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Window Replacement in Ontario: Costs, Retrofit vs. Full-Frame, Repair or Replace, Rebates and How to Read the Quotes
Windows & DoorsReplacement
Window Replacement in Ontario: The Cost, the Two Ways to Do It, the Windows That Do Not Need It, and the Quotes
Installed prices by opening, three real houses priced through, and the decisions that come before anyone measures anything.
The quote is the last step. Before it, you need to know which windows actually failed and how, whether the old frames stay or go, roughly what each opening should cost, and what the rebate program really pays. Do those in order and the three quotes stop looking random.
The numbers
$1,060average per window, typical house, retrofit vinyl
+40%full-frame
$250 to $450a new sealed unit, if that is all that failed
10 daysto cancel anything signed at your kitchen table
The guides
Window replacement cost in Ontario
Per window, per house, retrofit vs. full-frame, with three real houses priced through to HST.
Retrofit vs. full-frame
What each one is, the 40% difference, and the four times full-frame is the only honest answer.
Repair or replace?
Fogged glass, drafts, rot and stuck sashes, and which ones are a $250 fix instead of a $1,100 window.
How long windows last
Vinyl, wood, fibreglass and the sealed unit, by the Ontario winters each one gets.
Window rebates in Ontario
The $100 an opening, the assessment you need first, and why windows alone do not qualify.
How to compare window quotes
The sixteen lines every quote needs, the grid, and the questions to send back.
Window sales tactics
The two-hour kitchen table visit, the price that expires tonight, and the one sentence that ends it.
Permits for windows and doors
Same opening no, bigger opening yes, plus egress, tempered glass and the property-line rule.
The calculators
Window replacement cost calculator
Every opening on its own line by type and size, vinyl or fibreglass, double or triple, retrofit, full-frame or new construction, doors on the same sheet, HST on the bottom. Writes the schedule for three quotes.
Exterior door cost calculator
Steel or fibreglass entry doors with sidelights, transoms, glass and locks; sliding, French and 8-ft patio doors; the wall, the floor and the finishing. The whole system, installed.
The order to do it in
- Window by window, decide what failed. Screwdriver in the sill corners, a look at the glass, a hand at the sash on a windy night. The test takes a third of the windows off most lists.
- Decide retrofit or full-frame, by the frames, not by the price. The four times you need full-frame.
- Book the energy assessment if you want the rebate, before anyone signs anything. The rules.
- Price it yourself. The calculator gives a range and a written schedule. Three companies pricing the same schedule is the only way three quotes compare.
- Pick the frame, the glass and the style, then the company. Types and performance.
- Three quotes on the grid, nobody signed at the first visit. The grid.
Have quotes or plans in hand? Let a builder read them first
For $99, I read your window and door quotes against your openings and send back what is missing, where the price is out of line with October 2026 Ontario rates, and the questions to ask before you sign. For a new build, $249 turns your plans into a checked window and door schedule three manufacturers can quote the same way. The quote review and the schedule takeoff.
