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Best Exterior, Windows, and Siding Company
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Your Trusted Choice for Premium Siding Installation
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Denver’s Best Exterior, Windows, and Siding Company

Now Offering Remote Quoting!

Just send us your rough measurements, a picture or two, and we will reach out, have a quick conversation, and get you an accurate quote – all while you are safely at home. Now you can get a quote without a pushy salesperson in your home offering those phony same-day discounts!

Financing Options Now Available!

Stop putting your project on hold. We can help find a solution that works for you. We have financing selections for virtually all of your windows, doors, or siding needs. See your personalized monthly payment options within minutes and get your project to go from concept to completion.

#1 Trusted Replacement Windows, Exteriors, and Siding Company

CWS Exteriors, Windows & Siding, a local, family-owned and operated company started by Leo Durocher in 2003, is proud to be one of Denver’s leading vinyl replacement window companies. With an A+ Better Business Bureau Rating and Gold Star membership status for over five years, we have proven our commitment to excellence.

While our expertise lies in vinyl replacement windows, we understand the importance of catering to the commercial sector. Multifamily units and condominiums are our primary focus. We also serve churches, daycare centers, and long-term care facilities, provided their window requirements align with our expertise.

At CWS Exteriors, Windows & Siding, we don’t offer services for storefront windows. Instead, we specialize in window and door replacement, full siding replacement, and other commercial property improvement services. Our goal is to provide top-notch service, experienced contractors, and a wide range of options, colors, and styles to earn your trust and repeat business.

To expand our reach in the commercial space, we are actively seeking partnerships with General Contractors and Property Managers. By collaborating with us, you can elevate your projects with our comprehensive window solutions, ensuring unparalleled quality and customer satisfaction.

Did You Know?
Our windows include 3 Layers of Energy Efficient Low-E Coating!
We don’t make you ‘upgrade’ to the 3 coat Low-E glass like other companies. It comes standard all the time because we believe in real value for our customers!

The Premier Choice for Vinyl Replacement Windows, Exteriors, and Siding in Denver 

Replacement Windows Company

Replacement Windows

Ask Us About Financing!

CWS Exteriors, Windows & Siding features our Tru-Warranty System.

Tru- Warranty: We personally follow up on your project after 3 months, 6 months and one year to ensure your complete satisfaction. Our lifetime-warranty on materials and installation is our guarantee and signature of quality.

Commercial James Hardie Siding

James Hardie Siding

Improve & Protect Your Home!

Tru-Choice: Our selection of affordable quality brand-name products ensures a variety of choices for you.

– We offer the most extensive and modem choices in color & style.
– Our popular wood finishes compliment today’s home designs.

Doors Roofs

Doors, Blinds & More…

Full Home Exterior Remodelers!

Tru-Price: We hope to earn your business by keeping our Tru-Price Promise.

– You will always receive our best competitive estimate and price.
– You can expect a simple, fast & comfortable quote experience with our “Quick Quote” in 30 minutes or less.

Monthly Payment Option

Experience Quality with Denver’s Top Vinyl Replacement Windows, Exteriors, and Siding Company

All CWS Exteriors, Windows, & Siding products are protected by our Tru-Price, Tru-Choice, and Tru-Fit system to ensure you receive the highest quality result on your home project.  

Tru-Price guarantees that our contractors will find you the best price available for the highest quality product. We also offer financing options for all our products and services.   

Tru-Choice is our commitment to informing our clients of all their available options and ensuring the best possible deal for them — without sacrificing beloved brand name products. On average, we save our clients up to $2,500 when compared to Denver area competitors.    

Tru-Fit is our exclusive fitting system designed to provide customers with the best fitting window and door replacement.   

The result is a high-quality product that’ll last for years to come and fits so well you’ll forget there was ever a draft in your home. Not only that, but Tru-Fit windows will save you thousands on your energy bills.  

Our vinyl replacement windows in Denver will upgrade your home’s insulation, keeping it cooler in the summer months and warmer in the harsh Colorado winters. Begin today by requesting a free Quick Quote from one of our many experienced project managers — we’ll get back to you in 30 minutes or less.  

Doors Roofs

Best Vinyl Replacement Windows Denver – Guaranteed Results with Tru-Warranty Coverage  

Should anything go wrong with your installed products at any time, all our products and services are backed by our incredible Tru-Warranty labor coverage. Our Tru-warranty is our in-house plan to inspect your commercial project after three months, six months, and a year. This commitment is part of what makes our proven reputation of excellent service, shine.

We only work with manufacturers that offer the strongest, gimmick free lifetime warranties. If anything goes wrong with your product, you can contact us and we will be happy to assist you through the warranty claim process.

It’s been our pleasure to serve the Denver area with pride since 2003, and our client’s satisfaction proves it. It’s no secret that CWS Exteriors, Windows, & Siding is among the leading companies for door and vinyl replacement windows in Aurora and the Greater Denver metropolitan area. Preferred by Denver’s premier contractors and thousands of property owners for over 17 years, excellent service has earned Colorado Window Source the status of James Hardie Elite Installer since 2003.

Dreaming of a Property Makeover? Denver’s Top Siding Installation Company Can Make It Happen  

Your property should be a reflection of your dreams and aspirations. Our mission is to turn those dreams into reality through top-quality commercial siding installation. From stylish and modern windows to versatile and durable commercial siding options, we offer a comprehensive range of products that will transform the look and feel of your property’s exterior.

Whether you’re looking for a classic, traditional aesthetic or a contemporary, minimalist design, we have the expertise to bring your ideas to life. With our extensive selection of colors, finishes, and styles, you can create a personalized and unique look that reflects your individual taste. If you’re dreaming of a property makeover, turn to the experts who can make it happen!

CWS Exteriors, Windows, & Siding Is the Company You Can Count On

When it comes to property improvement services in Denver and surrounding areas, choose CWS Exteriors, Windows, & Siding. We offer top-quality replacement windows, exteriors, and siding known for their quality and durability. Our advanced windows improve energy efficiency, while our exterior products enhance your property’s curb appeal.

What sets us apart is our exceptional customer service. From your first contact to the final installation, our team is here to assist you every step of the way. We prioritize building long-lasting relationships with our valued customers.

Top Windows, and Siding Installation Company

Our offices are open Monday through Friday from 8 am to 4 pm. Because we know our clients are hardworking people with busy schedules and hectic lives, we offer Saturday service by appointment.

Visit our showroom today to see our wide breadth of product offerings and talk to one of our experienced salespeople in the flesh! Our showroom is located at 1309B W Alameda Ave., Denver, CO 80223.

Still not sure if CWS Exteriors, Windows, & Siding is right for you? Allow us to show you. Contact us today fill out our Quick Quote Form—for a fast and easy estimate for your next project. We promise to offer the most competitive pricing and work with you every step of the way so that you can confidently choose the best exteriors, windows, and siding company for your project!

Serving Denver Since 2003!

(Featured in this photo: Leo, his wife Laura, their son Paolo, their cute pup named Cody and their curious cat, Vasilly)

Meet the CWS family!

James Hardie Elite Installer

CWS Exteriors, Windows, & Siding is a leading James Hardie Siding Installation contractor, and one of the few siding installation companies that features a showroom displaying many James Hardie siding choices. We are also one of only a few Denver, Colorado window companies that has an A+ Better Business Bureau rating.

James hardie elite installers



“Good Customer Service, prompt service, good personal attitude.”

Better Business Review

“The rep and installers were very warm and professional. We enjoyed working with them and plan on replacing the rest of our windows with Colorado Window Source.”

Google Review

Great product and service at a very competitive price. Install was exactly as promised and right on time.  Good guys to work with!

Yelp! Review