Therma-Tru Fiber-Classic Mahogany Entry Door
You want the look of a stained mahogany front door and none of the sanding every third spring.
Reply within one business day. Or call / text 763-250-3621.
A Therma-Tru Fiber-Classic Mahogany entry door is a fiberglass door with a mahogany grain pressed into the skin, made to be stained so it reads as a dark wood door without the upkeep. It comes factory stained or ready to finish, with sidelites, transoms and decorative glass to match. JMB Builders measures, orders through ABC Supply and installs across the Twin Cities. Priced per door. Send photos and we reply within one business day, or book a free in-home estimate.
- Priced per door, Fiber-Classic Mahogany included
- Mahogany grain for stain, factory or on site
- Sidelites and transoms in the same grain
Fiber-Classic is Therma-Tru's original woodgrain fiberglass door, and the Mahogany collection is the one people pick when they want a dark, rich front door. The grain is pressed into the fiberglass skin in a mahogany pattern, so stain settles into it the way it would on wood. Under the skin is an insulating core, and the door is sold as a complete unit with its frame, sill and weatherstrip.
Finish is the main decision. Therma-Tru's factory stain comes in a set of colors from light to dark, and the door arrives finished. Or order it ready to stain and have it finished on site in a color of your own, quoted as a separate line, or leave it primed and caulked and finish it yourself. Glass designs run from solid panels to half, three-quarter and full lites, with decorative and privacy glass, and sidelites and transoms come in the same mahogany grain.
We measure the opening, order the door through ABC Supply, our supplier, and install it: old door and frame out, rot at the sill repaired, sill pan and flashing, the new unit shimmed at every hinge and screwed into the framing, foamed, sealed and trimmed. We are the installer. Options such as Therma-Tru's Oak collection, Classic-Craft and ProVia Signet can sit on the same quote.
Get a written quote for this job
Three photos and a sentence is enough: a reply within one business day, or ask for a free in-home estimate. Or text the photos to 763-250-3621.
What you supply
- Photos of the door inside and out, and a close-up of the sill
- Factory stain color, or ready-to-stain for a color of your own
- Panel design and glass: solid, half, three-quarter or full lite, with any sidelites or transom
- Hardware style and finish, and the swing you want
- Stain for the door if finished on site: Painting is quoted as a separate line — or leave it primed and caulked and paint it yourself.
What JMB supplies
- In-person measure of the opening, jamb width and swing before the order
- The Fiber-Classic Mahogany door unit, ordered through ABC Supply to that opening
- A quote with the door, the install, any rot repair and any finishing on separate lines
- Removal and haul-away of the old door, frame and threshold
- Rot repair at the sill, jamb feet or subfloor, quoted from what we find
- Sill pan, flashing tape, shims at every hinge, long screws into the framing, low-expansion foam and sealant
- Strike, sill and weatherstrip adjusted, and your hardware installed
- Exterior trim and interior casing, primed and caulked, and photos in your job folder
How it is priced: per door
Quoted in writing from your photos, with a reply within one business day. What moves the number:
- Factory stain vs. ready to finish
- Glass in the door, and sidelites or a transom with it
- Single door vs. a double door
- Hardware: a standard set vs. a handle set or multipoint lock
- Rot at the sill, jamb bottoms or subfloor
- Siding type at the opening: lap, stucco or brick
- Staining on site, quoted as a separate line
Send photos of the door inside and out and of the sill, and say whether you want factory stain or a color of your own. Lead time is written on the quote.
How long it takes
One Fiber-Classic door in a sound opening: about a day on site. Staining on site adds a return visit. Lead time depends on the order and is written on the quote.
How your project works
- 1
Send photos, get a written quote
Send three photos of the space and a sentence about what you want. You get a clear, itemized reply within one business day. Prefer a look in person? A free in-home estimate is always an option.
- 2
Pick materials, or bring your own
We help you choose profiles and materials that fit the house and the budget, or match your existing millwork exactly — or you buy the door or trim yourself and we install it. Everything is confirmed before the crew is scheduled.
- 3
Clean, precise installation
The crew shows up on time, protects floors and furniture, and installs with tight joints and consistent reveals. Photos of the finished work go in your job folder.
- 4
Walkthrough and invoice
We walk the finished work with you. If anything is not right, we fix it before we call the job done. Then one invoice, paid by check or direct deposit — no card fees, no payment links.
Situations and options
Factory-stained Mahogany
Pick one of Therma-Tru's stain colors and the door arrives finished, sidelites to match. Nothing to stain on site but the new casing.
Ready to stain, your color
Order it unfinished and stain it on site in a color you choose, as a separate line on the quote, or stain it yourself. All six sides of the slab get finished.
Mahogany door with a Shaker lite
Therma-Tru's flush-glazed Shaker designs in the Fiber-Classic line give a cleaner, newer look in the same mahogany grain, with sidelites to match.
Therma-Tru Fiber-Classic Mahogany Entry Door: questions, answered
Is the Therma-Tru Fiber-Classic Mahogany door real mahogany?
No. It is a fiberglass door with a mahogany grain pressed into the skin so it takes stain like wood. It will not rot, swell or need the refinishing a real mahogany door does in Minnesota weather. Stained, most people cannot tell from the sidewalk.
What is the difference between Fiber-Classic Mahogany and Fiber-Classic Oak?
Only the grain pattern. Mahogany has a finer, straighter grain that suits dark stains; Oak has a bolder grain that suits medium and light stains and matches oak trim. Both are the same door underneath, with the same glass and sidelite choices.
Does the Fiber-Classic Mahogany door come pre-stained?
Yes, with Therma-Tru's factory stain in a set of colors, so it arrives finished. Or order it ready to stain and have it finished on site in a color of your choice. Staining on site is a separate line on the quote.
How is Fiber-Classic different from Classic-Craft?
Classic-Craft is Therma-Tru's top line with a more detailed woodgrain and a larger glass and sidelite program. Fiber-Classic is the original woodgrain line at a lower price with the same complete-unit frame and seals. For a stained mahogany look, both work; Classic-Craft costs more.
Can the sidelites match the mahogany door?
Yes. Sidelites and transoms come in the same mahogany grain and take the same stain, and the glass can match the door's. The whole entry is ordered as one unit so it arrives framed together.
Where do you get Therma-Tru Fiber-Classic doors?
We order them through ABC Supply, our supplier, to the opening from our measure, and our crew installs them. If you already bought a Therma-Tru door, we install it labor only.
Recent JMB work, from our job log
59 installs recorded across 30 Twin Cities communities since Dec 2025. Window and door installs for homeowners and the builders we work with. Counts come straight from our job log; no customer names.
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Read morePage reviewed October 27, 2026 · JMB Builders LLC, MN license BC809005 · All doors pages
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Door Replacement & Installation near you
Based in Zimmerman, scheduling across the Twin Cities metro. Closest first: