O'Fallon, MO Window Replacement and Installation Services

We can complete any window installation project, no matter the size. From a single window installation to a full home installation of new windows, we are your source for outstanding service.

Expert Installations

The Coldstream Exteriors team specializes in vinyl, wood, fiberglass and composite window installations to suit your preferences and budget. Count on our team to replace a few windows or install new windows on your entire home.

Lifetime Warranties

Our lifetime warranty offers peace of mind for your new installations. If glass breaks on one of our windows, our team will fix it for free.

Added Functionality

New windows from Coldstream Exteriors can boost curb appeal, but they also improve the functionality of your home. Enjoy improved energy efficiency and added security features to keep you and your home safe.

You can rely on our team for expert window installations and replacements in O'Fallon. Whether your windows need an update or you're searching for a new look, our services can boost curb appeal and improve energy efficiency. We operate on a quick timeline and communicate actively with our clients to include them in our process.

Our approach has earned us an A+ Rating from the Better Business Bureau (BBB) and multiple awards from Angie's List and HomeAdvisor. With over 25 years of experience and more than 5,000 customers served, you can count on us for installations and replacements in Missouri.

Energy Star logo

Energy Star Certified

Many of the window products we carry are ENERGY STAR certified. While our windows can elevate your home's exterior, we strive to reduce your heating and cooling costs with your window replacements. Our installation experts will install and seal your windows properly to keep the elements out all year, so you can stay comfortable in hot summers and cold winters.

Why Do Clients Choose Coldstream Exteriors?

  • More than 25 years of experience in the industry
  • Premium window brands with competitive pricing
  • Zero money down until project completion
  • A fully insured company
  • Free estimates and inspections
  • Accolades from Angie's List and HomeAdvisor
  • A dedicated project manager for your installation

Count on Our Team for Window Installations

Coldstream Exteriors supports your installation process from start to finish. First, we work with you to find the best window products for your style and budget. As we work through the installation, your dedicated project manager will keep you informed about our progress. 

Our team has all the tools and expertise needed to complete your installation correctly and efficiently. You can trust we'll deliver high-quality results and leave your property as clean as when we arrived.

We Replace as Many Windows as You Need

Our experts handle your replacements with care, regardless of scale. We assess your current windows and offer recommendations for new products based on your preferences. You can count on your project manager as a single point of contact throughout the project, and we'll dispose of your existing windows as part of your replacement.

Our High-Quality Window Materials

At Coldstream Exteriors, we only use high-quality materials and premium products to complete our installations and replacements. Your project manager can explain our material options to help you identify the right direction for your style and durability preferences. Our materials include wood, fiberglass, vinyl and composite. We also custom-design windows and offer various glass options like privacy and stained glass.

Request a Free Estimate Today

We treat every project with integrity, honesty and commitment to client needs. Call us at (314) 380-8111 to request a free estimate or contact us online.