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ES Windows Home Additions & ADU: The San Antonio Owner’s Guide
If you’re planning a home addition or ADU in San Antonio and want ES Windows glazing on the project, a full addition typically runs $45,000 – $130,000 installed, while a detached ADU lands between $90,000 – $220,000 depending on size, foundation work, and finish level. We work with ES Windows products on additions and ADUs across San Antonio, and we quote the window package as a named line item in your written price before any work starts. Most homeowners reach out when they realize a builder-grade window package won’t hold up to Texas sun, or when an existing ES Windows unit on an older addition has failed and they’re weighing replacement versus a fuller renovation.
We’re an independent remodeling contractor serving San Antonio, not affiliated with ES Windows, and we carry or order ES Windows-compatible parts for the addition and ADU work we take on. That means you get one crew accountable for framing, flashing, glass, and trim, with a written price that already includes the named materials.
Key Takeaways
- Home additions in San Antonio with ES Windows glazing typically cost $45,000 – $130,000; ADUs run $90,000 – $220,000.
- We write the ES Windows product name, model, and finish into your scope of work before demo day.
- Every project carries the 365-Day Done Right Promise: if it’s not done right, we make it right.
- Drop cloths, shoe covers, and a photo of the clean-up are standard on every job, every day.
Which ES Windows Models This Applies To
ES Windows produces both fixed and operable aluminum and vinyl frames, but the spec that matters on a San Antonio addition or ADU is the glass package and the frame series. We routinely install ES Windows single-hung, casement, horizontal slider, and picture windows, plus multi-panel sliding doors, on additions across neighborhoods like Terrell Hills, Alamo Heights, and Stone Oak. The compatibility gotcha: ES Windows builds to order with specific frame depths and nailing fin profiles, so a window bought for one rough opening rarely drops cleanly into another without reframing or shim work. If you’re replacing a failed unit, measure the visible glass width and height, then check the frame depth with the sash open. We match the series off the label etched in the corner of the glass or the sticker on the head jamb.
For San Antonio heat, we steer addition and ADU clients toward ES Windows low-E insulated glass with a warm-edge spacer. The Texas sun through single-pane or builder glass is the number-one reason older sunroom and addition windows fail early here. On OEM versus aftermarket: ES Windows parts like balances, rollers, and weatherstripping are available through distribution, but we’ve had better long-term results matching OEM hardware rather than generic aftermarket clips and cams on this brand. The aftermarket parts sometimes fit, but they don’t seat the same way, and two summers of San Antonio expansion and contraction will show you the difference.
Styles & brands we work with
Signs Your ES Windows Home Additions & ADU Is Failing
- Condensation trapped between the glass panes. The seal on the insulated glass unit has failed. In San Antonio’s humidity cycles, this shows up first on west- and south-facing windows that take direct sun all afternoon.
- The sash sticks, drags, or drops when you let go. Worn balance springs or shoe clips. On older ES Windows units, the plastic shoe was the common early failure point, and the window gets heavy quickly.
- You can feel air moving around a closed window. Weatherstripping has compressed or the frame has shifted slightly out of square, often after a foundation settling cycle or a hard thunderstorm season.
- Water staining on drywall below the window or on the sill. The flashing detail at the rough opening is failing, or the weep system in the track is clogged. We see this on San Antonio additions where the original installer skipped a sill pan.
- The window is hard to lock, or the lock only catches on one side. The interlock at the meeting rail is out of alignment, usually because the installation left the frame racked slightly.
See the difference
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After
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After
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AfterReplacement Cost & What’s Included
A full home addition in San Antonio with ES Windows glazing runs $45,000 – $130,000, and an ADU runs $90,000 – $220,000. If you’re replacing a handful of failed ES Windows units on an existing addition or sunroom, window replacement on its own runs $4,500 – $15,000 depending on how many openings, the glass package, and the frame series. What moves the number: the size of the addition, whether it’s on a slab or crawlspace, the finish level inside, and how many windows and doors the design calls for. On the window side specifically, the cost driver is the glass package. Low-E insulated units with argon and a warm-edge spacer cost more than clear glass, and San Antonio’s cooling season makes that upgrade worth it every time.
Every quote we write lists the ES Windows product by name, the quantity, and the labor to flash and trim it correctly. You sign one number. That’s the number you pay. The work carries the 365-Day Done Right Promise, so if a window installation isn’t right after the job is complete, we make it right. That’s Graham Stein’s rule on every project: write it down, price it once, do it right.
DIY or Call Us?
Removing and reinstalling ES Windows on an addition or ADU is not a weekend DIY project. The units are heavy, the flashing details at the rough opening are what keep San Antonio’s driving afternoon rains out of your wall, and a dropped frame can cost you far more than the labor you saved. What an owner can safely do: check the weep holes at the bottom of the track and clear them with a soft brush, wipe the weatherstripping with a silicone-safe cleaner, and note which unit is failing and when. Direct glazing, reflashing, or any work that involves pulling the frame out is work for a crew that does this every week. If you’re unsure whether you have a failing part or a failing installation, call (432) 233-0976 and we’ll talk through what you’re seeing before anyone schedules a visit.
FAQs
ES Windows with a low-E insulated glass package and proper installation typically last 20 – 30 years on a San Antonio home, but the glazing seal and hardware often need attention around year 12 – 15 depending on sun exposure. Call (432) 233-0976 and we’ll assess what you’re working with.
Yes, in many cases we can replace the insulated glass unit, the balances, rollers, or weatherstripping without pulling the entire frame, which keeps the repair cost well below a full replacement. Call (432) 233-0976 for a written quote on the specific part.
A single window replacement on an existing opening usually takes half a day once the part is on-site; a full addition or ADU with ES Windows glazing runs weeks, not days, because it’s a build, not a swap. We’ll give you a written schedule with the written price.
We keep common ES Windows hardware, weatherstripping, and balance components in our San Antonio inventory, and we order full windows and insulated glass units to spec when the project calls for it. Call (432) 233-0976 and we’ll check stock for your specific model.
If you have an ES Windows addition or ADU project in San Antonio, or a failing unit you need matched and installed right, call (432) 233-0976 for a free estimate. Graham Stein will walk the project with you, write the scope down line by line, and give you a price before any work starts.
Written by Graham Stein, Owner, Elmstead Remodeling San Antonio at Elmstead Remodeling San Antonio, serving San Antonio and nearby areas.
