The starting price for a Therma-Tru exterior door varies by material, but entry-level steel doors start around 200 to 400 dollars for slab, and fiberglass doors start around 300 to 600 dollars for slab, with pre-hung systems starting higher. For Therma-Tru steel entry doors, which are most affordable, starting price for 36x80 slab with no glass is around 200 to 350 dollars materials at Home Depot and Lowes, and pre-hung steel system with frame, weatherstripping, and sill is around 400 to 600 dollars materials. For Therma-Tru Smooth-Star fiberglass doors with smooth surface meant for painting, starting price for slab is around 300 to 500 dollars materials, and pre-hung system 500 to 800 dollars. For Therma-Tru Fiber-Classic fiberglass doors with wood grain texture, starting price for slab is around 400 to 600 dollars materials, and pre-hung 600 to 900 dollars. For Therma-Tru Classic-Craft premium fiberglass with most authentic wood grain, starting price for slab is around 500 to 800 dollars materials, and pre-hung 800 to 1,200 dollars. Prices increase with glass options, sidelites, transoms, and factory finishing adding 100 to 500 dollars. Installation labor adds 200 to 500 dollars. So starting price for basic Therma-Tru exterior door is around 200 dollars for steel slab and 500 dollars for fiberglass pre-hung.
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