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ES Windows Home Additions & ADU: The Houston Owner’s Guide
If you’re planning a home addition or ADU in Houston with ES Windows specified, expect to invest between $45,000 and $130,000 for the full project, with ES Windows installation typically running $8,000 to $25,000 of that budget depending on window count, size, and series. We stock and install ES Windows-compatible components for additions and ADUs across Houston, and we can usually begin sourcing within one business day of your written estimate. Most homeowners come to us after realizing their existing window package won’t carry into the new space, or when an architect has spec’d ES Windows and they need a contractor who actually knows the product line well enough to order and install it correctly.
What we see on job sites around Houston is a pattern: a family adds a second-story primary suite or builds a backyard ADU for aging parents, and the window selection becomes the linchpin. The wrong frame depth, the wrong glass package for our humidity, the wrong flashing detail against Hardie plank, and the new space sweats through August. ES Windows makes a good product. The Houston part of that equation is getting the install right for our climate. We do that every week.
Which ES Windows Models This Applies To
ES Windows offers several series lines, and the compatibility question matters more in Houston than people expect. The main lines we work with on additions and ADUs are the ES Advantage series (aluminum, thermally broken, the most common for modern additions) and the ES Premium series (heavier aluminum frames with larger glass areas, often spec’d for ADUs with floor-to-ceiling window walls). There’s also the ES Classic line, which we see less often on new work and more on matching existing window styles when a Houston homeowner adds onto a 1980s or 1990s house that already has ES Windows.
The identification detail that trips people up: ES Windows stamps their series code on the spacer bar inside the glass unit, not on the frame. You need to read the code between the panes, usually starting with “ES” followed by a two-digit series number and the manufacturing date. We can do that check in about ten minutes during an estimate visit. The second gotcha is frame depth. Houston additions built to current energy code typically call for thermally broken frames, and if someone orders non-thermal ES Windows by mistake because the price was lower, the city’s energy inspection will flag it. We verify the spec against your permit drawings before we order a single window, because reordering glass for a 4,000-square-foot addition is a six-week delay nobody wants.
OEM versus aftermarket: for ES Windows-specific components like clips, receivers, and flush bolts, we recommend OEM. The tolerances on ES frames are tight, and aftermarket hardware rarely seats correctly. For glass, sealants, and flashing, a quality Houston supplier’s equivalent product performs just as well and often costs less. We’re an independent contractor, not an ES Windows affiliate, so our only interest is telling you which parts deserve the brand name and which don’t.
Styles & brands we work with
Signs Your ES Windows Home Additions & ADU Is Failing
If you already have ES Windows in an existing addition or ADU and something feels off, here’s what we typically find on service calls around Houston. Each symptom has a cause, and most are repairable without replacing the whole window.
- Condensation between the panes. The seal around the insulated glass unit has failed, and Houston’s humidity has gotten inside the air gap. This is the most common failure we see here, and it usually appears first on west-facing windows that take the full afternoon sun.
- Difficulty sliding or locking the sash. Aluminum frames expand and contract with Houston’s temperature swings, and over time the rollers or the locking cam drift out of alignment. It’s rarely the glass itself, and the fix is usually under $300 per window.
- Water staining on the interior drywall below a window. The flashing or the sill pan was installed incorrectly when the addition was built. We see this a lot in ADUs that were contractor grade builds from the start. Water is getting behind the frame, not through it.
- Drafts you can feel on windy days. The weatherstripping on ES Windows is a replaceable part, and after five to seven years in Houston’s heat it compresses and loses its spring. Drafts are usually a weatherstripping job, not a window replacement.
- A window that won’t stay open or closed. ES Windows balance systems wear out, especially in ADUs where the windows get opened daily for cross-breeze. The hardware is available and the fix is straightforward.
See the difference
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AfterReplacement Cost & What’s Included
For a full ES Windows home addition in Houston, the $45,000 to $130,000 range covers construction, finishes, and window installation. If you’re scoping just the windows for that addition or ADU, ES Windows installation typically runs $8,000 to $25,000 in Houston, depending on how many openings, which series you’re buying, and whether the install requires scaffolding or a lift. Linear footage, glass package upgrades for Houston’s climate (low-E and argon are standard recommendations here), and frame color all move the number.
Our written price includes the windows, the flashing, the sealants, the haul-away of the old windows if it’s a replacement situation, and the labor. You see the line items before we start, and that price doesn’t change once the crew is on site unless you change the scope. Graham Stein reviews the window schedule against your plans personally before we order, because a misordered window is a delay he’s not willing to put a Houston family through. Every ES Windows install we do carries the 365-Day Done Right Promise: if something isn’t right after the job is complete, we come back and make it right.
DIY or Call Us?
You can read the spacer bar code between the panes yourself, and you can check for visible caulk failure around the exterior frame. That’s worth doing before you call, because it helps us know what we’re walking into. What we’d ask you not to do is pull an ES Window frame out of an opening on your own. These are heavy aluminum units, and getting one out without damaging the rough opening, the flashing, or yourself takes a second set of hands and the right setup. We have seen homeowners order the correct replacement window and then damage the sill pan on removal, which turns a clean swap into water damage repair six months later.
If you’re wondering whether your ES Windows addition or ADU windows need replacing, repairing, or just servicing, call us at (254) 272-5240 and we’ll send a technician out to look. The estimate is free, and you’ll get a written price before any work begins, every time.
FAQs
ES Windows with thermally broken aluminum frames typically last 25 to 35 years in Houston, though the insulated glass units often need seal repair or replacement at the 15 to 20 year mark because of our heat and humidity. The frames outlast the glass seals in this climate, which is why we recommend addressing seal failures when you first notice condensation rather than waiting for the frame to fail too. Call (254) 272-5240 and we can inspect which is failing on your windows.
Yes, most ES Windows issues in Houston are repairable: weatherstripping, rollers, balance systems, locking cams, and individual insulated glass units can all be replaced without touching the frame. Full replacement only makes sense when the frame itself is damaged or when you’re changing the window size as part of an addition or ADU build. We’ll tell you which camp your windows fall into during the estimate.
A typical window package for a Houston ADU takes two to three days to install once the windows arrive on site, and a full home addition’s window package usually runs three to five days. Lead time on the windows themselves depends on the series and any custom sizes, generally two to four weeks from order to delivery in Houston. We include the expected timeline in your written estimate.
We keep common ES Windows replacement parts on our trucks including rollers, weatherstripping, locking hardware, and balance systems, and we can source series-specific insulated glass units through our Houston suppliers within a week in most cases. For whole-window orders on additions and ADUs, we place the order directly with the supplier once your written estimate is approved. We also work with KraftMaid, Cambria, and Silestone products for the interior side of your addition, so the windows and the finishes come from one crew.
Written by Graham Stein, Owner, Elmstead Remodeling Houston at Elmstead Remodeling Houston, serving Houston and nearby areas.
