Cost guide

7 Signs You Need New Windows (And 3 That Just Need a Repair)

Q: When should I replace a window instead of repairing it?

Replace when a repair costs more than about 30% of replacement, or when the window is 20+ years old and this is its second repair. Otherwise a targeted fix is fine.

Q: Which window problems only need a repair?

A cracked pane can be re-glazed for $100–$300, locks and cranks are replaceable parts, and a torn screen is about a $20 fix. None of these require full replacement.

By Sunny Park, Founder & EditorUpdated July 12, 2026

Sunny Park founded WindowQuoteGuide and researches replacement-window pricing across U.S. markets, turning contractor quotes and public cost data into plain-English guides homeowners can actually use.

Window companies want you to replace everything. Your wallet wants you to replace nothing. The truth is a checklist. Here are the signs that genuinely mean "replace" — and the ones that don't.

A woman wrapped in a blanket and wearing a hat, looking cold indoors next to a large window with snow outside — Bundling up indoors beside an aging, worn window is often a sign its seal or insulation has quietly given out.

Real signs it's time to replace

1. Fog or condensation between the glass panes. This means the insulated seal has failed and the argon fill is gone — the window has lost its efficiency and it can't be re-sealed economically. This is the single clearest replacement signal.

2. Drafts you can feel with the window closed and locked. Hold a candle or incense stick near the edges on a windy day. Visible flicker = air pouring through. Weatherstripping helps for a season; a failing frame doesn't heal.

3. Sashes that won't stay up (or won't open). Broken balances in old double-hungs can sometimes be repaired — but when the frame itself has warped or swollen, operation problems return every season.

4. Soft, spongy, or rotting wood frames. Poke the exterior frame with a screwdriver. If it sinks in, water is inside the wood. Rot spreads to the wall framing, and that repair costs far more than a window.

5. Single-pane glass, period. If your home still has original single-pane windows, replacement is less a repair decision than an energy decision — single panes lose roughly twice the heat of modern double-pane units.

6. Rising energy bills with no other explanation. Windows aren't always the culprit (attic insulation usually pays back faster), but if bills climb and rooms near windows are noticeably hot or cold, the glass is telling you something.

7. Outside noise got loud. Failing seals let sound through the same paths as air. If traffic suddenly sounds closer, the window envelope is going.

Signs that usually mean repair, not replace

Cracked glass, hardware problems, and torn screens. A cracked pane can be re-glazed ($100–$300), locks and cranks are replaceable parts, and screens are a $20 fix. A pushy rep who quotes full replacement for a cracked pane is telling you about the company, not the window.

A useful rule of thumb: if the repair costs more than about 30% of replacement — or the window is 20+ years old and this is its second repair — put the money toward a new unit instead.

Frequently asked questions

When should I replace a window instead of repairing it?

Replace when a repair costs more than about 30% of replacement, or when the window is 20+ years old and this is its second repair. Otherwise a targeted fix is fine.

Which window problems only need a repair?

A cracked pane can be re-glazed for $100–$300, locks and cranks are replaceable parts, and a torn screen is about a $20 fix. None of these require full replacement.

How do I know how many windows are actually failing?

Go window by window and count the ones showing real failure — fogging, drafts, won't close — then price replacement for that number instead of assuming the whole house.

Count the failing windows, then price it

If you spotted two or more "replace" signs across several windows, price the full project — replacing together costs meaningfully less per window than one-at-a-time service calls. Our free calculator gives you a ZIP-code-adjusted estimate in about 60 seconds, no email required

Calculate my window replacement cost →

WindowQuoteGuide is an independent cost-information resource. Estimates are based on published national and regional installation averages and are for general guidance only. If you request quotes through our site, we may receive compensation from partner networks — this never affects the price you pay.

← All guides

Cost figures in this guide are compiled from publicly available 2026 U.S. pricing data — including ENERGY STAR, the U.S. Department of Energy, and national contractor cost guides (HomeAdvisor / Angi True Cost) — and are intended for planning only. Prices vary by region, brand, and installation method; always collect 2–3 local quotes.