Skylight condensation is usually about humidity and ventilation, not a leak. Here's how to tell the difference and fix the drips in NZ homes.
Drips from a skylight on a cold morning are alarming, but they're often condensation, not a leak. Warm, moist indoor air meets the cool glass and forms water. Here's how to tell which it is and how to fix it.
Condensation or Leak?
Condensation appears as even misting or droplets on the inside glass and frame, worst on cold mornings and in humid rooms like kitchens and bathrooms. A leak appears during or after rain, often stained, and tracks from the frame edges. If it's the latter, see our skylight leak content via our repair team.
How to Fix Condensation
Reduce indoor humidity with extractor fans, ventilation and dehumidifying, especially in kitchens and bathrooms below skylights. This solves most cases. Better-insulated, double-glazed skylights and well-insulated shafts resist condensation far better than old single-glazed units.
- Run extractor fans in wet rooms
- Improve household ventilation
- Insulate the skylight shaft
- Upgrade to double-glazed units
- Clear any blocked weep channels
When to Upgrade
Old single-glazed domes condensate readily. If yours fogs constantly, upgrading to a modern double-glazed skylight is a lasting fix — see our Velux vs dome skylights guide. We assess whether ventilation, insulation or replacement is the right answer.
Frequently Asked Questions
Is skylight condensation a leak?
Usually not. Condensation mists evenly on the inside glass on cold mornings; a leak appears with rain and tracks from the frame, often stained.
How do I stop skylight condensation?
Reduce indoor humidity with extractor fans and ventilation, insulate the shaft, and consider upgrading to a double-glazed unit.
Why does my skylight drip in winter?
Cold glass plus warm, moist indoor air forms condensation. It's worst in winter and in humid rooms like kitchens and bathrooms.
Do double-glazed skylights condensate?
Far less. The inner pane stays warmer, so condensation is greatly reduced compared with single-glazed domes.
Every roof and property is different, so the most reliable next step is an on-site assessment. Our registered, insured Auckland team gives free no-obligation inspections and clear written quotes — repair where repair makes sense, replacement only when it is genuinely better value. Call 022 501 9921 or visit our Roof Repair Auckland page, or book a free inspection online.
Topics covered
- skylight condensation nz
- skylight dripping
- stop skylight condensation
- skylight fog
- skylight moisture fix