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Helpful And Friendly Installers 

We replaced all our windows, the front door and garage doors. During the selection and decision making process the TrueSeal team was extremely helpful. Deb took the time to understand our vision as well as offer very helpful options and suggestions. The installers were friendly, very knowledgeable, and did a very professional install (including the attention to detail on the finishing work). We are very happy with the end results and would recommend TrueSeal to family and friends without hesitation.

- Dan on HomeStars

Brian baeumler approved

We offer a 5-year, no fine print warranty on labour, and a lifetime warranty on most of our products.

Customer Satisfaction Is Our Priority

Click for the BBB Business Review of this Windows & Doors - Installation & Service in Brampton ON
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Our family is proud to have built a reputation as a well, co-ordinated team, known for its knowledgeable members, and unique expertise shared by each new generation.


Proudly serving you since 1968, our family trademark is our commitment to excellent work every day.

Offering An Extensive Line of Windows and Doors in Brampton and Beyond


An Extensive Line of Windows and Doors

At TrueSeal Window & Door Systems, we believe doors and windows have more than one role to play. They can give an aesthetic appeal to a room, boost the resale value of your property, and provide ventilation and sound insulation for your property. Reach out to us to get an estimate for windows and doors in Brampton and the surrounding areas.

We Are Family

Our History

There has been incredible progress in the quality of products available over the years! We are very proud of our crews’ workmanship and integrity, which allow us to boast “We are the bay and bow window specialists!” Our personal touch, along with superior Canadian-made products, has earned us a solid and steadfast reputation over the past five decades.

An Extensive Line

We Are Family

Len Cook started installing for his father, Bart Cook, back in the 60's and branched off on his own in 1968. We’ve been in business for 51 years, and are family owned and operated. Not only will our products keep stray animals and other unwanted guests out, but our doors and windows also ensure that you are perfectly safe, secure and cozy.

Brampton and Beyond

We Service Brampton and Beyond

Hire a professional who will help you pick the right kind of doors and windows in terms of material, size, type and design. Update your existing windows and doors with brand new styles and features at TrueSeal Window & Door Systems. You can count on our lifetime, non-prorated, transferable warranty. Share your vision with us.

Not Just a Word to Us

Professionalism – Not Just a Word to Us

Our installers take a methodical and meticulous approach to the placement of doors and windows, their dimensions, type and design, and materials used in their construction. Most importantly, we understand that like other architectural elements, doors and windows must blend in with the overall style of the building.

Quality Workmanship

Starting a new build? Planning a home renovation? Trueseal Window Door Systems is here to help you with our dedicated, expert service. We proudly stand behind the quality of the product and installation services.

We’ve received the Brampton Guardian Readers’ Choice Awards seven years running.


Job Well Done

“Thank you for a job well done and be assured that we would not hesitate to recommend your company to anyone looking to have their windows replaced.”

- Anne-Marie P.

Specializing in Home Renovations, Windows and Doors

Offering a “no fine print” 5-year warranty on labour and a lifetime warranty for our products, TrueSeal Window & Door Systems features competitive pricing, dedicated customer service and an “under promise, over deliver” attitude.


We like to appeal to the traditional tastes while offering the latest edge products as well. To learn more about our exterior décor options, book a consultation in Brampton and the surrounding areas. We offer no pressure consultations and deal with our customers in a knowledgeable and professional manner.


You can also check us out on Facebook.

True Seal works with Snap Financial to help their clients with reasonable and reliable financing.

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