Glass Block Windows
Glass block replaces a failing basement window with a solid, mortared panel. No sash to pry, no frame to rot, and daylight without the view in.
We've been building and setting glass block across Will, Cook, and DuPage counties since 1986. Most basement openings are finished in a single day.
Stop Drafts and Secure Your Basement
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Maintenance-Free
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Energy-Efficient
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Harder to Break Into
Glass Block Basement Windows
Most of the glass block we install goes into basement openings where the original steel or wood unit has given out.
A glass block panel replaces the whole assembly rather than patching it.
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Built to the Opening You Have
Old basement openings are rarely square, and almost never a catalog size. We measure each one and build the panel to fit rather than shimming a stock unit into place.
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Vented and Dryer Vent Options
A latching hopper vent gives you cross-ventilation when you want it. We can also set a dryer vent block directly into the window so the exhaust runs outside with no gap in the seal.
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Sealed at the Perimeter
We pull rotting wooden sills and seal where the panel meets the masonry. That perimeter is where most air movement through a basement opening starts.
Sizes, Patterns, and Custom Panels
Glass block is built up from individual units, so the panel is sized to the opening rather than the other way around.
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Standard and Non-Standard Openings
Typical basement openings fall in a common range, but we build to whatever is there.
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Thinline Block
We use Thinline block at 3⅛" thick. It's lighter than full-depth block, which matters in older openings that were never built to carry the extra weight.
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Pattern Choices
Wave, diamond, and ice patterns differ in how much they obscure the view. We'll show you samples before anything is ordered.
Still Deciding if Glass Block is Right for You?
Why Homeowners Choose Glass Block
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Harder to Break Into
No Sash or Frame to Pry — a mortared panel has no moving parts and no frame edge to work a bar into.
Solid Through the Opening — Thinline block is 3⅛" of glass set in mortar across the full opening.
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Privacy Without Losing Daylight
Obscure Patterns — wave and diffused patterns pass light while breaking up the view from outside.
No Curtains or Film Needed — the privacy is in the block itself, so nothing to maintain.
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Nothing to Paint, Rot, or Rust
Maintenance-Free — glass and mortar don't need refinishing the way wood and steel units do.
Stops Basement Drafts — sealing the opening cuts the air movement that makes a basement cold through an Illinois winter.
What Glass Block Windows Cost
Most glass block basement openings run $550 to $950 installed. Where a given opening lands depends on size, pattern, and whether it needs a vent unit.
That's an installed price, not a materials quote — it covers removing the old window, building the panel, setting it, and sealing the perimeter.
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What Moves the Number
Opening size — larger panels use more block.
Vent units — a hopper or dryer vent block adds to the panel cost.
Condition of the opening — rotted sills or damaged masonry take extra work.
How We Install Glass Block Windows
Every panel is built for the opening it's going into. Our own crews do the work start to finish — no subcontractors.
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We Measure the Opening
We come out and take the actual dimensions rather than working from a standard size.
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We Build and Set the Panel
The old unit comes out, the block goes in with mortar, and the perimeter is sealed on both sides.
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Usually One Day
Basement glass block installation is a one-day job in nearly every case.
Why Homeowners Choose Legacy Glass Block & Window Co.
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SINCE 1986
Family-owned and installing glass block windows across Will, Cook, and DuPage counties since 1986.
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5-STAR GOOGLE RATING
Homeowners consistently rate us five stars.
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LIFETIME WARRANTY
Every glass block window we install is backed for as long as you own the home.
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NO SUBCONTRACTORS
Our own crews handle every install, start to finish.
SEE WHY LOCAL HOMEOWNERS TRUST LEGACY
Don't just take our word for it — see why homeowners rate our glass block work five stars.
YOUR GLASS BLOCK INSTALLATION JOURNEY
START YOUR PROJECT WITH A FREE ESTIMATE
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SCHEDULE A CONSULTATION
Tell our local experts about your specific exterior home needs.
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CUSTOMIZED MEASURING PROCESS
We visit your property to capture every exact window dimension.
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RAPID EXPERT INSTALLATION
Most projects are finished in a single day.
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FINAL WORK INSPECTION
We carefully verify every seal and joint for perfect performance.
ZERO DOWN PAYMENT OPTIONS AVAILABLE
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Budget-Friendly Monthly Plans
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No Upfront Costs Required
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Interest-Free Payment Terms
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READY TO UPGRADE YOUR BASEMENT WINDOWS?