Window Replacement Cost Estimator
Enter how many windows and what type for installed replacement pricing.
Runs entirely in your browser — your numbers never leave this page.
How it works
Window cost = unit price × count, with installation type as the multiplier:
- Vinyl (~$650 installed): the value pick — low maintenance, good efficiency, 20+ year life.
- Wood (~$1,100): prettiest, needs painting; best for historic homes.
- Fiberglass (~$950): strongest frame, minimal expansion — the contractor's favorite.
- Bay/bow (~$2,800): structural work included; priced per unit, not per sash.
- Retrofit vs full-frame: retrofit keeps the old frame (cheaper); full-frame replaces everything (~35% more) — required for rot.
- Payback: replacing single-pane with double-pane saves ~$45/window/year — comfort is the real return, not the payback math.
Frequently asked questions
How much does window replacement cost?
About $650/window installed for vinyl retrofit, $950–1,100 for fiberglass/wood, ~$2,800 for bay windows.
Retrofit vs full-frame?
Retrofit reuses the existing frame (cheaper); full-frame replaces it all (~35% more) — needed for rot, damage, or resizing.
How many windows should I replace at once?
All of them — bulk pricing at 8–10+ windows beats piecemeal, and one crew visit is far cheaper than several.
Do new windows pay for themselves?
Energy savings (~$45/window/year vs single-pane) give a 15–20 year payback — buy them for comfort and resale, not ROI.
Vinyl vs wood vs fiberglass?
Vinyl: cheapest, low maintenance. Wood: beautiful, needs paint. Fiberglass: strongest, most stable — the pro pick.
How long does installation take?
About 30–60 minutes per retrofit window — a whole house in 1–2 days.
What is a good U-factor?
0.30 or lower for most US climates; lower is better. Look for ENERGY STAR certification for your zone.
Should I replace all windows or just bad ones?
Replacing all at once gets bulk pricing and uniform looks. But if budget is tight, do the worst elevations first.
Do I need permits?
Retrofit usually no; full-frame and structural changes usually yes. Your installer typically handles it.
Best time of year?
Late fall/winter — installers are slower and discount. A good crew seals each opening the same day, so cold isn't an issue.