Therma-Tru Home Additions & ADU Nationwide

Therma-Tru Home Additions & ADU: The Fort Lauderdale Owner’s Guide

If you’re planning a home addition or ADU in Fort Lauderdale and want Therma-Tru doors or entry systems integrated into the build, you’re looking at a full-project range of $45,000 – $130,000 installed, with the Therma-Tru components typically accounting for $2,000 – $8,000 of that depending on how many entry points and what series you choose. We install and finish Therma-Tru door systems inside the larger addition scope we build. The work isn’t a one-day parts swap; it’s a structural project where the door package gets specified early so the rough opening, flashing, and trim all land correctly.

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Most homeowners don’t discover their Therma-Tru part has failed until they either notice daylight around the door frame, feel the door dragging on the threshold, or find moisture staining the interior drywall after a Fort Lauderdale storm. By then the issue is rarely just the door skin or the weatherstripping. It’s usually the frame, the sill pan, or the way the original rough opening was flashed, and the fix goes well beyond replacing a sweep.

Here’s what this page covers: which Therma-Tru models we work with inside addition and ADU builds, what fails first in South Florida’s climate, honest pricing, and whether you should touch it yourself. We’re an independent general contractor in Fort Lauderdale. We are not affiliated with Therma-Tru, but we work with their products daily and know where they hold up and where they don’t.

Key Takeaways

• Therma-Tru door systems inside a Fort Lauderdale addition or ADU run $2,000 – $8,000 installed depending on series, size, and hardware.
• The full addition or ADU project is $45,000 – $130,000, and we scope the door package in from day one.
• Moisture intrusion at the sill and frame is the number one failure point in Broward County’s humidity and storm cycles.
• Rough opening and flashing mistakes are more common than door material failures.
• We provide written pricing before work starts, and every job carries our 365-Day Done Right Promise.

Which Therma-Tru Models This Applies To

We install and service the full Therma-Tru lineup as it applies to additions and ADUs: Classic-Craft, Fiber-Classic, Smooth-Star, and Pulse series. The decision that matters most for a Fort Lauderdale addition isn’t really the collection name; it’s the core material and the glazing package. For an ADU entry door, Smooth-Star is the value choice for renters or a guest suite. For a primary-suite addition where curb appeal matters, Classic-Craft mahogany grain with a coastal-rated glass insert is what most of our clients near Victoria Park and Coral Ridge end up choosing. The Pulse line adds a multi-point locking system and pre-hung frame engineering that we specify when the addition is on a slab with minimal overhang.

How do you identify what you already have? Look at the hinge edge of the door slab. Therma-Tru stamps a manufacturing code there, usually starting with a series abbreviation followed by a date. That code tells you the series, the glass cutout size if applicable, and the swing. If the stamp is gone or unreadable, measure the slab thickness in three places; Therma-Tru exterior slabs are 1-3/4″ thick, and anything less means you’re dealing with an interior door that was misapplied. For OEM replacements, the lead time on a custom Classic-Craft slab in Florida can run 4 – 6 weeks. Quality aftermarket slabs and frame components are available sooner, but the compatibility gotcha is the sill design. Therma-Tru frames use a specific adjustable sill profile that aftermarket sills rarely match exactly, and a mismatched sill is the fastest way to reintroduce a leak.

The one compatibility issue we run into repeatedly on Fort Lauderdale additions built between 2015 and 2020: original door installs used the old foam-filled Fiber-Classic frame, which has a slightly narrower jamb depth than the current model. If you’re replacing just the door and reusing that frame, the new slab will bind. You need either a current-generation frame or a slab machined to the old jamb spec. We handle that measurement on-site every time.

Signs Your Therma-Tru Home Addition or ADU Door Is Failing

• Water staining at the interior corners of the door frame. This is almost always a failed sill pan or missing backer rod under the sill. The door itself can still look fine while the rough opening below it rots out.
• The door drags or binds in the top corner opposite the hinges. In Fort Lauderdale, slab settlement and door frame movement are routine. What starts as a minor drag becomes a warped frame and a compromised weather seal within a season.
• Daylight visible around the perimeter when the door is closed. That means the weatherstripping is compressed or the frame has moved. Either way, conditioned air is escaping and water has a path in during a summer storm.
• Deadbolt misalignment that worsens every few months. A lock that needs upward pressure to engage is telling you the jamb has shifted. Tightening screws only works until the underlying settling catches up again.
• Softness or sponginess in the threshold when you step on it. The sill has water damage. By the time you feel it, the structural framing underneath typically needs repair or replacement before a new door goes in.

Replacement Cost & What’s Included

For a Therma-Tru door replacement within an existing Fort Lauderdale addition or ADU, plan on $2,000 – $8,000 installed. That covers the slab, frame work, new sill pan, flashing, weatherstripping, hardware, and finish trim. Where you land in that range comes down to series, glass package, whether we’re resizing the rough opening, and how much framing repair the moisture has caused. A basic Smooth-Star replacement in a solid opening on the lower end. A Classic-Craft with a overhang design that requires reframing and stucco patching on the higher end.

If you’re building a new addition or ADU and the Therma-Tru system is part of the original scope, the door package is a line item inside the $45,000 – $130,000 total project. We don’t bury door pricing in a lump sum. You get a written line-item breakdown before any work starts. The number we quote is the number you pay; there are no change orders unless you change the scope. Every Therma-Tru installation we do carries a one-year workmanship warranty through our 365-Day Done Right Promise, on top of the manufacturer’s coverage on the door itself.

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