Professional Window Replacement Backed by Local Experience
Your windows are one of the most important components of your home’s energy efficiency, safety, and curb appeal. At DNS Exterior, we specialize in professional window installation and replacement for homeowners in Lockport, IL and surrounding areas, including Joliet, Orland Park, Romeoville, and Homer Glen.
Whether you’re replacing outdated windows, dealing with a drafty room, or upgrading your home’s exterior, our team delivers high-quality workmanship, trusted window brands, and fast turnaround times—with satisfaction guaranteed.
Why choose DNS Exterior:
- 10+ years of experience serving Lockport and southwest Chicagoland
- Fully licensed, bonded, and insured
- ENERGY STAR® certified product options
- Fair pricing with no hidden fees
- Manufacturer and labor warranties
Why Window Installation Is a Smart Investment
If your home is older or showing signs of wear, there’s a good chance your windows are underperforming. Knowing when to replace them can save you money, improve comfort, and boost your home’s value. Here are common signs it’s time to call for a window replacement in Lockport:
When is it time to replace your windows?
Drafts or Rising Energy Bills
If you’re noticing cold spots near your windows or a spike in your utility bills, the issue might be poor insulation. Drafts are a red flag that your windows are no longer sealing properly. In most cases, this is a clear reason to consider window installation in Lockport—especially if your frames or sashes are aging.
Condensation Between Panes
Moisture trapped between glass layers is a telltale sign of seal failure. This issue can’t be fixed with cleaning—it usually requires full window replacement to restore clarity, insulation, and energy efficiency.
Difficulty Opening or Closing
Sticking, jamming, or sagging windows are more than just an inconvenience. These problems can signal warped frames, worn tracks, or swelling from years of weather exposure. If left unchecked, they can become safety hazards and may require window repair in Lockport or full replacement.
Faded Furniture and Floors
Sun-damaged furniture and flooring could be caused by outdated windows that lack modern UV protection. New double- or triple-pane windows with Low-E glass can reduce fading while still allowing natural light.
Outdated Appearance
Old windows can make your home look dated and reduce its curb appeal. Replacing them with modern, energy-efficient models not only elevates your home’s style but also increases its resale value—especially when installed by a trusted window contractor in Lockport like DNS Exterior.
Replacing your windows can cut energy bills by up to 30%, reduce street noise, boost your home’s value, and create a more comfortable living space year-round.
🔍 Pro Tip: If your home was built before 2000 and the original windows are still in place, it may be time to consider an upgrade for better efficiency and safety.
Energy-Efficient Windows Made for Illinois Weather
Illinois homeowners need windows that can handle the freeze-thaw cycle, heavy snow, strong winds, and humid summers. We install energy-efficient, weather-resistant windows that help insulate your home and reduce your HVAC load.
What makes a window energy efficient?
- Low-E (low emissivity) glass – Reflects heat while letting in natural light
- Argon or krypton gas fills – Provide insulation between glass panes
- Multi-pane designs – Double and triple-pane options reduce thermal loss
- Durable frames – Vinyl, fiberglass, and composite frames resist warping and rot
We’ll walk you through the best styles and options for your needs—balancing performance, aesthetics, and budget.
Window Types We Install
Explore our most popular window options below:
Double Hung Windows
These versatile, classic windows feature two operable sashes that slide vertically. They offer easy cleaning and improved airflow—ideal for homes in Lockport and nearby areas seeking practical, everyday functionality.
Casement Windows
Hinged at the sides and opening outward, these windows provide unobstructed views, excellent ventilation, and a tight seal for energy efficiency—perfect for catching those cool Illinois breezes.
Sliding Windows
Ideal for wide horizontal openings, sliding windows deliver a sleek, modern look and smooth gliding operation. They’re great for rooms facing patios, walkways, or decks.
Awning Windows
Hinged at the top and opening outward, awning windows allow ventilation even during light rain. These are excellent additions to bathrooms, kitchens, or basements.
Picture Windows
Large, fixed-pane windows that frame expansive outdoor views and bring in ample natural light. While they don’t open, they dramatically enhance aesthetics and energy efficiency.
Bay Windows
Made up of three windows that project outward, bay windows add space, dimension, and a custom-built feel to living rooms, dining areas, or master bedrooms.
Bow Windows
Similar to bay windows but using four or more panes, bow windows create a graceful curve that enhances both interior space and exterior architecture.
Garden Windows
Designed to extend outward from the house, garden windows create a small shelf-like area with glass on all sides. They’re perfect for growing herbs or displaying plants—especially in kitchens.
Hopper Windows
Often found in basements or small spaces, these inward-opening windows are compact, secure, and perfect for letting in fresh air while maintaining privacy.
Architectural Windows
These custom-shaped windows—from circles and arches to trapezoids—are used to add personality and visual interest to any home. They can be combined with other window types for a truly unique look.
Whether you’re looking for traditional double-hung or custom architectural windows, DNS Exterior has the options and experience to help you choose the right fit for your home.
Trusted Window Brands We Install
The window manufacturers we partner with at DNS Exterior are leaders in the industry when it comes to energy efficiency, longevity, and quality. These brands are carefully selected to match Illinois weather and local building codes—while giving your home exceptional style and functionality.
Marvin® Windows and Doors
Marvin is known for high-end, custom-built windows made right here in the Midwest. Their products combine energy efficiency with elegant architectural styling, ideal for homeowners who want premium performance and aesthetics.
ClimateGuard® UltraView
A popular choice for Chicagoland homeowners, ClimateGuard manufactures energy-efficient vinyl windows designed specifically for Midwest weather. Their UltraView line offers great performance at a competitive price.
Pella® Windows and Doors
Pella offers a wide range of window styles—from wood to vinyl—backed by strong warranties and excellent service. Their designs suit both modern and traditional homes and are available in multiple performance tiers.
✅ We’ll walk you through each option during your estimate to help you select the right brand, style, and material based on your budget, energy goals, and design preferences.
Other Brands We Can Source
In addition to our preferred brands, we’re also familiar with other nationally recognized window manufacturers such as Andersen® Windows, Simonton®, and ProVia®. If you have a specific window brand in mind, we’re happy to discuss compatibility and availability during your free estimate.
💬 Your home, your choice—we’ll make sure it’s installed right.
Our Window Installation Process
We make window installation easy, from first consultation to final inspection.
Here’s how it works:
- On-site assessment
We visit your home, assess your needs, take precise measurements, and answer any questions. - Detailed estimate
You’ll receive a clear, itemized quote with all options explained—no sales pressure, ever. - Scheduling & prep
We coordinate a convenient installation date and handle all prep work, including permits if needed. - Professional installation
Our crew arrives on time, installs your new windows efficiently and safely, and leaves the site clean. - Final walkthrough & warranty
We inspect everything with you and ensure you’re fully satisfied before wrapping up.
Why Lockport Homeowners Choose DNS Exterior
DNS Exterior isn’t a national chain—we’re a local, family-owned business based right here in Lockport, IL. Our reputation is built on honest service, quality work, and long-term customer relationships.
What sets us apart:
- Local team with deep knowledge of building codes and weather conditions
- Transparent pricing with financing available
- Dedicated project manager from start to finish
- Fully backed by manufacturer and workmanship warranties
- Strong community reputation with 5-star reviews across Google, Yelp, and Facebook
⭐⭐⭐⭐⭐
“These guys are the best!. they were professional, fast and cleaned up well. My windows, facia, gutters were in bad shape. the job they did was nothing less than beautiful. I recommend them easily and I will use again. thanks guys!!”
— Laurie Cyz
Frequently Asked Questions (FAQs)
How much does window installation cost in Lockport, IL?
The cost of window installation in Lockport, IL varies depending on the window type, quantity, and materials used. Most homeowners can expect to pay between $500–$1,200 per window installed. DNS Exterior offers free estimates to give you accurate pricing for your home.
Do you work with insurance claims?
Yes, DNS Exterior can assist with window replacements related to storm, wind, or hail damage. We help document the issue and work directly with your insurance provider to streamline the claim process.
How long does it take to install new windows?
Most window installation projects take one to two days, depending on how many windows are being replaced and the condition of the existing frames. Larger or custom installations may take longer.
Can I install windows in winter?
Yes, winter window installation is possible and common in Illinois. Our team uses special cold-weather techniques to minimize heat loss and ensure a tight, energy-efficient seal—even during colder months.
Do you offer custom finishes and colors?
Absolutely. We offer a variety of frame finishes, hardware styles, and interior colors to match your home’s design. Custom orders are available with brands like Andersen and Pella.
Our Window Service Area
DNS Exterior is proud to serve homeowners across:
Schedule Your FREE Window Consultation Today
If your windows are drafty, outdated, or just ready for a fresh look—let DNS Exterior help. We provide expert advice, premium products, and professional installation with no high-pressure sales tactics.
Window Replacement Testimonials
"We had our windows and front door replaced. House looks great. Loved working with Jeff at DNS."
- Bill Q.
"We desperately needed one window replaced, after calling around to a few other companies DNS was the only one to return our call and within a day a representative came to give us an estimate, we placed our order and were very pleased with their professionalism. When it comes time to replacing the other windows, DNS will be the company we use."
"They did an excellent job on my multiple-window replacements for our home! Affordable, clean and friendly! A+"
- Mary K.
"We had windows and siding replaced a number of years ago with DNS. Over the years I have reached out to Jeff and/or Sean from DNS for a few minor issues with the windows from time to time. Without a doubt my issues have been dealt with professionally and to my satisfaction. They have gone out of their way to assist with the issues. I am pleased that they have continued to stand behind their products and work even after the many years that have passed. Not many places will continue to take care of their customers after 10+yrs."
- Sean M
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