Home improvement
Window Replacement Cost Calculator
Works window replacement cost, where the installation type changes everything.
Result
Full-frame replacement costs considerably more than insert replacement, and rotted framing is rarely visible until the old unit is out. That is what the structural allowance is for.
Get a Free Business AuditHow the calculation works
Units times the price per unit plus installation, with the installation type being the major variable. An insert replacement fits a new unit into the existing frame; a full-frame replacement removes the frame back to the opening, which costs considerably more and is necessary where the existing frame has failed.
What moves the number
- Insert against full-frame replacement.
- Unit size, style and glazing specification.
- Condition of the existing frames and surrounding structure.
- Interior and exterior finish work after installation.
Where this one goes wrong
An insert replacement into a rotten or out-of-square frame fails, which means the frame condition rather than the budget determines which approach is possible, and a quote for inserts on a house that needs full-frame work is a quote for a job that will not last. Have the frames assessed. Finish work is the other item, since full-frame replacement disturbs the interior and exterior finishes around the opening and restoring them is a real cost frequently left out of a quote.
Before you quote
- Have the existing frames assessed before choosing the approach.
- Confirm whether interior and exterior finish work is included.
- Compare quotes on the same installation type.
Questions
About this calculator
What is the difference between insert and full-frame replacement?
An insert fits a new unit into the existing frame; full-frame removes the frame back to the rough opening. Full-frame costs considerably more and is necessary where the existing frame has rotted or moved out of square.
Why do window quotes differ so much?
Frequently because they are for different installation types. An insert quote and a full-frame quote are for different jobs, and comparing them on price without establishing which each covers compares nothing.
What gets left out of a window quote?
Interior and exterior finish work around the opening, which full-frame replacement disturbs. Restoring trim, plaster and siding is a real cost, and a quote silent on it leaves the homeowner with the finishing to arrange.
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How to use this calculator
- Number of windows. Enter your own figure; the page starts at 12.
- Cost per window unit ($). Enter your own figure; the page starts at $480.
- Installation per window ($). Enter your own figure; the page starts at $260.
- Windows needing frame repair. Enter your own figure; the page starts at 2.
- Extra cost per repair ($). Enter your own figure; the page starts at $350.
- Contingency (%). Enter your own figure; the page starts at 10%.
The result updates as you type, so you can try a figure, see what it does to total estimated cost, and change it back. Nothing you enter is sent anywhere or saved.
A worked example
These are the figures the calculator opens with. Every number in the results column below is produced by the same calculation the page runs, so you can follow it through before putting your own figures in.
What goes in
| Input | Value |
|---|---|
| Number of windows | 12 |
| Cost per window unit | $480 |
| Installation per window | $260 |
| Windows needing frame repair | 2 |
| Extra cost per repair | $350 |
| Contingency | 10% |
What comes out
| Result | Value |
|---|---|
| Total estimated cost main result | $10,538 |
| Average cost per window | $878.17 |
| Window units | $5,760 |
| Installation | $3,120 |
Replacing 12 windows comes to about $10,538, $878.17 per window including installation and contingency.
How sensitive the answer is
Holding everything else steady and changing only cost per window unit, this is what happens to total estimated cost. It is worth knowing which of your inputs the answer actually hinges on, and which barely move it.
| Cost per window unit ($) | Total estimated cost |
|---|---|
| $240 | $7,370 |
| $360 | $8,954 |
| $480 example above | $10,538 |
| $720 | $13,706 |
| $960 | $16,874 |
Every other input is held at the example value while this one changes, which is not how a real job behaves. Treat it as a guide to which number matters most, not as five separate quotes.
What each figure means
- Number of windows
- A number, between 0 and 500, starting at 12.
- Cost per window unit ($)
- A money amount, starting at $480.
- Installation per window ($)
- A money amount, starting at $260.
- Windows needing frame repair
- A number, between 0 and 500, starting at 2.
- Extra cost per repair ($)
- A money amount, starting at $350.
- Contingency (%)
- A percentage, between 0 and 50, starting at 10%.
What the results tell you
| Result | What it is |
|---|---|
| Total estimated cost | The headline result. A money figure. |
| Average cost per window | A money figure. |
| Window units | A money figure. |
| Installation | A money figure. |
Keep going
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