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CWS Home Additions & ADU: The San Antonio Owner’s Guide
A CWS home addition or ADU in San Antonio typically runs $45,000 – $130,000 installed, depending on square footage, foundation work, and whether you’re adding a ground-up structure or converting existing space. If you’re reading this, you probably already own a CWS system or product and something’s not performing the way it should, whether that’s a failed component, a structural connection, or a build-out that was never finished correctly. Most homeowners call us after noticing visible separation at joints, doors that suddenly won’t close square, or moisture intrusion where an addition meets the main structure.
We stock and install CWS-compatible components across San Antonio, and we price every repair or replacement in writing before work begins. Nobody shows up at your door without a name, a photo, and a written number.
Which CWS Models This Applies To
CWS home additions and ADU systems vary by series and build year, and the compatibility gotcha most owners miss is this: older CWS wall panel systems use a 2×4 framing channel with proprietary corner connectors, while newer CWS ADU kits moved to a 2×6 channel that changes your insulation depth, your drywall reveal, and your trim sizing. You can’t mix the two. If your addition was built before roughly 2018, assume you’re working with the narrower channel until someone measures it.
How to identify what you have: look for the stamped label on the interior side of any exposed panel or header, usually near a window rough opening. The label gives you the series code and the manufacturing date. If the label’s gone or painted over, measure the exposed wall cavity at an outlet box. A 3.5-inch cavity means 2×4 framing channels; a 5.5-inch cavity means 2×6.
For CWS specifically, we recommend OEM connectors and track whenever you’re replacing anything load-bearing. Aftermarket equivalents exist and they’re cheaper, but the tolerance differences in CWS’s corner gussets and base track are tight enough that a generic part can introduce racking over time. For non-structural trim, flashing, and interior finish components, quality aftermarket parts are fine and often arrive faster. We also stock compatible components for KraftMaid cabinetry, and Cambria and Silestone surfaces when a CWS addition involves kitchen or bath build-out work.
One note for clarity: Mason Remodeling Co San Antonio is an independent service provider. We’re not affiliated with CWS. We just see their systems often enough across San Antonio to know exactly what fails and what fits.
Styles & brands we work with
Signs Your CWS Home Additions & ADU Is Failing
- Doors that stick or won’t latch at the top or bottom edge. In a CWS addition, this almost always traces back to foundation movement or a settling corner post. San Antonio’s clay-heavy soil expands and contracts hard with rain and drought cycles, and a door that changes behavior seasonally is your first signal the structure is moving more than it should.
- Visible gap between the addition and the main house at the roofline or wall intersection. This is the most common failure point on CWS additions. The flashing fails, water gets in, and the joint opens up. If you can see daylight or feel a draft at the seam, the connection detail needs attention before rot sets in.
- Cracks radiating from window corners. CWS window rough openings are reinforced at the corners, but the drywall around them isn’t. Diagonal cracking here means the header or the corner connector is under stress, not just a bad tape job.
- Floor bounce or a soft spot near exterior walls. In San Antonio, the culprit is usually moisture wicking up through an improperly sealed base track. The track corrodes, the rim board softens, and the floor loses its bearing. You’ll feel it before you see it.
- Musty smell in the ADU after rain. That’s moisture getting behind the wall system through a failed penetration seal, usually around exterior outlets or hose bibs. CWS panels are tight when sealed correctly, but once water finds a path, it stays inside the cavity and feeds mold.
See the difference
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After
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AfterReplacement Cost & What’s Included
For San Antonio, here’s what we quote on CWS home addition and ADU work:
- Full home addition: $45,000 – $130,000
- ADU construction (ground-up): $90,000 – $220,000
- Garage conversion to living space: $30,000 – $80,000
- Structural repair to an existing CWS addition (corner post or base track replacement, header work): generally 15 – 30% of the original build cost
What drives the top of that range: foundation requirements in San Antonio’s expansive clay, electrical service upgrades, permitting and inspection fees, and the condition of whatever the addition is attaching to. Every quote includes parts, labor, debris removal, and a written line-item breakdown before you sign anything. We pull permits, we schedule inspections, and we don’t change the number once work starts. The workmanship is covered for 365 days from completion under our Done Right Promise.
DIY or Call Us?
There are a few things a homeowner can check safely: whether the roof seam flashing is visibly lifted, whether downspouts are dumping water against the addition’s foundation, and whether the base track shows rust or scaling at grade. Those inspections tell you what’s happening.
Fixing it is different. Replacing a CWS corner connector, pulling and resetting a base track, or re-flashing a roof-to-wall intersection all involve load-bearing components and, often, working at height. Getting the load path wrong on an addition means the structure carries weight it wasn’t designed for, and that shows up later as a cracked slab or a wall that leans. This is one of those times where a trained crew and a written guarantee are worth more than what you’d save doing it yourself. If you’re anywhere in San Antonio, call us at (254) 269-5071 and we’ll send someone who can tell you exactly what you’re looking at, whether or not you hire us to fix it.
FAQs
A properly installed CWS addition in San Antonio should last 40 – 60 years before major structural work, assuming the foundation was engineered for local soil conditions and the flashing is maintained. What shortens that lifespan here is water management: San Antonio’s heavy spring rains and long dry summers create repeated expansion-contraction cycles at every seam. Keep water away from the foundation and the building envelope stays sound.
It depends on what’s failing. Flashing, trim, and non-structural connectors can usually be repaired or replaced piecemeal for a few hundred to a few thousand dollars. A corroded base track or a compromised corner post typically needs full replacement because the failure affects load transfer. We’ll tell you which one you have before we quote anything, and the estimate is free. Call (254) 269-5071.
Most structural component replacements on a CWS addition take 2 – 5 working days, including inspections. A full ADU build runs 4 – 8 months depending on permitting and weather. We give you a written timeline with your written price, and we tell you up front which parts of the schedule are in our control and which parts belong to the city.
We stock common CWS-compatible flashing, base track segments, fasteners, and trim on our trucks for service calls. Series-specific connectors and corner gussets are ordered per job, usually arriving in 3 – 7 business days. We confirm part availability before we schedule the work, so you’re not paying crew time while we wait on a delivery.
Written by Isaac Pruett, Owner, Mason Remodeling Co San Antonio at Mason Remodeling Co San Antonio, serving San Antonio and nearby areas.
