Licensed Balcony Waterproofing in Sydney
Balcony Waterproofing
Careful prep, flexible membranes, leaks stopped.
We diagnose the cause first, then seal it for good. Crack and screed repair, primer and a flexible membrane bonded to the floor and upturns, backed by a written workmanship warranty.
20 Years
In Business
Sydney Metro
Sydney Metro Coverage
Fixed-Scope
Quoting
Same-Week
Availability
What we do
Our balcony waterproofing solutions
Balcony waterproofing creates a seamless barrier that stops water entering the slab and damaging the structure below.
Our Sydney technicians clean the surface, repair cracks and damaged screeds, apply primer, then roll or spray a flexible membrane that bonds to the balcony floor and upturns. The result is balcony waterproofing Sydney homeowners and strata managers can rely on through heat, storms and the constant movement Sydney balconies go through.
Every job starts with diagnosis, not guesswork. We find why the water is getting in, then build the right balcony waterproofing membrane system around that cause, so a small leak today does not become a structural repair later.
Stops water at the slab
A bonded membrane keeps water out of the concrete, tiles and the rooms underneath.
Licensed and warranty-backed
NSW licensed work with a written workmanship warranty.
Protects property value
A sealed, compliant balcony is one less defect on the building.
Built for movement
Flexible membranes flex with temperature change instead of cracking.
Diagnosis first
The balcony waterproofing process
Five stages, every job. Each one is signed off before the next begins.
Problems we fix
Cracked grout, lifting tiles, failed membranes
Cracked grout and lifting tiles let water soak into the slab, where it causes rust, damp patches and interior damage. Left alone, a slow leak becomes peeling paint, water stains and eventually concrete and structural deterioration.
Our team removes the failed material, repairs the screed, and installs a flexible balcony waterproofing membrane that seals the surface and protects the structure. Where the surface allows it, we can carry out balcony waterproofing without removing tiles, which keeps cost and disruption down. We confirm whether that suits your balcony at the inspection.
We also handle the related work in the same visit: caulking and sealing, crack repair, leak repair and remedial waterproofing.
Choosing the right system
Waterproofing membrane comparison
Not every balcony needs the same membrane. Here is how the two main options compare for Sydney conditions.
Rigid
Cementitious membrane
A rigid coating best suited to low-movement areas and certain substrates.
- Strong on stable, low-movement slabs
- Good under-tile option where movement is minimal
- Less forgiving when the balcony flexes
Recommended for most balconies
Polyurethane liquid membrane
A flexible, seamless membrane ideal for Sydney balconies that move with temperature change.
- Highly flexible, moves with the balcony
- Seamless across the floor and upturns
- Our default for exposed Sydney balconies
Not sure which suits your balcony? Read our practical guide to choosing a balcony membrane, then we confirm the right system at inspection.
Already leaking?
Leaking balcony repairs
If water is already getting in, the fix starts with finding out why.
Most leaks trace back to a failed membrane, movement in the slab, cracked grout or poor drainage. Our leaking balcony repairs begin with a proper diagnosis so we fix the cause, not just the symptom. Patch jobs that only cover the surface tend to leak again the first time the balcony moves.
Need the source pinpointed first? We also offer balcony leak detection to find exactly where water is tracking before any repair begins.
Failed membrane
Aged or poorly installed membranes that have stopped sealing.
Movement cracks
Slab and joint movement that has cracked grout and the membrane.
Poor drainage
Incorrect falls and outlets letting water pool and track in.
Lifting tiles
Loose or drummy tiles exposing the surface beneath.
Licensed & compliant
Licensed work, built to standard
Our experts hold the required NSW waterproofing licences, so you get licensed balcony waterproofing Sydney property owners can trust. External balcony membranes are installed in line with the relevant Australian Standard for external above-ground waterproofing, AS 4654, which covers exposed areas like balconies, terraces and decks.
That matters because a balcony is not a bathroom. It is fully exposed, it moves, and it usually sits over a habitable room or garage, so getting the membrane, the falls and the detailing right is what keeps the space below dry.
Answers
Balcony waterproofing FAQ
The common signs your balcony needs waterproofing are cracked grout, lifting tiles, peeling paint, bubbling, and water stains or damp patches, either on the balcony or on the ceiling of the room below. If you can see any of these, it is worth having the balcony inspected before the water reaches the slab.
No. Tiles and grout are a wearing surface, not a waterproof layer. The waterproofing is the membrane underneath. When people ask are tiles enough to waterproof a balcony, the honest answer is that water passes through grout joints over time, so a balcony relies on the membrane below the tiles to stay dry.
Yes. A leaking balcony can damage the apartment below, which is one of the most common reasons balconies become a strata issue. Water tracks through the slab and shows up as stains, damp or paint damage on the ceiling and walls underneath, and left unchecked it can reach the structure.
Often, yes. Where the existing tiles are sound and the substrate is in good condition, balcony waterproofing without removing tiles is possible using a suitable topical membrane, which saves time and cost. We confirm whether your balcony is a candidate at the inspection, because it depends on the condition underneath.
How long does balcony waterproofing take depends on the size and condition of the balcony and how much repair the surface needs. Most residential balconies are completed within a few days, including preparation, membrane application and drying. We give you a clear timeframe with your quote.
The balcony waterproofing cost depends on the size of the balcony, the condition of the surface, how much crack and screed repair is needed, and the membrane system used. Rather than a guess, we provide a fixed-scope quote after inspecting the balcony, so you know the scope and the price before any work starts.
Yes. External balcony membranes are installed in line with AS 4654, the Australian Standard for waterproofing membranes for external above-ground use, which is the standard that applies to exposed areas like balconies and terraces. Our work is carried out by NSW licensed waterproofers.
Yes. Every balcony project includes a written workmanship warranty, subject to site and product conditions. We confirm the warranty details in writing with your fixed-scope quote.
From our knowledge base
Balcony waterproofing tips
From our knowledge base
Balcony waterproofing tips
Tell us what is happening with your balcony and we will arrange an inspection.
Prefer to talk it through? Call 1300 488 660. Same-week availability across Sydney metro.
