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Roof leak detection and repairs in Melbourne

The stain on your ceiling is rarely under the hole in the roof. We trace the water back to where it gets in, show you the cause and repair that spot.

Updated 8 October 2026

Water staining on roof timbers inside a roof space from an old leak

Leaking right now? Do this first

Call 0430 545 669
  1. Catch the drip. Put a bucket under it and lay towels around it. Move rugs and furniture clear.
  2. Watch for power. If water is near a light or power point, or the ceiling is bulging, switch the power off to that area at the switchboard and keep out of the room.
  3. Take photos. Photograph the stain, the drip and any damage. Note when it started and whether it only leaks in rain.
  4. Stay off the roof. A wet roof is slippery, and the entry point is rarely above the stain.

Then call 0430 545 669. If you plan to claim, tell your insurer early.

The short answer

Roof leak detection traces water from the ceiling stain back to the point where it enters the roof. We check the roof space, then walk the roof and test the likely sources: tiles, ridge pointing, valleys, flashings, penetrations and gutters. We repair the entry point, not just the stain.

How we find a leak

Water runs along battens, rafters and sarking before it drips. The stain can sit a metre or more from the hole. So we follow it:

  1. Ask the questions. Does it leak in any rain, only in wind-driven rain, or only after a long wet spell? Which room, and for how long? The answers narrow the field.
  2. Check the roof space. We look for staining on timbers, wet insulation and light coming through. Old stain lines tell us where water has been before.
  3. Walk the roof. We check tiles, ridge pointing, valleys, flashings, vents, antennas, solar fixings and gutter edges.
  4. Test where we need to. If the cause is not obvious, we use water to test sections from the bottom up until the leak shows.
Water staining on roof timbers inside a roof space from an old leak
Water staining on roof timbers in a roof space, showing where a leak has run.

The usual causes

Flashing repair at the base of a tile roof valley using membrane flashing
Membrane flashing repair at the base of a tile roof valley.
Water running out of a rusted gutter corner joint above a window
A rusted gutter corner joint leaking above a window.

Is it a leak or condensation?

Our guide to leak or condensation sets the signs side by side. Condensation forms when warm indoor air meets a cold surface. It shows up on cold mornings, with damp patches, mould and drips under the roof, and it does not depend on rain. A leak follows the weather. If your ceiling is damp on dry days, ask us about ventilation. A whirlybird or roof vent can help.

What customers tell us

People who have a leak want two things: a fast reply and a straight answer. These reviews are from leak jobs:

“I highly recommend them they are very quick to respond came within 30 minutes had a quote that night. Fixed the leak the following day. It was the best experience I’ve had with a company in many years.”

LeviGoogle review

“Nathan fixed the roof leak damage on our garage and did an excellent job. He came by the same day to check it out, explained everything clearly, and gave us a quote same day.”

Herin DomadiaGoogle review

“Contacted a few places for roof leaks. O’Malley roofing provided prompt feedback with clear pricing. Arrived within the time suggested and the photos of the fix look so much cleaner compared to the previous work. Will be using again for all jobs going forward. Thanks!”

Taryn GGoogle review

Temporary protection

If water is coming in now, put a bucket down, move furniture and photograph the damage for your insurer. We can make the roof safe first and repair it when the weather clears. See emergency repairs for what to do while you wait.

Have a leak? Not sure what you need? Describe it on the form or call 0430 545 669. We will tell you straight.

Questions about leak detection and repairs

Where is the leak if the stain is in the middle of the ceiling?

Probably higher up the roof and to one side. Water follows the framing before it drips. We trace it from the stain upslope to find the entry.

Can you fix a leak in the rain?

We can make it safe in the wet. A proper repair needs dry surfaces, so we plan the permanent fix for when the weather allows.

How long does leak detection take?

Often under an hour for an obvious cause. Hard-to-find leaks take longer, and sometimes need water testing in stages.

Do you give a price before the work?

Yes. You get a clear quote before we start, and we tell you if we find something extra on the day.

Will the ceiling stain go away?

The roof repair stops the water. Ceiling repair and painting is a separate job. We tell you what damage we see so you can plan for it.

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