Mr-Glass Home Additions & ADU Nationwide

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

We stock and install Mr-Glass-compatible window systems for home additions and ADU projects in Oakland, 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 window replacement and integration work is scheduled within 48 hours of written quote acceptance. Homeowners usually discover a problem when condensation appears between panes in a converted garage ADU, or when the original single-pane Mr-Glass units specified in a 1980s Fruitvale addition start leaking at the sill during Oakland’s winter storms.

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Which Mr-Glass Models This Applies To

Mr-Glass has manufactured window systems under several product lines over the decades, and matching the right unit to your addition or ADU frame matters. The most common we encounter in Oakland are the MG-200 series (vinyl-framed, double-hung, 1995-2010), the MG-300 thermal-break aluminum line (2005-present), and the older MG-100 single-pane units still found in pre-1990 conversions around Maxwell Park and Redwood Heights. Check the etched mark in the glass corner or the sticker on the frame jamb; the series prefix tells us the frame depth, which determines whether a direct replacement fits or the opening needs reframing.

OEM Mr-Glass units are available through select distributors, but we often spec quality aftermarket equivalents from our vetted brand list, including KraftMaid-compatible trim packages and Cambria or Silestone surrounds when the addition includes a kitchenette or bath. The aftermarket IGUs (insulated glass units) we source carry the same NFRC ratings and often beat OEM lead times by two to three weeks. For ADUs subject to Oakland’s energy compliance checks, we verify the U-factor and SHGC on the label before ordering; we’ve seen homeowners stuck with a failed inspection because a “matching” window lacked the documented performance data the city requires.

Signs Your Mr-Glass Home Additions & ADU Is Failing

• Fog or condensation between panes. The edge seal on the IGU has failed, allowing moisture into the air gap. In Oakland’s marine climate, this accelerates once the desiccant inside the spacer is saturated; the window still blocks wind but has lost most of its insulating value.
• Water staining at the sill or drywall below. The weep holes are clogged with debris, or the sill pan was omitted during original installation. We see this often in hillside ADUs where wind-driven rain hits the window directly; the water has to go somewhere, and it’s usually inward.
• Difficulty opening or closing, or the sash won’t stay up. The balance system has worn out, or the vinyl frame has warped from UV exposure. On south-facing additions in the Oakland hills, we’ve measured frame distortion of 1/8 inch or more after fifteen years of sun.
• Draft even when closed and locked. The weatherstripping has compressed or torn, or the interlock between meeting rails has gapped. This is common in rental ADUs where tenants have been less gentle with operation than an owner-occupant would be.
• Cracked glass with no impact point. Thermal stress fracture from uneven heating, usually on windows with partial shading from eaves or trees. The crack runs perpendicular to the stress edge, and the pane needs full replacement; patching is not an option.

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Replacement Cost & What’s Included

Mr-Glass window replacement within an existing addition or ADU in Oakland runs $450 to $1,200 per opening for standard sizes, with full addition projects ranging $45,000-$130,000 and detached ADU construction at $90,000-$220,000 depending on scope, foundation, and utility tie-ins. What drives the spread: frame condition (rotted sill = reframing), access difficulty (second-story hillside ADU with no driveway), and whether the project triggers Oakland’s mandatory green building requirements or rent control registration for the new unit.

Our quote is a flat written price with line-item scope before any work starts, per Clause 1 of the Haven Standard. Parts, labor, disposal of old units, and the documented photo record are included. We pull permits and pass inspections as part of the scope; no change proceeds without a signed change order. The 365-Day Done Right Promise covers the installation, and manufacturer warranties on the glass and frame transfer to you.

DIY or Call Us?

There’s a safe middle ground here. An owner can check the model number, clear weep holes with a pipe cleaner, and verify that water is draining out the exterior. What goes wrong past that point: IGUs are heavy and the sealant bond requires controlled pressure; improper handling cracks the replacement glass before it’s ever installed. For additions and ADUs, the bigger risk is the permit and inspection chain. Oakland requires a building permit for window replacement that alters the opening size or involves structural modification, and most ADU work triggers additional housing code review. We’ve been called in after DIY installations failed inspection and the homeowner had to pay twice for the same opening. If you’re weighing the work, call us at (628) 300-4376 for a free written estimate; we also offer a free second opinion on any competitor’s written quote.

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