Free written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
Mr-Glass Home Additions & ADU: The San Diego Owner’s Guide
We repair and replace Mr-Glass home addition and ADU components across San Diego, with most jobs falling between $53,100 and $153,400 depending on the scope of the addition and what’s failed. Homeowners typically call us when a door binds against its frame, a seam opens up where the addition meets the original house, or a window stops sealing and morning condensate starts streaking the sill. You usually notice the problem in the morning, when sunlight hits the gap and makes it obvious.
We’re an independent general contractor in San Diego, not a Mr-Glass dealer, which means we’re free to recommend the part that actually fits your situation, not the one the factory wants to move this quarter. Trevor Nash has been running remodeling crews here long enough to know which Mr-Glass addition hardware holds up in coastal air and which ones corrode before the first repaint.
Which Mr-Glass Models This Applies To
Mr-Glass room additions and ADUs (accessory dwelling units) built in San Diego have a few shared systems that fail on a predictable schedule: the transition flashing where the new roofline ties into the existing house, the door thresholds that take direct sun from the west, and the window seals that fight the marine layer’s moisture every single night. If you have a Mr-Glass addition that’s 8 to 15 years old, you’re in the replacement window for all three.
To identify your part correctly, we check the label stenciled on the inside of the addition’s exterior door frame or the under-window tag on the original window sash. From there we match the series and size against Mr-Glass’s older runs versus what’s current. One compatibility gotcha we see often in San Diego: early Mr-Glass ADUs used a 5-1/4 inch jamb depth on the transition door, not the 4-9/16 inch that became standard later. If you buy a “universal” replacement threshold without knowing which one you have, you’re doing this job twice.
Our materials come from recognized trade brands like James Hardie for siding transitions and Therma-Tru for exterior doors, alongside quality aftermarket equivalents where they perform the same or better than the Mr-Glass original. We’ve also stocked and installed KraftMaid, Cambria, and Silestone materials on Mr-Glass interiors when the repair touches cabinets or countertops.
Styles & brands we work with
Signs Your Mr-Glass Home Additions & ADU Is Failing
- Doors that scrape or bind on one corner. Usually means the addition’s foundation has settled a quarter-inch or more. The slab or pier under the addition moves, the frame no longer sits square, and the door edge catches. In San Diego, it’s often the expansion and contraction of clay-heavy soil in the inland neighborhoods.
- A visible gap where the addition roofline meets the original roof. The metal flashing was never lapped correctly or fasteners backed out over years of thermal cycling. Water gets in, slow and quiet, and then one winter storm turns it into a ceiling stain.
- Foggy or streaky window glass in the addition. The double-pane seal has failed. Coastal humidity, especially in Point Loma, Pacific Beach, and La Jolla, works on window seals year-round. Once the inert gas escapes between the panes, you’re looking at window replacement.
- Soft spots in the addition’s exterior wall or floor near the base. This signals water intrusion, usually from a failed transition flashing or a threshold that stopped channeling water away from the building. By the time a nail set feels soft, the damage extends further than you can see from the surface.
- Drywall cracks that form a stair-step pattern at the addition’s interior corners. Classic differential settlement between the original house and the addition. You can caulk it, but it’ll reopen within a year if the underlying movement hasn’t stopped.
See the difference
Before
After
Before
After
Before
AfterReplacement Cost & What’s Included
For a Mr-Glass home addition or ADU repair in San Diego, expect $53,100 to $153,400 for full-scale replacements. Smaller scoped repairs, like a single transition door, threshold, and flashing rework, typically fall between $4,130 and $16,520. A focused window replacement for a failed seal runs $5,310 to $17,700 depending on the size and whether you go with impact-rated glass.
What drives the number up or down: whether the underlying framing is still sound or needs structural correction, the linear feet of flashing being replaced, the accessibility of the work area, and whether you’re matching existing trim or replacing it throughout. Every estimate includes parts, labor, the written guarantee, and a clean job site at the end of each day. We hand you a written price before any work starts, so the number on the first day is the number on the invoice.
Every job carries our 365-Day Done Right Promise. If it fails inside that year, we come back and make it right, no charge, no re-inspection fee. In writing, on every project.
DIY or Call Us?
You can check a few things safely before calling. Look for visible gaps where the addition roofline meets the house, run your hand along interior walls near the transition for moisture, and watch whether doors bind in wet weather versus dry weather. That gives us useful information before we arrive.
Where DIY goes wrong: anything involving the roof-to-wall flashing, the structural connection between the addition and main house, or door and window removal on an exterior wall. These are not drywall-anchor projects. If the work involves the building’s weather barrier, you risk making a small leak into a large one, or creating a code compliance issue you’ll have to undo before the project can be permitted. We also pull permits and handle inspections when the job requires it. Call us at (619) 604-9624 and we’ll talk it through. Tell me what you need, I’ll tell you what it costs, and we’ll go from there.
FAQs
Transition flashings typically last 10 to 15 years in San Diego, door thresholds 8 to 12 years depending on sun exposure, and window seals 12 to 20 years, with coastal homes on the shorter end due to constant moisture. If yours is failing earlier, the install or the part itself was likely the weak link. Call (619) 604-9624 and we’ll give you an honest read on what’s reasonable for your specific property.
Some can, some can’t. Door thresholds can occasionally be shimmed, and flashing can be resealed if caught early. Window seals, once failed, are replacement-only. Call (619) 604-9624 and we’ll tell you which side of the line your part falls on after a look.
A single door or window replacement is usually done in one day. Flashing rework or a threshold plus structural repair often runs two to three days, depending on what’s behind the wall. We give you a written schedule as part of the estimate. Call (619) 604-9624 for a realistic window for your job.
We keep common sizes for transitions, thresholds, and door hardware on our trucks, and we source the rest from recognized trade brands like Therma-Tru and James Hardie. If your Mr-Glass part is still under factory warranty, we’ll help you file the claim before we order anything. Call (619) 604-9624 and we’ll start the parts match today.
Written by Trevor Nash, Owner, Penhallow Remodeling San Diego at Penhallow Remodeling San Diego, serving San Diego and nearby areas.
