Window Replacement in Chicago
Old windows letting in cold air and driving up your energy bills? Pegasus Construction replaces drafty, failing windows across Chicago with energy-efficient, code-compliant installations built for the Midwest climate.
Window Replacement Built for Chicago Homes
Efficiency and Comfort, Locked In
Most Chicago bungalows and two-flats still run on original single-pane windows from the 1950s–70s. They’re costing you hundreds every winter. Pegasus replaces them with Energy Star–certified double- or triple-pane windows, properly flashed and air-sealed so the job holds through decades of Chicago freeze-thaw cycles.
Signs Your Windows Need Replacing
- Drafts and cold spots around the frame
- Foggy or condensation between the panes
- High heating and cooling bills
- Drafts and cold spots around the frame
- Foggy or condensation between the panes
- High heating and cooling bills
Windows That Save Energy & Improve Your Home
Your Window Replacement, Handled End to End
We manage your window replacement from measurement and product selection through removal, installation, flashing, and trim—so every window is air-tight, level, and finished inside and out. No subcontractors, no surprises.
Styles & Glass Built for the Midwest
The most common replacement styles for Chicago homes. Easy to clean, tight seals, and available in vinyl or fiberglass to match any exterior.
Double-Hung & Casement
Maximum insulation for Chicago winters. Low-E coatings block UV and reduce heat transfer—keeping rooms warmer in January and cooler in July.
Triple-Pane & Low-E Glass
Expand your view and bring in more light. We frame and flash oversized windows correctly so they stay leak-free through years of Chicago weather.
Picture & Bay Windows
We help you select the right window style, glass package, and frame material for your home—and handle everything from measurement through final trim.
Windows Built for Chicago’s Homes
We Know Chicago’s Older Housing Stock
Chicago’s bungalows, greystones, and two-flats have unique rough opening sizes and historic trim profiles. We measure every opening individually and source windows that fit—no hacks, no filler strips.
Built for Chicago Weather
Zone 5 winters demand more than bargain-bin vinyl. We install windows rated for Chicago’s climate: warm-edge spacers, argon-filled IGUs, and foam-backer rod air sealing that holds through decades of freeze-thaw cycles.
Permits & Chicago Building Code
Like-for-like size replacements are generally permit-exempt under Chicago Building Code 14A-4-402. If you’re changing opening size or adding an egress window, we pull the permit and handle inspections.
Neighborhoods We Serve
From Lincoln Park and Lakeview on the North Side to Beverly and Bridgeport on the South Side—Pegasus replaces windows across all 77 Chicago neighborhoods and the surrounding suburbs.
Years Serving Chicago
Projects Completed
15 Google Reviews
Licensed, Bonded & Insured
Our Simple Three-Step Plan
Schedule a Free Estimate
Call or fill out our form. We’ll set up a free, no-pressure estimate at a time that works for you.
In-Home Measurement & Selection
We measure every opening on-site and walk you through window styles, glass packages, and color options that fit your home and budget.
Professional Installation
Our crew removes the old windows, installs and flashes the new ones, and finishes interior and exterior trim—usually in a single day.
More Ways Pegasus Can Help
Window Installation
New window installs for additions, new construction, or when you need a different opening size.
Siding Installation
Protect your home with fiber cement, vinyl, or engineered wood siding built for Chicago weather.
Affordable Window Replacement, Flexible Payments
Low rates and friendly loan consultants make your project easier on the budget. We offer financing to help you get started sooner.
Servicing Chicago and the Surrounding Suburbs
Chicago Neighborhoods
Surrounding Suburbs
Our team of experienced builders has a solid track record when it comes to creating exceptional spaces. We ensure that the construction process is stress free, with transparent communication on both deadlines and cost estimates – guaranteeing you’ll no un welcome surprise.
Window Replacement FAQs
How long does a window replacement take?
Most single-family homes with 10–15 windows are done in one day. We remove old windows, install, flash, and trim inside and out before we leave.
Do I need a permit to replace windows in Chicago?
Like-for-like replacements that do not change the rough opening size are typically permit-exempt under Chicago Building Code 14A-4-402. We advise you on your specific project.
What is the best window brand for Chicago?
Andersen, Pella, and Harvey Building Products are all solid for Chicago’s Zone 5 climate. We match the product to your budget and the existing trim profile of your home.
How much does window replacement cost in Chicago?
Vinyl double-hung windows run roughly 00–00 per window installed; fiberglass and wood-clad windows range 00–,200+. We provide a firm written estimate before any work begins.
Can you replace just the glass instead of the whole window?
If the frame is structurally sound and not rotted, yes—an IGU swap can fix foggy or failed-seal glass. We assess each window and recommend the most cost-effective solution.
What is a warm-edge spacer and why does it matter?
Warm-edge spacers reduce heat conduction at the glass edge—the coldest spot on a window. They cut condensation on the frame and improve overall U-factor, which matters a lot in Chicago winters.
How much can I save on energy bills after replacing my windows?
Savings vary by home, but replacing old single-pane or failing double-pane windows with new energy-efficient units commonly reduces heating and cooling costs by 10–25%, especially in older Chicago homes with drafty original windows.
Do you handle window replacement for two-flats and multi-unit buildings?
Yes. We work on single-family homes, two-flats, three-flats, and small multi-unit buildings throughout Chicago and the suburbs.
Ready to Stop Losing Heat Through Your Windows?
Get a free estimate from Pegasus Construction and see how much you can save with energy-efficient window replacement.
