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Denver's Best Windows, Siding, and Doors Company
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Create the Home of Your Dreams with a Custom Window Installation
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We'll help find the perfect Entry and Patio Door Replacements
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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.


Top Siding & Vinyl Replacement Windows Company in Denver 

Started by Leo Durocher in 2003 as a Local, Family Owned and Operated company, we are proud to say that Colorado Window Source is one of the few vinyl replacement window companies in Denver with an A+ Better Business Bureau Rating — earning the status of Gold Star membership for over five years running.

Though window is in our name — we do more than just windows! In addition to vinyl replacement windows in Denver, we offer a wealth of home services from window and door replacement and everything in between.  

Our window services, including basement window replacement in Denver, provide a robust selection of vinyl window options. At Colorado Window Source, we strive to earn your trust and your business again and again by providing top-notch service, experienced contractors, and a wide range of optionscolors, and styles.  

Learn more about Colorado Window Source and how we’re offering remote services & protecting our valued customers during the COVID-19 pandemic:

Get An Estimate

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!

Denver Vinyl Replacement Windows, Siding and Door

Replacement Windows

Ask Us About Financing!

Colorado Window Source 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.

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, 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.

A Truly Quality Vinyl Replacement Windows and Doors Company in Denver 

All Colorado Window Source 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 in Denver, Colorado.   

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.  

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 home project after three months, six months, and a year. This commitment is part of what makes CWS’s proven reputation of excellent service, shine.

CWS only works 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 no secret that Colorado Window Source 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 homeowners over 17 years, excellent service has earned Colorado Window Source the status of James Hardie Elite Installer since 2003.

Family-Owned Vinyl Replacement Windows Company With Proven Results  

Want to see it for yourself? Just read our reviews. It’s been our pleasure to serve the Denver area with pride since 2003, and our client’s satisfaction proves it. At Colorado Window Source, we strive to be the most punctual, informed, and reliable total window and door replacement company, and siding installers in Denver region. 

As a family-run business, we treat all our clients as if they were our neighbors because they are! If we wouldn’t install a product in our mother’s house, we won’t recommend it to you. When compared to the area’s Big Box stores and chain retailers, Colorado Window Source stands out against the competition with ease. 

Choose The Top Source for Vinyl  Window and Door Replacement Company in Denver   

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 Colorado Window Source 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 home 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 vinyl replacement window company in Denver for your home project—Colorado Window Source. 

Serving Denver Since 2003!

Leo Started Colorado Window Source back in 2003 and has watched it grow into a loving, family owned business that proudly services the Denver community.

(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

Colorado Window Source is a leading James Hardie Siding Installation contractor in the Denver Metro area, and one of the few siding installation companies in Denver 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.



“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