Anderson Windows Windsor
WindowsWindsor
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How to Hire a Window & Door Replacement Contractor in Ontario
Window and door replacement in Ontario requires a building permit in most municipalities if you're changing the rough opening size. Installers should be certified by the Fenestration Association of Ontario (FenCAN) and use products that meet Energy Star® Canada specifications for the Ontario climate zone. Proper air sealing and insulation of the rough opening is as important as the window itself.
This selection shows 3 businesses. Confirm that a business offers what you need.
Bay Area Windows & Doors
WindowsBarrie
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Kingston Glass Co.
WindowsKingston
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Check the qualifications that matter for your work
Ask what qualifications, insurance and approvals are relevant to your particular job. Verify the details with the issuing organisation. Being listed here is not a licence check or an endorsement.
When to Hire a Window & Door Replacement Contractor
- Windows are drafty, fogged between panes, or have failed seals
- You're seeing condensation on the inside of glass in cold weather
- Windows are difficult to open, close, or lock properly
- Your home was built before 1990 and has single-pane windows
- You're replacing an exterior door that has significant air leakage
- You want to qualify for the Canada Greener Homes Grant
Timeline: Single window replacement takes 2-4 hours. Full house (10-15 windows) takes 2-3 days. Sliding patio door replacement takes 4-6 hours. Entry door replacement takes 3-5 hours.
Window & Door Replacement Costs in Ontario (2026)
Window Replacement$500 — $1,800
per window installed
Entry Door$1,500 — $6,000
installed
Patio Sliding Door$2,000 — $6,000
installed
Full House Windows$8,000 — $30,000
average home
Window Frame Repair$300 — $1,200
per window
Prices are approximate for Ontario (CAD). Actual costs vary by city, scope, and season. Always get 3 written quotes.
Questions to Ask Before Hiring
- 1Are your products Energy Star® certified for Zone C (Ontario)?
- 2Do you pull the required building permit for rough opening changes?
- 3What is the warranty on the window unit itself vs. your installation?
- 4How do you handle the interior and exterior trim after installation?
- 5Are you a certified installer for the brand you're selling?
- 6What is included in clean-up and disposal of old windows?
- 7Do you offer financing, and what are the terms?
Red Flags — When to Walk Away
- Non-Energy Star certified products
- No written warranty on product and labour
- Vague installation timeline
- Won't show proof of liability insurance
Homeowner Checklist — Before You Hire
- Get at least 3 written quotes for comparison
- Verify WSIB clearance certificate (protects YOU from liability)
- Check Google reviews AND ask for local references
- Confirm they will pull all required permits
- Never pay more than 10-15% deposit upfront
- Get everything in writing — scope, timeline, payment schedule
- Verify their business insurance is current
- For regulated trades (electrical, plumbing, gas), verify their license number
Payment: 10-15% deposit, progress payments tied to milestones, 10% holdback until completion. Ontario's Construction Act provides a 10% holdback right on construction projects.
Best Time to Hire a Window & Door Replacement Contractor
springMarch — May
Spring is peak booking season. Contact contractors in February for the best availability.
summerJune — August
Summer is the busiest season. Prices are highest and wait times longest. Book early.
fallSeptember — November
Fall is the sweet spot — contractors are less busy, prices drop, and you prepare for winter.
winterDecember — February
Winter is off-season for exterior work. Interior renovations get the best prices and fastest timelines.
How to Verify a Window & Door Replacement Contractor in Ontario
Frequently Asked Questions — Hiring a Window & Door Replacement in Ontario
- How are listings ordered?
- Owner-claimed listings come first, then profile completeness and name. Sponsored placements are labelled and do not change the organic order.
- Does a listing mean NSO endorses a business?
- No. Check that the business offers what you need. Ask about relevant qualifications, insurance and licensing, and confirm those details with the business or issuing organisation.
- How do I compare options?
- Read the recorded business details, ask about availability and request a quote for your actual requirements. Confirm the scope and price before booking.
- What if a business is missing or its details are wrong?
- Use Add a missing business or Claim an existing listing. These are reviewed requests; they do not automatically publish a record or verify ownership.
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Ready to Find a Window & Door Replacement Contractor?
Browse 16 listed window & door replacement contractors in our directory. Read the recorded business details and confirm your requirements.