3 Best Windows & Door Companies In Markham
Expert-recommended Top 3 Windows & Doors companies in Markham, ON. Every company below is hand-picked and verified through our 30-point review of reputation, customer reviews, service, product quality, and local presence. You deserve only the best!
Mullions is an independent directory and is not affiliated with or endorsed by the City of Markham.
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EcoTech Windows & Doors
- Vinyl Windows
- Casement Windows
- Awning Windows
- Entry Doors
- Patio Doors
- Window & Door Installation
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Canadian Choice Windows and Doors
- Vinyl Windows
- Casement Windows
- Awning Windows
- Entry Doors
- Patio Doors
- Window & Door Installation
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Clera Windows + Doors Concord
- Vinyl Windows
- Casement Windows
- Awning Windows
- Entry Doors
- Patio Doors
- Window & Door Installation
Windows & Doors in Markham: A Local Buyer's Guide
Markham pairs historic Main Street Unionville and Markham Village with modern planned communities like Cornell and Berczy — a fast-growing city where both heritage and new homes benefit from high-performance windows.
🌡️ Climate & what to buy
The Greater Toronto Area sees cold winters with -20°C wind-chills and humid 30°C-plus summers. Triple-pane, low-E, argon-filled ENERGY STAR windows and insulated fibreglass or steel doors deliver the best comfort and energy savings — and air-tight installation matters as much as the glass to stop drafts.
📋 Permits & bylaws
In Markham, like-for-like window and door replacement generally does not require a building permit, but you'll need one to enlarge an opening, add a new opening, or alter a load-bearing wall. Heritage-designated properties may need added approval. Confirm with the City of Markham before starting.
💰 Rebates & incentives
Markham homeowners who heat with natural gas can often use the Enbridge Gas Home Efficiency Rebate Plus (HER+) program toward windows and doors as part of a retrofit with a pre- and post-project energy assessment, alongside the federal Canada Greener Homes Loan. Programs change frequently — ask your installer what's current before you sign.
📅 Best time to install
Spring and fall are ideal — mild temperatures let sealants and expanding foam cure properly, and installers have shorter wait times than during the summer rush.
Serving neighbourhoods across Markham: Unionville · Milliken · Cornell · Berczy Village · Markham Village · Thornlea
Why Hire a Local Window & Door Expert in Markham?
Working with a local professional in Markham means faster service, climate-right materials, and someone who knows Ontario building codes and stands behind the work.
- ✅ Faster response times — local crews schedule estimates and installs quicker than out-of-town providers.
- 🌡️ Climate-specific advice — they know which materials perform best in Markham.
- 📋 Permits & bylaws — avoid delays or fines with a contractor who knows the local rules.
- 🔧 Reliable aftercare — if an issue arises, your contractor is a call away, not in another city.
- ⭐ Trusted reputation — local businesses live and die by word-of-mouth and reviews.
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Common Window & Door Services in Markham
Local pros in Markham handle everything from energy-efficient upgrades to full entryway transformations. The most-requested services:
Window Replacement & Installation
Upgrade old or damaged windows with energy-efficient double-pane, triple-pane, or low-E glass units.
Door Replacement & Installation
Improve curb appeal and security with quality front doors, patio sliders, and custom entry systems.
Sliding & French Patio Doors
Add functionality and natural light with space-saving sliding doors or elegant French doors.
Custom Window Solutions
Bay windows, bow windows, or oversized picture windows for unique architectural needs.
Energy-Efficient Upgrades
ENERGY STAR® certified windows and insulated doors built for Markham's climate.
Window & Door Repairs
Fix cracked frames, foggy glass, faulty locks, and weather stripping — without full replacement.
Retrofit & Full-Frame Installation
Choose retrofit (keeping the existing frame) or full-frame installation for a complete upgrade.
Condensation & Draft Solutions
Resolve air leaks, poor sealing, and moisture build-up for better indoor comfort.
Average Cost of Windows & Doors in Markham, Ontario
Costs vary by material, size, style, and installation method. Typical Markham price ranges:
| Service Type | Average Cost (Installed) |
|---|---|
| Standard Vinyl Window (per unit) | $450 – $900 |
| Triple-Pane Window (per unit) | $700 – $1,200 |
| Bay or Bow Window | $2,000 – $4,000+ |
| Entry Steel Door | $1,000 – $1,800 |
| Fiberglass Entry Door | $1,500 – $2,500 |
| Sliding Patio Door | $1,200 – $2,800 |
| French Door (Double) | $1,800 – $3,500 |
Frequently Asked Questions
How does Mullions choose the top 3 companies in Markham?
Each business is evaluated against our 30-point review standard — reputation, customer reviews, licensing, online presence, and business integrity — before being featured.
Is it free to request quotes in Markham?
Yes. Submitting the quote form is completely free for homeowners, and your request goes to all featured companies in Markham at once.
Do I need a permit to replace windows or doors in Markham?
In Markham, like-for-like window and door replacement generally does not require a building permit, but you'll need one to enlarge an opening, add a new opening, or alter a load-bearing wall. Heritage-designated properties may need added approval. Confirm with the City of Markham before starting.
What does it cost to replace windows in Markham?
Most windows run $450–$1,200 per unit installed depending on material and glass; a full-home project is typically $8,000–$18,000. See the price table below.
How soon will companies respond?
Most featured local companies respond within one business day.