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Balcony & terrace leaks

Balcony & Terrace Leak Detection in Sydney

A leaking balcony usually shows up as a stain in the room below. We trace the water back through the tiles and membrane to where it’s really getting in.

Balcony & terrace leaks

The stain is downstairs, the leak is up top

Tiled balconies and terraces take a beating from sun and rain, and the waterproofing membrane under the tiles is what fails first. When it does, water tracks into the room or ceiling below.

We trace where water is entering and how far it’s travelled, so the repair targets the real failure — not just the spot where the stain appeared.

Inspecting a tiled Sydney balcony for a waterproofing leak
The problem

Signs your balcony is leaking

Often the first sign is inside, not on the balcony itself.

A stain in the room below

Discolouration or damp on the ceiling or wall under the balcony.

Bubbling paint underneath

Paint blistering or render crumbling on the soffit below the balcony.

White salt deposits

Efflorescence along the balcony edge or on the ceiling below.

Drummy or lifting tiles

Hollow-sounding or lifting tiles mean moisture under the membrane.

Pooling water

Water sitting on the balcony instead of draining away.

Cracked grout or perimeter

Gaps in grout or at the door threshold and edges.

Failed balcony waterproofing membrane under tiles
What’s behind it

What’s behind a balcony leak

Balcony leaks almost always come back to the waterproofing.

  • A failed or aged membrane under the tiles.
  • Cracked grout or a failed perimeter and door threshold.
  • Poor fall or blocked drainage letting water pond.
  • A failed junction where the balcony meets the wall or door.
  • Movement and thermal expansion opening joints.
How we find it

We trace it back to the source

We find where water enters and how far it travels, without ripping the balcony up on a guess.

  • Map from below and above — moisture readings on both sides show the path the water takes.
  • Image the membrane — thermal imaging reveals where the wet area sits under the tiles.
  • Test to confirm — targeted testing proves the exact entry point.
  • Report the findings — a clear result for your repairer, strata or insurer.
Non-invasive, no demolitionMoisture mappingThermal imagingTargeted testingWritten report
Upfront pricing

A clear price before we start.

Every inspection starts at a fixed first-hour rate, confirmed with you before any work. No call-out surprises, and no obligation to proceed with a repair.

  • $299 inc GST for the first hour on site.
  • A fixed price agreed before we start.
  • A written findings report for strata or insurance.
Typical inspectionIncluding the first hour on site
$299 inc GST

Fixed first hour on site · confirmed before we start

  • No-dig, non-invasive detection
  • Thermal imaging & moisture mapping
  • The leak located and explained
  • A clear written findings report

Guide pricing only. We confirm a fixed price before any work starts — no surprises.

Questions, answered

Balcony leak detection — FAQs

Why is the leak showing up inside and not on the balcony?
Because the membrane under the tiles has failed and water is tracking into the structure, appearing in the room or ceiling below before you see anything on the balcony itself.
Do you have to remove the tiles to find it?
Usually not to locate it. Moisture mapping and thermal imaging pinpoint the failure first, so any repair is targeted.
Is this a strata matter?
Often, for apartments and units. We provide a clear report you can take to the owners corporation or insurer.
What does it cost?
Our first hour on site is $299 inc GST, confirmed before we start.

Balcony leaking into the room below?

Book an inspection and we’ll trace it back to where the water is really getting in.