How we estimate window replacement cost
Every estimate combines a national price for each part of the job with a local labor adjustment for your state. Here is exactly how that works and where the numbers come from.
The formula
For each line item we multiply a quantity (driven by the number of windows, their size and style, frame and glazing material, and whether they are full-frame or insert replacements) by a national unit cost, then apply a quality-grade factor. A regional labor multiplier is applied to the labor portion only — materials are priced nationally. We show the itemized result as a ±20% range.
National unit costs
| Line item | National unit cost | Source |
|---|---|---|
| Old window removal | $70.00 / sq ft | ref |
| Window unit | $320.00 / sq ft | ref |
| Installation labor | $180.00 / sq ft | ref |
| Trim, flashing & finish | $60.00 / sq ft | ref |
| Disposal | $20.00 / sq ft | ref |
Regional labor multipliers
Each state's labor multiplier is its mean carpenter wage relative to the national mean, from the U.S. Bureau of Labor Statistics Occupational Employment & Wage Statistics (Carpenters, SOC 47-2031) — used as a proxy because window installation has no dedicated occupation code, and glaziers (SOC 47-2121) are too small a sample for reliable 50-state coverage. Multipliers are bounded to a sane range and applied to the labor share of each line item, so materials stay nationally priced while labor tracks local wages.
Data vintage & limitations
Compiled June 2026 from public cost aggregators and government wage data — these are derived estimates, not live contractor quotes. Local prices vary with project complexity, access, and material availability; always confirm with a licensed contractor before budgeting.
Sources
- https://homeguide.com/costs/window-replacement-cost
- https://taxfoundation.org/data/all/state/sales-tax-rates-midyear-2025/
- https://www.bls.gov/ooh/construction-and-extraction/carpenters.htm
- https://www.nerdwallet.com/home-ownership/windows/learn/replacement-windows-cost
- https://www.pro-mapper.com/windows-and-doors/window-replacement-cost/