East Gwillimbury’s Source for Quality Windows and Doors

If you’re a resident of the East Gwillimbury region, we know that there are a number of different window and door companies to choose from, so how do you hire the best contractor for your needs?


Whether you’re in Sharon, Holland Landing, or Mount Albert, Simpson Windows and Doors is here to offer the best in customer service and product selection from start to finish; 25+ years of experience, quality workmanship, industry leading manufacturers, and amazing care.

We provide window and doors services at competitive prices and we are proud to be able to offer a number of different design, material and style options to our clients.


Our commitment to delivering top-quality work and using only the finest materials has made us a top choice in the industry, and we continue to pride ourselves on being able to help you choose and install the right home upgrades for your specific needs.

hroughout all of out interactions from start to finish, our goal is to provide you with:

  • Fast, fair and accurate quotes
  • Modern and customizable options
  • Industry-leading manufacturer products
  • Lifetime warranties
  • Dependable scheduling
  • Careful installation
  • Responsive after-sale service

With our fully insured staff and commitment to customer service; we’re confident that Simpson Windows and Doors is the best decision for your East Gwillimbury home.

Why Should You Replace Your Windows and Doors?

Strength & Efficiency

We use Vertex3 in all of the glass products we offer; a technology that adds additional strength and energy efficiency.

All of the products we sell are also Energy Star rated, offering superior energy efficiency.

The glass we use is backed by a proprietary glass technology which provides triple-pane thermal efficiency in a double-pane window by reflecting UV rays back into the room.

Our products also come with air sealing technology which provides unmatched air infiltration protection, cutting drafts and offering a mold-resistant seal, guaranteed for life.

Ease of Maintenance

Our glass uses a solar shield and anti-dirt coating to help keep your windows and doors spotless. This coating works to prevent dirt and rain from sticking to the glass, which helps make maintenance and cleaning simple.

Improved Curb Appeal & Value

Replacing your windows and doors creates a beautiful, fresh, and “new home” appearance that can increase overall curb-appeal and the eventual re-sale value of your property when that time arrives! With a variety of options for you to choose from, we’ve got you covered.

Protect Your Family’s Safety

With an honest evaluation and fair service quote, our trained experts are here to help you protect your family from the outside elements, and any emergency situations.

Past Projects Completed in East Gwillimbury

Past Projects
Past Projects


Professional Job and Cleanup

"Well our job is all finished. I want to thank everyone for such a professional job and cleanup. Adam, Justin and Paul were amazing and finished the eavestroughing and window installation without a hitch. Thanks to Adam for pointing out that the colour we had chosen was not the best match. He ordered the better choice and it was here on the job before they actually needed it. Thank you for not letting me put up the WRONG colour Adam."

Brands We Carry

Dorplex Logo
Greenview Logo
Kaycan Logo

Speak to one of our professionals today to schedule your free assessment and get your project going!

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