Free written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
ES Windows Home Additions & ADU: The Los Angeles Owner’s Guide
ES Windows home addition and ADU work in Los Angeles typically runs $53,100 – $153,400 installed, depending on square footage, foundation type, and how much of the existing structure we’re tying into. Homeowners usually call us after discovering their ES Windows frames or glazing won’t pass a Title 24 energy inspection, or after a window in the planned addition leaks during the first winter rain. We match ES Windows-compatible framing, flashing, and glazing to the existing product line so the new work looks like it was always part of the house.
If you’re planning an ADU or addition and your ES Windows are part of the equation, here’s what you need to know before anyone starts cutting holes in your house.
Key Takeaways:
- Full home additions with ES Windows integration in Los Angeles: $53,100 – $153,400
- Windows for an addition or ADU alone: $5,310 – $29,500 installed depending on count and series
- We write the price before work starts, and the number doesn’t change at the door
- Every job carries our 365-Day Done Right Promise in writing
Which ES Windows Models This Applies To
ES Windows makes aluminum-frame products that show up all over Los Angeles, especially in mid-century homes and the newer ADU builds going up in neighborhoods like West Adams, Leimert Park, and the eastern San Fernando Valley. The compatibility question matters more than most homeowners expect. ES Windows uses specific frame depths and glazing channels that aren’t interchangeable with the big-box vinyl frames a lot of general contractors reach for. If you have an ES Windows product in your existing house and want the addition to match, we need the model number off the edge of the frame or the original window schedule from when the house was built.
We work with OEM ES Windows parts where they’re available and sensible. For discontinued series or weeks-long factory lead times, we’ll recommend quality aftermarket equivalents that match the frame channel, glass thickness, and finish. We’ll tell you which is which and why before we order anything. Penhallow Remodeling Los Angeles is an independent contractor; we’re not affiliated with ES Windows, which is exactly why we can give you a straight answer on whether to wait for OEM or go with a matched aftermarket part.
Styles & brands we work with
Signs Your ES Windows Home Additions & ADU Is Failing
- Condensation between the glass panes. The seal on the insulated glass unit has failed. In Los Angeles, we see this most often on west-facing windows that take the full afternoon sun year-round. The fix is a new IGU sized to the ES Windows frame channel, not a caulk repair.
- Water staining below windows after rain. In additions and ADUs, the flashing at the sill or head wasn’t lapped correctly against the ES Windows frame. We find this on a lot of ADUs built fast in South LA and the Harbor area. Water runs behind the stucco and shows up months later as a brown stain.
- Windows that won’t open or close without forcing. The aluminum frame has shifted, or the roller or hinge hardware is worn. ES Windows frames are sturdy, but the hardware does have a service life, especially in coastal air out toward Long Beach where salt accelerates wear.
- Drafts you can feel on windy days. The weatherstripping has compressed past the point of doing its job, or the frame was never shimmed square. In a new addition, this is often an installation issue, not a product failure.
- Visible frame oxidation or pitting. Aluminum frames in Los Angeles hold up well, but within a few miles of the ocean the salt air will eventually get through a powder coat that was nicked during install. Left alone, it spreads under the finish.
See the difference
Before
After
Before
After
Before
AfterReplacement Cost & What’s Included
A dedicated window package for a home addition or ADU in Los Angeles runs $5,310 – $29,500 installed, depending on the number of windows, the ES Windows series, and whether we’re matching an existing finish. When the windows are part of a full addition, the $53,100 – $153,400 range covers everything: framing, drywall, stucco or siding, roofing tie-in, electrical, flooring, and the window installation itself.
What drives the price up: second-story work, engineered beam requirements when you’re opening a wall, foundation upgrades on older LA lots, and custom glass packages. What keeps it down: a simple single-story bump-out on a slab foundation with standard ES Windows sizes we can order without modification.
You’ll get a written price before any work starts. Not a range, not a verbal ballpark. The number we hand you is the number on the invoice unless you change the scope. And every job includes our 365-Day Done Right Promise in writing: if anything in the work fails inside a year, we come back and fix it at no charge.
DIY or Call Us?
Here’s the honest split. You can safely check the model number etched on your existing ES Windows frame, measure the rough opening, and photograph the window schedule if you still have the original plans. That information saves us both time. What you shouldn’t do is pull a window out of a load-bearing wall or try to flash a new opening yourself, especially in an addition where the wall is part of the structural envelope.
Glass handling alone is worth the phone call. A full ES Windows IGU for a large addition window can weigh 40 to 60 pounds or more, and a broken pane on a concrete slab is a medical bill waiting to happen. We send background-checked, uniformed technicians who do this work every day, and our written guarantee covers the install. If you’re in Los Angeles and you want the number first, call us at (213) 277-6578. We’ll give you the price before anyone picks up a tool.
FAQs
Expect 20 to 35 years from the frames and 15 to 25 years from the sealed glass units, with coastal homes trending toward the lower end due to salt air and sun exposure. We see the earliest failures on south- and west-facing windows within five miles of the ocean. Call (213) 277-6578 and we’ll take a look at what you’re working with and give you a straight answer.
Yes, in many cases we can replace the glass unit, hardware, or weatherstripping without pulling the entire frame, which saves you real money on a Los Angeles addition or ADU. The exception is when the frame itself is bent, heavily oxidized, or out of square from foundation movement. We’ll tell you which situation you have before recommending any work.
A window package for one ADU typically takes one to three days once the frames and glass are on site, though a full addition from foundation to finish runs six to fourteen weeks depending on scope. We’ll give you a written schedule with your written price, and we show up in the window we gave you. Call (213) 277-6578 to schedule a free estimate.
We keep common ES Windows hardware, weatherstripping, and balances on the truck, and we source glass units and frames from suppliers we’ve worked with for years across Los Angeles and the Basin. For less common or discontinued series, we’ll quote you the lead time honestly before you commit to anything.
Written by Trevor Nash, Owner, Penhallow Remodeling Los Angeles at Penhallow Remodeling Los Angeles, serving Los Angeles and nearby areas.
