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Jens Bol
March 31st, 2025
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How to Tell If Your Skylight or Window Is Leaking | Signs to Watch For
Worried about a leaking skylight or window? Learn the common signs of leaks, what causes them, and how to fix the issue before it leads to serious damage.
Leaky skylights or windows can be sneaky. What starts as a small drip can quickly lead to water damage, mould, and even structural issues. Knowing the signs early can help you avoid expensive repairs and maintain a dry, healthy home or building.
At QPC, we’ve helped countless Auckland homeowners and Body Corporates resolve leaking skylight and window issues for good. Here’s what to look out for, what causes it, and what to do if you suspect you’ve got a leak.
Signs Your Skylight or Window Is Leaking
1. Water Stains or Discolouration
Brown stains or dark patches around the interior frame or ceiling are strong indicators that water is getting in. These are often the first visible signs and should never be ignored.
2. Peeling Paint or Bubbling Plaster
Moisture behind your walls can cause paint to peel or bubble. This usually means water is travelling along the wall cavity before showing up inside.
3. Mould or Mildew Smell
Damp smells near your skylight or window could be a sign of hidden leaks. If you spot mould or mildew forming on your ceilings or walls, act fast.
4. Drips or Puddles After Rain
If you notice dripping or small pools of water during or after heavy rain, the source is likely an unsealed window frame or a failed skylight seal.
5. Condensation Between Glass Layers
Double-glazed units that appear foggy or misty may have broken seals. While this isn’t always a water leak, it does indicate failure of your insulation barrier.
Common Causes of Skylight and Window Leaks
Failed Flashings or Sealants
Over time, flashing around skylights or caulking around windows can crack or lift, letting water in.Poor Installation
Incorrect placement or inadequate waterproofing details can cause problems from day one.Blocked Gutters or Roof Valleys
Water overflowing can find its way into vulnerable areas around roof penetrations like skylights.Aging Frames or Glass
Older timber joinery or poor-quality frames can rot or separate, creating gaps.
How QPC Fixes Skylight & Window Leaks
We don't just patch things up — we fix the problem at the source. Here's how:
Thorough inspection using moisture meters and visual checks
Resealing or replacing faulty joinery and flashings
Roof and cladding repairs if the leak comes from above
Installation of new skylight systems or double-glazed units if needed
Reporting for insurance claims or Body Corporate records
Where These Leaks Typically Occur
Skylights on low-pitched roofs
Timber-framed windows in older homes
Joinery facing the prevailing wind and rain
Second-storey windows near eaves or parapets
If your building fits any of these criteria, regular checks can help you avoid disaster.
Why Choose QPC?
✔ Over 50 years of combined experience
✔ Trusted by Body Corporates and property owners across Auckland
✔ Fast inspections with honest advice
✔ Clear reporting and targeted repair solutions
✔ We handle everything — leak detection to full repair
Frequently Asked Questions
Ready To Fix Your Leak?
Whether it’s a leaky roof, structural issue, or full renovation — we’re here to help. Reach out today for expert support and practical solutions.
