Window replacement cost calculator
Estimate a whole window replacement job from your own per-window price, labor, add-ons and a contingency buffer — a planning number, not a bid.
Replacing 10 windows at $500.00 each plus labor and add-ons is about $7,150.00 with 10% contingency. Enter the prices from your own quotes — a planning estimate, not a bid.
Calculator inputs
Window replacement is priced per opening, then labor, add-ons and a contingency buffer are stacked on top. This estimator keeps every dollar figure in your hands: enter the per-window price and labor from a real quote, add anything the crew flagged (full-frame conversion, custom sizes, trim and casing, old-window disposal, two-story access, lead-safe work on a pre-1978 home), subtract any package discount, and pad the total with a contingency for the surprises that hide behind old trim — rot, out-of-square framing, or a hidden header.
Because the site holds no price list, the number never goes stale: it is only ever as current as the quote you type in. Treat the result as a planning estimate to sanity-check a bid, not as the bid itself.
Formula
total = (count × your $/window + labor + add-ons − discount) × (1 + contingency%)
The contingency multiplies the whole subtotal, so it also cushions labor and add-ons, not just the windows.
Worked example
Ten windows at $500 each is $5,000. Add $1,500 labor and $0 add-ons, subtract $0 discount → a $6,500 subtotal. A 10% contingency brings it to $6,500 × 1.10 = $7,150.
Push the same ten windows to a $700 premium unit and the windows alone jump to $7,000, and the contingency scales with them — which is exactly why the buffer is a percentage, not a flat number.
What drives the number — and the traps
The single biggest swing is full-frame vs insert (pocket). An insert reuses the existing frame and is the cheaper path; a full-frame replacement strips the opening to the studs and adds trim, flashing and exterior finish — budget it as an add-on (see the full-frame vs insert calculator). After that, the usual add-on lines are custom sizing (a replacement measured to an existing opening is almost always custom by a fraction of an inch), two-story or hard-access labor, casing and trim, disposal, and lead-safe practices on a home built before 1978.
Measure before you price. A quote for the wrong count or the wrong size is not a quote for your job. Count each operable and fixed opening with the window count calculator, size each with the united-inches calculator, and check any bedroom escape window against IRC R310 egress before you commit — changing egress can trigger a permit and a bigger opening.
Common mistakes: forgetting the contingency entirely; pricing the window but not the labor; comparing an insert quote against a full-frame quote as if they were the same scope; and treating a labeled band as a target price. Always get itemized written quotes from licensed, insured installers.
Reference table
| Window type | Typical installed $/window | Fit |
|---|---|---|
| Double-hung | $300–$800 | Two vertical sashes; the value default |
| Casement | $400–$1,000 | Crank-out; seals tight, opens fully for egress |
| Sliding | $350–$900 | Horizontal glider; value option |
| Awning | $400–$1,000 | Top-hinged; vents in rain |
| Picture | $300–$1,200 | Fixed; best U-factor, no ventilation |
| Bay / bow | $1,500–$4,500 | Projecting multi-panel unit |
Labeled planning bands for installed replacement windows (material + labor). You enter your own quoted price — the band is only a sanity guide.