Mr-Glass Home Additions & ADU Nationwide

Mr-Glass Home Additions & ADU: The Sunnyvale Owner’s Guide

We stock and install Mr-Glass-compatible glazing systems for home additions and ADU projects in Sunnyvale, with typical installed pricing from $45,000 to $130,000 for full additions and $90,000 to $220,000 for detached ADUs. Most Mr-Glass specification reviews and material orders ship within 48 hours once we finalize your glazing schedule. Sunnyvale owners usually discover an issue when condensation appears between panes in a recently installed sliding wall system, or when the low-E coating shows visible degradation after two to three summers of direct south county sun exposure.

Call (650) 405-3637

Mr-Glass, a Canadian manufacturer known for thermally broken aluminum frames and multi-point locking hardware, is often specified by architects for the large-format openings common in modern Sunnyvale ADUs. The aluminum expands roughly twice as much as vinyl per degree of temperature swing, which matters in Santa Clara County where a single March day can swing 35 degrees. We’ve handled Mr-Glass warranty claims and aftermarket replacements across Lakewood Village and the Washington Park corridor since these systems first appeared in local plansets around 2016.

Which Mr-Glass Models This Applies To

Mr-Glass produces several product lines relevant to residential additions and ADUs, and the part you need depends on the series stamped on the frame edge or recorded in your permit documentation. The MG-5000 Thermal Series, identifiable by the 2-5/16 inch frame depth and dual durometer bulb gasket, is the most common specification we see in Sunnyvale’s permitted ADU stock plans. The MG-7000 Architectural Series uses a 3-inch frame depth and heavier wall extrusion, typically reserved for openings over 120 inches wide where structural deflection becomes a design factor.

To identify your exact unit, check the etched code in the glass corner (usually the interior lower right) or the paper label between panes if the unit is still sealed. The critical compatibility gotcha: MG-5000 and MG-7000 use different glazing bead profiles, 3/4 inch versus 1 inch, and the snap-in vinyl strips are not interchangeable. We’ve seen two Sunnyvale homeowners this past year order the wrong bead set online, discover the misfit mid-install, then call us to complete the job with the correct OEM profile.

For replacement IGUs (insulated glass units), Mr-Glass OEM units come with the company’s standard ten-year seal warranty. Quality aftermarket equivalents from Cardinal or Guardian meet the same NFRC performance ratings and typically carry comparable warranties at 15 to 25 percent lower material cost. We quote both options line-item so you can decide.

Signs Your Mr-Glass Home Additions & ADU Is Failing

• Fogging or condensation between panes. This indicates seal failure in the IGU, where the edge spacer has lost its butyl bond and moist Santa Clara Valley air has entered the airspace. The desiccant inside the spacer becomes saturated, and the clouding will worsen until the thermal performance drops measurably.
• Visible low-E coating degradation. Mr-Glass units use a soft-coat low-E surface on surface #2 or #3; if you see a hazy iridescent pattern that wipes clean from the exterior but returns, the coating may be oxidizing due to micro-fractures from thermal stress cycling.
• Hardware drag or multi-point lock misalignment. The aluminum frame expands and contracts daily; after several years, the stainless steel locking rods can bind against the zinc keepers. In Sunnyvale’s dry summers, lack of lubrication accelerates this wear, and forcing the handle risks snapping the internal actuator.
• Glazing bead popping loose. The vinyl snap-in beads harden and shrink with UV exposure, particularly on west-facing units that catch afternoon sun over the Diablo Range. Once a section releases, the glass edge loses its setting block support and the unit becomes a safety concern.
• Air infiltration at the sash meeting rail. The wool pile weatherstrip compresses permanently over time, and replacement requires removing the active sash, a procedure that demands proper support because a 60-by-96 inch dual-pane unit weighs roughly 180 pounds.

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Replacement Cost & What’s Included

What drives the range: unit dimensions, floor-level versus second-story access, whether your original installation included structural clips that we can reuse, and whether Sunnyvale’s current energy code triggers upgraded glass packages beyond your original spec. Under Clause 1 of The Haven Standard, you receive a written line-item quote before any work starts, material costs separated from labor hours and any subcontractor scope. Our 365-Day Done Right Promise covers the installation and hardware; OEM glass carries the manufacturer’s seal warranty, which we document and register on your behalf.

DIY or Call Us?

There’s a safe middle ground and a hard stop. An owner can verify the model stamp, photograph the failed area, and check the interior weep holes for debris, which is the most common cause of minor water intrusion. You can also confirm whether the issue is seal failure (fogging between panes, which never wipes clean) versus surface condensation (wipes clean, indicates humidity control).

The hard stop is anywhere a glass unit must be removed from its frame. Dual-pane IGUs are heavy, brittle, and under structural load even when “loose.” A 180-pound unit with compromised setting blocks can shift without warning, and the sharp aluminum frame edge is unforgiving. We do not recommend DIY removal, and we will not sell an IGU “for customer installation” because the liability is real and the savings are usually erased by one chipped corner or failed re-install. Call (650) 405-3637 and we’ll scope the opening, quote the replacement, and handle the disposal.

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