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Windows in Markham

Whether you have a new home in Markham, or renovation project in Thornhill, we can provide both the product and service you need. We can turn a sliding glass door into a window, turn a window into a sliding glass door, give you a door or window in a wall that doesn’t have one now, all this in addition to the standard retrofit installation.

Over 35 Years of Experience

Servicing Homeowners Across the GTA

Energy Star Rated and Designed in Canada

50% of our business is from referrals

Over 40k Satisfied Customers

Peace of Mind with Lifetime Warranty

Satisfaction 100% guaranteed

Experience & Trust Our Quality does Not cost- it Pays!

Certified Professional Installers

Best In Class Glazing Technology

Super Saver Glass with Argon or Krypton Gas Filled.

Super Saver Technology

  • Indur IG Insulating Double or Triple Glass for energy saving and solar control
  • Industry lowest failure rate! Exceptional longevity and performance
  • Lifetime Warranty with the best sound proofing and highest security against forced entry
  • Engineered thermal insulation for outstanding thermal efficiency
  • Lead free 100% virgin vinyl designed to last a lifetime and poses no health hazards
  • Energy star most efficient window, CSA certified & NAFS tested

What people are saying about us

We asked Jimmy for a white aluminum enclosure with an insulated roof on top in front of main entrance door. I am impressed with their …

Nabeel Toronto – Porch Enclosure
@joedoe

Yesterday we had a new front door installed by Welda Windows & Doors. We went from a double door to a single door with two sidelights. …

Teresa, Woodbridge – Front Door

Dear Management of Welda Windows and Mr. Joseph Rosenberg and Mr. Tony Converso. Just a short note to thank you and acknowledge how …

Frank V. & Sonia R., Burlington – Windows

Fabulous, Fabulous, Fabulous …. We are extremely ecstatic with our new windows and doors from Welda Windows. From beginning to end my …

Nella P., Toronto – Windows & Door

We asked Jimmy for a white aluminum enclosure with an insulated roof on top in front of main entrance door. I am impressed with their …

Nabeel Toronto – Porch Enclosure
@joedoe

Yesterday we had a new front door installed by Welda Windows & Doors. We went from a double door to a single door with two sidelights. …

Teresa, Woodbridge – Front Door

Dear Management of Welda Windows and Mr. Joseph Rosenberg and Mr. Tony Converso. Just a short note to thank you and acknowledge how …

Frank V. & Sonia R., Burlington – Windows

Fabulous, Fabulous, Fabulous …. We are extremely ecstatic with our new windows and doors from Welda Windows. From beginning to end my …

Nella P., Toronto – Windows & Door

The benefits of working with us

We understand that there are many windows and doors companies in Markham to choose from. There are hundreds of them! So why choose us?

High Quality

Searching for high quality windows & doors? WELDA provides only high quality products designed to last for many years to come.

Fair Pricing

What is a fair price? WELDA Windows offers the best combination of price and value. Our prices are incredibly affordable.

Expert Installation

What`s more important than price or quality? Installation! Since 1984 more than 40,000 homeowners have chosen WELDA Windows.

Excellent Warranty

Homeowners should consider WELDA for the long list of warranty benefits assured with every product purchased and installed.

Windows

Everyone wants quality windows, but not everyone wants the same size or style. That’s why WELDA offers a full selection of styles that can accommodate any design need or architectural style. The only factor that won’t differ from style to style, or size to size is the quality.

  • Vinyl Windows
  • Hybrid Windows
  • Casement & Awning Windows
  • Bay, Bow & Garden Windows
  • Slider Windows
  • Hung Windows
  • Fixed & Shaped Windows

Start your project today

Get in touch for an accurate, no-obligation quote.