Window Replacement Cost Calculator

Per-window installed costs by material: vinyl $400-$800, fiberglass $800-$1,500, wood (clad) $1,000-$2,500, aluminum $500-$900. A 10-window project averages $6,100-$12,200 for vinyl; $10,700-$31,750 for premium wood or fiberglass. Bay/bow windows use a 3.2x style multiplier on top of the material price, so they run far more per opening than a standard window. Pre-1978 homes may need lead-paint remediation adding $255-$375 per window.

For energy: Energy Star-certified replacements save $125-$465/year (single-pane to double low-E) or $60-$180/year (old double-pane to new Energy Star double or triple) per Energy Star data; pick your current windows in the calculator above to switch the estimated savings between these two bands. Payback on energy alone varies widely by material: standard vinyl double-hung replacements (like the worked example above) typically pay back in under 10 years, while premium options such as wood or bay/bow windows can take 15-30 years. The bigger ROI: comfort improvement (no drafts, no cold zones near windows), reduced street noise, increased home value (60-70% recouped at resale per Remodeling Magazine).

No, not anymore. The Section 25C Energy Efficient Home Improvement Credit used to cover 30% of cost up to $600/year for Energy Star-certified windows and skylights, but the One Big Beautiful Bill Act (OBBBA) repealed Section 25C for property placed in service after December 31, 2025. Window projects completed in 2026 or later no longer qualify.

Repair if frames are sound and you can add interior storm windows or weatherstripping ($30-$200/window) - this captures 60-70% of new-window energy benefits at 5-15% of the cost. Replace if frames are rotted, sashes don't hold position, condensation between panes, or you're renovating anyway. Historic homes often require special permits and matching profiles.

In very cold climates (IECC zones 6, 7, or 8) or where there's a lot of outside noise, yes. In mild climates it rarely pays back the 20% premium. Double-pane low-E with argon already reaches U < 0.30, which satisfies most codes.

The EPA requires that any renovation on homes built before 1978 that disturbs more than 6 sq ft of paint be performed by an RRP (Renovation, Repair and Painting) certified contractor. This adds $200-$500 per project for containment, cleanup, and testing to avoid lead-dust exposure.