PHOTO: Methamphetamine contamination became one of the most controversial issues in New Zealand property. FILE
New methamphetamine disclosure guidance has landed for New Zealand real estate agents — and it could put agents in an uncomfortable position when a vendor wants silence. Above 15µg/100cm², REA considers contamination a defect that must be disclosed. But even below that level, one question from a buyer can change everything.
For years, three words have been capable of sending a chill through a New Zealand property transaction:
“It tested positive.”
Methamphetamine contamination became one of the most controversial issues in New Zealand property.
Homes were tested.
Properties were stigmatised.
Landlords spent thousands on remediation.
Buyers walked away.
And an entire testing industry emerged around the fear of purchasing a former “meth house.”
Then came the backlash.
Were we overreacting?
Were tiny traces of methamphetamine residue really making houses dangerous?
Were perfectly habitable properties being unnecessarily decontaminated?
Now the Real Estate Authority has rewritten its guidance for the people standing directly between vendors and purchasers:
REAL ESTATE AGENTS.
And every real estate agent selling residential property in New Zealand should understand what’s changed.
The new guidance was issued on 7 September 2026, replacing REA’s previous 2018 guidance. It follows the new Residential Tenancies methamphetamine regulations that took effect on 16 April.
But here’s where things get interesting.
THE MAGIC NUMBER IS NOW 15
REA’s position is straightforward.
If any part of a property has methamphetamine residue above 15 micrograms per 100cm², REA considers that a property defect.
And if the agent knows about it:
IT MUST BE DISCLOSED TO POTENTIAL BUYERS.
That’s not merely something an agent should perhaps mention if they think it’s relevant.
REA links that obligation directly to Rule 10.7 of the Code of Conduct, which requires licensees to disclose known defects.
The new tenancy regulations use the same key contamination threshold: areas above 15µg/100cm² are considered contaminated and require decontamination.
And there’s another number worth knowing.
30µg/100cm².
Under the tenancy regulations, rental properties containing areas above that level are considered uninhabitable.
So we now have much clearer lines in the sand.
But that’s not actually the most fascinating part of the new guidance.
WHAT IF THE TEST IS BELOW 15?
Here’s where agents need to pay attention.
REA says disclosure generally isn’t required where a property tests at 15µg/100cm² or below, or has been successfully decontaminated back to that level or lower.
Sounds simple.
Except there’s a very important exception.
If a prospective purchaser specifically asks about meth contamination — or has clearly demonstrated an interest in it —
THE AGENT MUST DISCLOSE IT AT ANY LEVEL.
That’s potentially a massive distinction.
Imagine the conversation at an open home:
BUYER: “Has this property ever tested positive for meth?”
The agent knows an old test returned a reading below the 15µg threshold.
Can the agent simply say:
“It’s below the disclosure threshold.”
Not according to REA’s guidance.
If the purchaser specifically asks about meth contamination, disclosure is required at any contamination level.
That makes one seemingly casual question at an open home potentially very important.
AND AGENTS CAN’T SIMPLY IGNORE THE WARNING SIGNS
This may be the biggest part of the story for the real estate industry.
Agents aren’t expected to become forensic scientists.
They’re not required to rip walls apart looking for hidden contamination.
But REA says licensees are expected to know the property they’re selling and identify issues that would appear likely to a reasonably competent licensee.
The new guidance actually gives agents a list of possible red flags.
These include unusual smells, fumes or vapour, sealed or covered windows, chemical staining, chemical containers or stained equipment, information from neighbours or other agents, unusual use of the premises and — in some circumstances — a tenant refusing access for inspections over an extended period.
Read that again.
Information from neighbours can potentially matter.
REA even addresses rumours.
If an agent hears less-reliable information in the community, the guidance says they should consider whether it can be verified or whether testing is required to remove doubt.
Suddenly:
“Someone down the road reckons P was being smoked there…”
isn’t necessarily something an agent should simply laugh off.
THE LIM MAY NOT SAVE YOU EITHER
Some agents and buyers might assume:
“If there’s a meth problem, surely it’ll be on the LIM.”
Not necessarily.
REA says a LIM may contain information about methamphetamine contamination if the council has been notified — often by Police.
But if council hasn’t been notified?
It won’t hold that information.
That’s an important message for purchasers too.
A clean-looking LIM doesn’t automatically mean nobody has ever used or manufactured methamphetamine at the property.
THEN COMES THE NIGHTMARE SCENARIO FOR THE AGENT
Imagine this.
You’re the listing agent.
Something doesn’t look right.
Perhaps you’ve received credible information about previous meth use.
You raise it with the vendor.
The vendor says:
“Absolutely not. We’re not testing it.”
And then:
“And you’re NOT telling buyers.”
Now what?
This is where an agent’s duty to the vendor collides head-on with their professional obligations.
Under Rule 10.7, where a reasonably competent licensee thinks a hidden defect may exist, the agent must either obtain evidence or expert advice supporting the position that there isn’t a defect, or inform the customer of the significant potential risk so they can obtain expert advice themselves.
And Rule 10.8 goes even further.
A licensee must not continue to act for a client who instructs them to withhold information of the type covered by Rule 10.7.
In plain English:
THE LISTING ISN’T WORTH YOUR LICENCE.
“BUT MY VENDOR TOLD ME NOT TO SAY ANYTHING” ISN’T A MAGIC SHIELD
This is something the industry needs to understand.
Real estate agents work for vendors.
But they are also licensed professionals operating under statutory conduct rules.
REA’s broader disclosure guidance tells agents that if they believe a problem needs disclosure and the vendor refuses, they may need to walk away from the transaction.
That creates a very uncomfortable conversation.
Imagine winning a $1 million listing.
Photography done.
Advertising booked.
Campaign underway.
Potential commission worth tens of thousands of dollars.
Then the meth issue appears.
The vendor wants silence.
What does the agent choose?
The commission?
or
The Code of Conduct?
There should only be one answer.
TESTING HAS CHANGED TOO
Remember the old days when someone could swab multiple areas, combine everything together and suddenly announce:
“THE HOUSE HAS METH!”
REA specifically warns against unreliable testing methods.
The updated guidance says field composite tests and unvalidated testing kits aren’t acceptable under the tenancy regulations and aren’t recommended, because they can produce false positives or false negatives and don’t necessarily identify which particular locations are contaminated.
Where detailed testing is required, REA says it should be conducted in accordance with the tenancy regulations by a suitably qualified professional under NZS 8510:2017.
That’s important.
Because New Zealand has already lived through one era where fear arguably ran ahead of the science.
REMEMBER THE GREAT NZ METH-HOUSE PANIC?
In 2018, the report from then Prime Minister’s Chief Science Advisor Sir Peter Gluckman fundamentally changed the conversation.
The report found no evidence of adverse health effects from third-hand exposure to methamphetamine smoking residues on household surfaces at levels below 15µg/100cm².
It also concluded there was little reason to test a property unless there was good reason to suspect methamphetamine manufacture or very heavy use.
That was hugely significant.
Suddenly, New Zealand had to confront an uncomfortable possibility:
Had we spent years being terrified of houses that weren’t actually dangerous?
The new 2026 regime effectively embeds the 15µg figure much more clearly into the regulatory landscape.
THERE’S AN IMPORTANT CHANGE FOR FORMER METH LABS TOO
This detail could easily get missed.
Under REA’s previous guidance, there was a distinction between properties where meth had merely been used and those where it had been manufactured.
The old guidance required a former manufacturing property to be remediated below 1.5µg/100cm² before disclosure was no longer required.
The new REA guidance moves to a single 15µg/100cm² threshold for disclosure, regardless of whether the residue arose from use or manufacture.
That’s a substantial simplification.
But here’s the twist.
Even after remediation to 15 or below, if a buyer specifically asks about meth contamination, the agent still needs to disclose.
SO WHAT EXACTLY DOES AN AGENT NEED TO DO?
For agents, the practical message from the new guidance can be boiled down to this:
- Above 15µg/100cm² and known to you? Disclose it.
- 15 or below? Generally no disclosure required.
- Buyer specifically asks about meth? Disclose known contamination at any level.
- There are credible red flags? Don’t ignore them — raise them with the vendor and consider investigation/testing or disclosure of the risk.
- Vendor wants you to hide a defect that must be disclosed? You cannot simply follow the instruction and carry on.
- Testing is required? Use appropriate testing methods consistent with the new regime.
But there’s a critical qualification.
REA itself stresses that its document is guidance, not legislation and not legal advice. Whether conduct amounts to unsatisfactory conduct is ultimately for a Complaints Assessment Committee, and potentially the Tribunal on appeal, to determine.
That’s important because every property has its own facts.
WHAT ABOUT VENDORS?
Vendors should probably pay attention too.
Because trying to keep your agent deliberately ignorant may not be the clever strategy it appears.
If an agent becomes aware of credible evidence of contamination, the issue doesn’t disappear because the vendor doesn’t want to discuss it.
And if the agent concludes information must be disclosed but the vendor refuses?
The vendor could lose the agent.
Potentially right in the middle of the sale.
There’s a much better approach:
Find out exactly what you’re dealing with.
Test appropriately.
Get expert advice.
Remediate if required.
Document everything.
Then sell the property with clarity rather than hoping an issue doesn’t surface halfway through due diligence.
AND BUYERS? ASK THE QUESTION.
This may be the single most useful takeaway for purchasers.
If methamphetamine contamination concerns you:
ASK.
Don’t assume the agent will volunteer every historical trace below the threshold.
The guidance specifically distinguishes between general disclosure requirements and what happens when a purchaser clearly demonstrates an interest or specifically asks about methamphetamine contamination.
So ask directly:
“Are you aware of any current or previous methamphetamine contamination or testing at this property?”
That’s a considerably better question than:
“Is this a meth house?”
Make it clear what information you’re seeking.
And ideally, get the answer in writing.
PROPERTY NOISE TAKE: THIS IS ACTUALLY GOOD NEWS FOR AGENTS
At first glance, another 12-page regulatory guidance document probably isn’t going to have agents popping champagne.
But clarity is better than ambiguity.
Methamphetamine contamination became such an explosive property issue partly because nobody seemed certain where sensible caution ended and hysteria began.
The 2026 approach gives the industry a much clearer benchmark.
15µg/100cm².
But the number doesn’t replace professional judgement.
And that’s where agents still carry risk.
Because the difficult cases won’t be the house with a laboratory report showing 25µg.
That’s easy.
The difficult case will be the one where:
a neighbour says something,
the vendor denies it,
there’s no council record,
the buyer asks questions,
the campaign is already underway,
and a substantial commission is sitting on the table.
That’s where professionalism gets tested.
And perhaps that’s exactly why REA has issued this guidance.
Because an agent’s job isn’t merely to sell the house.
It’s to facilitate a transaction without misleading either side.
And when it comes to methamphetamine contamination, New Zealand’s regulator has just made one thing considerably clearer:
IF YOU KNOW — OR THERE’S A SIGNIFICANT RISK YOU SHOULD REASONABLY RECOGNISE — YOU CAN’T SIMPLY LOOK THE OTHER WAY.
REA Chief Executive Belinda Moffat says the objective is ultimately consumer protection: buyers need relevant information to make informed decisions, while agents need enough clarity to exercise good professional judgement.
For an industry built on disclosure, that’s probably exactly where the line should be.
🔥 HAVE YOUR SAY
Has New Zealand finally found a sensible middle ground on meth-contaminated houses — or is 15µg/100cm² the wrong line to draw?
And for agents:
Would you walk away from a valuable listing if a vendor ordered you not to disclose a meth risk you believed buyers needed to know about?
That’s where this gets interesting.