Weatherproofing Your Windows

The most effective way to stop window drafts is with professional window weatherproofing that seals gaps and strengthens insulation. Common DIY fixes include applying caulk, using weatherstripping, adding window film, or hanging thermal curtains.

Drafts can waste up to 25% of heating energy—schedule window weatherproofing services near you for lasting results.

To keep cold air out, use window insulation film, removable thermal curtains, or draft stoppers. 

For long-term protection, seal cracks with caulk and apply weatherstripping around the frame. Combining these methods provides the most reliable form of window weatherproofing.

Looking for seasonal weatherproofing tips? See our guide on how to insulate your windows for winter.

The best weatherstripping depends on the type of window and the size of the gap. Foam tape is affordable and easy for small gaps, while V-strips or tension seals work well for sashes. For durability, silicone weatherstripping creates a flexible, long-lasting seal.

Start by cleaning the frame so the material adheres properly. Measure the window edges, then cut your chosen weatherstripping to size. Foam tape is best for narrow gaps, while V-strips or silicone strips are ideal for moving parts. Apply firmly, then test that the window still opens smoothly.

Learn more in our guide to weatherstripping doors and windows.

Inspect the frame for cracks, clean away dirt or old caulk, and apply a bead of exterior silicone or polyurethane caulk with a caulk gun. For larger gaps, fill with expanding foam first. Exterior sealing keeps out drafts, water, and pests, extending the life of your window’s weatherproofing.

The cost of window weatherproofing depends on materials, labor, and your window’s condition.

Professional services provide a thorough inspection and sealing plan. Contact your local Mr. Handyman team to request an estimate. Curious about other options? See our guide on how much window replacement costs.

Most weatherproofing materials last 5 to 10 years. Silicone caulk generally outlasts acrylic or latex, while high-quality weatherstripping resists wear longer than foam.

Homeowners in extreme climates may need to refresh seals more frequently. Annual inspections help ensure your window weatherproofing stays effective.

If your windows are structurally sound but drafty, window weatherproofing is usually the most cost-effective choice. If the frames are rotting, the glass is failing, or the energy loss is severe, replacement may be the smarter long-term option.

Learn more about our professional window services to decide which solution is best for your home.

The best time of year for window weatherproofing is early fall, before the onset of cold weather. However, weatherproofing can be done year-round to improve comfort and energy efficiency.

For more seasonal maintenance ideas, see our guide on how to prepare your home for winter.