(260) 768-4410
Serving Northern Indiana & Southern Michigan

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Here at Alpha Building Center, we stock and build Therma-Tru entry doors. Our door shop is stocked with many different door styles, glass options, and Jamb options. If you're not finding the exact door you need, come in or give us a call and we'll service you to the best of our ability.

The Therma-Tru Difference


Backed by more than 50 years of industry experience, Therma-Tru offers complete door systems engineered with craftsman precision.


As a homeowner, you want to make sure that any product you purchase is backed by the manufacturer who produced it. At Therma-Tru we stand firmly behind the quality and durability of our doors, and are ready to back up that promise to you with some of the most comprehensive warranties in the industry.


A Therma-Tru door with genuine Therma-Tru components is more than a beautiful door — it’s a complete door system. Every Therma-Tru full system residential entry door or patio door is backed by the industry’s most comprehensive lifetime limited warranty. In addition to the great style, easy installation, and durability of your new Therma-Tru Door, you can have complete peace of mind knowing that your investment is protected.

Therma-Tru fiberglass doors are available with our exclusive Tru-Defense system as an option. It integrates specific components engineered and tested to deliver outstanding protection in all kinds of weather conditions. And it’s backed by a Warranty Rider that provides for cash reimbursement that may be used toward secondary damage to flooring and trim, and the labor to make repairs if water infiltration occurs.


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