Experience Perfect Window Installation
Serving Downers Grove and surrounding areas since 1996. Get a free estimate, we respond within 24 hours
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Who We Are

1ST Window Replacement & Installation

With over 30 years of experience serving Chicagoland homeowners, we know what it takes to get the job done right. We install and replace windows and patio doors using premium brands like Marvin and Pella, built to last, installed to fit.
  • 30+ years in business
  • Marvin & Pella certified
  • Serving Chicago Suburbs
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Our Services

What We Have to Offer You

Patio Door Installation

Transform your space with a professionally installed patio door — sliding or French style, built to last.


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Window Installation

New construction or replacement. We handle the full installation from measurement to cleanup.


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Window Replacement

Old, drafty windows? We'll replace them in a single day with energy-efficient models from Marvin or Pella.


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How We Operate

Step-by-Step Your New Windows

Personalized Quote

Contact us and we'll get back to you within 24 hours to discuss your project and schedule a visit. No pressure, no obligation.

Measurement & Planning

We come to your home, take precise measurements, and help you choose the right windows for your style and budget.

Window Order & Delivery

Our company orders directly from trusted manufacturers like Marvin and Pella. Most windows arrive within 2–4 weeks.

Seamless Installation

Our crew handles the full installation, typically completed in a single day. We clean up and leave your home exactly as we found it.

We supply

The Variety Of Windows Available

Wood Windows

Classic look, excellent insulation and efficiency. Best for traditional-style homes.

Clad Windows

Wood interior, weather-resistant exterior finish. Low maintenance, exceptionally long-lasting.

Fiberglass Windows

Extremely durable and highly energy-efficient. Holds up in virtually any climate.

Vinyl Windows

Affordable, low maintenance, great insulator. A popular choice for most homes.

Basement Windows

Built for below-grade conditions, moisture-resistant, secure, and highly durable.

Patio Doors

Smooth operation, energy-efficient glass, available in sliding and French door styles.

Gallery

Latest Projects

Our Gallery

Reach out for reliable and affordable window solutions tailored to your home!

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Opinions

What Our Clients Say About Us

Calvin H.

Window replacement was seamless. The crew removed my old windows and installed new, energy efficient ones quickly and professionally. My gone feels more comfortable already.

Jabrey R.

Window replacement was completed perfectly. their team ensured a flawless fit and used durable, energy-efficient materials, my home feels more comfortable, and I'm very satisfied with their service.

Rashed B.

The window installation they did in our dining room has completely transformed the space. The team was professional, the windows are beautiful, and the whole experience was fantastic.