A properly installed exterior door is essential for your home’s security, energy efficiency, and long-term comfort. NTI Windows & Doors provides professional door installation and door replacement services across the Greater Toronto Area, serving homeowners in Toronto, Mississauga, Vaughan, Markham, Richmond Hill, and surrounding communities.
Whether you are replacing an aging entry door, improving insulation, or coordinating a full window and door replacement project, our experienced installers ensure your new door is installed correctly — sealed, aligned, and built to perform in Ontario’s climate.
Trusted by homeowners across the GTA for professional window and door replacement.
Why Homeowners Across the GTA Replace Their Doors
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Drafts or air leaks around the door
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Difficulty opening, closing, or locking
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Poor insulation contributing to higher energy costs
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Aging or damaged doors from previous renovations
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Improving home security and curb appeal
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Preparing for resale or renovation projects
Door replacement is often completed alongside window replacement to improve comfort, efficiency, and security throughout the home. Coordinating both upgrades allows homeowners to maximize performance while reducing long-term operating costs.
Energy-Efficient & Secure Exterior Doors for GTA Homes
We install a wide range of exterior doors designed for durability, insulation, and security. Our door options include entry doors, patio doors, and sliding doors available in fiberglass and steel, with ENERGY STAR®–rated models that help reduce heat loss and improve overall efficiency.
For homeowners upgrading both windows and doors, energy-efficient improvements may also support eligibility for federal incentive programs such as the Canada Greener Homes grant and loan.
Professional Installation Makes the Difference
Even the highest-quality door will underperform if it is not installed correctly. At NTI Windows & Doors, our professional door installers follow an installation-first approach to ensure proper fit, alignment, air sealing, and secure operation.
Our process includes careful removal of the existing door, preparation of the opening, insulation and air sealing, precise leveling, and clean interior and exterior finishing. This attention to detail is what separates professional installers from volume-based installation companies.
Door Installation Cost in the GTA
The cost of door installation in the Greater Toronto Area depends on several factors, including door type, material, size, configuration, and the installation requirements of your home.
Because every home is different, we provide transparent pricing following a free in-home assessment. This allows homeowners to understand their options clearly, compare value accurately, and move forward without hidden fees or surprises.
Warranty & Long-Term Support
We stand behind our work with comprehensive warranty coverage on both product and installation. Our doors are backed by manufacturer warranties, and our workmanship is supported should you ever require service after installation.
As a local company serving homeowners across the GTA, NTI Windows & Doors remains available long after your project is complete. You will always deal directly with our team — not a call centre.
Book a Free Door Installation Estimate
If you are considering door installation or door replacement anywhere in the Greater Toronto Area, we invite you to schedule a free, no-obligation in-home consultation. Our team will assess your existing door, explain your options clearly, and help you make an informed decision without pressure.