CWS Window Replacement Nationwide | Sightline Windows & Doors Boca Raton

CWS Window Replacement: The Boca Raton Owner’s Guide

CWS window replacement in Boca Raton typically runs $340 to $780 per opening installed, depending on the series, glass package, and whether the frame is salvageable. We stock CWS-compatible frames, sashes, and hardware for same-day replacement on most standard sizes. Homeowners usually discover the problem when a sash won’t stay open, visible moisture appears between the glass lites, or the locking mechanism no longer draws the sash tight against the weatherstrip - often after a tropical storm or years of UV exposure on the east-facing walls common in Boca Raton’s coastal neighborhoods.

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Which CWS Models This Applies To

CWS Window Systems manufactures several residential lines, and the part you need depends on which series is in your wall. The most common we encounter in Boca Raton are the CWS 3120 single-hung, the CWS 5400 impact-rated line, and the CWS 8800 architectural series. Each uses a distinct sash balance system, frame depth, and glazing bead profile. The 3120 uses a constant-force coil balance; the 5400 and 8800 use a block-and-tackle balance rated for impact loads. These are not interchangeable.

To identify your series, check the etched mark in the glass corner or the label on the frame head. If the label is gone, measure the frame depth from interior to exterior: 2-5/8 inches indicates the 3120, 3-1/4 inches the 5400, and 4-1/2 inches the 8800. We carry OEM CWS balances, sash cams, and tilt latches, plus quality aftermarket equivalents from Truth Hardware and Caldwell where the OEM lead time exceeds what a Boca Raton homeowner should wait during rainy season. Sightline Windows & Doors Boca Raton is an independent service provider, not affiliated with CWS. We specify by what the opening requires, not by what is in stock.

One compatibility gotcha: CWS revised its glazing bead profile in 2019. Pre-2019 beads are squared; post-2019 are radiused. A mismatch means the bead will seat but not lock, and the IG unit (insulated glass unit) will drift under pressure. We verify this with a sample bead from our truck before ordering glass.

Signs Your CWS Window Replacement Is Failing

• Sash drops or won’t stay open. The balance system has lost tension. In Boca Raton’s salt-air environment, coil balances corrode faster than inland specs predict; we see this at 8 to 12 years instead of the 15-year rating. A sash that slams shut is a finger hazard and means the balance is fully failed, not just weak.
• Fog or moisture between the glass panes. The IG seal has breached. Once argon or air escapes, the desiccant saturates and the glass fogs permanently. Boca Raton’s afternoon thunderstorms and near-100% humidity accelerate this; a failed seal in July will show visible condensation within 48 hours.
• Lock engages but sash still rattles. The keep (strike plate) has wallowed out, or the sash cam has worn. This is common on CWS units with heavy daily use, especially patio-facing windows in rental properties near Spanish River and Mizner Park. The lock hardware is replaceable; the cam often requires full sash replacement if the cam slot is elongated.
• Frame corner gaps or sealant separation. Thermal expansion cycles in South Florida’s climate stress the frame corners. CWS welds are generally sound, but the expansion coefficient of dark exterior colors (bronze, black) causes more movement than white. We check corner square with a digital level; anything over 1/8 inch out of square means the frame is twisting, not just the sash.
• Cracked or chipped glass with impact pattern. Even without penetration, the laminated interlayer in impact-rated CWS units can delaminate from the glass. This compromises the rating and is not repairable. Insurance typically covers this in Boca Raton, but they require documentation of the impact source and pre-damage condition. Our photo record on every visit supplies that.

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Replacement Cost & What’s Included

What drives the range: size, glass package (clear, Low-E, impact-rated), and whether the existing frame is plumb and square. A frame that has settled with the slab requires more labor than a clean swap. Every quote we write in Boca Raton includes the measured survey you keep, the written scope, and the photo record. The price on the page is the price on the invoice; Haven Clause 1 governs this. Our 365-Day Done Right Promise covers the installation and hardware. Glass is covered by the manufacturer’s warranty, which we register at completion.

DIY or Call Us?

There is one thing a CWS owner can safely check: the weep holes at the frame sill. If they’re clogged with debris or paint, water will pool and enter the wall. A paper clip or compressed air clears this. Do not attempt to remove the sash or replace the balance yourself. CWS sashes on impact-rated units weigh 40 to 70 pounds; the balance is under spring tension, and the tilt latches are plastic that becomes brittle in Florida UV. A dropped sash cracks the glass, and a released balance spring can strike with force. We have replaced DIY-attempted jobs where the owner bent the track trying to force the sash back in.

If you see fog, feel a draft, or the sash won’t behave, the measurement is free and the price is written before we start. Call (561) 200-8592.

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