A group representing real-estate agents is urging the government to standardise the testing homes for meth contamination.
The Real Estate Institute has set up a working group to look at whether vendors should provide a meth test with every house sale.
Director Bryan Thomson said clear guidelines were needed for agents dealing with potential contamination.
"The big trouble that we've got with meth right at the moment is there are no national legislative standards set for either testing of the homes, indeed the tests that are conducted and the results that are given back.
"It's about having a framework that allows you, if you choose to test, that you can rely on the result."
Mr Thomson said meth contamination was becoming a major concern for property buyers.