Get matched with top window and door contractors in O Fallon, MO

"Everything went great! We had an issue with one of the installed windows and they came back out and fixed it at no charge."

"Hyperion came out and gave a quote for the window replacements. Explained the work that would be done and how it would be done. Showed up on time to do the work and did a fantastic job. So rare now days that someone actually says what they are going to do, does it well and professionally."

"Very professional yet down to earth. Best price I found with great quality work. Answered every question I had and gave me a great sense of comfort throughout the whole process. Very time efficient. Replaced 14 windows, added a bay window, replaced 2 sliding glass doors, and replaced an existing garage door with a 4-panel sliding glass door. Only took 2 and a half days!"

"Quick and timely service. Quality excellent"

"Excellent job. He was on tine and quickly repaired our stuck front door. I will save his name for any future handyman jobs needed"

"STL Design & Build constructed a gorgeous deck off our kitchen and replaced windows and installed door to deck. The workmanship was excellent - well established and talented crews, built on time, and right on budget. Very impressed with the workmanship and also the quality of the materials (from wood framing, decking to windows and door. Very enjoyable experience. Great, great company. Reliable, honest, and professional."

"Ryan was prompt, courteous, and installed my new door and hauled the old door away in less than 2 hours. He did a great job and I am totally happy with my new door."

"The owner was quite knowledgeable and gave a very reasonable estimate for the installation of eight windows. The work crew were professional, friendly and did an excellent job, including cleaning up when finished. I highly recommend them!"

At Sane Windows and Doors, we believe in making the window and door buying experience as easy and transparent as possible. That’s why we stand out with superior customer support—from the moment you contact us to long after your project is complete. Unlike traditional sales-focused window companies, we skip the high-pressure pitches and in-home visits. With our no-sales-pitch appointments and simple online pricing, you can explore your options, get a quote, and make decisions—all from the comfort of your home. It's window shopping made easy, without the hassle.

"I used H&F exteriors to install windows in a 130 year-old historic property. The old windows were crusty and inefficient. The new windows are great, and have cut the heating and cooling bills in half. H&F and their team were terrific to work with, honest and responsive."