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Therma-Tru Exterior Doors

A Smart Investment

Lifetime Limited Warranty

We stand behind more parts, and for longer than other door companies because we make or specify everything that goes into our door system. A Therma-Tru fiberglass door system is backed by the industry’s most comprehensive lifetime limited warranty.

Energy Efficiency

In any region or climate, energy efficiency is key. More than 80% of Therma-Tru door and glass options are ENERGY STAR® qualified and National Fenestration Rating Council (NFRC) certified, helping save money on energy costs.


Quality Testing

Our doors, glass and components are held to high standards. We conduct thorough testing to help ensure that our product will live up to a homeowner’s toughest quality performance expectations.


Features and Benefits

  • More than 55 years in the business with a proven track record
  • Complete door system with components engineered to work together at critical points
  • Total confidence in a lifetime limited warranty, the most comprehensive of its kind covering glass, doors, and components
  • Thousands of door styles and wide array of glass designs
  • Award-Winning Consumers Digest Best Buy

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About Us

Why Builders Recommend Allegheny Millwork & Lumber

Our reputation for quality and excellence is why you should choose Allegheny Millwork & Lumber.  Our staff is highly knowledgeable and friendly.  We will help guide you through the myriad products when you are building or renovating your home.

From building materials to fine finishes, we have you covered.  Beautiful doors create a welcoming entrance to your home.  Crystalline windows and gargantuan patio doors can grace your property, framing the view and keeping you protected from the elements.  Our experts can help you make the decisions when choosing what is right for you.  No project is too big or too small.  Come see why the best contractors in Pittsburgh have been using Allegheny Millwork & Lumber for the last 40 years.

With over 350 moulding profiles in stock, we can adorn your windows and doors, ceilings, walls, and floors with quality woodwork to put your own stamp on the project at hand.  We can also match existing millwork to complete your historical renovation.

Additionally, we will help you design the kitchen of your dreams.  We encourage you to make an appointment in our 10,000 square feet design showroom.  You can also visit our virtual showroom by clicking on the link to the right  We hope to see you soon!