quality, European-made products. I met Klaus in 2004 while searching for an expert to build the windows and doors for my design of the first certified Passive House in North America – das Bio Haus at Concordia Colleges Language Villages. After building the Bio Haus, I received calls from other like-minded people asking me where and how this came about, so I asked my son Robert help them out. It was then we knew we had to share these exciting new, high-performance building technology products with the North American construction market.

That's why I've helped bring this extraordinary vision to North America and why I'm excited to share the possibilities of the Tanner Circle with Tanner Windows & Doors, Tanner Building Products and Tanner Construction with you for your next projects.

Robert Tanner

I’m Robert Tanner, founder of Peak Building Products in 2008, now proudly named Tanner Building Products.

I believe our success in the luxury market is based on being environmentally conscious while keeping clear business goals in mind. I approach every new opportunity thinking about the people involved, products that can be used and the overall project objectives.

The German saying, “Klein aber Fein,” drives my commitment to deliver “quality versus quantity,” especially when it comes to superior service, high-performance products, and watching it all come together with amazing end-results and customer satisfaction.

Reaching for beautiful, comfortable, and uncompromised sustainable building solutions? Reach out to me. I’ll help your Team and Client make your vision a reality as I’ve been doing since 2006.

Seth Tanner

I’m Seth Tanner, founder of Tanner Construction in 2014. Whether it’s building for residential owners or serving as a general contractor on high-performance projects, I take pride in precision in all we do.

Which is why we don’t take on all projects. Only those where an owner or contractor is as committed to quality, performance, and a beautiful building as much as I am. I thrive on collaborating with like-minded partners in these ways.

Working on projects with my father, Stephan and my brother, Robert, I share the love and the excitement of tackling complex building projects.

The German saying, “Klein aber Fein,” is all about “small but sweet” for me. I love rolling up my sleeves, diving into the details of a challenging, high-performance installation in unique construction sites, then pushing through to deliver awe-inspiring results. It’s this gritty glamour of my work that I love best: achieving success and feeling happy because my customers are.