We have been serving the Mooresville, NC area for 43 years.

At Windows & Doors By Design, we are a family-owned business, and we take great pride in offering excellent service to each of our clients. We have been in the construction & remodeling industry for more than three decades, which has provided our staff with plenty of experience. As a result, you can count on our team to provide a great experience with any job you need done at your home or business. We offer a variety of contracting services, including window replacement / installation, siding, gutters, doors, and more. We also offer construction of sunrooms, screen rooms, enclosed porches, and other enclosures.

Heather Sumrow is the proud owner of Windows and Doors By Design. Her journey in the industry began in 2003 at G&S Contracting, Inc., where she worked alongside her father-in-law, George Sumrow, and her late husband, Randy Sumrow. With more than 22 years of hands-on experience in exterior remodeling, Heather has developed a deep passion and expertise in windows and doors.

While she continues to offer siding, gutters, and enclosures, Heather has chosen to focus her company’s direction on windows and doors—the area she loves most. Over the years, she has toured countless manufacturing facilities, partnered with top brands, and carefully selected the products she offers today. Each brand reflects not only her own 22 years of experience, but also the wisdom and insight of her father-in-law’s 45 years in the industry.

Heather’s dedication is simple: to provide homeowners with the highest quality products and exceptional service, backed by decades of family knowledge and craftsmanship.

Our previous clients often share their positive experiences with the team, and we also have an A+ rating with the Better Business Bureau and are members of the local chambers. Each of our team members is very reliable, so they will show up when they schedule a time to come to your home. Whether you are calling for a consultation or to schedule the job, we will make sure to provide you with excellent customer service and can answer any questions you might have along the way. We use the highest quality products when it comes to siding, gutters, windows and other materials to make sure you are satisfied with the completed project.

"I was totally impressed with this company.”

“We replaced the glass in 9 of our windows about a month ago. Gas had escaped and they were all foggy. I was totally impressed with this company. They were not the lowest bid, but they were not the highest bid either. I had been shopping around for replacement glass for about a year. Everyone wanted to replace the windows and not the glass. The coupon on their website made it even more affordable. The workers were very pleasant, efficient and timely. Since that time I have recommended their services to a couple of my friends. Thank you for a job well done!”

★★★★★ 25^thOctober 2024 –Jane G.

Your Vision, Our Commitment — Contact us today for your free consultation.

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Services We Offer

Home Windows

Windows can make your home more efficient and enhance your home’s aesthetics.

Doors

Our doors are available in smooth steel, stainable steel, and fiberglass, with a wide variety of clear and decorative glass styles.

Siding

We offer siding that is manufactured with proprietary designs and ingredients to deliver greater durability, rigidity and wind resistance.

Your Vision, Our Commitment — Contact us today for your free consultation.

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Our service area includes properties throughout the Lake Norman area, including Mooresville, Troutman, Statesville, Cornelius, Huntersville, Sherrills Ford, and Terrell, North Carolina. Our staff members are available from 9 a.m. to 5 p.m., Monday through Friday, and we also offer some availability on Saturdays to help accommodate your busy schedule. Contact us today to schedule your consultation!

Why Choose Windows & Doors By Design?

Working with us is easy! We’re dedicated to making sure each interaction with our team is productive and positive. We’ve been in business since 1980. When you turn to us for home improvement solutions, you’re partnering with contractors who know what they’re doing! We’ve tried and tested the products we recommend, ensuring we’re only providing the highest-quality windows, doors, siding, and gutter protection solutions.

See what some of our satisfied clients are saying about us.

Shay Noone

I had 17 windows replaced and it was totally painless. They were polite, professional, worked quickly, and were reasonably priced. They also did a great job cleaning up after themselves. I am planning to contract them again for future work on the house.

gima taylor

We recently had our windows and siding replaced, and we couldn’t be happier with the results. From start to finish, Heather (Owner) and Tom (Project Manager) were professional, responsive, and easy to work with. The workmanship is excellent—everything was installed with great attention to detail, and the final result has completely transformed the look of our home. The crew showed up on time, kept the work area clean, and clearly took pride in their work. We would absolutely recommend them to anyone considering window or siding work.

Mary Ann Freeze

So glad we worked with a local company. Very professional and we are very happy with our new windows. Would highly recommend them.

michael wiggins

Had windows installed on 10/14/25, they arrived at the time they said. Had all windows replaced they did a very good job,and cleaned up after finishing. Would use them again very good job.

Chrissy Turner

I recently hired Window & Doors By Design for a major remodeling project in my home including window replacement, door replacement, gutters and siding and I couldn't be happier with the results! From the initial consultation with the owner Heather Sumrow to the final walkthrough, the team was incredibly professional and attentive to my needs.The design suggestions they provided were both creative and practical, perfectly aligning with my vision. They kept me informed throughout the entire process, ensuring there were no surprises. The workmanship was top-notch, and the attention to detail truly set them apart.If you're looking for a reliable and skilled remodeling company, I highly recommend Window & Doors By Design.

Kristal Leatherman

I cannot emphasize enough how much I would DEFINITELY RECOMMEND G&S contracting!! George is the main owner and founder and he works with his son. He came out personally to assess my windows in South Charlotte (he came down from Mooresville). I spoke with him and a couple others on the phone as well and everyone at this family-run business is prompt and professional. I was kept up to date on things in terms of when the windows would arrive, when they could be installed, etc. The man that actually installed my 10 windows is an employee of G &S that services my area. I think his name is Flavio and he, too, was phenomenal. He arrived on time, was neat and organized, and cleaned up after himself in and outside of my home. He was also friendly, courteous, and did a superb job...AND he completed everything in just 2- 1/2 days. So he wasn't wasting time and goofing off, he was putting in a full day's work. And the icing on the cake is that their pricing was the best that I found for a quality product. I wish every business conducted themselves with the integrity that G &S does!

Randall Smith

3/23/23 G&S Contracting installed our 5,south facing, custom ordered windows made by Sunrise brand with solar package.They were all great to deal with. The installer did a very good, nice neat job in a short time. The windows are such an improvement, keeping cold and heat out. Keeping cool air or heated air in. Our house is now more comfortable in every room at any time.We will use G & S again! We strongly recommend them and Sunrise windows.

Alexandra McClarnon

We had all of our windows replaced with G&S. Reasonably priced, quick install, great communication, and wonderful customer service. George was a pleasure to work with and Flavio did an amazing job on the install. Highly recommend!!

Yvonne Hoehn

We have done business with G&S for over 20 years. Over those years they provided window replacements, front entry door replacement, screened in porch, sliding glass door, and storm door replacement. All work was professionally done and we have been very satisfied with the products. Now after all these years we have had some product lifetime warranty claims and George has always responded to assist us in these product warranty claims. Thanks. It’s been a pleasure doing business with G&S.

Jennifer Dabiero

Just spoke to a man on the phone- he could not repair my problem- but was more than happy to get me in touch with someone that could! I will be calling them back if I need- or passing along the number to anyone I know needing- doors or windows. I appreciate the customer service even for a non customer.

Debra McClure

Israel Grigg

I would like to highly recommend G&S Contracting, inc. to anyone who is looking to install new windows. We had new windows installed in our home last month. G&S was able to start the project a day earlier because they finished a prior job before expected. They were able to begin the process late one afternoon and then finish up early the next morning. This kept me from having to miss a day a work, which was much appreciated. They did a great job and we love our new windows. We also found their pricing to be very reasonable when compared to other companies. Thank you, G&S! We will definitely consider using your services again!Israel Grigg, Mooresville, NC