Amy Ho
Craig and his team are very nice and professional. They had all protective pads and vaccums handy, and clean your window and doors carefully after installation. The window and door looks sturdy and secure with great noise reduction. 100% re…
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OPT Windows Ltd.
Window Installers in Markham, Ontario
Ranked #3 in Markham | Grade A-
OPT Windows Ltd.
OPT Windows Ltd. focuses on aluminum window and door solutions with an emphasis on solid construction and careful installation practices, including surface protection and post-work cleanup Serving homeowners across Markham, Ontario.
Why Homeowners Choose This Business
Customers cite careful preparation and cleanup, patient guidance on product options, and installations that feel sturdy and secure. The company offers aluminum solutions that improve insulation and noise control while maintaining a clean look Local experience that helps homeowners across Markham, Ontario compare a more region-aware provider.
Service Area
Serving homeowners in Markham, Ontario and nearby GTA communities, with travel dependent on project size and timing.
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How This Business Compares
A quick local comparison based on review strength, business detail, and local service fit.
- Maintains a competitive standing in this market.
- Performs at or above the local average rating.
- Shows strong customer satisfaction signals based on review quality and volume.
Services Covered
Renovation Services Window Installation Aluminum Windows Installations Patio Sliding Doors Secure Screen Doors Window Replacement Custom Windows Noise-reducing windows Energy Efficient Windows Door replacement Stainless Steel Mesh Doors Window Supplier GTA window installer
Window supply and installation, aluminum-framed window systems, custom-sized patio sliding doors, secure stainless steel mesh screen doors, and replacement of older units with improved insulation and noise reduction.
Reviews
Customer Reviews
Kristy Leung
Installed a new backyard secure screen door. Very well-made aluminium door frame with durable stainless steel mesh. It looks sturdy and feels secure. Thank you Craig and his team they’re very nice and helpful. 100% recommend to neighbours a…
Austin Guan
Craig's team did a great custom job replacing old patio sliding door. The new one feels super sturdy and offers great insulation which you can feel right off the bat. 10/10 would recommend to friends!
Boyang Li
We had to replace our slide door due to a break-in incident and my friend referred Craig for the job. They have ver high quality aluminum door&windows. The door feels really tough and safe now. Craig was very patient to our needs and had a…
Yilun Chen
Where should I start… I completed my house Reno weeks ago, it’s pretty lucky that I met lots of good contractors, and they are one of them, before I reach them I also checked with several other contractors, I should say that Opt gave me the…
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Frequently Asked Questions
What types of products does OPT Windows Ltd. install?
Reviews and listings indicate the company installs aluminum-framed windows, patio sliding doors, and secure screen doors with stainless steel mesh. They also handle custom sizing where required.
Do installations include cleanup and protection for my home?
Customers repeatedly mention the crew using protective pads and vacuuming after the work is done. The feedback suggests a tidy process from setup through final cleanup.
Can OPT Windows Ltd. replace older patio sliders with better insulation?
Yes, multiple reviews describe replacing older patio sliding doors with sturdier units that noticeably improve insulation. Homeowners reported feeling the difference right away.
Does the company offer secure screen door options?
Reviewers reference aluminum frames paired with durable stainless steel mesh that feels solid and secure. This option is popular for backyard or side entries.
How can I request a quote or consultation?
You can call the listed phone number or visit the company’s website to request a quote. Provide basic details about your windows or doors to help schedule a site visit.