Full-Service Home Improvement Contractor

Mark’s Windows & Doors in St. Catharines, ON performs home improvement services to clients across the Niagara region. We specialize in the installation and repair of windows, doors, sheds, and other structures.

Residential Window and Door Installations

Our owner, Mark Britnell, has been installing windows, doors, decks, and siding for more than 25 years. Mark worked as a subcontractor early in his career, working on high-end, luxury windows, as well as porches and decks. After many years of experience, he decided to establish Mark’s Windows & Doors.

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Our Specializations

  • Windows and doors
  • Fences
  • Sheds
  • Siding
  • Deck
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Why Choose Us

  1. Five-year minimum warranty on all services
  2. Free, no-obligation quotes
  3. Experienced and knowledgeable owner
  4. Willing to work with other suppliers upon request
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Exceptional Quality of Products

Mark’s Windows & Doors carries products that are manufactured by some of the most trusted and respected names in the home improvement industry. We have items from Royal Windows and DoorsKaycan, and Ostaco. The products that we have in our inventory include vinyl siding, doors, and windows.

Client Satisfaction

Total client satisfaction has always been our utmost priority. Mark has seen many instances throughout his career wherein the window installer or manufacturer would deliver mediocre services or products. That is exactly why he established his own company with a vision of delivering nothing less than excellent workmanship.

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