Should I Repair or Replace My Windows?
What each option costs
| Option | Job | Low | High |
|---|---|---|---|
| Repair | Window Repair | $90 | $590 |
| Replace | Window Replacement (per window) | $370 | $1,300 |
Repair first if the frame is sound
The National Park Service's guidance for historic windows puts repair first, and common repairs include:
- Renewing the paint or finish
- Repairing damaged wood with epoxy
- Replacing worn parts
- Adding weatherstripping
When replacement makes sense
ENERGY STAR points to replacement when windows are rotted, not operating properly, or damaged beyond reasonable repair. The Department of Energy says new ENERGY STAR windows can save 7% to 15% or more on annual household energy bills, depending on where you live and what you're replacing, and that you should insulate and air seal first.
Be skeptical of big savings claims
The National Park Service calls the claim that replacement windows save as much as 50% in energy costs a misconception. ENERGY STAR's national estimate for low-e storm windows over single-pane glass is about 10% on heating and cooling. Savings depend on climate, your home and local rates.
Run the numbers
Use the cost comparison on this page to set a repair estimate against a replacement estimate for your area.
Common questions
Do storm windows really work?
What if the seal between the panes has failed?
Does my house's age matter?
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Last verified 2026-11-03
- National Park Service: Evaluating Historic Windows for Repair or Replacement — Repair is the first option considered for historic windows; condition is the primary factor; repair types include finishes, epoxy repairs, parts and weatherstripping.
- National Park Service: Weatherization of Historic Buildings, Windows and Doors — Seal air leaks first; storm window can perform similarly to a new low-E vinyl replacement; replacement rarely pays for itself quickly; 50% energy savings claim is a misconception.
- ENERGY STAR: Storm Windows — Storm windows work best on windows in good condition; replace if rotted, not operating or damaged beyond reasonable repair; low-e storm savings.
- U.S. Department of Energy: Replacing Old Windows — New ENERGY STAR windows can save 7%-15% or more on annual energy bills; insulate and air seal first.
- NAHB / Bank of America Home Equity: Study of Life Expectancy of Home Components (2007) — Aluminum windows 15 to 20 years; wood 30+.
General information, not professional advice. Conditions, codes and prices vary. Turn off power, gas or water before any work, and hire a licensed professional when in doubt. Cost figures are our estimates, not quotes.