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Cover Home Additions & ADU: The San Antonio Owner’s Guide
We install complete Cover-compatible home additions and ADU builds across San Antonio, with most projects landing between $45,000 and $130,000 depending on square footage, site access, and foundation requirements. If you’re reading this, you’ve likely hit the wall every homeowner hits: the addition was sketched, maybe even permitted, but the framing, the tie-in, the roof line, the mechanical runs – something’s not meshing with your existing Cover structure the way it should. Most owners discover the problem when they see the first concrete quote and realize the “simple bump-out” is a load-bearing puzzle nobody wants to solve correctly.
Which Cover Models This Applies To
Cover homes are built on a specific structural logic, and that logic drives what a compatible addition requires. The critical gotcha: Cover’s roof pitch and eave height differ from standard San Antonio tract framing, so a one-size-fits-all addition truss will not tie in cleanly. We measure from the existing Cover ridge line down to the fascia board before we ever order lumber. If the addition’s roofline doesn’t match within an inch, you get water intrusion at the transition, which in San Antonio’s monsoon-season downpours means ceiling damage you won’t notice until the first August storm. For the OEM-versus-aftermarket decision: Cover doesn’t sell “addition kits,” so every framing member, tie bracket, and flashing detail is fabricated to match the existing structure. We spec engineered lumber and weld plates from local San Antonio suppliers rather than big-box off-the-shelf pieces, because the mid-wall tie-in point on a Cover home carries more lateral load than a typical gable. We also stock compatibility hardware for KraftMaid cabinetry, Cambria surfaces, and Silestone counters for when your addition includes a kitchenette or in-law suite.
Styles & brands we work with
Signs Your Cover Home Additions & ADU Is Failing
- Gap opening at the roofline transition. The new roof framing settles differently than the original Cover roofline, and a visible seam appears where the two meet. This is the first sign the tie-in wasn’t engineered for differential settling, common in San Antonio’s expanding clay soil.
- Sticking doors or window frames along the addition wall. In Alamo Heights and Terrell Hills especially, the soil’s shrink-swell cycle moves the new foundation at a different rate than the original slab. When the addition’s door frames become difficult to open within a year, the foundation header wasn’t tied correctly.
- Drywall cracking at the neutral plane. Where the new addition meets the old house, you can usually see hairline cracks radiating from above windows. The issue is typically a missing or undersized steel strap at the top plate connection.
- Water staining near the addition’s exterior base. If you see discoloration along the bottom plate of the new walls after a hard rain, the flashing at the roof-to-wall transition is failing, which is a common Cover-specific problem when the eave height isn’t matched to within a half-inch.
- HVAC temperature imbalance in the new space. When an addition is built without resizing the existing air handler, you get a 10 to 15 degree difference between the new room and the rest of the house. In San Antonio summers, that addition becomes unusable by July.
See the difference
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After
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AfterReplacement Cost & What’s Included
In San Antonio, a Cover-compatible home addition runs $45,000 to $130,000 installed. The spread comes from three factors: square footage (a 300-square-foot bump-out costs far less than a 900-square-foot primary suite), site access (narrow lots in King William or Lavaca add labor hours for material handling), and foundation type (pier-and-beam additions cost less than post-tension slab work). Your written quote includes all framing lumber, engineered tie-in hardware, roofing and flashing at the transition, electrical rough-in, insulation, drywall, and paint-grade trim. We do not run a verbal estimate and then revise it upward once the permit is pulled – the price you sign is the price you pay, line by line. Isaac Pruett and our crew have been framing addition tie-ins on San Antonio homes for years, and we’re able to identify the structural quirks of Cover homes before we send a labor quote, which means fewer surprises on the invoice and fewer callbacks after the job is done.
DIY or Call Us?
What you can safely check before calling: look at the roofline where the addition meets your original Cover roof and measure the gap with a tape measure. If you see daylight through the seam, call us – that’s a structural and water-intrusion problem that gets worse with every rain. You can also check the addition’s exterior walls for any tilt by setting a level against the bottom plate. What you should not attempt: cutting into the existing roofline, removing any wall section on the original structure, or pouring a new foundation without a San Antonio structural engineer’s stamp. A house’s gravity and lateral load paths are not a weekend project, and a Cover home’s shear wall design isn’t forgiving if you remove the wrong section. Call (254) 269-5071 and we’ll send someone who can tell you exactly what’s wrong and what it costs to fix.
FAQs
A properly tied-in addition should last as long as the original structure, but the most common failure point is the roofline transition, which typically lasts 8 to 15 years before flashing needs replacement in San Antonio’s UV-heavy climate. We warranty our addition work for 365 days from the completion date, covering the framing tie-in, flashing, and interior finishes.
In about 70% of cases, yes – if the framing members are intact and the issue is flashing failure, settling gaps, or an undersized window header, we can repair the specific connection points without tearing out the entire addition. If the foundation under the addition has shifted more than an inch and a half, that’s usually a rebuild scenario. Call (254) 269-5071 for an exact quote – estimates are free.
A standard 400-square-foot addition takes 6 to 10 weeks from permit approval to final coat of paint in San Antonio, depending on the foundation inspection schedule and weather windows, with larger additions running 10 to 16 weeks. We don’t offer a 30-day build because we don’t cut corners on foundation curing time – that’s a structural problem waiting to happen. Call (254) 269-5071 for a timeline estimate specific to your project.
Yes, we keep a standard run of weld plates, hurricane straps, and engineered lumber connectors on hand in our San Antonio shop, which means we’re not waiting on suppliers when the framing crew is already on site. The specific steel gauge and fastener pattern is matched to your existing Cover structure during our first measurement visit. Call (254) 269-5071 to schedule a measurement, and we’ll identify the exact hardware your addition needs before any money changes hands.
Know who’s coming, know what it costs, know it’s covered – that’s the whole job before the job starts. Mason Remodeling Co San Antonio is an independent service provider, not affiliated with Cover, and we’ve been doing additions and ADU work across San Antonio since 2004 as part of the Threshold Group family. Every technician who steps onto your property is background-checked, identity-verified, and arrives in a clean marked uniform with a photo ID badge at the door – you’ll know the name and face before the visit. We deliver a written price before any work starts, and every completed project is covered by a written 365-day guarantee. Call (254) 269-5071 for your free estimate, and we’ll have a live person on the line within seconds.
Written by Isaac Pruett, Owner, Mason Remodeling Co San Antonio at Mason Remodeling Co San Antonio, serving San Antonio and nearby areas.
