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Therma-Tru Home Additions & ADU: The Orlando Owner’s Guide
When an Orlando homeowner calls us about a Therma-Tru home addition or ADU, they’re usually past the browsing stage. They’ve got a door or window unit that’s underperforming, a project that stalled, or a failed component that’s throwing off their timeline and their budget. Installed pricing for Therma-Tru-compatible home additions in Orlando runs $45,000 to $130,000, with ADU construction typically landing between $90,000 and $220,000 depending on scope. We stock Therma-Tru parts on our trucks for the most common failure points, and we can usually match your existing door or window hardware the same week. The part most people discover has failed first? The weatherstripping and threshold assembly on exterior door systems. Florida humidity and daily sun exposure harden those seals faster than most manufacturers expect, and once that seal goes, the door starts leaking air, water, or both. That’s the call we get most often. Tell me what the problem is. We’ll figure out the rest from there.
Which Therma-Tru Models This Applies To
Therma-Tru builds exterior door systems under several lines, and the compatibility question matters more than most Orlando homeowners expect. The Smooth-Star, Fiber-Classic, and Pulse lines each use different slab constructions and hinge preparations. A Smooth-Star hinge prep won’t always match a Fiber-Classic slab without re-mortising, and that’s the kind of detail that turns a simple door swap into a three-day project if you order the wrong part. The identifying label is usually on the hinge edge of the door slab, printed or embossed with the series name and a manufacturing date code. If the label’s gone, measure the slab thickness: Therma-Tru exterior doors run 1-3/4 inches thick across most residential lines, but some older Classic-Craft units measure 2-1/4 inches. For OEM versus aftermarket, we recommend OEM on anything structural: door slabs, frame assemblies, and multipoint lock systems. Aftermarket equivalents work fine for weatherstripping, sweeps, thresholds, and hinge screws. We stock both. One Florida-specific reality: Therma-Tru’s standard weatherstripping is rated for northern climate cycles. In Orlando’s humidity, that same seal often hardens and loses compression within 5 to 7 years instead of the 10-plus you’d see in drier climates. We swap in an upgraded compression seal that holds up better here.
Styles & brands we work with
Signs Your Therma-Tru Home Additions & ADU Is Failing
- Visible daylight around the door perimeter. The weatherstripping has compressed or the door slab has shifted out of alignment. In an Orlando summer, that gap is pulling conditioned air out and humidity in, and your AC bill notices before you do.
- The door sticks or drags at the threshold. Fiberglass and composite door slabs expand and contract with Florida’s humidity swings. When the slab binds, the threshold inserts and corner seals are working against the door instead of sealing it.
- You can hear street noise or the neighbor’s dog through the door. Therma-Tru doors are built around their polyurethane foam core. When the perimeter seal fails, that sound isolation drops noticeably. It’s a sign the door is no longer compressing into the frame gaskets.
- Water staining or soft spots at the door corners. This one’s serious. It means the sill pan flashing or the threshold’s capillary break has failed, and water’s getting behind the frame. In Orlando’s afternoon thunderstorms, this failure mode accelerates fast. We’ve opened door frames in College Park and found rot in the subfloor by the time the homeowner saw a stain.
- The multipoint lock binds or won’t engage both bolts. Therma-Tru doors fitted with multipoint lock systems depend on precise frame alignment. When the door settles or the hinges wear, the top bolt stops lining up with its strike. The door still locks, but you’ve lost the security you paid for.
See the difference
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AfterReplacement Cost & What’s Included
Let’s talk numbers. A full Therma-Tru door system replacement in Orlando, parts and labor, runs $2,800 to $7,500 depending on the series, size, and whether we’re pulling the old frame or retrofitting into the existing opening. A threshold and weatherstripping refresh runs $250 to $650. Hardware swaps (multipoint lock, handlesets, hinge replacement) run $150 to $900 installed depending on the hardware grade. Here’s the breakdown for common Therma-Tru work in Orlando:
- Full door slab + frame replacement: $2,800 – $7,500
- Door slab only (retrofit to existing frame): $1,200 – $3,200
- Threshold and seal replacement: $250 – $650
- Multipoint lock replacement: $400 – $900
- Weatherstripping and sweep refresh: $120 – $300
- Full ADU door package (entry + patio + interior): $6,000 – $18,000
What drives the range? Door size and swing, frame condition, and whether the existing rough opening is square. Older Orlando homes, especially those 1960s block homes in neighborhoods like Conway or Audubon Park, often have rough openings that have settled out of square. Straightening that adds labor. Every quote from Mason Remodeling Co Orlando is a written price before we start, and it covers parts, labor, haul-away of the old unit, and a 365-day workmanship warranty from the completion date. No change orders unless we find something structural you didn’t know about, and we’ll show you what we found before we touch it.
DIY or Call Us?
Here’s the honest split. You can safely check the weatherstripping, clean the threshold track, and tighten hinge screws yourself. That solves maybe 15% of the door issues we see. What you should not do is attempt a Therma-Tru slab replacement without experience. These doors are heavier than they look, and a fiberglass slab dropped on a foot or a misaligned frame will cost more than the labor you were trying to save. Door work in general isn’t the danger that a garage spring or an electrical panel is, but a full door system replacement is a two-person job with real risk of injury and expensive mistakes. If the issue is a worn seal or a sticky sweep, that’s a quick fix you can handle. If the door’s out of square or the frame shows water damage, call us at (850) 920-7745. Isaac Pruett has been handling these exact repairs across Orlando for years, and he’d rather tell you straight whether it’s a $300 seal job or a $4,000 frame replacement than have you guess.
FAQs
In Orlando’s climate, a Therma-Tru door system typically lasts 20 to 30 years for the slab and frame, but the wear components (weatherstripping, sweeps, thresholds) generally need replacement every 5 to 7 years due to humidity and UV exposure. The foam core and fiberglass skin hold up well. The seals do not.
Yes, most of the time a Therma-Tru door can be repaired if the slab and frame are structurally sound. We regularly replace thresholds, rebed hinges, re-align frames, and swap out lock hardware. Replacement is only necessary when the frame has rot or the slab has been physically damaged.
A straight slab swap into an existing frame takes about 3 to 4 hours on site. Full frame replacement with new trim and hardware usually takes a full day, sometimes two if the rough opening needs correction. ADU door packages across multiple openings run 3 to 5 days depending on scope.
Yes, Mason Remodeling Co Orlando stocks the most common Therma-Tru wear parts on our trucks: weatherstripping, sweeps, thresholds, hinge screws, and strike plates. For series-specific slabs and frames, we order directly and usually have them within 3 to 5 business days. We also keep parts for KraftMaid, Cambria, and Silestone lines on hand for other project scopes.
If you’ve got a Therma-Tru door that’s fighting you, call (850) 920-7745. We’ll schedule a free estimate, put the price in writing, and show you exactly what’s wrong before we touch a single screw.
Written by Isaac Pruett, Owner, Mason Remodeling Co Orlando at Mason Remodeling Co Orlando, serving Orlando and nearby areas.
