About Us

Based in Markham, we proudly serve customers across the GTA.

Quality Products with Proven Performance

Why Choose General Windoor?

Vinyl & Aluminum Experts

Specialized in high-quality window systems

Trusted Local Materials

Window City vinyl & premium aluminum

Since 2013 Experience

Reliable installation across GTA

Our Approach

We focus on new installation only and do not provide repair services, allowing us to maintain higher standards in workmanship and long-term performance.

With over a decade of experience, we ensure every project is completed with attention to detail, proper installation, and a clean finish.

Experienced Window & Door Installation Since 2013

Founded in 2013, we have built our business on quality workmanship, practical experience, and reliable service.

For many years, we have been serving clients in Markham and across the Greater Toronto Area, providing professional installation of new windows and doors for both residential and new construction projects.

Our Specialization

We focus on two main window systems:

  • Vinyl Windows – ideal for replacement projects and everyday residential use

  • Aluminum Windows – ideal for new construction, large openings, and modern architectural design

For our vinyl windows, we use trusted locally manufactured products from:
👉 https://windowcity.com

We work with preium aluminum curtain wall system.
for reference;
👉www.alumicor.com

Doors We Install

In addition to windows, we also install:

  • Sliding Doors

  • Lift & Slide Doors

  • Entry Doors

Ready to Install New Windows or Doors?

Contact us today for a quote on your vinyl windows, aluminum windows, or new door installation project in Markham and the GTA.

Free Estimate