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.

Coldstream Exteriors
Based on 89 reviews
powered by Google
Chris KoenemanChris Koeneman
21:49 06 Jan 23
I cannot say enough good things about my experience with having a new roof installed by Coldstream Exteriors. My sales rep/project manager, Ricky, was absolutely outstanding. He was exceedingly honest, upfront, and responsive in all of our dealings with him.His team did an excellent job installing the roof, and we have been very happy with both the look of it, quality, and workmanship. I was extremely impressed that Ricky also came over after the job was completed to make sure that the roof was up to Coldstream's standards. He also personally went around the perimeter of the house double-checking to make sure that the nails from the old roof were picked up. I really appreciated that level of care and the fact that Ricky was there from the beginning to the end. He did all of the little things even when they were something that would take more time for him but not make him any additional money. As a former sales person myself, I really appreciated that. I feel like most sales people would be there for you for the sale and as soon as you sign the contract, you would not hear from them again. That is certainly not the case with Ricky or Coldstream.Overall, I could not be more pleased with Coldstream and will definitely be recommending them to all my friends and family (and have already referred my parents). Thanks again, Coldstream.
Karen WattsKaren Watts
15:08 10 Dec 22
Brandon Van Buren was the project manager and awesome! He assisted me in making the shingle selection and was very patient. The crew did an excellent job!
Bob BatesBob Bates
14:20 09 Nov 22
Great experience with Coldstream Exteriors. Amanda, Operations Manager, Brian McDonough, Project Manager and roof installation crew were all professional, courteous and polite. Installation only took 2 days and the crew were always on time and work hard the whole time. After installation they cleaned up thoroughly for debris and nails in my yard and neighbors. Overall we are extremely happy with the results and look of our new roof. Will definitely recommend Coldstream Exteriors to others.
Robert FryRobert Fry
01:45 27 Jul 22
It was clear to me from the initial meeting, at the bid solicitation with their sales representative (Brandon) that I was dealing with a professional organization. The proposal was explained thoroughly, precisely and with such detail that I thought this place really knows their business.I was so thoroughly convinced that I signed at the first meeting.We were not disappointed: They followed through with every item on the proposal. The workers replacing the roof were unbelievably hard working, careful to protect the plants below, and never seemed to let up even in the extreme summer heat.We could not be more pleased with Coldstream Exteriors. They do quality work, communicate throughout from beginning to end, and clean up debris thoroughly. We could not be happier, nor chosen better for our new roof.An additional bonus that I was not aware of until their sales representative told me about it……the roof we chose is eligible for a 15% discount on our homeowners insurance. We already have the check from the insurance company.Most importantly our new roof is beautiful, so much nicer than its replacement.We couldn’t be happier with Coldstream Exteriors…..so glad we chose them for the job.
Bryce CahillBryce Cahill
17:06 23 Nov 21
What an amazing job!The wonderful folks of Coldstream did an amazing job on my flat room. My roof was very old an in need of a lot of repair. Brian was extremely helpful in coming out, and taking great estimates of what it would take to protect my house. Flat roofs are not as common these days so Brian even had his top notch roofer come out and give his opinion as well. I had the whole roof replaced at a great price! The roof looks amazing. Brian’s communication throughout the entire deal was awesome. And they did everything in a very fast manor, it only took them a few days. All before winter just as requested. The crew was very nice, and even cleaned off my back patio of all the leaves that were there. 10/10 would use Coldstream Exterior again.