Defective Waterproofing in Apartments: Your Legal Options as a Melbourne Owner
Introduction
It usually begins quietly. A tide mark on the ceiling below a balcony, grout that never seems to dry, a musty smell behind the shower wall, or a neighbour downstairs asking whether you have had a leak. For many Melbourne apartment owners, these are the first signs of defective waterproofing in apartments, and by the time they appear the damage behind the tiles is often well advanced.
Water ingress is among the most common and costly defects in Victorian apartment buildings, and it rarely stays within one lot. It moves through slabs, balconies, planter boxes and podium decks, drawing in neighbouring owners, the owners corporation, insurers, the original builder and, increasingly, the developer. In this article, I explain who is legally responsible, how long you have to act, the new enforcement powers that commenced in Victoria on 1 July 2026, and the practical steps that give owners and committees the strongest footing for a claim.
Why defective waterproofing in apartments is more than a maintenance issue
A failed membrane is not simply wear and tear. Waterproofing must be designed and installed to comply with the National Construction Code and the Australian Standards it calls up, and when it is not, the result is usually a building defect for which someone other than the owner is legally answerable. Treating it as routine maintenance, and paying for patch repairs from the sinking fund, can quietly shift that cost onto owners who should never have carried it.
The commercial stakes are significant. Unresolved water ingress erodes property values, complicates sales and refinancing, raises insurance premiums and, left untreated, can progress to concrete cancer and corrosion of reinforcement. For investors, it can also mean untenantable units and lost rent. Acting early and in the right order is often the difference between a funded rectification and a special levy.
Is your building approaching ten years old? Limitation periods for building defects in Victoria are strict and are measured from the occupancy permit, not from when the leak appears. If your owners corporation is weighing its options, speak with our construction team before the window narrows.
Key legal points for Melbourne apartment owners
The statutory warranties that protect you
Section 8 of the Domestic Building Contracts Act 1995 (Vic) implies warranties into every domestic building contract. The builder warrants that the work will be carried out in a proper and workmanlike manner, with suitable materials, in accordance with the law and the building permit, and that the finished work will be reasonably fit for its purpose. Defective waterproofing will commonly breach several of these warranties at once.
Importantly, section 9 extends these warranties to later owners. You do not need to have signed the building contract, or to be the first purchaser, to rely on them. If you bought your apartment second hand, the warranties travel with the property.
Common property or your lot: who holds the claim
Where water enters through a roof, façade, podium or shared balcony structure, the defect is usually in common property, and the claim generally belongs to the owners corporation. Defects confined within a lot, such as an ensuite membrane, may instead be a matter for the individual owner. In practice, many leaks cross that boundary, so identifying the source early matters. Under the Owners Corporations Act 2006 (Vic), an owners corporation generally needs a special resolution of lot owners before commencing legal proceedings, which means committees should plan the governance steps alongside the technical investigation.
The ten-year clock
Section 134 of the Building Act 1993 (Vic) provides that a building action cannot be brought more than ten years after the date the occupancy permit (or certificate of final inspection) was issued. Victorian courts have confirmed that this is a hard outer limit, and in staged developments the relevant date can depend on which permit covers the defective work. Many Melbourne apartment towers completed during the construction boom of the mid 2010s are now approaching, or have reached, that threshold.
Rectification orders under the 2026 reforms
From 1 July 2026, the Building and Plumbing Commission can issue rectification orders requiring defective, non-compliant or incomplete building work to be fixed. These orders can be directed to the builder and to the developer, may be issued up to ten years after the occupancy permit, and apply to buildings completed before the reforms began. For owners whose builder has become insolvent or unresponsive, this is a meaningful new avenue, although the Commission decides whether to act and owners cannot compel an order.
Warranty insurance and buildings above three storeys
Victoria's new first resort Home Warranty scheme, which also commenced on 1 July 2026, applies only to buildings of three storeys or less. Owners in larger apartment buildings have never had access to statutory warranty insurance and still do not. Developer bonds and decennial liability insurance for buildings of four storeys or more are scheduled to follow from 2027 onwards, but they apply to new projects and will not assist owners of existing buildings. For most apartment owners, the claim against the builder and developer remains the principal route to recovery.
Practical guidance: what to do when water gets in
The first priority is evidence. Photograph and date every sign of water ingress, keep copies of correspondence, and report the issue in writing to your owners corporation manager so there is a clear record of when the problem was raised. Resist the temptation to let a contractor strip and retile before the defect has been properly investigated, because destructive repairs carried out too early can remove the very proof a claim depends upon.
Next, commission an independent building consultant to identify the cause, scope the rectification and assess whether the work departs from the Code, the relevant Standards and the approved plans. A well-prepared report usually shapes everything that follows, from the letter of demand to the dispute resolution process. Owners corporations should also notify their building insurer promptly, though policies frequently exclude defective workmanship, so insurance should be treated as a parallel enquiry rather than the answer.
Most domestic building disputes then move through the Building and Plumbing Commission dispute resolution service, formerly Domestic Building Dispute Resolution Victoria, before proceeding to the Victorian Civil and Administrative Tribunal if they remain unresolved. A common misstep is allowing the builder to undertake repeated superficial repairs while the limitation period runs. If you are unsure whether your building is still within time, or who should be named in a claim, that question deserves an answer before anything else.
How we can help
Our construction law practice acts for apartment owners and owners corporations across Melbourne in waterproofing and building defect matters, from first investigation through to negotiated rectification, Commission proceedings and VCAT. The legal team works closely with Daniel Whelan our Construction Industry Adviser, whose background in architecture and project management allows us to read a defect report with precision and test the rectification scope before it is presented to the other side.
Our approach is always commercially aligned. We help committees understand their position, satisfy their governance obligations, preserve their claim within time and pursue the outcome that best protects the value of the building. If your building is showing signs of water ingress, our construction dispute lawyers in Melbourne can provide a clear early assessment. To arrange a confidential discussion, please contact our team.
Frequently asked questions
Who is responsible for fixing defective waterproofing in an apartment in Victoria?
Responsibility usually rests with the builder who carried out the work, because the statutory warranties in section 8 of the Domestic Building Contracts Act 1995 (Vic) require work to be done properly, with suitable materials and in compliance with the law. From 1 July 2026, the Building and Plumbing Commission can also direct a rectification order to the developer.
How long do I have to make a claim for waterproofing defects in Victoria?
A building action generally cannot be brought more than ten years after the occupancy permit was issued, under section 134 of the Building Act 1993 (Vic). The period runs from the permit date, not from when the leak is discovered, so owners of older buildings should seek advice promptly.
Can an owners corporation sue the builder for a leaking balcony or roof?
Yes. Where the defect is in common property, the owners corporation can usually pursue the builder in its own name and rely on the statutory warranties. It will generally need a special resolution of lot owners before commencing legal proceedings under the Owners Corporations Act 2006 (Vic).
Does home warranty insurance cover waterproofing defects in high-rise apartments?
No. Victoria's Home Warranty scheme covers buildings of three storeys or less, so owners in larger apartment buildings cannot claim under it. Their primary remedies are claims against the builder and developer, and a request that the Building and Plumbing Commission consider a rectification order.
Disclaimer: This article provides general information only and is not legal advice. The law is complex and varies based on individual circumstances. You should seek specific legal advice about your particular situation before making any decisions about legal matters.
Krishita Ramjeet
Krishita Ramjeet is a Melbourne construction lawyer with over a decade of legal experience, including roles at Master Builders Victoria, Major Road Projects Victoria and Lloyd Group. She advises builders, developers and construction professionals on contracts, building disputes and commercial risk.
