What to Do When Your Milgard Window Leaks
What to Do When Your Milgard Window Leaks
A leaking window is never fun to discover — whether it's water pooling on the sill during a Bay Area storm or a foggy haze creeping between the panes. If you have Milgard windows and you've spotted a leak, don't panic. Here's a clear, step-by-step guide to figuring out what's going on and getting it fixed.
Step 1: Check Your Warranty
Before you do anything else, find out whether your windows are still under warranty — this determines your fastest and often most affordable path to a fix.
Milgard offers one of the strongest warranties in the window industry, but the coverage depends on a few factors:
Original owner, owner-occupied home: Milgard windows typically carry a Full Lifetime Warranty covering parts and labor for as long as you own and live in the home.
Subsequent (new) homeowner: If you bought a home that already had Milgard windows installed, the warranty is generally transferable but converts to a 10-year limited warranty from the original manufacture date, rather than a lifetime term.
Glass breakage coverage: Depending on the product series (for example, Tuscany vs. Trinsic), glass breakage may or may not be included automatically — sometimes it's an optional upgrade purchased at the time of sale.
To check your coverage:
Locate your window's permanent identification/serial number, usually etched or printed in a corner of the glass unit or on the frame.
Gather your proof of purchase or closing documents if you're a subsequent homeowner.
Visit Milgard's warranty information page or contact a Milgard Certified Dealer with your product ID to confirm your exact coverage and whether the type of leak you're experiencing is included.
Keep in mind that damage from improper installation, natural disasters, or structural settling is generally excluded, even under a lifetime warranty — so it's worth understanding what your specific leak is likely caused by before filing a claim.
Step 2: Figure Out What Kind of "Leak" You Actually Have
Not all window leaks are the same, and the fix depends on the cause:
Condensation between the panes (a foggy or hazy look): This usually means the seal on the insulated glass unit has failed and the argon gas or air pocket has been compromised. This is a glass unit issue, not a frame issue, and is often covered under warranty.
Water intruding around the frame: This is typically caused by a failed exterior seal, flashing, or caulking issue rather than the window itself — often tied to installation or the surrounding wall assembly.
Water pooling on the interior sill: This can be condensation from indoor humidity meeting a cold glass surface, or it can be actual water intrusion from outside. Wipe it dry and monitor after the next rain to see if it returns and from where.
Step 3: Document the Problem
Take clear photos of the leak, the affected glass or frame area, and the interior damage (if any). Note the date, weather conditions, and how the water is entering. This documentation speeds up both warranty claims and repair estimates.
Step 4: Contact a Certified Dealer or Local Glass Professional
If your windows are under warranty, a Milgard Certified Dealer can file the claim and coordinate repair or glass replacement on your behalf. If your warranty has expired, or the issue is with the surrounding frame or installation rather than the glass unit itself, a local glass and window specialist can diagnose the issue and handle the repair directly.
Step 5: Repair vs. Replace
Depending on the cause:
A failed seal on the glass unit usually means replacing just the insulated glass unit (IGU), not the entire window.
Frame or flashing issues may require resealing or re-flashing around the window rather than glass work.
Older or significantly damaged windows may be more cost-effective to replace outright, especially if leaks have caused wood rot or other structural damage nearby.
We Can Help, Warranty or Not
At San Mateo Glass and Mirror, we work with homeowners across the Peninsula and greater Bay Area on window repair, glass unit replacement, and full window replacement — whether your Milgard windows are still under warranty or not. We can help you diagnose the source of a leak, advise on the most cost-effective fix, and get it handled quickly before it leads to bigger issues like water damage or mold.
If you've spotted a leak, don't wait — contact San Mateo Glass and Mirror today for a free evaluation.