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3 Best Window Companies in St. Catharines, ON

Expert-recommended Top 3 Window Companies in St. Catharines, ON. All of our window companies actually undergo a rigorous 50-Point Inspection, which includes everything from checking reviews, ratings, reputation, history, complaints, satisfaction, trust and price - all to ensure overall excellence. You deserve only the best!

Great Northern Home Exteriors Inc. - St Catharines, ON Window Companies
Great Northern Home Exteriors Inc. - St Catharines, ON Window Companies
Great Northern Home Exteriors Inc. - St Catharines, ON Window Companies
St Catharines window company Great Northern Home Exteriors Inc. video
9+ YEARS ON TBR
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GREAT NORTHERN HOME EXTERIORS INC.

(5.0 Score)
21 Duke Street, Suite 107,
St. Catharines, ON L2R 5W1
Directions

Since 2009

Specialty:

✓Bow ✓Picture ✓Bay ✓Entry Doors ✓Interior ✓Single and Double Hung ✓Replacement ✓Patio ✓Tilt Sliders ✓Executive ✓Garden ✓Fixed ✓Fiberglass ✓Installation ✓Casement Windows ✓KV Windows ✓Vinylbilt Windows ✓Retro Fit Window ✓Dorplex Entry Doors ✓York Aluminum Storm Doors

"Great Northern Home Exteriors Inc. has over two decades of experience providing unparalleled sales and installation services to countless satisfied clients. The team members offer courteous customer service. The professional sales and installation teams will provide the information and guidance needed to make informed home improvement decisions and will carry out your renovations with courtesy, accuracy, and timeliness. Great Northern Home Exteriors Inc. offers several options for upgrading your windows' energy efficiency. They also maintain the Energy Star labels on your windows and doors until after your post-retrofit evaluation. They offer free in-home estimates. Great Northern Home Exteriors Inc. is a locally owned exterior renovation company serving St. Catharines and the Niagara Region

2026 Highlights: Great Northern Home Exteriors Inc. compares window styles, installation options and glass packages so you understand what makes sense for your home."

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License #725687529

Contact:

(289) 362-2644

Mon: Closed
Tue-Fri: 8am - 8pm
Sat: 10am - 5pm
Sun: 10am - 2pm

TBR® Inspection Report:

Permanent Siding & Windows - St Catharines, ON Window Companies - Service Image
Permanent Siding & Windows - St Catharines, ON Window Companies - Outdoor Work Image
Permanent Siding & Windows - St Catharines, ON Window Companies - Installation Service Image
St Catharines window company Permanent Siding & Windows video
3+ YEARS ON TBR
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PERMANENT SIDING & WINDOWS

(4.9 Score)
1475 Fifth Street Louth,
St. Catharines, ON L2R 6P9 Directions

Since 1973

Specialty:

✓Casement ✓Awning ✓Double-hung ✓Single-hung ✓Sliding ✓Bay ✓Bow ✓Tilt and Turn ✓Entry Doors ✓Patio Doors ✓Storm and Screen Doors

"Permanent Siding & Windows has 50 years of experience in the field. Their windows are designed to be used individually or in pairs, secured within a shared frame. The team also installs innovative window designs that effectively enhance energy efficiency and infuse your space with natural light. Their selection contains reputable brands and is skillfully installed by experienced professionals. They are fully insured and WSIB compliant, creating a safe work environment. Permanent Siding & Windows takes pride in its organized, professional work environment. They have installed over 10,000 windows and have thousands of happy customers. They provide estimates and financing options for new windows and siding. They also serve Niagara Falls, Grimsby, and the Greater Niagara Region.

2026 Highlights: Permanent Siding & Window installs the latest in energy-efficient window technology, saving you money and adding major curb appeal."

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Contact:

(289) 273-9910

Mon-Fri: 9am - 5pm
Sat & Sun: Closed

TBR® Inspection Report:

Mark’s Windows & Doors - St Catharines, ON Window Companies - Outdoor Work Image
Mark’s Windows & Doors - St Catharines, ON Window Companies - Service Image
Mark’s Windows & Doors - St Catharines, ON Window Companies - Field Work Image
5+ YEARS ON TBR
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MARK’S WINDOWS & DOORS

(4.9 Score)
44 Andrea Drive,
St. Catharines, ON L2S 3N8 Directions

Since 1995

Specialty:

✓Replacement ✓Full-frame ✓Sliding ✓Door Installation ✓Sheds ✓Decks

"Mark’s Windows & Doors is owned by Mark. The company has over 25 years of experience in the field. The products are manufactured by the most trusted and respected names in the home improvement industry. Their technicians combine first-class carpentry skills with excellent communication. The crew members have extensive experience and knowledge. Their employees are dedicated, reputable, skilled tradespeople with many years of experience. They meet all Energy Star guidelines in every project. The company offers a five-year minimum warranty on all services. Mark’s Windows & Doors also offers free estimates. They serve the entire Niagara Peninsula.

2026 Highlights: Mark’s Windows & Doors specialize in the installation and repair of windows, doors, sheds, and other structures."

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License #5001996

Price:

Door Installation From $3,000

Contact:

(905) 327-3971

Mon-Fri: 9am - 5pm
Sat & Sun: Closed

TBR® Inspection Report:

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GREAT NORTHERN HOME EXTERIORS INC. REVIEWS

If there were ten stars I would have given a ten star review! I can not say enough great things about this company. Punctuality, workmanship, professionalism, and customer service were all above and beyond my expectations. I had french doors put in to replace my old sliding doors and they are beautiful. I wanted something fixed and there were no issues with Clark who was one of the men who installed our doors to come out right away when asked. Everything was cleaned up nicely and installed perfectly! Clodette was really nice to talk to and the price was decent. I look forward to working with them again in the future to have windows installed. Thank you Clodette to you and your team for such exceptional service!.

We were very impressed with the work that was done installing 5 windows and 3 doors in our home, so impressed that we have gone ahead to have another door and window installed. Clodette is very knowledgeable and the people who install the windows know exactly what they are doing. You can trust this company to tell you what to expect and their price is reasonable. Highly recommended.

Great Northers was absolutely amazing from start to finish!!! We just had a new back door and some extensive work done on the install because it was a tricky project. 10/10 work and great people to work with!!

Amazing company! Clodette is an amazing owner and she is professional and caring. Had to wait for the windows but that was ok. It was cold yesterday and they were very quick in removing the older windows and installing new so the house wouldn't freeze. At least there were no wasps, right The installers were professional, friendly and very detailed with their work. Highly recommend this company. Very impressed! Price point was good too - Susan M. Reply

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PERMANENT SIDING & WINDOWS REVIEWS

Highly recommend Permanent Siding and Windows for your next home project! Darryl (owner) and his team work hard and take pride in what they do. Attention to detail and achieving the high standard they personally set, are what set them apart from their competitors. You know your job will get done thoroughly and the right way - no short cuts. Competitive pricing and amazing value for what you pay.. Permanent Siding and Windows all the way.

We had our homes’ siding, soffit, facia, eaves, and downspouts replaced by Permanent Windows and Siding and could not be happier. Amazing quality workmanship and products. Very professional attitude by the teams doing the work. I recommend this company highly. We are in Fort Erie.

The work was very good quality. We were very happy with the team and their professionalism. The work was done in a timely manner, and great value. I would highly recommend Permanent Siding and Windows.

We would certainly recommend this firm. We found their product and workmanship to be excellent and we were very pleased with every aspect of their work - Trevor C. Reply

MARK’S WINDOWS & DOORS REVIEWS

Just had windows done today (despite the less than ideal weather for him) by Mark and his crew. I was sold on using Mark's Windows and doors after the first five minutes I spent with him the day he came to give me a quote. Very professional, no-pressure, and extremely knowledgeable. I was 100% confident that he was going to deliver a good product and top notch workmanship. They were quick, cleaned up after themselves, and the windows were as promised and look great. Price was also very fair. Highly recommended!.

Called Mark to see if he could put a window in my kitchen that was being renovated. There was no existing window all he needed to know was it on siding or brick. He suggested what type of window to use and the size. He installed the window and it was amazing. We were so impressed with his work we just got him to install a front door unit with the panels and also a storm door. Did an awesome job again. Will be calling him when it is time for us to do our windows. Great job and great work and he is very personal.

Mark and Will did a great job at our house. They replaced all windows and doors that were in much needed repair and their price was fantastic! We shopped around given the full replacement needed (6 quotes) and Mark’s price was easily the best.

TBR® Inspection Score Report

GREAT NORTHERN HOME EXTERIORS INC. Total Inspection Points: 119/120
Experience: 9
Acknowledgments: 10
Business Hours: 10
Business Images: 10
Complete Info: 10
Contact Info: 10
Exact Services: 10
Legitimate Ratings: 10
Location Proximity: 10
Reviews Accuracy: 10
Website Source: 10
Website Standard: 10

TBR® Inspection Score Report

PERMANENT SIDING & WINDOWS Total Inspection Points: 118/120
Acknowledgments: 9
Complete Info: 9
Business Hours: 10
Business Images: 10
Contact Info: 10
Exact Services: 10
Experience: 10
Legitimate Ratings: 10
Location Proximity: 10
Reviews Accuracy: 10
Website Source: 10
Website Standard: 10

TBR® Inspection Score Report

MARK’S WINDOWS & DOORS Total Inspection Points: 117/120
Acknowledgments: 9
Business Hours: 9
Complete Info: 9
Business Images: 10
Contact Info: 10
Exact Services: 10
Experience: 10
Legitimate Ratings: 10
Location Proximity: 10
Reviews Accuracy: 10
Website Source: 10
Website Standard: 10

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