Window Replacement Cost Calculator
| Type | Vinyl installed each | Typical 8 | The trade |
|---|---|---|---|
| Picture / fixed | $450-900 | $3,600-7,200 | cheapest, no ventilation |
| Double-hung | $550-1,100 | $4,400-8,800 | the American default |
| Casement | $650-1,300 | $5,200-10,400 | best seal per sash |
| Bay or bow | $2,800-6,500 | priced as one unit | structural, not insertable |
Window replacement pricing has a dirty secret: the sticker per window matters less than the two decisions hiding behind it - insert versus full-frame, and what the frame is made of. Installed inserts run $450-900 for picture windows, $550-1,100 for double-hung, $650-1,300 for casement, and $2,800-6,500 for a bay or bow unit, with wood frames multiplying the vinyl baseline by about 1.35 and fiberglass by 1.25. A whole main floor of eight double-hungs lands between $4,400 and $8,800 installed.
The calculator prices your exact list - count, type, frame - and then shows the number that actually sells the project: what drafty windows cost you per winter. Replacing single-pane windows with modern low-E double-pane units saves on the order of $100-500 per window per heating season depending on climate, which is why the draftiest rooms are the right first windows and the whole-house order is a luxury, not a rule.
The technology part is simpler than the industry wants it: look past brand names to U-factor and low-E coatings, both standard in double-pane glass with argon fill - the terms Lawrence Berkeley National Laboratory's window group has spent decades quantifying. Triple glazing adds 10-15 percent and earns it in the coldest climates; in most of the country, a good double-pane low-E unit is the entire game.
How to use
- Count the windows you actually want replaced - and start the list with the draftiest, because savings-per-window is wildly unequal across the house.
- Pick the type per opening: double-hung for the classic look, casement for the tightest seal and easiest cleaning, picture where ventilation does not matter and the budget thanks you.
- Pick the frame: vinyl for value, wood for historic interiors, fiberglass for the middle path - and note the multipliers before you fall in love with wood.
- Decide insert versus full-frame: inserts reuse the existing jamb at the table prices; rotten frames force full-frame at $200-400 extra per opening.
Frequently asked questions
How much does it cost to replace a window?
Installed inserts: $450-900 for a fixed picture window, $550-1,100 for a double-hung, $650-1,300 for a casement, $2,800-6,500 for a bay or bow - vinyl frames, standard sizes, double-pane low-E glass. Wood frames run about 1.35x, fiberglass 1.25x, and full-frame replacement (new jamb and trim) adds $200-400 per opening. Oversized, stained-glass or second-story-lift windows price above the band; the calculator handles the standard cases honestly.
Is it cheaper to replace all windows at once?
Usually, slightly - crews price mobilization once, and per-unit rates drop 5-10 percent on volume orders of ten or more. But the honest finance answer is that windows do not need to be replaced all at once: the drafty half of the house delivers most of the savings, and phasing by room spreads the cost across years without wasting the mobilization twice. Order the whole house only when the frames are uniformly failing, not when the salesman offers a same-day discount.
What are the signs a window needs full-frame replacement vs an insert?
Soft or crumbling wood at the frame bottom, rot that a screwdriver sinks into, sills that slope the wrong way, and chronic frame-leak caulking cycles all mean full-frame. Condensation between the panes alone means only the sealed unit died - an insert or even a glass-only swap fixes it. The probe test beats the sales pitch: if the frame wood is solid, the insert keeps your trim and a third of the price.
Do new windows really save on heating?
Yes, with honest scale: swapping single-pane for modern low-E double-pane saves roughly $100-500 per window per heating season depending on climate and exposure, which is why the first four drafty windows pay faster than the last twelve. Swapping old double-pane for new double-pane saves far less - the U-factor gain is incremental. The biggest residential lie in the industry is quoting whole-house savings off single-pane math for a house that already has double-pane everywhere.
Are wood windows worth it over vinyl?
For historic homes, yes - wood is the profile the architecture expects, and wood interior trim matches existing millwork; the 1.35x multiplier buys authenticity, not thermal performance (a good vinyl unit insulates as well or better). Vinyl wins value and never needs painting; fiberglass splits the difference at 1.25x with better dimensional stability in extreme climates. The thermal difference between the three frames is smaller than the glass package you choose.