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Cornerstone Home Improvement Cornerstone is a Kansas City window company, entry door replacement company and vinyl siding installer. If you live in the Kansas City area, you may have noticed a trend. Big manufacturers want to sell you one replacement window, their window. They tell you why it's better, more energy efficient, made of the best materials, and tout all of their features.

But how do you know if it's the best window for you? At Cornerstone, we approach it a little differently. We carry dozens of brands of windows (and doors and siding too) and we can tell you the advantages of every single brand from a non-biased viewpoint.
Business details
  • Year established: 1997
Services
Vinyl Siding
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We offer only top of the line, premium siding products at prices to fit any homeowner's budget. Our siding products carry full manufacturer warranties, are thicker and stronger than the industry average, and we warranty the labor.
Entry Door
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Kansas City entry door, storm door, sliding door installation and more from Cornerstone Home Improvement. You never get a second chance to make a good first impression. Our beautiful premium entry door systems will always greet your guests with classic elegance and style.
Replacement
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Kansas City Area Window Replacement - at Cornerstone we offer top-quality, premium double paned, triple paned, or heat mirror thermal windows at an affordable price. From vinyl to fiberglass to custom hard wood wooden windows, Cornerstone is equipped to meet any homeowner's specific energy and design needs. We work with reputable high quality manufacturers.
Installation
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At Cornerstone, installation is our lifeblood. We started as an installation company over 40 years ago. For years we installed windows, doors & siding for the biggest companies in Kansas City. Many of these companies are our competitors today. By seeing this side of the business for so many different companies for so many years, we got a great education.
Reviews (19)
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Andrew Ellenberg
Feb 18, 2022
I was trying to figure out a way to meaningfully impact my curb appeal with a relatively small budget. I decided that a beautiful new entry door in hot burnt orange would be the transformative light remodel that I needed. The professionals at Cornerstone Home Improvements made the whole process painless and fun! Every detail, from selecting the modern style I wanted and acing the color match at the factory, to the installation process, was handled flawlessly by this family-owned and operated business.
Tameka Jamison
Sep 09, 2021
Cornerstone is a great company to work with! Jessie was the guy who was assigned to do my windows and he was amazing. Jessie was very friendly and literally got the job done. In just a couple days I have received many compliments on my big picture window that he installed and I have to say I am so glad he was the one assigned to do my home. Thank you so much for beautifying my home, Jessie. Give Jessie three big hugs for being an AWESOME guy! Thanks, Cornerstone!
L. Bell
May 04, 2020
My neighbor had Cornerstone install some windows so I asked how she liked them. She recommended them and said they were good family company. I called and Dennis came out and gave a very good presentation of the windows they offer. We decided to order 11 windows, including a bay window, and 1 entry door. They sent out a guy to officially measure each window and door.

A few weeks later, Brenda called to let me know the windows and door were ready to install. When Brad and the crew came out they went right to work removing and putting in the new windows and door. Hard job but they knew exactly what needed to be done, cleaned up everything and even put back the window blinds. I very much appreciated they were able to get it done in one day. Windows and door look great! Very happy to recommend them.
Brian Robinett
Apr 30, 2020
We had an original picture window (41 yrs old) replaced with two double hung windows. The office staff is very friendly and kept us informed of the schedule to perform the work. Cornerstone did a very good job removing the old window and installing the new windows. The windows fit great and look great. They did the work in about two hrs and were very professional and considerate of our home during the installation.

We had received a couple of other quotes for this replacement work and Cornerstone was very competitive and I think the windows (ProVia) are very good energy rated windows. They had several selections of brick molding colors to choose from and one that matched our existing trim paint color. I would highly recommend Cornerstone for window replacement work.
Jodie Beydler
Apr 29, 2020
Cornerstone did a fantastic job on my vinyl siding. The sales person, Don, was not pushy. The installers did a great job on install and clean up. The owner and office personnel were friendly and helpful when I called to ask questions. Cornerstone was not the highest or lowest quote I received when I compared companies but I chose them because a relative was happy with the siding they installed on her home. They also use a good quality siding (Royal Woodland) and offer a better warranty on their labor than the other companies I compared.
Alex Crawford
Jun 02, 2019
From start to finish the process was very quick and easy. Don was very pleasant to meet with at our in home consult. He was professional and had a great understanding of what we wanted. He did not pressure us to buy now or give us a deadline. After we decided to go with Cornerstone, they called us to let us know the windows were in and able to install them 3 days later.

We had 10 windows to install and the crew had the old ones out and new windows placed within 5 hours. They worked efficiently and even fixed some wood rot that was found. My wife and I were extremely pleased with the Cornerstone team, and would highly recommend them to anyone needing windows.
Rich Curtis
Feb 25, 2019
We've had Conerstone replace doors and windows at two homes and couldn't be happier. They do top-notch work and make sure it's perfect before they leave. I couldn't be happier and will gladly use them for all exterior doors and windows going forward!
Bernadette Sears
Mar 27, 2018
ALL staff were pleasant and courteous. My 100 questions were answered without hesitation. The men who did the install set right to work and were quiet and cleaned up after the work. They left behind beautiful, clean, easy to open and close, non leaking window!
Jeff Long
May 09, 2017
Cornerstone's installation team was fantastic. We had 36 windows to install, plus it was snowing outside, and they still got the job done in two days. They were quick, courteous, and efficient. Absolutely no complaints. I'm only giving 4 stars because the salesman miscounted our windows, leading the total cost to increase unexpectedly when they came in for official measurements. Cornerstone's windows are quality, but they aren't the cheapest, so adding to that cost was not easy. The company was willing to work with us though, and did what they could to help keep the cost down.
Lysa Allman-Baldwin
Feb 15, 2017
I have contracted with Cornerstone Home Improvements twice for replacement of my old windows and love them! They are knowledgeable, professional, courteous, talented, timely, and have good follow through and customer service before, during and after the sale. They even come out quickly if there are any adjustments that need to be made, free of charge.

But most of all, I LOVE THEIR WINDOWS! They function perfectly, add lots of beauty to my home, and are very energy efficient. I will be using Cornerstone again for more of my home improvement projects. They are great!
Rich Huntebrinker
Feb 06, 2017
We just had 4 patio doors installed by Cornerstone Home Improvement. During the quote phase, they were very upfront and honest. Brenda was very knowledgeable about doors and provided great advice on selecting the correct door for us. The installation of the doors was top notch. They said it would take 2 days to install the doors, but were able to bring a second crew and finish in 1 day.

They clearly knew what they were doing and I have a lot of confidence in the installation. They were one of the best groups of workers we have ever had work on our house. Would highly recommend.
Hannah Johnson
Oct 10, 2016
Cornerstone has replaced the windows and front door to my house and I've been impressed every time! I can truly tell they are trying to give me a good price while still trying to provide me with the best product!
Aeriel Wilner
Jul 17, 2016
I have used Cornerstone twice since I bought my house, and have been very happy with the results both times. The staff are friendly and efficient and the quality of the work is superb. I have recommended them to friends and family, and will continue to do so!
Kenneth Sit
Mar 17, 2016
This is the fourth time we have used Cornerstone and their consistent service and quality has been very high. They are very thorough in what they do and customer satisfaction is their main drive. Their crews are knowledgeable, professional and very clean.
Linda Healy-Sienko
Feb 10, 2016
We had 2 storm doors installed. Installers very courteous and knew exactly what they were doing. Don, our salesman, can't be beat! Definitely knows his stuff. Changes to our order that we made were done correctly, efficiently and without complaint.
Ron Goldberg
Dec 22, 2015
Wow is all I can say. I just had Cornerstone come and install new Windows in our home. Not only did Allen & Thomas leave the house cleaner then when they came, but they went above and beyond. During the install my outside outlets weren't working.
Jon Willig
Nov 23, 2015
The whole replacement window process was simple and went seamlessly! From the in-home presentation of products to the installation and clean-up, it was a breeze! We had all our windows replaced and the installation only took one day.
Kimberly V.
May 19, 2015
Amazing friendly service. They did a great job with our windows. I love them. They have been perfect for two years so far. I had a handle with a screw that had come loose. NO HESITATION came right out the next day and fixed my window.
Seann Cox
May 14, 2015
Had a new front door assembly installed. The salesman Don was great and did a excellent job of walking us through all the options available. The install crew did a excellent job as well. Showed up on time and got right to work.