Windows and Doors Contractor Newmarket

When the time comes to replace your windows and doors and search for a trusted company in Newmarket, we know that you want to feel confident in your decision, and assured about the quality of your products.


This is why at Simpson Windows and Doors we only work with the best manufacturers in the industry to bring you the latest in energy efficient products, quality installations, and lifetime warranties.


We offer a full line of exterior home improvement products at competitive prices, including:

  • Installation of new windows
  • Replacement of existing glass with a variety of glass options
  • Installation and replacement of customized doors for patios and gardens
  • Full removal of frames
  • Updates to shutters and window coverings
  • New siding for doors
  • Eavestroughs and siding
  • Soffit and facia

We’re proud that our years of experience, top-quality workmanship, honest customer service, and superior products have made us a BBB Accredited Business with a rating of an A-.

We operate with integrity; offering no-obligation quotes, warranties, and superior after-sale quality control and service to ensure that you are satisfied with your new windows and doors for years to come.

Why Choose Us?

We have been operating in Newmarket for over 25 years, and have established ourselves as a preferred contractor in the area.

Qualified and Fully Insured Staff

All of our contractors are fully qualified; we employ some of the best in the industry. Our staff is always up to date on the latest technologies to ensure we are always offering the highest quality windows and doors solutions to fit your needs. All of our technicians are fully insured for liability as well as WSIB (Workplace Safety and Insurance Board) for your protection.

Highly Regarded Manufacturers

We are your reliable source for the purchase and installation of top-rated products from the most trusted and respected manufacturers in the industry. We pride ourselves on providing you with products that will stand the test of time.

Energy Star Rating

Every single product sold and installed by Simpson Windows and Doors is Energy Star Rated. Energy Star is a U.S. Environmental Protection Agency (EPA) voluntary program that helps businesses and individuals save money and protect our climate through superior energy efficiency.

Energy Efficiency

Our products are made of heat-resistant glass that sits between two low-energy glass panes. They work to prevent heat from leaking through the edges of your windows and doors, which helps to reduce your overall energy costs. The glass we use is backed by proprietary glass and air sealing technology, which provides unmatched air infiltration protection and cuts drafts; offering a mold-resistant seal guaranteed for life.

Lifetime Warranty on Greenview Products

We offer a lifetime manufacturer warranty on all our products that is non-prorated and can be transferred at no cost. It covers accidental breakage, seal failure, and hardware issues so that you can purchase with confidence.

With 25+ Years of Experience, We Have Seen it All!

From poor insulation to structural aging and mold – there are a variety of reasons your windows and doors might need replacing. We have experience in replacements and installations no matter the condition you are currently facing, and we pride ourselves on providing the best solution for your specific needs.

There are no projects too big, too small, or too complicated.

Past Projects Completed in Newmarket

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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