Skylight Leak Repair in Toronto & the GTA

Water at a skylight shows up three ways: drips during heavy rain, drips during a winter thaw, and mystery moisture on calm cold mornings. Each points somewhere different — and the difference decides whether you need a flashing repair, an ice dam conversation, or no roof work at all. Plenty of "skylight leaking" calls turn out to be condensation, which is a ventilation and insulation problem wearing a leak costume.

Real leaks at skylights are almost always the skylight flashing, not the glass. Step flashing that was cut short, a head flashing buried under debris, sealant that gave up after a decade of freeze-thaw, or shingles above the unit lifting in wind — water gets in at those points and travels the shaft framing, so the drip inside is rarely under the actual entry point. We open the area properly, find where water gets past the flashing, and rebuild that detail with membrane behind it.

Repair is worth doing when the unit itself is sound: clear glass, intact seal, a model that is not thirty years old. If the pane is fogged, the frame is rotting, or the skylight is an old acrylic dome, we will say plainly that repair money is better put toward replacement — resealing a dead unit buys one season, and you pay for access twice. The quote tells you which side of that line yours is on.

• Leak diagnosis at the unit — flashing, seals, weep holes and the roof above it
• Honest condensation-versus-leak assessment before any roof surgery
• Rebuilding step, head and sill flashing with new membrane underneath
• Resealing frame joints and glass gaskets where the manufacturer allows it
• Replacing cracked or wind-lifted shingles immediately around the skylight
• Clearing debris dams above the unit that pond water against the head flashing
• Checking and clearing the unit's condensation weep channels
• A written note on remaining unit life, so you know when repair stops making sense

• Whether the fix is sealant-level, a partial flashing repair or a full re-flash with membrane
• Roof pitch and height — steep or three-storey access adds time and safety setup
• Shingle condition around the unit; brittle old shingles complicate lifting and re-laying
• Age and brand of the skylight, which decides if matching parts still exist
• Number of skylights being repaired in the same visit
• Winter conditions — snow and ice have to be cleared before diagnosis is even possible
• Whether interior staining needs a drywall touch-up after the source is fixed

Every home is different, so we don’t publish flat prices — the quote is free and based on your actual job.