If you live in a strata building, your water supply lines, drainage pipes, and sewer connections all serve multiple units at once, running through common walls, floors, and ceilings. Usually, everything runs smoothly.
But when something goes wrong, like a leak, a blockage, or water damage appearing somewhere unexpected – one of the first questions is always: who’s responsible for fixing it? And more importantly, who pays?
If you’re a property manager or on an Strata committee in Melbourne, you’ve probably been here. Strata plumbing responsibility is genuinely one of the trickier parts of the job. But once you know the basic rules to strata vs lot owner plumbing, most situations are a lot easier to sort out than they first appear.
Quick Takeaways
- The core rule is simple: pipes that serve the whole building are the responsibility of owners corporation plumbing, while pipes that only serve one unit are the lot owners responsibility.
- Victoria’s Owners Corporations Act 2006 makes maintenance of shared plumbing a legal obligation for the Strata.
- Your plan of subdivision is the document that settles most disputes. Always check it before anyone starts arguing about costs.
- When the source of a leak isn’t obvious, the OC usually arranges the investigation. That doesn’t automatically mean they foot the whole bill.
- A plumber who knows strata buildings will save you a lot of headaches. They understand how to document findings clearly so costs can be allocated fairly.
Strata Plumbing Responsibility; Shared Pipes vs. Your Pipes
The simplest way to think about strata plumbing responsibility is who does the pipe serve?
- If a pipe runs through the building and supplies or drains water for multiple units, the plumbing is the owners corporation’s job to maintain.
- If a pipe only ever serves your unit, even if it happens to run through a shared wall, that’s on the lot owner.
Victorian law backs this up. Under the Owners Corporations Act 2006, the OC is legally required to repair and maintain common property and shared services. It’s not discretionary. Section 46 of the Act spells it out clearly.
What falls under owners corporation plumbing
Shared plumbing infrastructure falls under owners corporation plumbing responsibility. That generally covers:
- The main water supply lines running through the building
- Shared sewer and drainage pipes
- Stormwater systems
- Plumbing connected to common areas like car parks, laundries, or rooftop plant rooms
What’s on the lot owner
If the plumbing exclusively serves one unit, it’s the lot owner’s responsibility, even if a plumber has to access shared walls to fix it. In practice, that includes:
- Taps, showers, and bathroom fixtures inside the unit
- The toilet and its pipework
- Flexi hoses under sinks and basins (worth checking these regularly as they’re a common cause of unit flooding)
- A hot water system that only serves that apartment
- Any blockage that started inside the unit
Strata VS Lot Owner Plumbing: Examples
Water stains on ceilings
A damp patch on a ceiling doesn’t automatically mean the unit above is responsible. Water travels, and it can track along pipes or through slabs before it shows up somewhere else entirely.
The OC will usually organise someone to investigate, but that doesn’t mean the OC pays for everything once the cause is found. The bill follows whoever owns the plumbing that caused the problem.
Blocked drains
If the blockage is in a shared drain stack serving multiple units, that’s an owners corporation issue. But if the blockage was caused by something flushed from one particular unit, the OC can often recover costs from that lot owner.
Many buildings have a by-law in place for exactly this, sometimes called a chargeback arrangement.
The plan of subdivision is your starting point
Here’s the thing that catches a lot of people out: plumbing boundaries aren’t the same in every building. What’s common property in one strata scheme might be the lot owner’s responsibility in another. The only way to know for sure is to check your plan of subdivision.
Before anyone agrees to pay for anything, pull out the plan. Your OC manager should have a copy. If not, it’s registered with Land Use Victoria.
Strata vs Lot Owner Plumbing at a Glance
| Situation | Who’s Responsible |
| Blocked toilet inside a unit | Lot owner (unless caused by a shared pipe fault) |
| Blocked main drain stack | Owners corporation |
| Burst flexi hose under sink | Lot owner |
| Leak from a common area pipe | Owners corporation |
| Dripping tap inside the apartment | Lot owner |
| Water hammer in shared pipes | Owners corporation |
| Hot water system (single unit only) | Lot owner |
| Centralised hot water system | Owners corporation |
What to Do When a Plumbing Issue Comes Up
- Stop the damage first. If it’s safe to do so, isolate the water supply.
- Take photos straight away. Document the damage, the location, and the date.
- Work out the likely source. Shared infrastructure or inside a unit.
- Check the plan of subdivision before allocating costs.
- Call a plumber who knows strata. Clear reporting from the plumber makes cost allocation much easier later.
- Keep all parties in the loop. Assumptions left to fester are often how disputes start.
If you need support with an active issue or want to set up a plumbing maintenance and repairs programme for your building, get in touch with Vic Plumbing.
We’re easy to reach and happy to help.
Keeping Up with Maintenance
The owners corporation plumbing obligation to maintain shared utilities is a legal requirement. Letting common infrastructure deteriorate puts the committee at risk of complaints, disputes, or action at VCAT from affected lot owners.
Regular maintenance is almost always cheaper than emergency repairs. And a documented maintenance programme gives your committee evidence that you’re taking your obligations seriously, which matters if a dispute ever does escalate.
If your building doesn’t have a current plan in place for shared plumbing upkeep, it’s worth getting one sorted.
How Vic Plumbing Can Help
At Vic Plumbing and Drainage, our drainage and strata plumbing team works with property managers and OC committees across Melbourne to keep buildings running smoothly, and help committees stay on top of their owners corporation plumbing maintenance responsibilities.
Get in touch for a quote. We’re happy to walk through your building’s situation and recommend a sensible approach.
