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Tamko Home Additions & ADU: The San Antonio Owner’s Guide
If you’re planning a home addition or ADU in San Antonio and want Tamko roofing products on it, plan for $45,000 to $130,000 for the full build, with Tamko shingles or metal panels typically running $8,000 to $20,000 of that total when the roof is done right. Mason Remodeling Co San Antonio installs Tamko roofing systems on additions and ADUs across the city, and we can usually get your project scoped and priced within a week of the first walkthrough. Most San Antonio homeowners reach out to us after a previous contractor quoted the addition but left the roof as a vague line item, and they want to know exactly what’s going over their heads before they commit to a six-figure project.
What we hear most often from homeowners in Alamo Heights, Stone Oak, and the neighborhoods around Lackland: they want the addition framed and dried in without surprises, and they want the roofer and the framing crew to actually talk to each other. That coordination is where Tamko additions go wrong when they’re handled as two separate jobs.
Key takeaways:
- Tamko roof installation on a San Antonio addition or ADU runs $8,000 – $20,000 depending on square footage, pitch, and product line
- Full addition or ADU build: $45,000 – $130,000 (ADUs specifically can reach $90,000 – $220,000 for a detached unit)
- We stock and install Tamko Heritage, Elite Glass-Seal, and MetalWorks lines for residential additions
- Written price before any work starts, every time
Which Tamko Models This Applies To
For San Antonio additions and ADUs, the Tamko products we install most are the Heritage shingle line (the standard architectural shingle), the Elite Glass-Seal series (Tamko’s upgraded algae-resistant line, which matters here because San Antonio’s humidity feeds roof algae), and MetalWorks steel shingle panels for homeowners who want a metal profile without a standing-seam look. If your addition has a low-slope section, we also work with Tamko’s self-adhering underlayments and modified bitumen systems, because San Antonio’s occasional ice storms and frequent intense sun put real stress on low-slope transitions.
Here’s the gotcha most homeowners don’t know: Tamko’s algae-resistant warranty language differs by product line, and not every Tamko shingle qualifies for the same algae warranty in Texas. The Heritage line carries a 10-year algae warranty; the Elite Glass-Seal extends that to 15 years. If a contractor quotes you “Tamko shingles” without specifying the line, you don’t actually know what warranty you’re buying. That’s a conversation we have at the quote stage, not after the roof is on. We are an independent San Antonio remodeler, not a Tamko dealer, so our job is to match the right Tamko product to your addition’s pitch, exposure, and budget, not to push a specific SKU.
Styles & brands we work with
Signs Your Tamko Home Addition or ADU Roof Is Failing
- Granule loss in gutters and at downspout elbows. San Antonio’s heat cycles bake asphalt shingles, and granule loss accelerates once the shingle hits year 12 – 15. If you’re seeing granules pile up after a rain, the shingle surface is degrading faster than the underlying mat.
- Curling at edges, especially on west-facing slopes. The afternoon sun in San Antonio is brutal on west-facing roof planes. Curling starts at the corners and edges, where heat builds and the adhesive strip lets go.
- Dark streaks that don’t wash off with a hose. That’s usually gloeocapsa magma, the algae strain that feeds on limestone filler in shingles. It’s cosmetic at first, but it retains moisture and shortens shingle life if left untreated for years.
- Water staining on the ceiling directly below a valley or addition tie-in. The transition where the new roof meets the old house is the most common leak point on San Antonio additions. We see this regularly in older homes near Woodlawn Lake and Monte Vista where the original roof is 20-plus years old.
- Lifted shingles or exposed fasteners around the ridge vent after storms. San Antonio thunderstorms produce microbursts that peel shingles at the ridge line. If nails or staples are visible at the ridge, water’s already getting under the shingle course.
Replacement Cost & What’s Included
For a Tamko roof on a San Antonio addition or ADU, you’re looking at $8,000 to $20,000 installed, depending on roof complexity, pitch, and product line. A simple 400-square-foot ADU roof with Heritage shingles lands toward the lower end. A 1,200-square-foot addition with multiple valleys, a steep pitch, and Elite Glass-Seal shingles lands near the top. MetalWorks panels run higher, typically $15,000 to $40,000 for a full addition roof.
What drives cost in San Antonio specifically: tear-off and haul-off of old material if you’re re-roofing an existing addition, the pitch (anything over 6/12 slows the crew and raises labor), and valley count. Every valley adds flashing work. Our written quote includes tear-off, deck inspection, underlayment, ice-and-water shield at eaves and valleys, all Tamko starter and ridge caps, flashing, permit coordination, and a written guarantee covering our workmanship for 365 days from completion. You get the number before we start, and it doesn’t move unless you change the scope.
See the difference
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AfterDIY or Call Us?
A homeowner can safely do two things: inspect from the ground with binoculars after storms, and keep gutters clear so water drains instead of backing up under the shingle edge. That’s where DIY should end. Walking a roof to inspect shingles, replacing individual shingles, or re-flashing a valley means working at height on a surface that’s either slick after rain or hot enough to soften shingles in the San Antonio summer. Falls from roofs are the leading cause of fatal home improvement injuries in Texas, and a single misplaced nail through a shingle can void the manufacturer’s material warranty. If you suspect your addition roof is failing, call us at (254) 269-5071. We’ll put eyes on it and tell you exactly what you’re looking at, whether it’s a simple repair or a full replacement.
FAQs
You should get 20 to 30 years from a properly installed Tamko architectural shingle in San Antonio, with the caveat that west-facing slopes and additions with poor attic ventilation tend to run closer to the 20-year mark due to heat buildup. Call (254) 269-5071 and we’ll assess your specific roof’s condition and remaining lifespan.
Yes, if the damage is isolated to a few shingles, a single valley, or one flashing point, a repair is often the right call and will run $400 to $1,800 in San Antonio depending on what’s involved. If the roof is past 15 years old with widespread granule loss and curling, repairs become a band-aid that costs more per year than replacing.
A typical San Antonio addition roof replacement takes 2 to 4 days from tear-off to final inspection, depending on size, pitch, and weather. We’ll give you a firm schedule in the written quote so you know exactly when the crew arrives and when they’re done.
We keep Tamko underlayments, ventilation, and common flashing materials in stock, and order shingles per job so you’re not paying for material sitting in a warehouse. That means color and line selection are broad, not limited to what’s gathering dust. Call (254) 269-5071 for a free estimate and we’ll price your exact roof.
Call Mason Remodeling Co San Antonio for Your Tamko Addition Roof
If you’re building an addition or ADU in San Antonio and want the roof done right, call us at (254) 269-5071. We’ll walk your project, measure the roof, and hand you a written price before any work starts. Isaac Pruett runs the crew personally, and he’s the one who scopes your job. Know who’s coming, know what it costs, know it’s covered. That’s the whole job before the job starts.
Written by Isaac Pruett, Owner, Mason Remodeling Co San Antonio at Mason Remodeling Co San Antonio, serving San Antonio and nearby areas.
