Who Pays for Balcony Leaks in Strata NSW? — Owner's Rights Explained

Understanding who pays for balcony leaks in NSW strata begins with the Strata Schemes Management Act 2015 — the primary legislation governing apartment buildings in New South Wales. This Act defines what constitutes common property versus lot property, and assigns maintenance responsibilities accordingly.

Under Section 106 of the Act, the owners corporation has a strict obligation to maintain and repair common property. Common property includes the structural elements of the building — load-bearing walls, slabs, roofs, and the waterproofing membranes that protect them. Because balcony epoxy grout sealing membranes are integral to the structural slab and prevent water damage to common areas and other lots, they are almost universally classified as common property.

Section 108 clarifies lot owner responsibilities. Each lot owner must maintain their lot in good condition and must not use their lot in a way that causes damage to common property or other lots. This creates the grey area for balcony leaks: if the leak is caused by a failure in the waterproofing membrane (common property), the owners corporation repairs it. If the leak is caused by the lot owner's actions — installing tiles over the membrane without approval, drilling into the slab for fixtures, or failing to maintain surface drains — the lot owner may bear some or all costs.

The Strata Schemes Development Act 2015 adds another layer. For buildings registered after July 1974, the initial owner (usually the developer) must provide a building defects inspection report at two years and a final inspection at five years. Major waterproofing defects identified during these inspections become the developer's responsibility under statutory warranty provisions. This is particularly relevant for Sydney apartment buildings constructed during the 2015–2020 boom, where waterproofing defects have been widespread.

Theory is useful, but Sydney strata residents need practical guidance. Here are the most common balcony leak scenarios we encounter, and how costs are typically allocated.

Scenario one: the waterproofing membrane has failed due to age. The balcony is fifteen years old, the tiles are in good condition, but water is leaking into the unit below during rain. In this case, the owners corporation almost always pays for membrane replacement. The membrane is common property, and its failure is a maintenance issue, not caused by any lot owner action. The lot owner may be asked to contribute to tile re-laying if the tiles are lot property and must be disturbed to access the membrane.

Scenario two: the lot owner installed new tiles without owners corporation approval, piercing the membrane with fixings. Here, the lot owner is clearly liable. They must pay for membrane repair and any resulting damage to common property or other lots. The owners corporation may also issue a notice to comply under Section 119 of the Act and seek orders at NCAT if the lot owner refuses.

Scenario three: a blocked balcony drain causes overflow and water ingress. If the drain is common property — serving multiple balconies or connecting to the building's stormwater system — the owners corporation clears it. If the drain is within the lot's balcony and blocked by the lot owner's debris (leaves, potting mix, objects), the lot owner pays. We recommend photographing the blockage source before clearing to establish liability.

Scenario four: water leaks from a planter box or feature installed by the lot owner. The lot owner pays. Any modification to the balcony that alters drainage, adds weight, or penetrates the surface creates lot owner liability for resulting leaks. This includes planter boxes, water features, built-in seating, and outdoor kitchens.

Scenario five: a new building within the defects liability period. For buildings less than six years old, the developer may be liable for major waterproofing defects under the statutory warranty scheme. The owners corporation should commission a defects report and pursue the developer or their insurer before funding repairs from the capital works fund.

Whether you are a lot owner with a leaking balcony or a strata manager overseeing a building with multiple leaks, proactive action saves money and prevents disputes. Here is the step-by-step process Sydney Sealed recommends for strata buildings.

First, commission a building-wide balcony inspection. Do not wait for individual complaints. A proactive inspection by a licensed waterproofer identifies emerging problems before they cause damage to multiple units. We use moisture meters, thermal imaging, and flood testing to assess every balcony. The report categorises balconies by condition: no action required, surface maintenance only, membrane repair required, or full remediation needed.

Second, prioritise repairs by risk. Balconies showing active leaks into units below take priority. Balconies with membrane failure but no visible damage yet should be scheduled for repair within six months. Balconies requiring only surface maintenance can be addressed through the building's routine maintenance program.

Third, obtain three quotes for the repair work. For large strata schemes, Sydney waterproofers often offer bulk pricing. But the lowest quote is not always the best — evaluate warranty terms, previous strata experience, and whether the quote includes hidden costs like scaffolding, waste removal, and tile matching. Sydney Sealed provides itemised quotes with no hidden extras.

Fourth, plan funding. If the capital works fund is insufficient, the strata scheme may need a special levy. Spread this over two to three years if the repair scope is large. Alternatively, some strata schemes use strata finance — specialised loans for building repairs that are repaid through increased levies.

Fifth, communicate transparently with all lot owners. Explain the scope, timeline, cost allocation, and disruption. Lot owners who understand why their balcony is being repaired and how costs are determined are far less likely to dispute the process. We provide plain-English scope summaries for strata communications upon request.