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Body Corporate Plumbing Compliance — What Every Strata Manager Needs Scheduled Annually
Body Corporate Plumbing Compliance — What Every Strata Manager Needs Scheduled Annually — a Prime Plumbing & Gasfitting plain-English guide to body corporate plumbing compliance for Melbourne strata managers and body corporates. Below we cover what works, what doesn't, and when to call a licensed plumber.
Quick answer: Owners corporations in Victoria are responsible for the plumbing infrastructure in common property — incoming water mains, shared hot water plant, gas plant rooms, common-area amenities, common backflow devices. The strata manager schedules and pays for annual compliance testing on each of these. Four main jobs: backflow testing on the RPZD or DCV at the building's incoming main; gas compliance on the shared hot water plant and any common-area gas appliances; carbon monoxide testing where gas appliances are in shared spaces or near sleeping areas; and TMV testing if the building has TMVs in common-area amenities (gym change rooms, pool change rooms). All four can be done by one contractor on one annual visit, with reports lodged with Yarra Valley Water and kept on the OC's records.
What's owners-corporation responsibility vs lot owner responsibility
The split is in the property's plan of subdivision, but the general rule for plumbing:
| Owners corporation (common property) | Lot owner (inside their apartment) | |---|---| | Incoming water main + meter | Hot and cold supply lines inside the lot | | Shared backflow devices (RPZD/DCV on incoming main) | Individual flexi hoses, taps, mixers | | Shared hot water plant (central instantaneous or storage bank) | Individual hot water unit (if lot has its own) | | Common-area amenities (pool, gym change rooms, building lobbies) | Lot-internal bathrooms, kitchens, laundries | | Plant room gas isolation + gas meter assembly | Lot-internal gas appliances | | Common stormwater and waste plumbing | Lot-internal drain branches |
Plumbing compliance testing on the common-property side is OC-funded and OC-scheduled. Most Victorian OCs hold a small annual budget line for this; the strata manager books and oversees the testing each year.
When the boundary is unclear — read the plan of subdivision
For most disputes, the plan of subdivision settled at the time the building was registered is the legal authority. Common-property pipes are usually marked on the plan or described in the schedule. Where the plan is silent, default rule under the Owners Corporations Act 2006 (Vic) is: anything serving more than one lot, OR anything inside the structural fabric (walls, slabs, risers) belongs to common property. Lot-internal fixtures stay with the lot owner. For OC compliance work itself, see our apartment plumbing service.
The four annual jobs a strata manager schedules
1. Backflow testing — the building's RPZD or DCV
Most Melbourne apartment buildings built since the early 2000s have a backflow prevention device at the property's water main entry. Older buildings sometimes had one retrofitted after a Yarra Valley Water audit notice.
Annual test: required under AS 2845.3 for medium and high hazard devices. Test results lodged directly with Yarra Valley Water (or South East Water / City West Water depending on supply area).
What can go wrong: check valves fail to seat, pressure-relief valves stick open, internal corrosion from older buildings. A failed device may need rebuild ($350-$650 for service kit + labour) or replacement ($1,800-$4,500 for an RPZD swap on a typical apartment building main).
2. Gas compliance — the shared hot water plant + common gas
If the building has a central hot water system (instantaneous bank, storage system, or hybrid), it needs annual gas compliance review and a Compliance Certificate trail for any work.
What's checked: gas line tightness from the meter to each appliance, isolation valves operate, flue draft on flued units, no signs of carbon-deposition on burners (which signals incomplete combustion).
The hidden gotcha: many apartment buildings have the gas meter assembly in an external enclosure that's been quietly modified over years (extra branches added when units were upgraded, isolation valves replaced piecemeal). The annual visit is when we find these. A clean asset register entry after each year prevents nasty discoveries during a future sale or major service.
3. Carbon monoxide testing — flued and unflued appliances
CO testing is required wherever gas appliances serve common or sleeping areas. In apartment buildings the most common areas:
- Plant room with shared hot water units — flued, but if the flue draft is wrong, CO can leak back into the building
- Common-area kitchens (rare, but in clubrooms/function rooms)
- Gas-fed pool heating (less common in Melbourne but still encountered)
A CO test takes ~5 minutes per appliance with a calibrated analyser. The number on the report should be near zero in normal operation; anything above background warrants investigation.
4. TMV testing — only if the building has them in common areas
Many apartment buildings don't have TMVs in common property — TMVs sit inside each lot at the resident's basin/shower.
You need annual TMV testing on common property if:
- The building has a pool or gym with public-style change rooms (TMVs usually fitted to the showers)
- The lobby has a kitchenette or basin used by all residents
- Building has shared accessible bathrooms (some retirement and over-55s buildings)
If your building has no common-area TMVs, this test doesn't apply — skip it.
What a typical annual compliance visit looks like
For a 20-40 unit Melbourne apartment building:
Site visit duration: 2-3 hours On the day:
- Walk through plant room with strata manager / building manager
- Test the building's backflow device (gauge attached, pressure tests, valve operation)
- Walk the gas line from meter to each appliance, isolation test each
- CO reading on each gas appliance
- (If applicable) TMV tests in common-area amenities
Off-site, next business day:
- Backflow certificate lodged with the water authority
- Gas compliance summary issued
- CO test results documented
- Asset register update emailed to the strata manager
- Calendar reminder for next year's visit booked
What the strata manager receives at the end of the visit
You get one PDF document pack per building, per year: backflow test report + Yarra Valley Water lodgement receipt, gas compliance summary + BPC Compliance Certificate if work has been performed, CO test readings per appliance, TMV per-outlet sheets if applicable, and an updated asset register. Stored against the building, not the individual PM — survives PM turnover. Same workflow as our apartment plumbing contract.
Quoting for body corporate compliance
Most Melbourne body corporates settle into a per-building annual contract in the $400-$1,200 range, depending on:
- Building size — small 8-unit walk-up vs 100-unit tower
- Plant complexity — single hot water bank vs zoned multi-plant system
- Backflow device count — single RPZD on the main vs multiple branch devices
- Common-area TMVs — none vs gym + pool change rooms (adds 4-8 valve tests)
We provide a written quote after a 30-minute site walk-through (free, no commitment).
Where the $400-$1,200 range actually lands per building
The two biggest variables are device count and plant complexity. A 12-unit walk-up with a single building backflow device + 1 hot water unit + 1 common-property gas appliance is at the lower end. A 60-unit tower with multiple backflow devices, central hot water plant, gym + pool TMVs, and a basement carpark oil-water separator is the upper end. We quote against actual device count after a 30-min walk-through — no estimates from a desk. Multi-building portfolios get a discount; see our apartment plumbing service.
Common strata manager mistakes
From OC contracts we've taken over from other contractors:
- No annual compliance budget line — the work gets booked reactively when YVW sends a notice, which is more expensive than a contracted annual schedule.
- Multiple separate contractors — one for backflow, one for gas, one for CO. Each charges a separate call-out fee plus admin overhead. Combining saves 20-30%.
- Owner of the gas meter isn't clear — sometimes the energy retailer owns the meter to a certain point, beyond which it's OC infrastructure. Worth confirming at the first visit.
- Old documentation lost in committee handovers — every committee changeover, some paperwork goes missing. We can rebuild the asset register from a fresh walk-through.
- Lot-owner repairs get billed to the OC by mistake — if a lot owner's flexi hose burst and damaged common property, the lot's insurance covers it, not the OC. Worth checking before approving an invoice.
How to handle a contractor change-over cleanly
Ask the outgoing contractor for the asset register, the most recent test reports, and any open non-conformance items. If they will not hand them over, the water authority (Yarra Valley Water for most of Melbourne) keeps the backflow lodgement records and will confirm device count + last-test dates. The new contractor can rebuild the asset register from a single walk-through. Read our commercial plumbing compliance page for the wider workflow.
Set up your building's 2026 annual compliance
What a 30-minute site walk-through actually achieves
The free site walk-through covers: counting the backflow devices and noting type/size; identifying the gas meter and the common-property gas appliances; locating the oil-water separator (carpark buildings); checking for TMVs in common areas (gym, pool, lobby toilets); noting access constraints (PIN-code plant rooms, locked roof access, BM-only zones). After the walk we send a fixed-price annual quote within 5 business days. Same approach as our apartment plumbing service.
Call 0475 407 670 or send the building address and OC plan number through the form below. We'll arrange a 30-minute site walk-through (free) and quote a fixed-price annual contract.
When to Call a Licensed Plumber
Some plumbing problems are DIY-friendly; others need a licensed professional under Victorian law.
Anything involving gas, sewer drainage, hot water units, backflow prevention, or work behind tiled walls must be handled by a licensed plumber or gasfitter.
FAQs
Yes. Compliance requirements apply to the device, not the build year. An older device may need replacement at the next test, but the testing itself is required.
The OC budgets it from the general administrative fund. Individual lot owners don't get separate compliance invoices for common-property testing.
Site walk-through within a week of contact for most Melbourne metro buildings. Annual contract confirmed within a fortnight after the walk-through.
Yes. Same-week response for compliance deficiencies. If a device needs replacement, common RPZD sizes are typically available within 2-3 business days.
The Compliance Certificate and test reports are the evidence the OC committee needs to demonstrate maintenance compliance at AGM. Reports are formatted with the building address, OC plan number, and date so they slot directly into AGM documentation.
Before You Book
A quick checklist to share with your plumber when you book:
- When did the issue start?
- Is it isolated to one fixture or multiple areas?
- Are there any visible leaks, smells or unusual sounds?
- Have you turned off the relevant isolation valve?
If you're unsure, Prime Plumbing & Gasfitting can inspect the issue and explain the options before any work starts. Call 0475 407 670 or request a quote online.
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