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Mr-Glass Home Additions & ADU: The San Antonio Owner’s Guide
If your Mr-Glass home addition or ADU has a failed part, we stock and install compatible components across San Antonio, with full-project work on these structures typically ranging from $45,000 to $130,000 depending on scope. Most owners discover a problem through water intrusion, a door or window that has stopped sealing, or shifting in a corner where two structures meet. We are an independent service provider, not a factory-authorized Mr-Glass dealer, which means we match the right part to your structure rather than pushing a single product line.
Key Takeaways
- Mr-Glass enclosure parts fail most often at the connection points between the original home and the addition
- Our San Antonio pricing for Mr-Glass-compatible repair and replacement work runs $45,000 – $130,000 for full home additions, with smaller component fixes billed by scope
- We carry common Mr-Glass seals, glazing stops, threshold caps, and panel connectors on our trucks
- OEM parts are matched by the serial plate on your enclosure frame; if that plate is missing, we measure the extrusion profile
- Every quote is written, fixed, and delivered before work starts, with the 365-Day Done Right Promise behind it
Which Mr-Glass Models This Applies To
Mr-Glass enclosures come in several frame series, and the part that fits one won’t always fit another. The most common lines we see in San Antonio are the MG-200 and MG-400 series, which differ in extrusion depth. A quick way to identify your series: measure the width of the aluminum frame at the door jamb. The MG-200 measures 2 inches; the MG-400 measures 4 inches. That one measurement eliminates about half the wrong parts before we order anything.
Look for the serial plate on the vertical frame near the handle side of the door, usually about knee height. It will list the model, manufacture date, and glass package. If that plate is gone, we work from the extrusion profile and the corner key design, which are distinct enough that a trained eye can identify the series in a few minutes.
For most Mr-Glass parts, we recommend OEM. The factory still supports these frames, and aftermarket equivalents in seals and rollers often use softer compounds that wear faster in South Texas heat. That said, there is one exception: aftermarket silicone glazing tape from a specification-grade manufacturer actually outlasts the original Mr-Glass tape in San Antonio’s UV exposure, particularly on west-facing enclosures. We stock both and will tell which one makes sense for your wall orientation.
Styles & brands we work with
Signs Your Mr-Glass Home Addition or ADU Is Failing
- Water pooling at the threshold after rain. The threshold cap gasket compresses over time and loses its rebound, especially in San Antonio’s clay soil that shifts with every wet-dry cycle. The fix is usually a cap and gasket replacement, not a new threshold.
- Door drags or binds when opening. The roller carriers wear unevenly, and on heavier Mr-Glass doors the nylon wheels flatten on one side. If you have to lift the handle to close it, the rollers are done.
- Condensation or fog between glass panels. The seal on an insulated glass unit has failed. Once the desiccant inside the spacer is saturated, the panel can’t be resealed from the outside. It requires a new IGU, or glass pack.
- Visible gap where the addition wall meets the original house. This is the most common failure we repair. Mr-Glass enclosures tied to a primary structure use a flexible transition channel; if that channel pulls loose, water and pests get in. In San Antonio’s seasonal ground movement, we see this gap open up within 5 to 8 years of installation.
- Drafts or whistling noise around the door panels. The wool pile weatherstripping in the vertical stiles compresses permanently, and once compressed, it can’t recover. Replacing the pile strip is a fast, inexpensive fix that makes a real difference in cooling costs during a San Antonio summer.
See the difference
Before
After
Before
After
Before
AfterReplacement Cost & What’s Included
Full Mr-Glass home addition project in San Antonio: $45,000 to $130,000, including framing, glass, finish work, and all permits. ADU construction on the same enclosure system: $90,000 to $220,000. Component-level repairs fall into narrower bands: a threshold cap and gasket swap runs $250 to $600, a replacement roller carrier $180 to $400 per panel, and an insulated glass unit replacement $500 to $1,800 depending on size and glass package.
Every quote we write lists the part cost and labor separately. You’ll know what the component costs and what the crew costs to show up. The written price we deliver before work starts is the price you pay, with no surprise line items later. Our work carries the same 365-Day Done Right Promise as every project we take on in San Antonio.
| Repair Scope | San Antonio Price Range |
|---|---|
| Threshold cap & gasket replacement | $250 – $600 |
| Roller carrier replacement (per panel) | $180 – $400 |
| Insulated glass unit replacement | $500 – $1,800 |
| Weatherstripping replacement (full door) | $150 – $350 |
| Transition channel re-seal (structure-to-house) | $400 – $1,500 |
| Full home addition (Mr-Glass enclosure) | $45,000 – $130,000 |
| ADU construction | $90,000 – $220,000 |
DIY or Call Us?
Most Mr-Glass part failures are not dangerous to inspect. You can safely check for gaps at the threshold, look for fogged glass, and feel for a drag when the door moves. The thing you should not do is pull apart a panel or try to remove glass from the frame. Mr-Glass extrusions hold glass under tension, and a cracked panel in your hands is a much more expensive problem than the part you were trying to save a few dollars replacing.
If the issue is a drafty door edge, call us and describe what you’re seeing. We’ll tell you over the phone whether it sounds like weatherstripping or something structural, and whether a service visit makes sense. The estimator is free, and the fix is usually done in one trip. Call (254) 269-5071.
FAQs
Seals and weatherstripping on Mr-Glass enclosures last 5 to 8 years in the San Antonio climate; the glass itself can outlast the framing if the seals are replaced on schedule and the transition channel stays sealed. Our experience from San Antonio jobs is that the first part to fail is almost always the threshold gasket on south- and west-facing exposures.
Some Mr-Glass parts can be repaired, but most are designed as replacement items. Wool pile weatherstripping can’t be restored once compressed; threshold caps and roller carriers are cheap enough that repair makes no financial sense. Call (254) 269-5071 and describe what’s failing, and we’ll give you our honest read.
Most single-part replacements, like a threshold cap or weatherstripping, take under two hours from the time our crew arrives in San Antonio. A full glass unit replacement typically takes a half day because we have to disconnect the panel, lift the IGU into place, and reset the glazing tape.
We stock the most common Mr-Glass seals, gaskets, threshold caps, and roller carriers on our trucks. For less common parts, we order direct from Mr-Glass suppliers with a 2 to 5 day lead time. Call (254) 269-5071 and give our dispatcher your serial plate number, and we’ll confirm availability before we schedule anything.
Written by Isaac Pruett, Owner, Mason Remodeling Co San Antonio at Mason Remodeling Co San Antonio, serving San Antonio and nearby areas.
