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Cover Home Additions & ADU: The San Antonio Owner’s Guide
Home additions and ADUs in San Antonio run from $45,000 to $130,000 for the full project, with ADU construction ranging from $90,000 to $220,000 depending on square footage, foundation work, and utility runs. When a Cover owner calls us about a failed or failing addition, what they are usually describing is not the whole project gone wrong: it is a specific component that has stopped performing the way it should, whether that is a poorly flashed roofline connection, a slab edge that has begun to separate, or a manufactured wall panel that has shifted out of square. We walk every Caller through what they are seeing, match it to the right fix, and give them a written price before a single tool comes off the truck.
The symptom picture we hear most often: a corner of the addition that feels different underfoot, a door that no longer latches the way it did in the first year, or a drywall crack that has reappeared after being patched once already. In San Antonio’s clay-heavy soils, especially in neighborhoods like Alamo Heights, Terrell Hills, and older pockets near Monte Vista, foundation movement is rarely a design flaw and almost always a soil-and-moisture issue. The Part that fails first is usually the connection point: where the new work meets the original structure, or where the addition’s slab edge meets the native soil.
Key Takeaways
- Home additions in San Antonio typically run $45,000 to $130,000; ADUs run $90,000 to $220,000.
- Most Cover-related failures we see are at connection points: slab edges, roof tie-ins, and wall-to-wall transitions.
- San Antonio’s expansive clay means seasonal movement is expected; the right detail work prevents it from becoming structural damage.
- We give a written price before work starts, and every job is backed by the 365-Day Done Right Promise.
- Graham Stein leads the job personally; he writes every scope of work down before a single tool leaves the truck.
Which Cover Models This Applies To
We work on Cover home additions and ADU structures as an independent contractor in San Antonio. We are not affiliated with Cover, which matters only in one way: when a manufactured component fails, we match it by the label, the measurement, and the install date, not by a catalog guess.
The first step is identifying what you actually have. Cover additions are typically panelized or volumetric, meaning wall sections or modules arrive pre-built and are set onto a prepared slab or pier foundation. The connection details are where compatibility questions live. If your structure has a sticker or plate with a series number, snap a photo of it. If it is a panelized build, the panel layout diagram from your original plans tells us the module sequence, which matters when one panel has shifted and needs to be reset. What fails first on a Cover structure in Texas is rarely the panel itself. It is the flashing at the roof-to-wall intersection, the weather barrier at the sill, or the anchor points where the module meets the foundation. Those are the pieces we stock on the truck for San Antonio jobs, because on any given week, at least one of them is letting water or air into a home.
The OEM versus aftermarket decision for Cover components is straightforward: when the original hardware is available and in spec, we use it. When it is not, we use aftermarket equivalents that meet or exceed the original load rating, and we write that substitution into the line-item price so you see it before you sign anything. For flashing, sealants, and sill gaskets, we specify products rated for South Texas sun exposure, because a sealant rated for a mild coastal climate will crack open within two San Antonio summers.
Styles & brands we work with
Signs Your Cover Home Additions & ADU Is Failing
- Doors that will not latch without lifting or pushing. This is the classic first sign of slab edge settlement. In San Antonio’s clay soil, a slab edge that has dropped half an inch will throw an entire door frame out of square. The fix is usually helical piers or a slab edge lift, not a new door.
- Drywall cracks that return in the same place after one patch. A crack that reappears at a wall-to-ceiling transition or where the addition meets the original house is telling you there is ongoing movement. The cosmetic patch hides the symptom; it never addresses the connection point behind the drywall.
- Small gaps opening where the addition wall meets the original stucco or siding. If you can see a dark hairline at that seam, water and air are getting in. We see this frequently on Cover panelized additions, and the fix is a properly flashed and sealed transition joint, done from the outside in.
- Musty smell in one corner that never fully dries out. That is water intrusion at a sill or an improperly lapped weather barrier. San Antonio’s summer thunderstorms put constant pressure on those joints. The smell is the problem making itself known before the framing damage gets expensive.
- Floor tile or LVP that is cracking or lifting along one wall only. A slab that is moving independently along one edge pressing upward will crack rigid flooring in a straight line. That line usually runs parallel to the slab edge, and it tells us exactly where the soil pressure is coming from.
Replacement Cost & What’s Included
Home additions in San Antonio run $45,000 to $130,000 for a full build, and ADU construction runs $90,000 to $220,000. But when we are talking about repairing a failed component rather than building from scratch, the numbers look different. A slab edge repair with helical piers at one or two points typically falls in the $8,000 to $25,000 range depending on pier depth and access. A failed roof-to-wall flashing repair runs $1,500 to $5,000. A full weather barrier replacement at the sill where a Cover module meets the slab is usually $3,000 to $9,000, depending on how much siding and framing has to come apart to do it right.
| Repair Type | Typical San Antonio Price Range |
|---|---|
| Slab edge lift with helical piers (1 – 2 points) | $8,000 – $25,000 |
| Roof-to-wall flashing replacement | $1,500 – $5,000 |
| Sill weather barrier reset (one wall) | $3,000 – $9,000 |
| Full addition build | $45,000 – $130,000 |
| ADU construction | $90,000 – $220,000 |
Every quote we give in San Antonio includes the parts, the labor, the permits when the repair requires them, and the clean-up. We lay drop cloths on the floors, wear shoe covers at the door, and photograph the clean-up before the crew leaves so you can see what we left behind. The written price you get before any work starts is the price you pay, even if the job turns out harder than the initial walkthrough suggested. That is the Cedarwell Care Promise, and it is a written promise, not a handshake.
Graham Stein signs every scope of work personally. He writes every line item down before a single tool leaves the truck. Write it down, price it once, do it right.
See the difference
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AfterDIY or Call Us?
Some things on a Cover addition are safe to check yourself. You can watch for new cracks, test doors and windows throughout the year to see if latching is getting harder, and keep gutters clear so water is not dumping against the sill. Those are homeowner-level observations, and they help us get to the right diagnosis faster.
What you should not do yourself is anything involving structural anchoring, slab lifting, or flashing at the roof line. A slab that is moving under hydraulic pressure can shift suddenly. A ladder against stucco at the roof-to-wall intersection in a San Antonio summer, with the wind coming up in the afternoon, is not where any homeowner should be. The tools and materials for correct flashing and weather barrier work are not things most garages hold, and a wrong guess at the sealant will fail within two seasons. If the door will not latch or the crack has returned, call (432) 233-0976 and we will walk the site with you. The estimate is free, and the walkthrough will tell you what is actually wrong, not what we hope to sell you.
FAQs
A properly built Cover structure in San Antonio should last 30 to 50 years on the framing and structural side, but the connection details like flashing, sealants, and weather barriers will need attention every 8 to 12 years because South Texas heat and UV break down those materials faster than the framing. If it is built in San Antonio clay without site-specific slab preparation, you may see cosmetic and structural movement signals within the first five years. Call (432) 233-0976 and we will tell you what your structure is actually doing, not what the average is.
Most failing Cover additions can be repaired at the connection points without rebuilding the structure. The panel itself is rarely the problem; it is almost always the slab edge, the flashing, or the sill barrier, and those are repairable. If the framing behind the drywall or siding has been wet long enough to rot, that section gets replaced while the rest of the structure stays. Call (432) 233-0976 for an exact diagnosis and a written price.
A slab edge lift with helical piers usually takes two to four working days on site, and a flashing or weather barrier repair usually takes one to three days depending on how much siding has to come off. We walk the schedule with you before we start, and we work around nap hours and school pickup when we can. Call (432) 233-0976 and we will give you a specific timeline for your specific repair.
We stock the parts that fail most often on Cover structures in San Antonio: sill gaskets, flashing profiles, sealants rated for South Texas UV, and anchor hardware at common load ratings. If your job needs a part we do not stock, we order it and show you the line item on the written price before the work begins. Call (432) 233-0976 for a free estimate, and we will confirm we have what your job needs.
Ready to Get Your Cover Addition Fixed Right?
If you are seeing cracks, doors that will not close, or a corner that no longer feels right, we can walk you through what is happening and what it will cost to fix. We work in San Antonio every day, and we have seen these failures enough times to know what to look for the first time out, so you are not paying for guesses. Call (432) 233-0976 to schedule your free estimate. We will give you a written price before any work starts, and when the job is done, the 365-Day Done Right Promise stands behind every repair we make.
Written by Graham Stein, Owner, Elmstead Remodeling San Antonio at Elmstead Remodeling San Antonio, serving San Antonio and nearby areas.
