Window Replacement Cost Calculator

Per-window installed costs by material: vinyl $400-$1,000, fiberglass $800-$1,500, wood $1,000-$2,500, composite $1,200-$2,500, bay/bow $2,500-$5,500. A 10-window project averages $7,000-$15,000 for vinyl; $15,000-$30,000 for premium wood or fiberglass. Pre-1980 homes may need lead-paint remediation adding $300-$500 per window.

For energy: Energy Star-certified replacements save $125-$465/year (single-pane to double low-E) or $30-$110/year (double-pane to triple-pane) per Energy Star data. Payback typically 15-30 years on energy alone. 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).

Section 25C Energy Efficient Home Improvement Credit covers 30% of cost up to $600/year for Energy Star-certified windows and skylights. Reset annually - you could do half your house one year and the other half the next to capture two $600 credits. Sliding doors qualify under a separate $250 cap; entry doors at $250 cap (max $500/year for all doors).

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.