How to Reseal Windows 🪟 – Stop Drafts and Save Energy

Resealing windows is one of the simplest, most effective ways to cut energy costs and fix cold drafts.

Windows play a big role in keeping your home comfortable year-round. Over time, seals can wear down, letting in drafts, moisture, and even pests. Knowing how to reseal windows is essential if you want to save on energy bills and extend the life of your windows.

Why Window Seals Fail

Before diving into the fix, it helps to understand why seals fail. Common causes include:

• Age and wear of caulk or weatherstripping.

• Seasonal expansion and contraction of frames.

• Poor original installation.

• Exposure to moisture and sun.

If you’ve noticed a chill near the glass, you’re not alone—learning how to fix drafty windows is a common homeowner concern.

Step-by-Step: How to Reseal Windows

Step	What to Do	Tools Needed
1. Inspect	Look for cracks, gaps, or peeling sealant.	Flashlight, small mirror
2. Remove Old Sealant	Scrape off damaged caulk or weatherstripping.	Utility knife, scraper
3. Clean Surface	Wipe with rubbing alcohol for adhesion.	Cloth, cleaner
4. Apply New Sealant	Use exterior-grade caulk around edges.	Caulk gun
5. Add Weatherstripping	For movable sashes, add adhesive foam strips.	Weatherstripping, scissors

“A good reseal can reduce energy loss by up to 30% according to Energy Star—proof that a little DIY goes a long way.”

How Much Does It Cost?

Resealing is affordable compared to window replacement.

• DIY resealing: $15–$50 in supplies.

• Professional resealing: $100–$300 per window, depending on damage.

If moisture damage has already spread, you may also need related fixes like fascia or siding work. For example, our guide on wood siding types shows how siding affects long-term protection.

Prevention Tips

• Inspect window seals every spring and fall.

• Replace weatherstripping every 2–3 years.

• Keep gutters clear to avoid water pooling near frames.

• Watch for condensation between panes, a sign of failed seals.

For more energy efficiency upgrades, check our breakdown of standard shower mixer height to better understand how small details in installations can make a big difference.

Pros and Cons of Resealing Windows

Pros:

• Low cost compared to replacement.

• Immediate energy savings.

• Quick DIY project for most homeowners.

Cons:

• Not a permanent solution if frames are rotted.

• May need redoing every few years.

“Think of resealing as routine maintenance—just like replacing HVAC filters or cleaning gutters.”

Conclusion

Knowing how to reseal windows keeps your home draft-free, energy-efficient, and comfortable. While it’s not as dramatic as a full replacement, resealing is a cost-effective way to stop heat loss and fix those chilly winter drafts. A few hours of work today can save you hundreds on energy bills tomorrow. 🏡✨

FAQ

How to reseal windows? Remove old sealant, clean surfaces, and apply new exterior-grade caulk or weatherstripping.

How to fix drafty windows? Add weatherstripping or reseal gaps with caulk to block air leaks.

How often should I reseal windows? Every 3–5 years, or when you notice drafts or cracked caulk.

Does resealing increase home value? Yes, energy-efficient upgrades improve comfort and appeal to buyers.