Skylight Repairs Dublin — Velux & Roof Windows
Bringing Light In Without Letting Water In
A well-fitted skylight is one of the best upgrades you can make to a dark room — an attic conversion, a landing, a north-facing bedroom that never sees direct sun. The problem is that a skylight is also a hole cut deliberately into your roof, and every seal, flashing detail, and drainage channel around it has to keep doing its job for decades without fail.
Mr Roofing repairs and replaces skylights and Velux roof windows across Dublin — leaking units, jammed mechanisms, failed seals, and full replacements. Free inspection, 25-year guarantee, and genuine parts rather than a generic fix that doesn't actually match the unit.
5 Star Rated For Skylight Repairs
Had Mr Roofing replace our roof after storm damage last winter. Brilliant service from start to finish — fair price, tidy team, and excellent workmanship. Highly recommended
Called them out for a chimney repair that two other roofers had ignored. They spotted the problem straight away, explained everything clearly, and had it sorted within a few days.
Got our fascias, soffits and guttering replaced, the difference is incredible. Turned up on time and the finish is perfect. Will definitely be using Mr Roofing again.
What We Actually Fix
Leaking Skylights
Water finding its way in around the frame, through the flashing, or via a blocked drainage channel. We work out which one it actually is before touching anything.
Failed Seals & Gaskets
The rubber seal around the glazing perishes with age and UV exposure, letting in draughts first and water eventually.
Stiff or Broken Opening Mechanisms
Handles, hinges, and chain winders wearing out or seizing — restored to proper, safe operation.
Damaged Flashing
The lead or purpose-made flashing kit around the skylight frame, sealing the join between the window and the surrounding roof covering.
Condensation Issues
Moisture appearing on or around the frame that isn't actually a leak at all — a genuinely different problem with a genuinely different fix.
Full Skylight Replacement
Where a unit's reached the end of its life — usually 20 to 30 years — replacement is often the more sensible option over repeated repairs.
Leak or Condensation? Here's How to Actually Tell
This is the single most common confusion we come across, and getting it wrong means paying for the wrong fix entirely.
Condensation shows up as moisture on the inside face of the glass, or dripping from the bottom edge of the frame — usually worse first thing in the morning or during cold weather, when warm, moist air inside the room meets the cold glass surface. It's the same thing that happens on a car windscreen overnight. This isn't a roof problem at all; it's a ventilation and humidity issue, and the fix is usually about airflow in the room, not the skylight itself.
A genuine leak shows up as staining or water tracking down the plasterboard around the frame, rather than on the glass itself, and it tends to correlate with rain rather than temperature or time of day. This points to a failed seal, damaged flashing, or a blocked drainage channel — an actual roof problem that needs fixing at the roof.
Telling these apart correctly matters, because treating a condensation problem like a leak means paying for flashing work that was never the issue, and treating a leak like condensation means water keeps getting into your roof timber while you're improving ventilation that was never the real problem.
Why Skylights Actually Leak
Weep holes get blocked more often than people realise.
Most roof windows have small drainage channels — weep holes — built into the frame specifically to let any water that does get past the outer seal drain back out rather than pool inside. Dirt, moss spores, and general debris block these over time, and once they're blocked, water that the design was meant to handle safely starts backing up into the frame instead.
DIY silicone is usually a step backward, not a fix.
A very common mistake: someone spots a small leak, runs a bead of silicone sealant around the frame, and the leak seems to stop — for a while. The problem is that sealing over the top traps whatever moisture is already getting in behind it, with nowhere to evaporate out. It often makes the underlying damage worse while hiding the symptom, meaning the eventual proper repair costs more than if it had been looked at correctly the first time.
Dublin's sideways rain finds the gaps other weather doesn't.
A skylight can perform fine in typical rainfall and still leak in the kind of driving, wind-blown rain Dublin's coastal exposure produces regularly — rain that's being pushed sideways under flashing and seals that would otherwise hold. This is often why a skylight that's "never leaked before" suddenly does after one particular storm.
Old units eventually just wear out.
Most roof windows have a genuine lifespan of around 20 to 30 years. If you've needed more than one or two repairs on the same unit, or it's original to an older house, replacement is very often the more sensible long-term option than continuing to patch an ageing frame.
Skylight Repairs Frequently Asked Questions
Is it a leak or condensation?
Condensation appears on the glass itself and tends to correlate with cold mornings; a genuine leak shows up as staining on the plasterboard and correlates with rain. We can confirm which one you're dealing with during a free inspection.
Can I just seal a small leak myself?
We'd advise against it. DIY silicone often traps moisture behind the seal rather than fixing the actual cause, which can make the real repair more extensive later.
How long do Velux and roof windows actually last?
Generally 20 to 30 years. If a unit's needed repeated repairs or is original to an older house, replacement is often the more sensible option.
Do you use genuine Velux parts?
Yes — we use genuine parts to maintain a proper factory-grade seal rather than generic substitutes.
Is skylight work covered by your guarantee?
Yes — every skylight repair or replacement we carry out is backed by our 25-year written guarantee.
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