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Let us answer your questions about replacing your windows to optimize your house’s energy use.

Your Trusted Local Windows Supplier in Sudbury

It is widely acknowledged that the condition and age of your windows, doors and siding significantly impact both the value of your home and the comfort of your family. Upgrading to energy-efficient alternatives can not only benefit the environment but also result in cost savings by preventing heat loss. Additionally, this step towards sustainability can reduce your environmental footprint. Guardian Windows & Doors, a trusted windows supplier in Sudbury, can help you optimize your home. We also serve surrounding areas.



In business since 1996, Guardian Windows & Doors specializes in siding, window replacement, supplying and installing Energy Star-rated windows and doors in Sudbury and throughout the Rainbow Country area. Guardian Windows & Doors is proud to offer environmentally friendly Gentek Building Products, as well as free low-E (low-emissivity) glass coatings and argon gas fill to help seal in your window’s insulation for better performance.



We are proud to offer a range of high-quality services for homeowners looking to upgrade their windows, doors, siding, soffit, and fascia.

Our window services include installing and replacing windows in various styles and materials, including vinyl, wood, and aluminum. We can also assist with selecting the best options for energy efficiency and aesthetics.

For doors, we offer a comprehensive selection of styles and materials to fit any budget and design preference. Our installation team is skilled in all aspects of door installation, from standard entry doors to sliding patio doors and more.

Our siding services are designed to enhance your home's curb appeal and value while also providing durable protection against the elements. We offer a range of siding materials, including vinyl, wood, and fibre cement, and can assist with colour and style selection to create the look you desire.

Soffit and fascia are essential components of a well-maintained home exterior. Our team can help install and replace these elements, ensuring your home has proper ventilation and protection against moisture damage.

No matter which of our services you choose, you can count on our team of experienced professionals to deliver high-quality workmanship and exceptional customer service. Contact us to schedule a consultation and learn more about how we can help transform your home.



Home renovation is a costly, exhausting, but exciting task! It is done to achieve various goals, such as increasing property value, enhancing functionality, giving the home a stylish makeover, or adding more space. All this can be achieved if you have experienced professionals like us by your side. We are one of the trusted windows suppliers in Sudbury, known for delivering high-quality work.



Besides keeping a home well-ventilated, windows bring warmth to a place, let natural light in, and improve aesthetics. You can choose the best type of window for your home based on your requirements, space availability and budget. Following are some types of windows that you may consider adding to your home:

  • Fixed: Fixed windows are non-operational and are added to make a space look bigger, brighter and better. They are energy-efficient and much safer than their operable counterparts.
  • Awning: Awning windows open out and upward from the bottom. The best thing about them is that they keep your home well-ventilated despite bad weather conditions. Awning windows can complement any architectural style and are easy to operate and maintain.
  • Casement: Casement windows are highly energy-efficient and ideal for both big and small spaces. These windows open outward and offer better ventilation than windows with a fixed sash.
  • Single/double hung: Single-hung windows have an operable bottom sash with a fixed top sash. Whereas in double-hung windows, both sashes are operable. They are easy to operate and are best for small rooms.
  • Single/double slider: One sash is stationary in a single slider window, while the other can be moved horizontally. On the other hand, the double slider window offers more flexibility as both sashes are operable.


If you didn't enlist Guardian Windows & Doors to replace your windows and doors, you’d likely overspent! Our employment of the "Super Spacer System" can aid in minimizing sweating on the glass. Inquire with us regarding the possibility of governmental grants, which fluctuate depending on individual circumstances, as well as our senior discounts.


Dependable Suppliers – Contact Us

High-quality windows and doors are just a phone call away! Get in touch with Sudbury’s Guardian Windows & Doors. We’re a local business with over 20 years of experience in serving our area. We’re proud to be trusted by our local community and happy to provide great service for our outstanding products. Call us today and learn more about how we can help.

House & Cottage

We remove old windows and replace them with energy-efficient models just about anywhere.

More Ways to

Replacing doors, weatherstripping, and aligning thresholds can help you save on energy bills.

Increase Curb

Replace old siding with new vinyl siding that hosts many advantages to other types of siding.

Protect Your Home

Properly installed soffit and fascia can help keep out water and pests such as squirrels, birds and more.

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