The Best Windows & Doors in St. Mary’s

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The Best Windows & Doors in St. Mary’s

Barry & Laura Jacklin, Service Representatives - Clera Windows & Doors

Barry & Laura Jacklin

Our local representatives have been serving St. Marys and surrounding areas for over 20 years!


Contact us for more information and about a free quote!

Contact Us

Our Local Clera Branch Serves St. Marys

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

Barry & Laura Jacklin, Service Representatives - Clera Windows & Doors

Barry & Laura Jacklin

Our local representatives have been serving St. Marys and surrounding areas for over 20 years!


Contact us for more information and about a free quote!

Contact Us

Our Local Clera Branch Serves St. Marys

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

Clera Windows + Doors

St. Marys

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 St. Mary’s

Clera has been making quality joinery for the residents and businesses of St. Mary’s for nearly 40 years. Established in 1978, we have scores of happy and satisfied customers across the community in both domestic and commercial properties. Replacement windows and doors in St. Mary’s are our specialty and we are renowned for our quality merchandise and superior customer service which focuses totally on what the customer requires.

We make to measure all of our windows and doors in St. Mary’s at our own factory located in Ontario, allowing us to focus totally on what each customer wants and being able to deliver according to their exact specification. Our personalised service is the envy of our competitors and allows us to provide a product and price which cannot be beaten. Because we can control costs at Clera, we are able to offer keen pricing without cutting corners. All of Clera’s products come with a lifetime warranty for all component elements so you can relax, safe in the knowledge that any repair or replacement part will be covered free of charge forever.

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We offer a range of window styles in St. Mary’s, including single/double hung tilt, single/double slider tilt, awning, end vent slider, casement, and specialty shapes. Our vinyl windows are engineered with Envirosealed glass so you are guaranteed optimum energy performance from summer to winter. That way you can dedicate your savings on heating and cooling costs to other matters.

Our windows are also easy to clean and provide superior privacy and security, keeping your home well insulated from outside noise. Moreover, we offer many grill options and customizable colour options, so you won’t have to worry about repainting, except when you want to change their colour.

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

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.

Certified Technicians Icon

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!)

St. Mary’s Leading Replacement Windows & Doors

Making your replacement windows and doors in St. Mary’s to order means that you can tailor the finished product to your exact requirements. Our experienced team can guide you through the design process. We offer a tremendous range of styles to choose from and pride ourselves on our flexibility and versatility. We have many satisfied customers throughout St. Mary’s who will bear testament to the quality of both our service and products.

We are proud to state that the residents of St. Mary’s, Ontario have trusted Clera Windows and Doors to protect their homes for nearly four decades. Our dedication to superior quality manufacturing and installation, coupled with exceptional customer service make us a favourite for St. Mary’s residents looking to improve the energy efficiency, comfort, and curb appeal of their homes with our replacement doors and windows.

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

Clera’s replacement windows and doors in St. Mary’s will transform your home. Expect an increase in value after they have been fitted. Low maintenance and easy to care for, your new windows and doors will stay looking good for years with the minimum of effort. The latest engineering technology at our factory in Ontario will guarantee a premium fit endorsing great energy saving for you and your bank balance.

Feel safe and secure with your new Clera joinery. Enjoy privacy and quieter living space away from the hustle and bustle of modern life.
Choose from Clera’s comprehensive range of glass, grilles and colour options. If the colour you want isn’t there then we can make it for you. Our unique colour retention technology means whichever shade you opt for, your new windows and doors in St. Mary’s will not fade whatever the Canadian winter throws at them. Browse our infinite range of styles, we are sure you will find something just right for your home.

Why not try the design tool on the Clera website which allows you to play around with different styles and colours in an easy to follow a three-stage process. Take time choosing what is right for your St. Mary’s home. Our range of doors covers everything a householder might be looking for and are offered in either fibreglass or stainless steel. Enjoy all the benefits of new handmade windows and doors, take control of all the design with Clera.

Vinyl Windows & Doors

Vinyl is the new wood and Clera reckon it is the ultimate choice for making replacement windows and doors and after nearly 40 years in the business, we should know!
Vinyl might be a surprising choice but it is exceptionally durable and robust, a real requirement in Canadian winters. It is surprisingly lightweight in use and available in a range of thicknesses which allows us to craft the exact products that you are looking for. Vinyl is easy to care for and maintains an exterior sheen and finish even after many years so your windows and doors in St. Mary’s will always look good. It is very competitively priced and we think it beats wood hands down. Vinyl will insulate your home effectively due to its high R-value status. Keep the heat where it belongs – in your home. And avoid the heat in your wallet, you will be amazed at our prices.

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

Windows and entry doors are part of your home’s envelope, forming a barrier between your cozy living space and the outside environment. So, when your doors and windows are not in top condition with regard to energy efficiency, your home’s energy performance suffers, your pockets get drained, and the occupants persevere in discomfort.

Unlike energy-saving improvements for drafty doors and windows, the professional installation of replacement doors and windows in St. Mary’s improves your home’s energy performance, as well as its visual appeal and value.

Clera fits and installs in accordance with the specifications set out by the Canadian Standards Association. Our fitters are top quality, experienced and professional and we aim to install with the minimum of mess and disruption to your home. Follow the whole process through from design to manufacture to fitting, let Clera handle all of it with our experienced team.

Serving St. Mary’s For Over 40 Years

Clera is both known and loved in St. Mary’s—we have been around a long time and there are plenty of examples of our work to see in the community. We are very proud of our exceptional reputation won by hard work and quality goods. Our focus is putting the customer first which, when combined with our high-end replacement windows and doors, makes for a winning combination.

Clera Windows and Doors’ technicians in St. Mary will help you identify the ideal replacement doors and windows for your home. Our design options are fully customizable to meet the exact needs of your home; plus, our skilled installers are conversant with industry standards, meaning that all the work is superbly done to leave you satisfied with your investment.

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

Clera has retained the family feel and ethos which was there right at the outset in 1978. This is a tradition that we want to build on and celebrate. We continue the proud Clera tradition in St. Mary’s of top quality windows and doors backed with great service and a lifetime’s warranty.

Relax and watch the winter weather through your new windows, secure in the knowledge that they have all been inspected and tested before they were allowed to leave the factory. Your energy bills will tumble as our super energy-efficient insulation gets to work ensuring a warm ambient temperature throughout your home. All Clera products are Energy Star Certified.

Our contemporary vinyl, fibreglass, and steel doors ensure that you and your family leave and enter your house in style. Our doors are manufactured in-house, which is an important step for ensuring quality construction and bringing costs down for our St. Mary’s clients.

Additionally, all our customers are issued with a full, written factory lifetime warranty after the completion of their installation. Our warranty is transferable, so you can have peace of mind knowing that every occupant will keep enjoying the superior service offered by Clera Windows and Doors.

Meet The Team At Clera Windows & Doors St. Mary’s

Clera is the name at the top of most people’s list in St. Mary’s and with good reason. Our track record speaks volumes. Choose a company which puts customer satisfaction and quality of product before profit. Compare our prices to those of our competitors and see just how well they stack up. All Clera products are lovingly handmade in our Ontario warehouse.
Clera Windows and Doors has built a solid reputation, not only in St. Mary’s, but also across Canada. In fact, we are among the top manufacturers and installers of replacement doors and windows in Canada.

Professional Installers - Clera Windows + Doors
Meet The Team - Clera Windows + Doors

Our decades of experience in the industry make it possible to consistently provide homeowners in St. Mary’s with the highest quality and greatest range of vinyl window and door styles to best meet their unique needs.

Whatever style of replacement doors and windows you need, Clera has exactly what you need, plus the installation will be backed by an unmatched, lifetime warranty.

Contact Clera Windows and Doors in St. Mary’s today to get a free estimate for your replacement doors and windows.

Best Options For Your Replacement Doors And Windows - Clera Windows + Doors