Leaking Balcony Repairs & Waterproofing Sydney
Water in the unit below, drummy tiles, pooling that never dries. We find where it is getting in and seal it permanently — on most balconies, without lifting your tiles.
- 5.0 ★
- 86 Google reviews
- $1,499 – $6,000
- 5-year warranty
Get your balcony looked at
Tell us what you are seeing and Ray will call you back. Free on-site inspection, and a fixed written price before anything starts.
- We find the leak firstTraced and photographed on site, so you are paying to fix the cause and not the stain.
- Usually no tiles removedResin and epoxy injection seals the substrate through the tiles you already have.
- A fixed written priceItemised after the inspection. No hourly rates, no surprises on the day.
- Open 7 days, 24-hour emergency responseWater does not wait for business hours, so neither do we.
Signs your balcony is leaking
A balcony fails from the top down, and by the time anyone notices, the water is usually somewhere it should not be. These are the six things we get called out for most.
Water in the room or unit below
The one that gets a strata manager involved. A wet patch on somebody else’s ceiling means the membrane has been gone for a while.
Water pooling after rain
It should drain and dry. If it sits, the falls are wrong or the drain is blocked, and standing water finds every weakness there is.
Drummy or lifting tiles
Tap them and they sound hollow. Water underneath has broken the bond between the tile and the bed below.
Efflorescence — white chalky residue
Salt left behind as water moves through the concrete and evaporates. It is proof water is travelling inside the slab, not just sitting on it.
Cracked or missing grout
Especially along the perimeter and where the balcony meets the wall. That junction is where most balconies let go first.
Rusting balustrade fixings
Water getting in around the posts, then sitting against the steel. Left alone it becomes a structural problem, not a waterproofing one.
Sealed through the tiles you already have
The conventional balcony repair is demolition: tiles up, screed out, new membrane, new tiles. It is the right answer when the falls are wrong or the slab has gone — and the wrong answer, at several times the price, when they have not.
Our resin injection system goes in through the existing grout lines, travels into the cracks and voids in the substrate, and cures into a continuous sealed barrier. Most balconies we repair never lose a tile.
The leak is traced first
Cracked grout, a perished membrane, blocked drainage, a bad tile-to-wall junction or a balustrade penetration. We find which, and photograph it, before quoting.
AS 4654 where a membrane is needed
When a balcony does need remembraning, it goes in to the Australian Standard for external above-ground waterproofing, with the falls corrected so water actually leaves.
5 years, in writing
A 5-year workmanship warranty on every balcony we waterproof, supplied with your invoice. If it leaks again inside that period, we come back.
Injection is not always the answer. If the structural falls run the wrong way or the slab itself has failed, resin will not hold it — and we will show you why before recommending the bigger job rather than after.
When the balcony is common property
Half the balcony calls we take start with someone being told the balcony is not theirs to fix. That is not a dead end — it just changes who signs.
A written report
We inspect, identify the leak source and photograph it, and put it in writing — the document an owners corporation actually needs before it can approve work.
We quote whoever is signing
The owner, the landlord, the building manager or the strata manager direct. You do not have to sit in the middle relaying it.
One balcony or the whole block
Same crew, same warranty. For multi-unit work we report on every balcony so the committee can see what needs doing now and what can wait.
What a balcony job covers
Which of these yours needs comes out of the inspection. Most balconies are two or three of them, not all six.
Leak detection and reporting
We trace the entry point and photograph it. For strata jobs that becomes a written report the owners corporation can act on.
Resin injection sealing
Injected through the existing grout lines into the substrate below, curing into a sealed barrier — on most balconies, without lifting a tile.
AS 4654 compliant membranes
Where a balcony does need a new membrane, it goes in to the Australian Standard for external above-ground waterproofing, with the falls corrected.
Regrouting and epoxy grout
Perished grout raked out and replaced, with epoxy grout where the joint needs to stop moving for good.
Perimeter and junction sealing
The tile-to-wall junction, the door threshold and the balustrade penetrations — where balconies actually leak.
Drummy and cracked tile repair
Loose tiles lifted, re-bedded and re-grouted so the surface is sound before anything is sealed over it.
$1,499 – $6,000
That is the honest range for a Sydney balcony repair. A balcony caught early — grout going, a bit of pooling — sits at the bottom of it. One that has been wetting the ceiling below for two years sits at the top, because by then there is more to put right.
Either way you get a fixed written price after the inspection. No hourly rates, and nothing added on the day.
Balcony repairs, before and after
- Before
After
AfterBeforeSandstone-look balcony tiles, heavily stained and marked - Before
After
AfterBeforeCharcoal tiled balcony with perished grout throughout
Book the inspection
Free, and there is no pressure at the end of it. If your balcony does not need the work, we will tell you that too.
5.0from 86 Google reviews
Ray quotes the job and Ray does the work.
Every one of those reviews is for the same person who will turn up at your door — not a call centre and a subcontractor you have never met.
Four steps, no surprises
Call or send the form
Tell us what you are seeing. Free, no obligation, and we answer 7 days.
On-site inspection
We trace the leak to its real source and photograph it, rather than guessing from the doorway.
Fixed written quote
Evidence-based and itemised. You get a price, not an hourly rate and a shrug.
Repair & warranty
Sealed, tested, and covered in writing — 10 years on showers, 5 on balconies.
What our customers say
5.0 from 86 Google reviews“We recently had our leaking balcony regrouted by Seal Masters and Ray was fantastic to deal with. Ray was prompt in coming out to quote, diagnosing the issue and clearly explaining to us how to remediate the leak.”
— Elaine Lui“I recently had the pleasure of working with Ray for a bathroom reseal and I cannot recommend him highly enough.”
— Jess Lee“Fantastic service, honest, evidence-based quotes supplied.”
— John Crawford
What people ask about leaking balconies
How much does a balcony repair cost in Sydney?
Most land between $1,499 and $6,000. Where yours sits comes down to the size of the balcony, the condition of the tiles and grout, and how far the water has already travelled — a balcony caught early is a much smaller job than one that has been wetting the ceiling below for two years. You get a fixed written price after the on-site inspection: no hourly rates, no surprises on the day.
Do you have to remove my tiles?
Usually not. Our resin injection system seals the substrate through the existing tiles, so the balcony stays intact and you keep the surface you have. We only recommend a full strip-and-remembrane when the structural falls are wrong or the slab itself has failed — and we show you the evidence before you commit to that.
My strata says the balcony is common property. Can you still help?
Yes, and it comes up constantly. We provide a written, photographed report identifying the leak source, which is exactly what an owners corporation or strata manager needs in order to approve the work. We quote the strata, the building manager or the owner direct — whoever is signing.
Can you do a whole block, not just one balcony?
Yes. One balcony on a townhouse or every balcony on a block gets the same crew and the same warranty. For multi-unit work we inspect and report on the lot, so the owners corporation can see which balconies need doing now and which can wait.
What does AS 4654 compliant mean?
AS 4654 is the Australian Standard for waterproofing membranes used externally above ground — balconies, terraces and podiums. It covers the membrane itself, how it is terminated at edges and penetrations, and the falls needed to drain water away. Where we install a new membrane, we install it to that standard.
How long does the work take, and what warranty do I get?
Most residential balconies are finished in a day. Larger terraces or a full membrane replacement run to two or three. Every balcony we waterproof carries a 5-year workmanship warranty, supplied in writing with your invoice — if it leaks again inside that period, we come back.
Balcony repairs across Sydney
Sydney metro
The CBD, eastern suburbs, north shore and the greater Sydney basin.
Inner West
Terraces, semis and apartment blocks — the balconies and bathrooms that leak the most.
Southern Sydney
From the St George area down through the Sutherland Shire.
Macarthur
Our home patch. Based in Campbelltown, so local jobs get seen fastest.
Based in Campbelltown and working right across the Sydney basin. Not sure if we reach you? Call 0424 626 557 and we will tell you straight away.
Get it priced properly
Send through the suburb and what you can see, and Ray will call you back to book the inspection.
$1,499 – $6,000Typical balcony repair, fixed in writing
Where a job lands in that range comes down to three things:
- The size of the balcony or shower
- The condition of the tiles and grout
- How far the water has already travelled
The inspection and the written quote are free either way.
Get a fixed price on your leaking balcony
Free on-site inspection, a written report you can take to strata, and a 5-year workmanship warranty on the repair.