Chicago Suburbs · Licensed & Insured
Premium window replacement for suburban Chicago homeowners. Every installation backed by a lifetime warranty and a fixed-price guarantee.
Why Homeowners Choose Us
Every window contractor sells double-hungs and casements. Here are six concrete things that separate the way we work from the way it's usually done.
A recent project
"I had a great experience with this window installation company! The owner was extremely helpful and always quick to respond. The installation was done efficiently and with great care — everything was clean, quick, and professional. It's clear they take pride in their work."
Natalia N.
Elmhurst, IL
"We had a fantastic experience with Illumination Windows. The team arrived on time, worked efficiently, and treated our home with great care. They kept everything clean, removed all debris, and explained how to best care for our windows afterward. The difference is remarkable."
James & Carol B.
Elmhurst, IL
"Eight windows, on time, seamless work inside and out, complete cleanup. You'd never know they were there — except that everything works beautifully now."
Michael T.
Downers Grove, IL
Schedule your free in-home consultation — same-day quotes, no obligation, no pressure.
Window Solutions
From classic double-hungs in historic bungalows to custom arched windows in contemporary builds — installed with meticulous precision.
Both sashes travel independently for versatile ventilation and easy interior cleaning. The tilt-in design keeps maintenance effortless year-round.
Side-hinged and crank-operated, casement windows compress their seal as they close — producing outstanding weatherproofing and dramatically reducing noise infiltration.
Projecting window configurations that add dimensional space, architectural drama, and a flood of natural light. Custom-measured and reinforced for a permanent, seamless fit.
Fixed, non-operable panes with maximum glass-to-frame ratio. No moving parts means outstanding thermal efficiency and long-term reliability. Often combined with operable flankers.
Horizontal sliding sashes on a smooth track. Clean, contemporary profile that works especially well where casement units would interfere with exterior walkways or landscaping.
Arched tops, full circles, half-rounds, octagons, triangles — fabricated to exact dimensions and installed to preserve the architectural DNA of your home. The difference between a renovation and a transformation.
Brands We Install
Our specialists guide you through the options — free, in your home, same day.
How It Works
From the first call to the final walkthrough, every step is designed to make your window replacement predictable, stress-free, and exactly right.
Step One
A specialist visits your home at a time that suits you. We evaluate your existing windows, understand your priorities — comfort, aesthetics, noise reduction — and take a first look at scope.
Step Two
You receive an itemized written quote the same day. Every window listed individually with specifications, pricing, and timeline. Our quotes are fixed-price — what we write is what you pay.
Step Three
Once confirmed, a technician returns to measure every window to fit your home perfectly. Your windows are made-to-order — no filler strips, no compromises.
Step Four
Our certified crew arrives on schedule, protects your floors and finishes, and installs your windows with precision. We clean up completely — inside and out.
Step Five
Before we leave, we walk through every window with you — testing operation, inspecting seals, confirming you're satisfied. We issue your lifetime warranty documentation in writing, on the spot.
We stand behind every installation — for life. Our confidence in our craft is the strongest guarantee we can offer.
Your free consultation is one call away.
Where We Work
From the inner-ring villages to the outer reaches of DuPage, Cook, Kane, Will, and Lake counties — we come to you.
Cook County
DuPage County
Kane & Will Counties
Lake County
Client Reviews
Real feedback from homeowners across the Chicago suburbs who trusted Illumination Windows with their homes.
★★★★★I had a great experience with this window installation company! The owner was extremely helpful and always quick to respond. The installation was done efficiently and with great care, everything was clean, quick, and professional. It's clear they take pride in their work.
Natalia N.
Elmhurst, IL
★★★★★Greg was super easy to work with and everything was really simple. John installed the windows and was polite and timely, he do a great job and I'm so happy to have windows that I can actually crack open a few inches now :) they look beautiful
Lauren E.
Elgin, IL
★★★★★Awesome experience! Greg is very professional.Job was done fest, clean and very officiant in middle of cold weather. Strongly recommend this company to anyone. Thank you Greg.
Barbara, K.
Mount Prospect, IL
★★★★★We had a fantastic experience with Illumination Windows. They were knowledgeable, friendly, and attentive. The windows we chose are high quality, reasonably priced and manufactured locally in Illinois. The team arrived on time, worked efficiently, and treated our home with great care. The team kept everything clean, removed all debris and explained how to best care for our windows afterward. The difference is remarkable: our home is quieter and more comfortable. The windows operate smoothly and feel secure.
Elmhurst, IL
James & Carol B.
★★★★★Greg was incredible. He consulted with my wife and I and ensured we got everything we were hoping for! He really pulled out all the stops for us and I can't recommend him and John enough!
Vaishika, R.
Chicago, IL
★★★★★"Eight windows, on time, seamless work inside and out, complete cleanup. You'd never know they were there — except that everything works beautifully now."
Michael T.
Downers Grove, IL
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Our Story
Illumination Windows exists because window replacement should feel reliable, not like a gamble. Clear pricing, skilled installation, and a warranty you can actually count on.
Our Values
We treat every home as if it were our own — protecting floors, cleaning up completely, and leaving no trace except better windows.
Fixed-price quotes. Itemized contracts. No scope creep. The quote you receive is the bill you pay — always, without exception.
Every installer is trained and certified. We follow manufacturer protocols precisely — correct installation is what makes a great window perform like one.
We live and work in the Chicago suburbs. Our reputation is built one neighbor at a time — which means we can't afford to cut corners or disappear.
Our lifetime warranty isn't marketing — it's a commitment we honor. If our work causes an issue, we come back and fix it. No runaround, no charge.
You'll always know what's happening and when. We answer calls, keep appointments, and follow up. Communication is part of good service.
A Word From the Owner
"Every homeowner we spoke to remembered the same feeling — excitement at the quote, disappointment at the end. Somewhere between the promise and the project, something got lost. We built Illumination Windows to make sure it never does. What we say is what you get, from the first conversation to the final installation."
— Founder & Owner, Illumination Windows · River Forest, IL
A free consultation starts with a simple conversation.
No Obligation · No Pressure
Tell us about your project and we'll schedule a free in-home consultation. Most quotes delivered same-day.