Therma-Tru Window Replacement Nationwide

Therma-Tru Window Replacement: The Woodland Hills Owner’s Guide

Replacing a Therma-Tru window in Woodland Hills typically runs $550 to $1,450 installed per unit, depending on frame material, glazing package, and whether it’s a standard size or a custom rough opening. We stock Therma-Tru-compatible hardware, weatherstripping, and full sash assemblies on our trucks, which means most single-window replacements are done in one visit with a written price before we start. The usual story we hear: a window that won’t close flush against the frame, visible condensation trapped between the panes, or a latch that spins without catching. You feel the draft before you see it – especially on mornings when the Santa Ana winds push hard against west-facing walls up near Topanga Canyon Boulevard.

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Which Therma-Tru Models This Applies To

We work on the full Therma-Tru residential lineup across Woodland Hills homes, but the bulk of replacements fall into three buckets: the Classic-Craft series (wood-grain composite frames known for deep exterior profiles), the Smooth-Star line (a flush fiberglass exterior that holds paint well in direct valley sun), and the Pulse series (the foam-core composite line that handles heat cycles better than most). The compatibility gotcha most owners hit: Therma-Tru’s older Smooth-Star sash from the early 2000s used a narrower glazing pocket than the current production. Measure your glass pocket depth before ordering – if it’s under 1 1/8 inch, you’re looking at an older-profile sash and need a retro match, not a current-production unit. We ID parts by the AAMA label sticker on the hinge side of the frame, or by the four-digit date code stamped on the lower corner of the sash. Here’s the honest take on OEM vs aftermarket: Therma-Tru’s genuine replacement parts keep the full glass warranty intact, but quality aftermarket equivalents from PGT or CGI often give you better U-factor numbers for the same money. We’ll quote both options and let the numbers do the talking. We’re an independent Woodland Hills service provider, not a Therma-Tru dealership – that means we match the part to your home, not to a sales quota.

Signs Your Therma-Tru Window Replacement Is Failing

• Condensation between the panes. This means the insulated glass unit (IGU) has lost its seal. The argon or krypton fill is gone and the low-E coating starts oxidizing. In Woodland Hills humidity swings – dry summers, damp winter mornings off the Santa Monicas – a failed seal shows up as fog you can’t wipe away.
• The sash drags or catches when you open it. Therma-Tru composite frames expand and contract less than vinyl, but the side jamb weatherstripping wears flat after 8 to 12 years. You’ll feel it bind near the middle of the track on south-facing walls that get hammered by afternoon sun in Winnetka and Warner Center.
• You can feel daylight or airflow at the lock rail. The compression weatherstrip under the locking mechanism loses its spring after repeated open-close cycles. Test it with a dollar bill: if it slides out without resistance along the sill, the seal is spent.
• The latch spins without engaging. Therma-Tru’s cam-style locks on Smooth-Star units use a zinc catch that strips its teeth over time. This isn’t the latch failing – it’s the cam profile wearing into a circle, and the fix is a new lock kit, not a new window.
• Visible exterior frame cracking or flaking at the bottom corners. Composite frames stand up to valley heat well, but the painted finish on older Classic-Craft units can delaminate after a decade of UV exposure. Once moisture gets under the coating, the corner joints start to move.

Replacement Cost & What’s Included

For Woodland Hills homes, here’s what we charge, in writing, before a single screw turns:

• Full sash replacement (standard size, stock glass): $550 to $780 installed
• Full sash replacement (custom size or impact-rated glass): $780 to $1,100 installed
• Complete frame-out replacement (old rough opening, reframing required): $1,100 to $1,450 installed
• Glass-only IGU swap (frame and hardware stay): $340 to $600 installed

What drives the range: whether your opening matches Therma-Tru’s standard sizes, the glass package (dual-pane clear, low-E, or impact-rated for homes backing up to open brush zones near the 101), and whether the existing nailing fin or flange is reusable. Every quote includes parts, labor, haul-away of the old unit, re-insulation of the rough opening, and re-caulking inside and out. All work carries our 365-Day Done Right Promise: if the install isn’t right, we make it right – parts and labor, in writing, for a full year.

DIY or Call Us?

Here’s the split I’d give a friend. You can safely do this: a dollar-bill draft test to confirm a seal failure, checking for AAMA sticker placement to ID your series, and cleaning the track. What gets people in trouble: swapping a sash on a second-story window without a proper ladder setup, attempting a full frame-out on a stucco exterior (the waterproofing detail under the sill is where Woodland Hills homes get water intrusion during winter storms), or removing the interior stops without marking their positions – you’ll never get them reseated square. A dropped sash also weighs more than you’d think, 30 to 45 pounds on a large Classic-Craft unit, and it’ll take out a tile floor on the way down. If any of that sounds like more than a Saturday, call us at (831) 508-3441 and we’ll bring the right sash, the right seal, and the right ladder. Sean Mackey’s rule from the job site: get the numbers right the first time, or you’re caulking over somebody else’s mistake.

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