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ECO Window Systems Home Additions & ADU: The San Francisco Owner’s Guide
A home addition or ADU built with ECO Window Systems products in San Francisco typically runs $53,100 – $153,400 installed, depending on square footage, foundation work, and window package. We stock and install ECO Window Systems-compatible windows, doors, and hardware for additions and ADUs throughout San Francisco. Most owners discover a problem when fog builds between panes, a crank operator fails, or a slider starts dragging against its track months after the framing crew packed up.
What makes an addition or ADU different from a straight window swap is sequencing. The windows go in at rough framing, before drywall, before paint. If a part fails after that, you’re not just swapping a sash, you’re protecting finished interior work. We’ve corrected enough post-construction window failures in the Outer Sunset and Inner Richmond to know the difference between a ten-minute hardware fix and a full-unit replacement that requires cutting back stucco or siding. Curtis Lane and our crew have been through this enough times in San Francisco that we can usually tell you over the phone which one you’re looking at.
Which ECO Window Systems Models This Applies To
ECO Window Systems manufactured several series lines over the years, and the part you need depends on which one went into your addition or ADU. Their vinyl and aluminum-clad lines share some hardware, but not all of it. The sliding patio door rollers on their earlier aluminum series are not interchangeable with the later vinyl series, even when the door panel width looks identical. That’s a compatibility gotcha that catches a lot of people off guard.
The fastest way to identify your unit is the small etched or printed label on the spacer bar between the glass panes, usually in one corner. It lists the manufacturer, series, and sometimes the date code. If that label is faded, we measure the glass thickness and check the corner construction. ECO Window Systems used a specific corner key on some vinyl lines that aftermarket suppliers don’t always match cleanly. For most repairs, OEM parts are the right call because the tolerances are exact. For things like crank handles, lock levers, and screen clips, a quality aftermarket equivalent works fine and costs less. We’ll tell you which is which before you spend a dollar.
Styles & brands we work with
Signs Your ECO Window Systems Home Additions & ADU Is Failing
- Condensation between the panes. The seal has failed and the insulating gas has escaped. This is the most common failure we see in San Francisco, especially on west-facing units in the Sunset and Richmond where morning fog hits warm interior glass. The fix is a replacement sash or full unit, not a repair.
- Crank operator slips or grinds. The gear teeth inside the operator have stripped, usually from forcing a window against a warped frame. The operator is replaceable, but if the sash itself is binding, you’ll strip the new one too.
- Sliding door drags or jumps the track. The rollers are worn, or the track has collected enough debris to score the roller wheels. In San Francisco’s damp air, track corrosion accelerates this. New rollers and a track clean usually solve it.
- Lock or latch won’t engage. This is often misalignment from foundation settling, which is a real issue in parts of San Francisco built on fill. The lock may be fine; the window frame is the problem. We check square before we swap hardware.
- Drafts you can feel with the window closed. The weatherstripping has compressed or the frame has shifted. On an ADU, this means higher heating bills and moisture intrusion. It’s rarely the glass itself; it’s the seal around it.
See the difference
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AfterReplacement Cost & What’s Included
For ECO Window Systems windows and doors within a San Francisco home addition or ADU, here’s what we charge. A single sash replacement for a failed seal runs $5,310 – $17,700 installed depending on size and series. Full-unit replacements within an existing opening run $9,440 – $29,500 for a standard addition window package. Complete ADU window and door packages, installed at rough framing, fall within the broader $106,200 – $259,600 ADU construction range.
What drives the number is access. A second-story unit requiring ladder work or a lift adds labor. Stucco exterior patching costs more than siding touch-up. Lead-safe practices on pre-1978 homes add contained cost. Every estimate from Bradford Remodeling Co San Francisco includes the part, the labor, the disposal, and the written guarantee before work starts. No numbers move at the door. That’s The Garrison Standard, and it applies to every window job we take in San Francisco.
DIY or Call Us?
You can check the label on the spacer bar, confirm whether the window is square with a level, and clean the tracks and weep holes on a slider. Those are reasonable homeowner tasks. What we don’t recommend is pulling a sash out of a second-story rough opening or prying trim off a finished wall to reach a frame flange. Gravity and stucco have opinions, and a dropped sash at height is a serious injury risk. If the window is above ground level, if the frame is embedded in stucco, or if the failure is a fogged seal, leave it to a trained professional.
For San Francisco homeowners, a wrong guess on a part number means another week of drafts and a second service call. We’ll identify the exact ECO Window Systems part from the label, bring it to the site, and install it with the opening protected and the work area left clean. Call (831) 610-5598 if you want a straight answer on whether this is a simple swap or something bigger.
FAQs
How long do ECO Window Systems windows last in San Francisco?
In San Francisco’s coastal climate, expect 15 – 25 years from a quality window before seal failure becomes likely. Fog-driven moisture and salt air shorten the life of seals and hardware compared to inland California. Units facing the Pacific in the Outer Sunset and Outer Richmond fail sooner than east-facing units in the Mission or Noe Valley.
Can a fogged ECO Window Systems window be repaired instead of replaced?
A fogged sealed unit cannot be repaired. The glass must be replaced, either as a full sash or as an insulated glass unit installed into the existing frame. The frame itself is usually still good, which keeps the cost below a full window replacement. Call (831) 610-5598 for an exact number on your specific unit; estimates are free.
How long does a window or door replacement take on an addition or ADU?
A typical single-unit swap in a finished addition takes 2 – 3 hours on site. A full ADU window package at rough framing usually takes one to two days, coordinated with your framing schedule. We’ll give you a written timeline with your quote and hold to it.
Do you stock ECO Window Systems parts in San Francisco?
We stock the common items: crank operators, lock levers, roller sets, screen clips, and weatherstripping for the series lines most often installed in San Francisco additions and ADUs. Special-order items like custom sashes or unusual glass packages take longer. Tell us the label information and we’ll confirm what’s on hand before scheduling you.
Written by Curtis Lane, Owner, Bradford Remodeling Co – San Francisco, CA at Bradford Remodeling Co San Francisco, serving San Francisco and nearby areas.
