How Long Do Windows Last?
What each option costs
| Option | Job | Low | High |
|---|---|---|---|
| Repair | Window Repair | $90 | $590 |
| Replace | Window Replacement (per window) | $370 | $1,300 |
Lifespan by material
These figures are general guides. NAHB's 2007 study notes that some parts of a wood window may need replacing along the way, so its lifespan can vary.
- Aluminum or aluminum-clad: 15 to 20 years (NAHB)
- Wood: 30 years or more (NAHB)
- Window glazing materials: 10 years or more (NAHB)
- Historic windows: more than 100 years with regular maintenance (National Park Service)
Old doesn't always mean finished
The National Park Service says to seal air leaks first with caulk and weatherstripping, then repair the glazing compound before thinking about replacement. It cites a 2002 study finding that a storm window over a historic window can perform about as well as a new low-E vinyl replacement.
When replacement makes sense
ENERGY STAR says to consider new windows if yours 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 location and the window replaced, and that you should insulate and air seal first.
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Common questions
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What should I check on my windows each year?
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Last verified 2026-11-03
- NAHB / Bank of America Home Equity: Study of Life Expectancy of Home Components (2007) — Aluminum or aluminum-clad windows 15 to 20 years; wood 30+ with parts possibly replaced; window glazing 10+.
- National Park Service: Weatherization of Historic Buildings, Windows and Doors — Historic windows have functioned more than 100 years; seal leaks before replacing; storm window can reach similar thermal performance to a new low-E vinyl replacement.
- ENERGY STAR: Storm Windows — Storm windows work best over windows in good condition; replace if rotted or damaged beyond reasonable repair.
- U.S. Department of Energy: Replacing Old Windows — Replacing old windows with ENERGY STAR models can save 7%-15% or more on annual household energy bills; insulate and air seal first.
- NC State Extension: Preventative Home Maintenance — Check for cracked or broken glass, loose putty and worn weatherstripping.
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.