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ES Windows Home Additions & ADU: The Houston Owner’s Guide
Home additions and ADUs built around ES Windows products in Houston typically run $45,000 to $130,000 installed, depending on square footage, foundation work, and how many windows the project ties into. We stock ES Windows-compatible framing components, flashing, and trim packages, and we can usually match parts to your existing units within one or two days. Most Houston homeowners discover they need this work when a window in an existing addition starts fogging between panes or a header shows signs of settling, and the addition itself was never properly flashed around the original ES Windows installation.
What you’re dealing with is rarely just one failed part. It’s usually a chain: a window that was set without proper sill pan flashing, water that crept into the rough opening, and a header that’s now carrying more load than it should. We see this constantly in Houston additions built during the 2010s boom, when crews were moving fast and flashing details got skipped. Curtis Lane has reviewed hundreds of these scopes, and the pattern is always the same: the window itself is fine, but everything around it wasn’t built to hold up under Houston’s rain-and-humidity cycle year after year.
Which ES Windows Models This Applies To
ES Windows makes a range of aluminum and aluminum-clad window and door products common in Houston’s mid-century and custom-home stock. The compatibility question comes down to two things: the series stamp on the frame and the glass pack thickness. Most ES Windows units we work around are either the 300 series (single-hung, aluminum frame) or the 500 series (thermally broken, used in higher-end additions and ADUs). The series stamp is on the inside edge of the frame, usually on the hinge side or top rail, and it’s the single most useful piece of information for matching parts.
Here’s the compatibility gotcha most homeowners miss: ES Windows changed its corner key design around 2014, and the old square keys do not seat correctly in newer frame extrusions. If your addition was built before 2014, we’re matching to the older extrusion profile, which means we order from a different parts lot and sometimes machine the corner key slot by hand. That matters because using the wrong corner key on an ES Windows frame means the miters open up within a season or two in Houston’s humidity. We flag this on every estimate, and we write the exact profile number into the scope so there’s no guesswork later.
We also install high-quality aftermarket equivalents where they make sense, but for structural components around ES Windows, we stay OEM or close to it. The frame dimensions are proprietary enough that a generic corner key or mullion clip causes visible gaps and air leaks, which in a Houston ADU means higher cooling bills and condensation on the interior glass. We work with a documented parts network and we can also match ES Windows-compatible parts alongside KraftMaid, Cambria, and Silestone materials when the project involves cabinetry or surface work adjacent to the window openings.
Styles & brands we work with
Signs Your ES Windows Home Additions & ADU Is Failing
- Fogging or condensation between panes. The glass pack’s seal has failed, and in Houston’s humidity, that trapped moisture turns into visible fog you can’t wipe away from either side. This is the most common early sign that the window unit itself needs replacement, not just the surrounding trim.
- Sticking or dragging sashes. The frame has shifted, often because the rough opening was oversized and the shims compressed over time. In additions built on expansive clay soil, the settling is gradual, and the window is the first thing to bind.
- Water stains on interior drywall below the window. The sill pan flashing was either omitted or installed incorrectly, so water that gets past the outer seal runs down inside the wall cavity instead of draining out. By the time you see the stain, the substrate is usually soft.
- Visible gaps at the miter joints on the frame corners. The corner keys have failed or the frame was over-shimmed during installation. Once the miters open, air and water move through the gap, and the window’s insulation value drops sharply.
- Doors in the addition that no longer latch cleanly. The addition’s framing has moved enough to throw the door opening out of square. That’s not a hinge problem; it’s a foundation or header problem, and it needs to be scoped before more finish work goes in.
See the difference
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AfterReplacement Cost & What’s Included
For a home addition or ADU project in Houston that involves ES Windows products, the installed price range is $45,000 to $130,000. The spread comes down to square footage, whether we’re working on a slab or pier-and-beam foundation, how many window openings need to be re-flashed or re-framed, and whether the existing ES Windows units are being reused or replaced. A smaller bump-out with two or three ES Windows units and no foundation work lands at the lower end. A full ADU with a new kitchen, bathroom, and six or more windows lands at the top, and often above it once utility rough-ins are factored in.
A written price before any work starts is non-negotiable. That’s The Garrison Standard, and it means the number on your estimate is the number on your invoice, period. Every scope includes the R&R of damaged framing around the window openings, new flashing, new trim, and proper insulation at the rough opening, plus the window units themselves if needed. The work is covered by the 365-Day Done Right Promise: if anything fails within the first year, we come back and correct it at no charge. Houston’s climate will test a window opening, and we write the guarantee knowing that.
DIY or Call Us?
You can safely do the detective work yourself. Check the series stamp on the ES Windows frame, look for water staining around the interior sill, and watch whether the sashes drag or stick during the hot months. That gives you a clear picture of what’s failing and what to tell whoever you call. What you should not do is start pulling trim or cutting into the rough opening. Once you expose the flashing and the substrate, you’re now dealing with structural water intrusion, and in a Houston addition, that often means hidden rot that extends further than a visual inspection suggested.
There is no part of this that’s a weekend project once framing is involved. The danger isn’t dramatic, it’s just unforgiving: a window that’s set a quarter-inch out of square will leak for years in a way you can’t see from the outside. We scope it, write the number, and do the work. Call (940) 289-7658 for a free estimate, and we’ll tell you straight whether this is a fix or a full rebuild.
FAQs
ES Windows frames typically last 30 to 40 years, but the glass pack seals often fail in 10 to 15 years in Houston’s heat and humidity. The frame outlives the sealed unit almost every time, which is why a lot of our work is preserving the frame and replacing the glass, not the whole window.
Yes, if the frame is square and the damage is limited to the glass pack or the flashing, we can repair the window opening and keep most of the existing ES Windows unit. If the frame itself is twisted or the rough opening has shifted, replacement is the honest fix. Call (940) 289-7658 for an exact assessment, and the estimate is free.
Most projects run 3 to 6 months, depending on permitting and the foundation scope. The window and rough-opening work itself is usually one to two weeks of that timeline.
We stock the common corner keys, mullion clips, and flashing profiles for ES Windows 300 and 500 series frames on our trucks, and we can get OEM glass packs within a few days. We also carry components that work across KraftMaid, Cambria, and Silestone materials when the project scope includes those finishes.
Straight scope, straight number – that’s the whole conversation. Call (940) 289-7658 and we’ll walk your addition, read the window stamps, and put the price in writing before you decide anything.
Written by Curtis Lane, Owner, Bradford Remodeling Co Houston at Bradford Remodeling Co Houston, serving Houston and nearby areas.
