Window and Door Replacements in Markham

When it comes to choosing a windows and doors contractor in Markham, we know that the decision can be difficult. With our fully-insured staff, Energy Star rated products, and Lifetime Warranty on Greenview Products; we’re confident that Simpson Windows and Doors is the best decision for your home.


Not all contractors are created equal, and we’re proud that our years of experience, top-quality workmanship, honest customer service, and superior products have allowed up to delivery the highest standard of service.

All of our window and doors products come with a lifetime manufacturer’s warranty that covers glass breakage, seals, and all hardware. Our warranty is transferable at no cost, and is non-prorated.


If you plan to sell your home at any point, our windows and doors’ beauty, durability and energy efficiency will help to increase your property’s value, allowing you to sell at a higher price.

Our Windows and Doors Services

When you hire a contractor, you want to feel assured about the skill and trustworthiness of their abilities. At Simpson Windows and Doors, we pair certified employees with transparent business practices to ensure you receive quality work.

We always promise:

  • Dependable scheduling
  • Careful installation
  • Manufacturer’s Lifetime Warranty on Greenview Products
  • Responsive after-sale service

We offer a number of different window and door types with an extensive number of configuration and material choices including glass, wood, vinyl, steel, and fibreglass. We also provide additional services to further enhance the integrity of your home’s exterior.

Types of Windows Offered

  • Bay & bow windows
  • Casement
  • Double hung
  • Single hung
  • Single slider

Types of Doors Offered

  • Entrance/ exterior doors
  • Storm doors
  • Patio doors
  • Garden doors
  • Wrought-iron

Additional Services Offered

  • Eavestrough
  • Siding
  • Soffit & Facia

Trust the Professionals

Enhance your home’s atmosphere! When you install new windows and doors, you improve your home’s safety and protection, natural lighting, and energy efficiency. New windows and doors also update your home’s aesthetics, giving it added curb appeal and value. Trust our trained technicians to help you weigh your options.

Past Projects Completed in Markham

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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