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CGI Home Additions & ADU: The San Antonio Owner’s Guide
CGI home additions and ADU construction in San Antonio typically runs $45,000–$130,000 for a standard addition and $90,000–$220,000 for a detached accessory dwelling unit. We install and service CGI-compatible structural components including framing systems, window packages, and exterior door assemblies that owners across San Antonio rely on for their additions and ADUs. Most homeowners discover a problem the same way: a door starts binding after a hot, dry summer, a window loses its thermal seal, or the addition’s roofline shows water staining after one of our spring downpours. When that happens, you need a crew that knows CGI products, not a generalist guessing at the problem.
Mason Remodeling Co San Antonio is an independent service provider, not affiliated with CGI. We work with CGI components because they hold up in our climate when installed correctly, and we keep a working inventory of the CGI parts that fail most often here.
Which CGI Models This Applies To
CGI manufactures window and door systems used in residential additions and ADUs across Texas. We regularly service CGI’s impact-rated and standard lines, including the Classic, Estate, and Custom series window packages along with SGD and entrance door assemblies. The critical thing to understand about CGI products is that frame depth and glass package vary by series, and a part ordered for one series will not always seat correctly in another. A Classic series sash with laminated glass has a different profile than an Estate series sash, even when both measure 36 by 48 inches.
To identify what you have, look for the CGI label etched into the glass corner or the frame’s interior channel. It lists the series, the glass package code, and the manufacturing date. If that label is gone, measure the visible glass area and the frame depth to the nearest sixteenth of an inch, then call us. We’ll match it. For CGI windows in San Antonio, we recommend OEM glass packages rather than aftermarket equivalents because the laminated and insulated glass units are engineered to meet both impact resistance and energy codes that generic replacement glass often misses.
Styles & brands we work with
Signs Your CGI Home Additions & ADU Is Failing
- Condensation between the glass panes. The thermal seal has failed. San Antonio’s summer heat and humidity cycles cause seal failure in CGI insulated units faster than in milder climates, usually between 10 and 15 years.
- Water staining on interior drywall below or beside a window. The flashing or frame seal has separated. We see this most often on south-facing walls, where our afternoon sun heats the frame and breaks down sealant.
- Doors that drag, stick, or won’t latch after a foundation shift. San Antonio’s expansive clay soil moves every structure. When an addition shifts, the CGI door frame twists with it, and the door binds.
- Cracked or cloudy laminated glass in an impact window. The outer lite may still be intact, but the laminate layer has been compromised. It won’t perform in a storm, and it will not pass inspection if you’re selling the home.
- Window sashes that won’t stay open or fully close. The balance system or hinge hardware has worn out. CGI balances are specific to each series and sash weight, so a generic replacement spring won’t hold properly.
Replacement Cost & What’s Included
For a single CGI window or door component replacement within a larger addition, expect $2,000–$6,500 for countertop-adjacent work along the window wall, $4,500–$15,000 if multiple windows need replacement, and $45,000–$130,000 for a full home addition in San Antonio. ADU construction runs $90,000–$220,000 depending on size, finishes, and whether you’re building detached or converting a garage. Our written price covers the CGI part, labor, trim work, disposal of the old component, and any permit fees required by the City of San Antonio. We deliver that price before any work starts, in writing, as standard. No verbal estimate that grows on the final bill.
We match the scope of work to the exact CGI series and glass package you have, not a “close enough” substitute. Isaac Pruett, owner of Mason Remodeling Co San Antonio, learned early in his two decades of construction across the Southwest that getting the spec right the first time means fewer callbacks. That’s why every CGI replacement we do starts with a field verification of series, size, and glass package before we order anything.
See the difference
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AfterDIY or Call Us?
You can check a few things safely on your own: look for the etched CGI label to identify your series, check whether the condensation is between the panes or just on the surface, and note whether a door binds at the top, bottom, or strike side. These details help us quote accurately over the phone.
What you should not do is remove a CGI sash or door panel yourself. These units are heavy, the frame clips are under tension, and dropping an impact-rated glass package is a real risk. The tempered and laminated glass in CGI products weighs significantly more than standard glass, and a broken unit is expensive to replace. Call (254) 269-5071 and we’ll send a technician who has handled these exact units. Every crew member is background-checked, identity-verified, and arrives in a clean marked uniform with a photo ID badge. You’ll know their name and see their photo before they reach your door.
FAQs
CGI window and door assemblies typically last 15–25 years in San Antonio, with sealed glass units often needing replacement at the 10–15 year mark due to our heat and humidity cycles. Frames and hardware usually outlast the glass packages. Call (254) 269-5071 for a free inspection to see where your components stand.
Yes, if the failure is isolated to a balance, hinge, latch, or weatherstripping. If the insulated glass unit has lost its seal, the glass package itself must be replaced. We stock common CGI hardware on our trucks and can order exact glass packages matched to your series.
Most single-unit CGI replacements in San Antonio take one day once the correct part arrives. Custom glass packages that require factory ordering can take two to three weeks. We give you a written timeline with your written price.
We keep the most commonly needed CGI hardware on hand: balances, latches, hinges, weatherstripping, and screen assemblies. Glass packages are ordered to match your exact series and measurements, which we verify before ordering so we don’t install the wrong unit. Our suppliers include KraftMaid for cabinetry, plus Cambria and Silestone for surfaces, so we can often handle related work on the same visit.
What Our 365-Day Done Right Promise Means for CGI Work
Know who’s coming, know what it costs, know it’s covered, that’s the whole job before the job starts. Every CGI window or door replacement we install in San Antonio is covered in writing for 365 days from the completion date. If the work isn’t right within that year, we come back and make it right at no cost to you. No charge, no dispute process, no conditions. We’ve been doing this since 2004 as part of the Threshold Group family of home-service companies, and the Threshold Standard applies to every visit: verified technician, photo ID, written price, written guarantee.
Contact Mason Remodeling Co San Antonio
If you have a CGI window, door, or addition component that’s failing in San Antonio, call us at (254) 269-5071 for a free estimate. A live person answers every call, 24 hours a day, every day of the year including weekends and holidays. No call trees, no voicemail loops. We’ll set up a time to inspect your CGI components, verify the series and measurements, and deliver a written price before any work begins.
Written by Isaac Pruett, Owner, Mason Remodeling Co San Antonio at Mason Remodeling Co San Antonio, serving San Antonio and nearby areas.
