Leaking into the unit below, drummy tiles, rust stains, cracked edges or a loose balustrade. We repair the whole balcony system: structure, waterproofing, drainage, tiles and balustrade.
A balcony is exposed to more weather than almost any other part of a building. Sun, rain and movement break down the waterproofing membrane under the tiles over time, and once water gets through it finds the slab, the steel and the ceiling of the unit below.
The usual culprits are a failed or missing membrane, poor falls to the drain, a blocked or undersized outlet, a missing waterstop at the door, or tiles laid straight over an old leaking surface. Surface sealers can buy time, but they rarely fix a balcony that is leaking through the slab.
We start by finding out why it is leaking. Then we fix it properly: strip back, repair any concrete damage, set correct falls, install a compliant membrane to AS 4654.2, re-tile and make good the balustrade. You get a dry balcony and a documented repair.
If any of these sound familiar, it is worth a free site visit. We will tell you straight what your site needs.
Stains, bubbling paint or drips in the room or unit under the balcony.
Hollow-sounding, lifting or cracked tiles usually mean water is trapped underneath.
Efflorescence is salt carried out by water moving through the balcony.
Signs of concrete cancer in the slab edge from long-term water entry.
Poor falls or blocked drains keep water sitting on the membrane.
Movement or rust at the fixings is a safety issue and often lets water into the slab.
Balcony leaking into the unit below? Send us photos of the balcony and the ceiling and we will tell you what we think is going on.
We treat the balcony as one system. Fixing the tiles without the membrane, or the membrane without the concrete, is how leaks come back.
Visual inspection, water testing and moisture readings to find where water is getting in before any work starts.
Strip back to the slab and install a new compliant membrane with correct upturns, waterstops and outlet details.
Screeds re-graded to fall to the outlet, new or upsized drains and overflow provision where needed.
Break out and repair corroded slab edges and soffits as part of the same job, not as a separate call-out.
New tiles on a correct bed with movement joints, matched as closely as possible to the rest of the building.
Repair or replace corroded balustrade fixings and frames, re-fixed to be secure and compliant.
A selection of recent balcony repairs projects across Sydney.
View all projectsEvery balcony follows the same five steps, from leak investigation to handover.
We attend site, inspect the defect and its surroundings, and identify the cause rather than just the symptom. Where needed we take photos, moisture readings and cover measurements.
We coordinate a remedial or structural engineer where required and agree a written scope of works that fixes the cause, not only the visible damage.
You receive a clear, itemised written quote with methodology, materials, access, programme and any approvals. No vague lump sums.
Our crew carries out the work to the engineer's specification and Australian Standards, with progress photos and hold-point inspections at each critical stage.
Final inspection, clean-up and a handover pack: photos, product data, engineer sign-off where applicable, and your statutory warranty under the Home Building Act 1989.
Membrane product data, photos at every stage including the membrane before tiling, flood testing where appropriate, and your statutory warranty.
Tiling over a leak or painting on a sealer is not a repair. We fix the membrane, the concrete and the drainage underneath, because that is where balconies fail.
We diagnose why the defect happened. Patching over the symptom is why so many repairs fail twice.
DBP General Unrestricted (BUP4254812). Qualified for Class 2 apartment remedial work under the Design and Building Practitioners Act 2020.
Builder Licence 384697C, $20M public liability, workers compensation and HBCF cover where required.
We work with remedial and structural engineers from diagnosis to sign-off, so the fix is designed, not guessed.
Photos, product data, hold-point records and certification. Exactly what strata committees, insurers and buyers ask for.
Hands-on remedial and heritage work across Sydney since the 1970s, including jobs other builders turned down.
Real reviews from homeowners, strata and builders.
I couldn't be more pleased that I found Constatine and his team to assist our strata building with landscaping, waterproofing, and concrete cancer repairs. He was knowledgeable, reliable, patient, and deeply committed to achieving the best result for everyone involved. I am 100% confident that the work completed will stand the test of time. He will absolutely be my go-to moving forward, and I have no doubt we will work together again.
Constatine and his team did an excellent job repairing and waterproofing our garage ceiling and walls, which had been affected by concrete cancer and sandstone erosion. Constatine is highly experienced in remedial works and provided clear advice, transparent costings, and recommended the best products available to ensure a long-lasting result. We highly recommend METCON for specialist remedial works.
We're a strata block and needed a retaining wall replaced urgently. METCON moved fast, communicated well, and the residents are very happy.
Straight answers from the builder. Anything else, just ask.
Remedial building is the repair of defects, damage and deterioration in existing buildings, such as concrete cancer, leaking balconies, failed waterproofing, rising damp and cracked facades. The aim is to fix the underlying cause and restore the building's performance, not just its appearance.
For Class 2 apartment buildings in NSW, remedial work is regulated under the Design and Building Practitioners Act 2020. METCON holds DBP General Unrestricted registration (BUP4254812), so we can carry out that work and lodge the required declarations.
It depends entirely on the defect, its extent, access and the specification. A small concrete cancer patch is very different from a whole-building balcony programme. We inspect for free and provide an itemised written quote so you can see exactly where the money goes.
Residential building work in NSW carries statutory warranties under the Home Building Act 1989: six years for major defects and two years for other defects. We provide full documentation at handover.
Remedial problems rarely come alone. Leaks cause concrete cancer, damp causes render failure. We fix the whole chain.
Back to Remedial BuildingPlain-language guides from our team on the questions we are asked most.
Apartment blocks, terraces and houses across the Eastern Suburbs, North Shore, Inner West and beyond.
Photos of the balcony surface, the drain and any staining below are enough for an initial view. We will book an inspection from there.
