The Best Windows & Doors in Cornwall

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The Best Windows & Doors in Cornwall

Andre Tessier, Service Representatives - Clera Windows & Doors

Andre Tessier

Our local representative who has been serving Cornwall and surrounding areas for 25 years!


Contact us for more information and about a free quote!

Contact Us

Our Local Clera Branch Serves Cornwall

As the manufacturers and installers of all our windows and doors, we stand behind our work.

Andre Tessier, Service Representatives - Clera Windows & Doors

Andre Tessier

Our local representative who has been serving Cornwall and surrounding areas for 25 years!


Contact us for more information and about a free quote!

Contact Us

Our Local Clera Branch Serves Cornwall

As the manufacturers and installers of all our windows and doors, we stand behind our work.

Clera Windows + Doors

Cornwall and Surrounding Areas

Toll Free: 1-844-738-7936
Phone: 1-844-738-7936
Fax: 905-738-0586


Clera Windows + Doors

Toll Free: 1-905-738-1870
Phone: 1-905-738-1870
Fax: 905-738-0586


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Best Windows And Doors - Clera Windows + Doors

Get over

$325 per Window

in FREE factory upgrades

With our wide range of ENERGY STAR products, you can be sure to save big on your next dream project!

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Limited Time Offer To Upgrade Your Home - Clera Windows + Doors

The Best Windows & Doors in Cornwall

Besides getting a new look and complementing your home, installing new windows and doors is a long term investment that will protect your house from extreme weather conditions, as well as provide savings on your energy bills and increasing its resale value. Clera Windows & Doors will help you find the right type of windows and doors in Cornwall, catered to meet your home’s needs and ensuring products of the highest quality, as well as a great customer experience.

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Clera has been in business since 1978. With quality services, affordable rates, and peerless customer service, we have achieved tremendous growth in the field. We have earned a strong reputation in Cornwall by offering a comprehensive range of custom shapes, colors, styles and sizes of doors and windows. We offer the construction of new fixtures, as well as the renovation and replacement of faulty and outdated doors and windows among our services.

We offer a wide range of windows including double-hung replacement windows, end vent slider, casement windows, sliding windows, bay & bow windows, low profile fixed, high profile fixed, awning windows, specialty windows, and picture window styles.

Customized Windows & Doors In Alliston - Clera Windows + Doors
Invest In Your Home Today - Clera Windows + Doors

At Clera Windows & Doors, we have a significant inventory of finished windows and doors and can fabricate a wide range of custom styles and colors. Clera is a premier manufacturer in Ontario and we have been recognized as the top pick in our product category by HomeStars. If you are looking for energy-efficient windows to reduce your heating and cooling bills or want to reduce the ongoing maintenance of your windows and doors, call on our team for some ideas. We have long served the city of Cornwall and surrounding areas and would be excited to speak with you.

Why Choose Clera

Why take a chance with other window or door companies that purchase their products from another supplier, only to resell them to you for a higher cost?

Clera Windows + Doors is one of Canada’s largest, oldest, most dependable and reputable vinyl window manufacturers in Ontario. We fully manage and take care of your door and window replacement project from start to finish, ensuring every stage of your window or door project meets our lofty standards of craftsmanship.

Why are we Ontario’s most awarded window and door company?

The Clera Care Guarantee Logo

Over 45 Years of Experience

With over 45 years of experience, we have earned a reputation as one of Canada's leading window and door manufacturers and installers.

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Certified Technicians

You can trust our team of factory trained technicians to install your new windows perfectly—our A+ BBB rating is no accident!

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Serving Ontario With over 40 Branches

We have over 40 branches across Ontario, which means that we're always close by when you need us.

Non-prorated Lifetime Warranty Icon

Non-prorated Lifetime Warranty

Whenever anything goes wrong with your windows, we'll take care of it for you—no questions asked.

Energy Star Icon

ENERGY STAR® Certified

Our hung windows meet Canada's strict energy-efficiency standards. A window from Clera is not only high-quality and durable, but also energy-efficient.

Reasons to Love
our Products

Clera Windows + Doors is a reputable vinyl window manufacturer in Ontario with a history of dependable and high-quality products. Our superior materials and cutting-edge technology ensure durability, energy efficiency, and style. We offer customizable styles and colors, as well as superior security features and noise reduction technology to provide the best possible product attributes for your home.

Our team manages every stage of your replacement project, from start to finish. We work closely with you to understand your specific needs and preferences, and use our extensive experience and knowledge to deliver a solution that exceeds your expectations. Trust Clera Windows + Doors for exceptional service and expertise for your home renovation needs.

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Energy Star Icon

Energy Star Approved

Effortless Operation Icon

Modern, Contemporary Design with more glass, and less frame

Better Home Security Icon

Better home security

Noise Reduction Icon

A quieter home; improved noise reduction from the outdoors

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No Maintenance Icon

No maintenance: vinyl windows are virtually maintenance-free

Pilkington Low-e Glass Technology Icon

Pilkington Low-E Glass Technology, engineered specifically for Canadian climates

Structural Integrity Icon

Wet-glazed frames and sashes on all windows; the ultimate in protection against water and wind infiltration, with added structural integrity

Improved Ventilation Icon

Triple-fin weatherstripping with built-in anti-microbial properties, meaning no mould and better air quality

Pure Virgin UPVC Icon

100% pure virgin UPVC, providing protection from fading

Exceptional Durability Icon

Stronger hardware and structural integrity thanks to integrating galvanized steel (allows for larger, more spectacular views!)

Cornwall’s Leading Replacement Windows & Doors

A home is one of the largest investments a family makes. We view it as our responsibility as a company to help our customers protect this investment and increase its value. Clera commits to provide the right guidance on design ideas, material, or options as well as cost estimation of the project. We help you visualize the best impact windows and doors for your home before purchase. We use high-quality materials of renowned brands that exceed the expectations of our customers and establish a long-lasting relationship.

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Window & Door Assemblers - Clera Windows + Doors
Best Vinyl‍ End Vent Slider Windows  - Clera Windows + Doors

Our belief is that by providing quality services to our customers, we can win their trust. That’s why we strive to offer prompt service and speedy delivery times. Our customers are also able to get in touch with us 24/7 for a quick response to any window and door warranty situations or issues.

We have also won a bunch of industry awards and certificates, making us Ontario’s most awarded window company. Our experienced technicians will take the necessary measurements and then professionally install the windows and doors into their exact openings, making sure they are properly fitted. When all the work is done, our technicians and staff will walk you through a product demonstration and provide you with tips on the operation, care, and maintenance of the newly installed windows or doors in Cornwall. We are also available to provide post-installation services if any issues may arise, such as patio door adjustments or window maintenance questions.

At Clare, we also offer free, in-home consultation to you with no obligation. Our replacement window and door specialists and staff will listen to all of your needs and provide you with the design and styles that would suit your home in Cornwall. We’re careful to take care of our environment. We are committed to making windows and doors in Cornwall that meet the strict technical requirements of ENERGYSTAR, resulting in big energy savings, as well as helping you to stay cool in the summer and warm in the winter.

With over 40 installation and sales branches spread across Ontario, so far we have provided services to 250,000+ homes and dedicated to serving more homes in upcoming years.

Vinyl Windows & Doors - Clera Windows + Doors
Bay & Bow Windows - Clera Windows + Doors

Vinyl Windows & Doors

Over the past few years, vinyl has become the material of choice for replacement windows and doors as well as for new installation. Vinyl is also energy efficient, and has emerged as the top performer in Cornwall as well as in almost every other locale. Vinyl doors in Cornwall are remarkably durable, inexpensive, and extremely energy efficient, which promises good value for money. At Clera Windows & Doors, we strive to make vinyl windows that are virtually maintenance-free, requiring only simple cleaning steps which makes it look new and shiny. We are proud to carry a large range of remarkably high-quality vinyl windows available in a variety of styles and colors.

With the industry’s best warranties and remarkable energy efficiencies, Clare makes the best customized vinyl windows and patio doors in Cornwall. At our location in the area, we have an extensive assortment of vinyl windows to choose from. Every one of our windows can be customized with plenty of style options and our inventory is stocked with a variety of ready-to-go styles featuring Low-E Glass. The lifetime warranty that we offer with our products as well as our factory-trained, professional installation make Clera the number one choice for replacement windows and doors in the Cornwall area.

All of our windows are backed by a comprehensive warranty. You are protected with our full warranty when you choose Clare Vinyl windows. All vinyl parts are sold with a lifetime guarantee and you’ll never have to pay for a new part again!

Extensive Range Of Vinyl Windows - Clera Windows + Doors
Serving Aylmer For Over 40 Years - Clera Windows + Doors

Serving Cornwall For Over 40 Years

With over 40 sales and installation centers in Ontario, we have been serving the residents of Cornwall for over 40 years now. We offer a local, personalized experience to make the window purchase experience easy in Cornwall. When a client put trust in us for handling the window and door needs of their house, we take responsibility for the successful completion of that vision. From planning to execution and post-service inquiries, our goal is to meet customer satisfaction.

Did you know that Clera’s products are featured in over 200,000 homes? There is little wonder why we are the leading door manufacturer in Ontario with our huge selection of pre-made and custom security doors, sliding doors, and French doors in Cornwall. Add security and beauty to your home or office by speaking to one of our expert staff today!

Meet The Team at Clera Windows & Doors, Cornwall

We have an experienced, licensed, and dedicated team of technicians and installers who know how to get the job done for the very first time. When you choose us, we take installation seriously and only allow the best services that meet your needs and give your home a new stylish outlook.

All of our installers are local, which means they know every corner of Cornwall and will be there in a flash if your windows or doors ever need further maintenance. After every installation, we take our client’s feedback and deliver directly to our management team. At Clare, we never leave clients in the dark, and offer the best services no matter what—that’s what helps us to promise satisfaction for our customers who want windows and doors in Cornwall.

Professional Installers - Clera Windows + Doors
Meet The Team - Clera Windows + Doors
Best Options For Your Replacement Doors And Windows - Clera Windows + Doors