Victoria runs its own plumbing regulatory regime — and if you document commercial hydraulic or wet-services work in the state, you can’t rely on the NCC and AS3500 alone. The Plumbing Regulations 2018, administered by the Victorian Building Authority (VBA) under the Building Act 1993, set out who can do what, which jobs need compliance certificates, and exactly what evidence the drafter’s documentation must support. This guide is a practical deep-dive for MEP and hydraulic drafters preparing submissions for Melbourne and regional Victorian projects.
For our full NCC-level overview, see our MEP compliance guide to NCC and Australian Standards. The post below layers the Victorian-specific obligations on top.
The Victorian legislative stack at a glance
Three instruments work together to govern plumbing work in Victoria:
- Building Act 1993 (Vic) — the head Act that establishes the VBA and empowers the plumbing regime.
- Plumbing Regulations 2018 — prescribes classes of plumbing work, licensing categories, compliance certificate requirements, and the inspection regime.
- Plumbing Code of Australia / NCC Volume Three — the technical performance code, which calls up the AS3500 suite as Deemed-to-Satisfy provisions.
The regulations don’t replace AS3500 — they sit above it, defining the administrative and licensing envelope within which AS3500 is then used as the technical reference. A drawing that satisfies AS3500 can still fail a Victorian audit if the paperwork path is wrong.
What counts as “plumbing work” under Victorian law?
Regulation 6 of the Plumbing Regulations 2018 defines prescribed classes of plumbing work. For commercial MEP projects, the classes most often in scope are:
- Water supply plumbing — cold, warm and heated water services.
- Sanitary plumbing — above-ground fixtures, stacks, vents.
- Sanitary drainage — below-ground foul drainage to the point of connection.
- Stormwater drainage — roof, surface and sub-surface water disposal.
- Mechanical services plumbing — hydronic heating, chilled water, cooling-tower condenser water, and refrigerant piping above a certain size.
- Gas-fitting — natural gas and LPG installations.
- Fire protection plumbing — wet and dry fire services, hydrants, hose reels, sprinklers.
Each class requires a licensed or registered practitioner and each class typically triggers its own Certificate of Compliance. The drafter’s job is to ensure the documentation cleanly supports the certifying practitioner’s scope without ambiguity.
How AS3500 slots under the Victorian regulations
AS3500 is the technical backbone the VBA measures compliance against. It’s split into five parts, and a Victorian commercial project will usually touch all of them.
Water supply (AS3500.1)
Covers pipe sizing, backflow prevention, insulation, and cold/warm water delivery temperatures. In Victoria, backflow containment testing and annual registration is enforced at the water authority level (City West Water / Yarra Valley / South East Water / Greater Western Water) — your drawings should clearly show the boundary RPZD or DCV and its testable configuration.
Sanitary plumbing and drainage (AS3500.2)
Fixture unit loading, stack sizing, venting strategy, trap seal retention. Melbourne’s older inner-city stock often forces AAV use instead of a full vent stack — this must be called out on the drawings and is a common audit query.
Stormwater (AS3500.3)
Roof drainage, overflows, and legal point of discharge. Councils across Melbourne vary in their LPD requirements, so the drafter usually coordinates with the civil engineer on a site-specific basis.
Hot water (AS3500.4)
Delivery temperatures, TMVs, deadleg lengths, and ring-main design. Healthcare, aged care and childcare projects in Victoria are subject to tighter temperature control (typically 45°C at the fixture) and your documentation must show the TMV locations and commissioning points.
Certificates of Compliance and the VBA portal
Once plumbing work is done, the licensed practitioner lodges a Certificate of Compliance through the VBA’s online portal. The certificate references the plumbing work classes performed, the property, the licensee, and — importantly — the drawings and specifications the work was performed against.
This matters for drafters because:
- Drawing sheet numbers and revision status must be stable and citable at the point of lodgement.
- The as-installed set should reflect any on-site variations so the certificate accurately describes what was built.
- A percentage of certificates are randomly audited by the VBA, and the documentation pack is what auditors ask for first.
Documentation a Victorian hydraulic drafter must prepare
For a typical Melbourne commercial project, the hydraulic drafting pack needs to include:
- Site services plan showing legal point of connection and meter location.
- Below-ground drainage plan with invert levels, gradients, inspection openings.
- Above-ground sanitary plumbing and vent diagram (isometric or schematic).
- Cold, warm, hot and heated water reticulation plans with pipe sizing table.
- Backflow prevention schedule with device type, size and hazard rating.
- Stormwater plan with catchment areas, rainfall intensity and LPD.
- Fire services reticulation (hydrants, hose reels, sprinklers) coordinated with the fire engineer.
- Gas reticulation with meter, regulators and load calculations.
- Fixture schedule tied back to the architectural room data.
- Commissioning and testing notes referencing the relevant AS3500 clauses.
Our team delivers these as coordinated Revit models and 2D sheets — see our hydraulic drafting services page for the full deliverable list.
Common audit findings on Melbourne commercial sites
Based on VBA bulletins and our own project experience, the most frequent documentation-related issues we see on Victorian commercial jobs are:
- Missing or incorrect backflow device hazard rating on the drawings.
- Tempered warm water outlets not clearly marked in healthcare and childcare facilities.
- AAV locations shown without indicating the required access panels.
- Fire hydrant and sprinkler zones not reconciled against the fire engineering report.
- Revision status of the construction-issue drawings not matching the certified set.
- Stormwater LPD details inconsistent with the civil engineer’s discharge plan.
Many of these are documentation-hygiene problems rather than design faults — which is why robust drafting discipline matters more than most Victorian builders realise.
Coordination with Melbourne-specific project conditions
Melbourne’s commercial context throws in a few extra considerations. Inner-city heritage overlays often restrict where services can penetrate facades. Tight basements in Southbank and Docklands push pump rooms and tundish arrangements into compact service cupboards. Industrial corridors in the west frequently need trade waste pre-treatment that must be negotiated with the relevant water authority before drawings are finalised.
For projects across the metro and regional VIC, our MEP BIM drafting in Melbourne team works directly with the licensed plumbing contractor to align the drawings with the Certificate of Compliance pathway from day one, avoiding last-minute rework at handover.
How Meter Built delivers VIC-compliant hydraulic documentation
Our approach for Victorian hydraulic and wet-services projects is:
- Start every project with a compliance matrix mapping each plumbing class to AS3500 parts and the nominated licensed practitioner.
- Maintain revision discipline so the construction-issue set can be cited on the VBA Certificate of Compliance without ambiguity.
- Coordinate with mechanical services and fire engineering in a federated BIM model to eliminate conflict between overlapping service classes.
- Issue a clearly marked as-installed set so the licensed plumber’s certificate truly reflects the built work.
- Maintain a library of Victorian-specific notes and details (trade waste, backflow, TMV, fire booster assemblies) so every project starts from a compliant baseline.
Whether you’re delivering a medical fit-out in East Melbourne, a logistics facility in Truganina, or a mixed-use development in Footscray, we can supply the hydraulic BIM and drawing package to the exact standard the VBA and your certifying practitioner expect. For a scoped quote on a Victorian project, explore our Melbourne service area or request a fee proposal directly from the hydraulic team.