Short answer
A pre-purchase meth test samples the walls, ceilings and fittings of a property you are buying and reports the result against the Australian residential guideline of 0.5 µg/100cm². Book it inside your contract’s inspection window so a positive result can still shape your decision.
Who this test is for
- Home buyers and investors during the building and pest window
- Buyers’ agents and conveyancers wanting an independent report on file
- Anyone buying an ex-rental, a deceased estate or a mortgagee sale
Why a building and pest report won’t tell you
Methamphetamine residue is invisible. It does not show at an open home, it is outside the scope of a standard building and pest inspection, and a fresh coat of paint can sit over it. Where a property has been used for smoking or manufacture, residue settles on walls, ceilings, ducts and soft furnishings, and the cost of dealing with it falls on whoever owns the property next.
A test before settlement converts an unknown into a number. A low result lets you proceed knowing the question was asked. A high result gives you something concrete to take to your conveyancer.
Screen first or go straight to the laboratory?
For most purchases a field screen across the whole property is the sensible first step: it is quick, it takes in every room, and it shows whether there is anything to investigate. Where a screen detects residue, or where you need a figure that will hold up in a negotiation, laboratory wipe samples are taken using the NIOSH 9111 method and analysed for a measured result in µg/100cm².
Rooms that get sampled
Living areas, bedrooms, kitchen and bathroom exhaust points, return-air vents and any room used by children. The 2011 national guidelines say any room used by a child under 16 should be sampled at least once.
What Queensland’s seller disclosure rules do and don’t cover
Since 1 August 2025, sellers of most Queensland freehold property must give buyers a Form 2 seller disclosure statement before the contract is signed. A buyer can terminate if the statement is missing, and in limited cases where it is materially inaccurate. The statement is a set list of prescribed matters; a buyer should not assume it answers the meth question. Ask your conveyancer whether a testing condition suits your contract.
General information only, not legal advice.
Questions
When should I book a pre-purchase meth test?
Inside your contract’s inspection or due-diligence period, ideally alongside the building and pest inspection, so the result arrives while you can still act on it.
Does the seller have to agree?
Access is arranged through the selling agent. Testing is non-destructive: wipe samples are taken from small template areas and nothing is removed from the property.
What if the result is over 0.5 µg/100cm²?
Take the report to your conveyancer. Options usually include negotiating, asking the seller to address it before settlement, or ending the contract where a condition allows.
Sources
- Clandestine Drug Laboratory Remediation Guidelines (2011) — Australian Government — Attorney-General’s Department / Australian Crime Commission
- Australian Voluntary Code of Practice: Assessment, remediation and validation — former clandestine drug laboratories and other methamphetamine contaminated properties (2019) — Environmental Health Australia
- Queensland’s new seller disclosure rules: what you need to know before 1 August 2025 — HopgoodGanim Lawyers
Facts on this page checked against these sources on 29 October 2026.