A leaky window can stain drywall, swell trim, and raise energy bills. The good news is that most leaks have simple causes. With a quick check outside and a few basic fixes, we can stop the water and protect your home.
Below, we share what fails, what you can do now, and when it is time to replace. We base this on what we see every week in the field. Use these steps to spot issues early and avoid bigger repairs later.
What Causes a Leaky Window?
Water gets in through small gaps, worn parts, or blocked drains. Regular maintenance is the number one way to prevent problems.
Signs You Can Spot Fast
- Water stains on the wall or sill after rain
- Soft or dark wood around the frame or sill nose
- Drafts or musty smells near the opening
- Cloudy glass that never wipes clean
Common Failure Points We Find
- Cracked or shrunken caulk around the exterior
- Rot in the sash, where glass meets wood
- Casement windows that sag, so weatherstripping no longer seals
- Bent or missing flashing above the unit
- Clogged weep holes in vinyl frames that let water spill back inside
Pro Tip: Do a quick exterior walkaround twice a year. Look for cracked caulk, soft wood, bent flashing, and blocked weep holes. Five minutes now can stop hours of repair later.
How Do You Fix Common Leaks?
Start with the easy, low-cost steps. Most take basic tools and a ladder.
Clean and Open Weep Holes
Use a small brush or plastic pick to clear dirt from the slots along the bottom of vinyl frames. Flush with a cup of water to confirm flow to the outside.
Recaulk Small Gaps
Cut out loose or cracked beads. Wipe clean and dry. Apply a fresh, paintable exterior-grade sealant in a smooth, continuous line.
Tune Casement Hardware and Weatherstripping
Tighten hinges, square the sash, and check lock points so the seal compresses evenly. Replace worn weatherstripping if it is brittle or flat.
Key Takeaway: Simple maintenance fixes most small leaks fast. Clean drains, renew sealant, and make sure the sash closes square and tight.
Repair or Replace: How We Decide
Not every problem needs new windows. We use a clear checklist to guide you.
When Repair Makes Sense
- Small gaps that seal with new caulk
- Minor sash alignment on a casement
- Clearable weep holes on vinyl units
- Intact frames with no deep rot
When Replacement is Smarter
- Rotten sill noses or widespread wood rot
- Casements that sag or will not close and lock
- Dual pane glass that stays milky from failed seals and lost argon
- Old double hungs that will not operate or leak air in hot or cold seasons
- Single-pane glass with storm panels that offer poor efficiency
Pro Tip: If the glass is cloudy between panes and never clears, the seal has failed. The unit has lost insulation value. Replacement glass or a full window upgrade will restore efficiency.
Need expert help with a leaky window? Contact Energy Pro for a free consultation. We will inspect, test for water entry, and give you clear options and pricing.
What Happens During a Professional Visit?
We follow a simple process so you know exactly what to expect.
Step 1: Exterior Inspection
We check caulk lines, wood condition, flashing, and siding contact. We look for stains and entry paths.
Step 2: Operation and Seal Test
We open and close the window, check squareness, and inspect weatherstripping and locks.
Step 3: Drain and Water Check
We confirm clear weep holes on vinyl units and may perform a safe, controlled water test.
Step 4: Clear Plan and Estimate
You get a written plan that lists repairs or replacement options. We explain the benefits of comfort, durability, and energy savings.
Why Timely Action Pays Off
Small leaks grow into big repairs. Early fixes protect trim, drywall, and flooring. Modern replacement windows also raise comfort and lower heating and cooling costs.
Key Takeaway: Act at the first sign of trouble. Fast repairs cost less, and smart upgrades pay you back in comfort and lower bills.
Ready to Stop the Leaks Today?
We can diagnose the exact source, fix minor issues on the spot, or design a replacement that fits your goals and budget. Schedule your Energy Pro inspection now and get a clear plan to solve your leaky window issues for good.
