Replacing your windows is one of the most effective ways to improve comfort, reduce energy costs, and increase the long-term value of your home. NTI Windows & Doors provides professional window replacement services across the Greater Toronto Area, including Toronto, Mississauga, Vaughan, Markham, Richmond Hill, and surrounding communities.
Our focus is on proper installation, energy efficiency, and long-term performance. We install Canadian-made vinyl windows designed for Ontario’s climate and tailored to a wide range of home styles found throughout the GTA.
Trusted by homeowners across Toronto and the GTA
Why Homeowners Across the GTA Replace Their Windows
If you are experiencing any of the following, window replacement is more than a cosmetic upgrade. It is a functional improvement that enhances comfort, energy efficiency, and overall home performance throughout the year:
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Rising heating and cooling costs
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Drafts and inconsistent indoor temperatures
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Condensation or fogging between glass panes
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Outside noise from traffic and neighboring properties
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Aging or poorly installed windows from past renovations
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Improving comfort and energy efficiency before selling or remodeling
Energy-Efficient Window Options for GTA Homes
We supply and install high-performance vinyl windows engineered specifically for Ontario’s climate. Our window options include double and triple-pane glass, low-E coatings, argon gas fills, and advanced spacer systems designed to reduce heat loss and improve insulation.
Triple-pane windows are a popular option across the GTA, particularly in urban and high-traffic areas, as they help reduce exterior noise while maintaining consistent indoor temperatures.
Installation Comes First — Always
Even the highest-quality window will underperform if it is installed incorrectly. At NTI Windows & Doors, we follow an installation-first approach on every project to ensure long-term durability, energy efficiency, and proper operation.
Our installation process includes careful removal of existing windows, preparation of the opening, air sealing and insulation around the frame, precise leveling, and clean interior and exterior finishing. This process ensures your new windows perform as intended for years to come.
Window Replacement Cost in the GTA
The cost of window replacement in the Greater Toronto Area varies based on factors such as the number of windows, window size and configuration, glass options, and installation requirements specific to your home.
Because no two homes are the same, we provide clear and transparent pricing following a free in-home assessment. Our quotes are straightforward, easy to understand, and include professional installation with no hidden fees.
Warranty & Long-Term Support
We stand behind our work with comprehensive warranty coverage on both product and installation. Our windows are backed by long-term manufacturer warranties, and our workmanship is supported should you ever require service after installation.
As a local company serving homeowners throughout the GTA, we remain available long after your project is complete. You will always be dealing directly with our team — not a call centre.
Book a Free Window Replacement Estimate
If you are considering window replacement anywhere in the Greater Toronto Area, we invite you to schedule a free, no-obligation in-home consultation. We will assess your existing windows, explain your options clearly, and help you make an informed decision without pressure.
