7 Most Common Problems with Skylights: How to Fix Them

Whether you’re a homeowner admiring the extra light or a tradesperson dealing with the aftermath, skylights can be both a blessing and a headache. When they work, they’re magic – but when something goes wrong, that magic wears off fast.

We’ve been in the roof window game for over 15 years, and we’ve seen the same issues crop up time and time again. Here are the most common skylight problems – and what you can do about them.

1. Skylight Leaks

The Problem

This is the big one. A leaking skylight is one of the most common (and most dreaded) problems people run into.

What Causes It

• Failed sealant
• Damaged or incorrectly installed flashing
• Cracks in the skylight pane or frame

The Fix

Clean the area and reseal with exterior-grade silicone. If flashing is warped or missing, it needs to be replaced. For recurring leaks, full skylight replacement may be your best bet. If you’re unsure which option’s right, start with our guide to choosing the right roof windows.

2. Condensation Build-Up

The Problem

Moisture collecting inside your skylight – especially in winter – can look like a leak but isn’t.

What Causes It

• Lack of ventilation
• Inadequate insulation around the window frame
• High interior humidity

The Fix

Install a vent nearby, or improve airflow in the room. Insulating the area around the skylight frame can also reduce cold bridging.

3. Cracked or Foggy Glass

The Problem

Skylights can crack due to impact (hail, debris, kids being kids). And if you’ve got double glazing, fogging can mean seal failure.

What Causes It

• Physical damage
• Thermal stress
• Old or low-quality glazing

The Fix

Unfortunately, cracked panes or failed seals mean replacement is usually necessary. Consider upgrading to tougher, thermally efficient glazing – we’ve got plenty of options, and you can even order best selling roof windows in the UK directly from our website.

4. Sticking or Jammed Skylights

The Problem

You go to open the window – nothing. It’s stuck, stiff, or worse, won’t shut fully.

What Causes It

• Dust and dirt in the mechanism
• Warped frame due to moisture
• Broken handle or locking system

The Fix

Clean the hinges and tracks thoroughly, then lubricate them. If parts are rusted or damaged beyond repair, replacements may be needed. Don’t force it – this can cause worse damage.

5. Discolouration Around the Frame

The Problem

Dark patches, bubbling paint, or even mould appearing on the wall or ceiling around your skylight.

What Causes It

• Minor leaks
• Poor insulation
• Condensation over time

The Fix

You’ll need to tackle both the symptom and the source. Clean the area, repaint if necessary, and address insulation or sealing issues to stop it from returning.

6. Noise from Wind or Rain

The Problem

Some skylights whistle in the wind. Others amplify every drop of rain like a drum.

What Causes It

• Gaps in installation
• Poor acoustic insulation
• Low-quality materials

The Fix

Check seals and flashing. For future upgrades, opt for double- or triple-glazed roof windows with sound insulation – especially if you're in a windy or rainy part of the UK (so, most of it).

7. Fading Furniture or Flooring

The Problem

Sunlight is great – until it starts bleaching your sofa.

What Causes It

UV exposure through non-filtering glass

The Fix

Install blinds, films, or upgrade to UV-protective glazing. Many modern roof windows come with this as standard.

Final Thoughts

Skylights can transform a room, but they also come with their quirks. Regular maintenance, high-quality products, and a little know-how go a long way toward avoiding problems.