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ES Windows Home Additions & ADU: The Woodland Hills Owner’s Guide
If you’re planning a home addition or ADU in Woodland Hills with ES Windows, the full installed cost typically lands between $45,000 and $130,000 for an addition, and $90,000 to $220,000 for a detached ADU. That range covers permits, foundation work, framing, roofing, and the ES Windows themselves, which run roughly $8,000 to $25,000 as a line item on most projects. Most Woodland Hills owners don’t discover a problem with their ES Windows until the addition is already underway and they find a cracked frame, a failed seal, or glass that doesn’t meet current Title 24 energy codes for the Valley’s heat load.
What most people don’t realize is that a failed or missing window part on an addition isn’t just a window problem. It can stop framing inspection cold, push back your rough-in schedule, and delay drywall by weeks. We’ve seen it happen on projects near Warner Center and throughout Woodland Hills, where the summer sun exposes a failed seal or an undersized frame faster than almost anywhere else in Los Angeles County. The good news is that matching an ES Windows product to the right replacement part is something we handle every month, and we carry the common failure points on the truck.
Mason Remodeling Co Woodland Hills is an independent contractor and not affiliated with ES Windows. We work with their product lines daily, and we stock or can source the parts that keep your addition or ADU moving.
Which ES Windows Models This Applies To
ES Windows builds residential aluminum and vinyl window systems, and the parts story changes depending on which series you have. The most common lines we see in Woodland Hills additions are the ES Advantage series (aluminum, thermally broken), the ES Premier line (higher-end aluminum with narrower sightlines), and the ES vinyl series used in a lot of ADU and garage conversion work where cost per opening matters. Each series uses different balance hardware, different sash locks, and different weatherstripping profiles. An Advantage sash lock will not fit a Premier frame, and a vinyl-series balance won’t work in an aluminum track, even if the sash width looks close at a glance.
Here’s how to identify what you have before you call. Look at the corner of the frame or the edge of the operable sash. ES Windows stamps a four-to-six character code there, usually etched into the aluminum or printed on a vinyl sticker. That code tells us the series, the frame depth, and the glass package. If the code is worn off or the frame was painted, measure the visible glass width and height to the nearest 1/8 inch, then measure the frame depth. We match parts by those dimensions plus the series code. On ES Windows specifically, the frame depth on the Advantage series is 3-1/4 inches, while the vinyl series runs closer to 2-3/4 inches, and mixing parts across those two is the single most common mistake we see in Woodland Hills DIY attempts.
OEM versus aftermarket: for visible, structural parts like sash locks, keepers, and hinges, we recommend OEM parts from ES Windows because the finishes match and the hole locations are exact. For concealed parts like balances, pivots, and weatherstripping, there are quality aftermarket equivalents that perform well and sometimes last longer than the original, especially in Woodland Hills where heat and dry air degrade rubber and plastic faster. We walk every customer through that choice in plain language before we order anything.
Styles & brands we work with
Signs Your ES Windows Home Additions & ADU Is Failing
- Sash drops when you let go of the handle. The balance cartridge or spring has lost tension. On ES Windows Advantage series, this usually means the spiral balance inside the jamb has stripped or the shoe that holds the sash has cracked. In Woodland Hills, repeated thermal cycling from hot afternoons to cool nights accelerates this failure.
- Condensation or fog between the glass panes. The insulated glass unit has lost its argon fill and the seal has failed. This is a manufacturing-window issue, not a cleaning problem, and it’s common on south-facing elevations in Woodland Hills where direct sun beats on the glass all afternoon.
- Crank or sliding hardware binds or grinds. The operator gear teeth have worn or the track has collected enough grit from dry Santa Ana winds to jam the rollers. On ES casement windows, the operator arm usually fails before the crank handle itself.
- Drafts you can feel around the sash perimeter even when locked. The weatherstripping has compressed or the interlock between sashes has bent. In an addition or ADU, a drafting window will show up in your energy bill before you feel it, especially during July and August in Woodland Hills.
- Frame corrosion or white chalky powder on aluminum surfaces. The anodized or painted finish has broken down. This is surface-level at first but will eventually compromise the structural screw bosses where hinges and locking hardware attach, and salt air from the coast can make it worse, even nine miles inland in Woodland Hills.
See the difference
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AfterReplacement Cost & What’s Included
The installed cost to replace a failed ES Windows part in Woodland Hills depends on what actually failed and whether we’re matching an existing opening or working inside a new addition or ADU rough opening that hasn’t been closed up yet. That’s the biggest driver of the range. The upper end usually involves sites near the 101 where access is tighter, or ADU builds where we need to coordinate with other trades working in the same space.
The pricing guidance on this page applies to the broader addition and ADU scope. A full home addition in Woodland Hills runs $45,000 to $130,000. A detached ADU runs $90,000 to $220,000. A garage conversion runs $30,000 to $80,000. Inside those projects, the ES Windows line item is usually $8,000 to $25,000 depending on how many openings you have, the series you choose, and whether you need custom sizes for an architect-drawn opening. For a window part problem mid-build, we quote parts and labor separately, so you see exactly what you’re paying for, and the price we hand you is the price you pay. Every replacement part we install is covered by our 365-Day Done Right Promise from the date of completion.
DIY or Call Us?
You can safely check a few things yourself before calling. Look at the frame stamps to identify the series. Photograph the failure point. Write down the inside width and height of the visible glass. That information saves a trip. What you shouldn’t do is remove the sash or disassemble a balance cartridge. ES aluminum frames carry the sash weight through spring-loaded balances under tension, and removing the wrong screw or prying the wrong clip can send a metal shoe flying. It’s not a scare tactic; it’s the same reason we send a trained technician with the right jig to release that tension safely.
On anything where aluminum, glass, or spring tension is involved, the better call is a phone call. We’ll walk you through the identification over the phone, tell you whether it’s a stock part or a one-to-two-week order, and give you a written price before we touch anything. Call (831) 290-6866 and we’ll figure out what you need together.
FAQs
A properly installed ES Windows balance cartridge or sash lock typically lasts 10 to 18 years in Woodland Hills, but sun exposure and dry heat push the lower end of that range on south-facing and west-facing walls. Weatherstripping lasts 5 to 10 years, and insulated glass seals usually survive 10 to 15 years before fogging starts. We replace parts fast enough that a failed component doesn’t hold up your building schedule. Call (831) 290-6866 for an exact assessment.
Some components can be repaired, like realigning an operator arm or cleaning a track, but weatherstripping, balances, and insulated glass units are replacement items by design. They’re built as sealed or tensioned assemblies; once they fail, the repair is the replacement. We’ll tell you straight which situation you’re in. Call (831) 290-6866 and we’ll price the honest fix.
Most single-window part replacements on an addition or ADU take one to two hours once we have the part in hand. If it’s a common failure item on the Advantage or vinyl series, we often have it on the truck. If it’s a custom order, we’ll have written pricing for you within a day and the part arrives in one to two weeks.
Yes. We stock the most common ES Windows failure parts for the Advantage, Premier, and vinyl series, including balance cartridges, sash locks, keepers, and operator arms. For other brands you may have in the same home, we also handle parts for KraftMaid cabinetry, Cambria surfaces, and Silestone countertops.
Call Mason Remodeling Co Woodland Hills at (831) 290-6866 for a free estimate. Tell us what series you have and what’s failing, and we’ll give you a written price before anyone steps foot on your property.
Written by Isaac Pruett, Owner, Mason Remodeling Co – Woodland Hills, CA at Mason Remodeling Co Woodland Hills, serving Woodland Hills and nearby areas.
