Window Leak Repair in Seattle & the Eastside
Water leaking around windows is one of the most common — and most damaging — building envelope failures we see in the Seattle area. Homeowners often notice staining, bubbling drywall, drafts, or water appearing inside during heavy rain.
In many cases, the leak isn’t the window itself — it’s a flashing or waterproofing failure behind the siding.
What’s Happening
Window leaks typically occur when water bypasses the exterior cladding and enters the wall assembly. This can happen slowly over time or suddenly during wind-driven rain.
Common signs include:
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Water stains below or beside windows
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Soft drywall or trim
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Musty odors
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Exterior siding deterioration
Why Window Leaks Are Urgent
Water entering the wall cavity can cause:
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Hidden rot and structural damage
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Mold growth
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Insulation failure
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Expensive repairs if left unresolved
Quick action often means smaller, more targeted repairs.
How Synapse Construction Fixes Window Leaks
We specialize in building envelope diagnostics and repair, not just surface fixes.
Our process includes:
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Selective siding removal
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Inspection of window installation and flashing
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Installation of proper head flashing and waterproof membranes
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Repair or replacement of damaged materials
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Reinstallation and finishing to match existing exterior
We fix the cause — not just the symptom.
What We Commonly Find
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Missing or improperly installed head flashing
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Failed WRB (weather-resistive barrier)
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Water directed into walls by roof or gutter details
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Older window installations that don’t meet current standards
Recent Window Leak Repairs
Service Areas
Seattle Neighborhoods • Eastside Communities • Greater Puget Sound Area
Schedule a Window Leak Assessment
If you’re seeing signs of a window leak, it’s best to investigate early. If the source of the leak is obvious, targeted window leak repair may be appropriate. If the source is unclear or recurring, an inspection-first approach is often the safest next step.
Contact Synapse Construction to schedule a professional water intrusion assessment and repair.
