The owners corporation pays for leaks caused by common property, such as roofs, external walls, and waterproofing membranes, while lot owners pay for leaks starting inside their own fixtures, taps, or appliances. Exceptions apply if a by-law shifts responsibility or a renovation caused the fault. Your immediate job is simple: find the source, then notify your strata manager in writing today.
TL;DR:
- Responsibility is determined by the leak’s source, with the owners corporation covering common property issues and owners liable for internal fixtures and appliances.
- Proper documentation, including photographic evidence and professional diagnostic reports, is crucial for resolving disputes and obtaining reimbursement.
- Strata law in NSW mandates owners corporations to repair all common property defects, even if they were caused by prior building issues or only affect one lot.
- Emergency repairs should be actioned immediately by shutting off water, calling an emergency plumber, and notifying the strata manager the same day to strengthen reimbursement claims.
- Each state has its own laws and procedures; always verify the specific regulations and how responsibilities are outlined in your scheme’s documents before acting.
Table of Contents
- What determines strata water leak responsibility?
- How do you identify the source of a water leak?
- Who covers the cost: building insurance or the owners corporation?
- What should you do the moment you find a leak?
- How do you escalate a strata leak dispute?
- Where can you check your state’s specific rules?
- What a proper plumbing diagnostic actually involves
- A plumber’s view on strata leaks
- Get a fast diagnosis and a report that holds up
- Sources
- FAQ
What determines strata water leak responsibility?
Responsibility follows the source of the leak, not where the water ends up. A ceiling stain in your lounge room might come from a cracked roof membrane two floors up, a neighbour’s dishwasher hose, or your own bathroom waterproofing. Until someone identifies where the water actually started, nobody can say who is on the hook for repairs.
This “source first” principle sits at the heart of every strata dispute over water damage, and it is also the reason so many disputes drag on. Damage is visible immediately; the cause often is not.
Common property versus lot property
Strata schemes divide a building into two broad zones, and the split matters more than most owners realise until a leak forces the question.
Common property typically includes:
- Roofs, guttering, and external walls
- Waterproofing membranes under tiled floors and in wet areas
- Shared plumbing risers, stacks, and pipes that service more than one lot
- Balconies, if the by-laws or strata plan classify them as common property (check yours; this varies)
Lot property typically includes:
- Taps, mixers, and internal fittings inside your unit
- Appliances and their connecting hoses (washing machines, dishwashers)
- Toilet cisterns and internal pipework that serves only your lot
- Fixtures you have installed yourself, including unauthorised renovations
The NSW Government’s guidance on strata repairs and maintenance confirms lot owners are generally responsible for fixtures, fittings, and appliances located entirely within their own boundaries, while the owners corporation carries the load for everything classified as common property.
The documents that actually decide your case
Generic advice only gets you so far. The documents that determine your specific situation are the ones registered against your scheme, and every strata owner should know where to find them:
- The registered strata plan, which sets the physical boundaries of each lot
- The scheme’s by-laws, which can modify default responsibility (some schemes shift balcony or window maintenance to lot owners, for example)
- Any common property memoranda or special resolutions the owners corporation has passed
- Meeting minutes recording past decisions about specific defects or shared services
Cross-check these before assuming the standard rule applies. A by-law passed years ago might already answer your question.
The statutory duty owners corporations can’t dodge
In New South Wales, section 106 of the Strata Schemes Management Act requires owners corporations to properly maintain and keep common property in good repair. Courts have treated this as a strict duty in most cases, meaning an owners corporation generally can’t refuse to fix a common property defect just because it’s expensive, was caused by the original builder, or only affects one lot. It has to repair the fault, then chase recovery from a builder or negligent party separately if grounds exist.
That single point trips up a lot of committees. “The building was defective when we bought it” or “only unit 12 is affected” are not lawful excuses to leave a leak unrepaired once the source sits in common property.
How do you identify the source of a water leak?
Start with what you can safely do yourself, then bring in a professional the moment the cause isn’t obvious.
- Isolate the obvious suspects. Turn off the water supply to any appliance near the damage (washing machine, dishwasher, hot water unit) and check hoses and fittings for visible cracking or corrosion.
- Check for patterns. Note whether the leak appears only after rain (suggests roof or external wall ingress), only when a specific appliance runs (suggests internal fixture), or constantly (suggests a pressurised pipe).
- Photograph everything. Wet patches, ceiling staining, peeling paint, and any visible pipework, with a timestamp.
- Call a licensed plumber if the source isn’t immediately obvious, which is most of the time with strata leaks.
- Escalate to a building consultant or hydraulic engineer if the plumber’s findings point to a structural issue like a failed waterproofing membrane or a defect in the building envelope.
Licensed plumbers diagnose leaks using pressure testing (isolating sections of pipe to find where pressure drops), moisture mapping (tracking dampness through walls and floors), thermal imaging, and CCTV camera inspections run through pipework. Each method rules things in or out; a competent plumber usually combines two or three to be sure.
Pro Tip: Ask for the diagnostic report before the invoice, not after. A report dated the same day as the works, with photos and a clear statement of probable cause, is worth far more in a reimbursement claim than a verbal explanation months later.
Water ingress is the single most common cause of strata disputes in NSW, and identifying the source with a proper report is almost always the first step lawyers and tribunals expect to see. Temporary containment, buckets, towels, turning off an isolating valve, is fine to stop damage spreading, but don’t mistake it for a permanent fix. If water is actively entering a lot and causing damage, emergency repairs can and should proceed before a full diagnostic report is finished; you sort out who pays afterwards.
Who covers the cost: building insurance or the owners corporation?
Strata (building) insurance covers the physical structure and common property; a lot owner’s contents or landlord insurance covers what’s inside the lot. These two policies rarely overlap cleanly, and that gap is where most confusion starts.
Strata insurance typically pays for repairing the actual damage to common property elements, roofing, membranes, shared pipework, but insurers often draw a hard line between “damage” (covered) and “wear and tear” or “poor maintenance” (not covered). If an insurer knocks back a claim on the wear-and-tear ground, that refusal doesn’t remove the owners corporation’s statutory duty to repair. The corporation still has to fix the defect; it just has to fund the repair itself if the insurer won’t.
A lot owner’s contents or landlord policy typically covers damage to their own possessions, floor coverings, and sometimes internal fit out, but not the structural fix itself if the source sits in common property.
Roughly two in three NSW strata disputes referenced in POBI Lawyers’ analysis of strata water leaks trace back to water ingress, making it the leading cause of friction between owners and owners corporations.
For emergency repairs you pay for yourself, follow this sequence to protect your reimbursement claim:
- Get the invoice itemised, showing labour, parts, and a description of works
- Keep the plumber’s diagnostic report showing probable cause
- Notify the strata manager in writing the same day, describing what happened and what you paid
- Lodge a formal reimbursement request per your scheme’s rules, some require committee approval above a set dollar threshold before funds are released
The NSW Government’s repairs and maintenance guidance notes owners corporations generally need to obtain at least two quotes for larger works and can raise a special levy to fund urgent repairs when the sinking fund won’t cover it. If a leak was caused by an owner’s negligence, say, an unreported dripping tap left running for weeks, the owners corporation can pursue recovery from that owner, including through NCAT if the amount is disputed.
What should you do the moment you find a leak?
Move fast, but move in order. The sequence below limits damage and protects your evidence at the same time.
- Cut the water. Turn off the local isolating valve for the affected fixture, or the mains if you can’t locate it. If water is near powerpoints or switches, turn off power to that area first.
- Call an emergency plumber. Don’t wait for a scheduled inspection if water is actively flowing.
- Notify your strata manager and committee immediately, in writing. Include the time you noticed the leak and what you’ve done so far.
- Tell your landlord too, if you’re a tenant. Landlords must keep rental properties in a reasonable state of repair, and they need to know before they can act.
- Photograph and film the damage, with timestamps, before you clean up or move anything.
- Keep every invoice and diagnostic note from the moment repairs begin.
None of this needs to feel like a legal exercise. It’s the same habit as keeping receipts after a car accident, boring at the time, essential three weeks later when someone asks for proof.
How do you escalate a strata leak dispute?
Most disputes never need a tribunal. They get resolved because one party had better records than the other, and the strata manager or committee simply agreed with the stronger case.
NCAT and equivalent state tribunals typically expect a specific evidence bundle: dated photos of the damage, a plumber or engineer’s report stating probable cause, invoices for any work already completed, a copy of your written notice to the strata manager, and relevant extracts from meeting minutes or by-laws touching the affected area. Clear, dated diagnostic reports materially improve reimbursement outcomes and reduce how often disputes need to go to tribunal at all.
On timing: notify the strata manager the day you find the leak, not the week after. Follow your scheme’s own reimbursement process, most set a threshold above which committee sign off is needed before funds are released. If the leak sits in a grey area (say, a balcony membrane your by-laws don’t clearly assign), check the registered plan and by-law extracts before assuming either party is at fault.
If the strata manager or committee won’t act, the practical escalation path runs: written request to the committee, formal notice referencing section 106 or your state’s equivalent, mediation through your state’s fair trading body, and only then an NCAT application if mediation fails.
- Keep every letter and email short and dated; a one-paragraph notice with a photo attached is more persuasive than a long letter with no evidence.
- Track every date: when you noticed the leak, when you notified the manager, when repairs happened.
- A professional diagnostic report carries more weight at NCAT than any amount of correspondence between neighbours.
Pro Tip: If you’re heading toward NCAT, ask your plumber to write the report in plain language stating whether the source is common property or lot property. Tribunal members read dozens of these; a clear one-line conclusion up front gets noticed.
Where can you check your state’s specific rules?
Every state runs its own strata or body corporate legislation, and the fine print differs enough that you should never assume NSW rules apply if you own in Brisbane or Melbourne.
- NSW: Section 106 of the Strata Schemes Management Act sets the owners corporation’s repair duty. Check the NSW Government’s strata repairs and maintenance page for current guidance and 2025 reform updates.
- QLD: Body corporate maintenance obligations sit under different legislation again. The Queensland Government’s body corporate maintenance responsibilities page sets out who fixes what.
- VIC: Owners corporations operate under Victoria’s own Owners Corporations Act, with separate dispute pathways through Consumer Affairs Victoria and VCAT.
None of these override your own registered strata plan or by-laws. Always cross-check the general guidance against your scheme’s actual documents before acting on anything you read online, including this article.
What a proper plumbing diagnostic actually involves
A strata leak report worth relying on states the probable origin plainly, not “possible causes include…” A useful report includes the tests performed (pressure testing, moisture mapping, CCTV inspection), dated photographs of the affected area and any pipework, and a concise professional opinion on whether the fault sits in common property or inside the lot.
Ask your plumber directly: what tests did you run, what’s your conclusion on the source, and can I get that in writing today? A CCTV drain inspection that finds a cracked stack under a shared bathroom floor is a different conversation with your strata manager than a guess based on a wet patch.
Coordinate early: send the plumber’s findings to your strata manager the same day you receive them, and ask the manager to confirm in writing which category (common property or lot) they believe applies based on that report.
A plumber’s view on strata leaks
Most strata leaks I’ve seen traced back to two things: a failed flexible braided hose behind a dishwasher, or a waterproofing membrane that quietly gave out years after it was installed. Neither announces itself loudly. Water just starts turning up somewhere it shouldn’t.
The owners who fare best are the ones who call a plumber early, document everything, and loop in the strata manager before arguments start. The ones who fare worst wait, hope it dries out, and argue about fault with no report in hand.
— Peter Honey
Get a fast diagnosis and a report that holds up
Priority Plus Plumbing is the practical alternative to waiting days for a scheduled inspection while water keeps spreading through common property or your lot. We run a 24/7 emergency response across Sutherland Shire and Sydney, with CCTV inspections, pressure testing, and moisture mapping that produce the kind of dated, photographed diagnostic report strata managers and insurers actually want to see.
Every job comes with upfront pricing before we start, so there are no surprises when the invoice lands in front of your owners corporation for reimbursement. Our workmanship guarantee backs the repair itself, whether that’s a burst pipe, a failed hot water system, or a hidden leak behind a wall. For schemes wanting to get ahead of the next dispute, we also run ongoing maintenance contracts that catch failing fixtures before they become a claim.
If water is moving through your property right now, call our emergency team and we’ll get someone out to diagnose the source and start the paperwork your reimbursement claim will need.
This article is general information, not a substitute for advice from a qualified lawyer. Consult a qualified legal professional about your own circumstances before acting on anything here.
Sources
- Strata repairs and maintenance — NSW Government
- Common Property Water Leaks: A Strict Duty to Repair — JS Mueller & Co
- Water leaks in NSW strata buildings — POBI Lawyers
FAQ
Are water leaks covered by strata insurance?
Strata insurance generally covers damage to common property, roofs, membranes, shared pipework, but insurers often exclude damage caused by wear and tear or poor maintenance. Contents inside your lot are usually covered by your own contents or landlord policy, not the strata policy.
Who is responsible for a water leak in an apartment?
Responsibility follows the source: the owners corporation pays for leaks originating in common property like roofs or shared pipes, while the lot owner pays for leaks starting inside their own taps, appliances, or fixtures. Always check your specific by-laws, as some schemes shift default responsibility.
Is the owners corporation responsible for water damage?
Yes, if the water damage originates from a common property defect. Owners corporations carry a strict statutory duty to repair common property under laws like section 106 of the NSW Strata Schemes Management Act, and can’t refuse repairs just because a defect predates them or only affects one lot.
Is strata responsible for waterproofing?
In most schemes, waterproofing membranes are classified as common property, making the owners corporation responsible for their repair and maintenance. Check your registered strata plan and by-laws, though, as some schemes classify balcony or wet area waterproofing differently.
What should I do first when I notice a leak in my strata unit?
Turn off the relevant water valve, photograph the damage, call a licensed plumber for diagnosis, and notify your strata manager in writing the same day. A dated diagnostic report from that plumber becomes your key evidence if you need reimbursement later.