If a quote tells you that from 2027 the excavator on a Melton site cut must meet a European or American off-road emissions standard, ask for the Australian law and the start date. The federal department that looked at this has not published one.
The rule that does not exist yet
The Department of Climate Change, Energy, the Environment and Water says Australia currently has no regulations to control noxious emissions from non-road diesel engines. Non-road engines, in that evaluation, include the diesels in diggers, graders, rollers, tractors, haul trucks, generators and pumps. The evaluation did not cover rail, aviation or large marine engines.
The department's page was last updated on 2 January 2024. It says the public consultation on the draft impact analysis has closed, the analysis was updated after feedback, and the page will be updated once further information is available. There is no 2026 or 2027 commencement date on it.
The Construction and Mining Equipment Industry Group published an advisory notice in June 2025 saying members were being asked when new Australian requirements would start. CMEIG's notice said that, at the time it was published, DCCEEW had given no further official guidance beyond the possibility of more consultation, and that industry would need adequate notice if a decision were announced. That is an industry group's account of the gap. It is not itself a law. It does line up with the department's page still carrying a 2024 "we will update this" line.
What was evaluated, and not decided
Environment ministers agreed in April 2018 to evaluate a national approach, as a priority under the National Clean Air Agreement. The evaluation was finished in mid-2022. It compared three options with doing nothing: a non-regulatory industry agreement aimed at US Tier 4f, a phased regulation via US Tier 3 then Tier 4f, and going straight to Tier 4f as soon as practicable. The department says scenario 3, the straight move to the higher standard, came out as the most effective for health and cost over the long term.
The cost-benefit report's own executive material says no decision had been made to implement a national approach. "Most effective in an evaluation" is not "commences on 1 January 2027". Until the department publishes a decision and a start date, treat Tier 4 or Stage V talk as a product specification or a proposal, not as a condition of your building permit.
What the machine makers already publish
Manufacturers sell machines here that already meet overseas standards, because those machines are built for markets that have the rules. Caterpillar's Australian page for the 336 excavator says the engine meets US EPA Tier 4 Final, EU Stage V, Korea Stage V and Japan 2014 emission standards. That sentence describes that model. It does not say older machines are illegal to operate in Victoria, and it does not say Earthmoving Melbourne runs a 336.
Keep this separate from trucks. From 1 August 2026 the National Heavy Vehicle Regulator's reforms include Euro VI mass provisions for on-road heavy vehicles meeting ADR 80/04. We explain the spoil-truck side in the tipper length and mass note. A Euro VI prime mover is not an excavator.
For a homeowner, none of this changes how a site cut is set out. Levels, spoil, rock and access still decide the job. A contractor who makes emissions equipment a condition of the price should be able to point to a commenced Australian instrument. If they cannot, you are hearing a sales line.
A Stage V badge on a brochure is a maker's specification. It is not a Victorian site-cut law.
Frequently asked questions
Will Victorian site cuts have to use a Stage V excavator from 2027?
No such commencement is stated on the Department of Climate Change, Energy, the Environment and Water's non-road diesel page. That page, last updated 2 January 2024, says Australia has no regulations controlling noxious emissions from non-road diesel engines, and that the page will be updated when there is more to say.
Didn't truck emissions rules change in 2026?
On-road heavy vehicles are a different regime. The NHVR's 1 August 2026 reforms include Euro VI mass provisions for trucks that meet ADR 80/04. Those provisions do not set an emissions standard for excavators, loaders or other non-road diesel plant.
Sources
- Noxious emissions from non-road diesel engines, Department of Climate Change, Energy, the Environment and Water, last updated 2 January 2024.
- Advisory notice: non-road diesel engine emissions, Construction and Mining Equipment Industry Group, June 2025.
- Cat 336 excavator, Caterpillar Australia. The page states the emissions standards that model's engine meets.
- HVNL reform implementation, National Heavy Vehicle Regulator, including Euro VI mass provisions for on-road heavy vehicles from 1 August 2026.
Policy pages go quiet and then move. If you are relying on this for a tender condition, re-read the department's page on the day.