NSW Fair Trading has issued a warning after a rise in reports of scams and conmen.
More than 100 reports have been lodged with NSW Fair Trading this year and commissioner Rod Stowe said people should be aware of the potential dangers.
"Travelling conmen are unqualified and unethical charlatans. Even one person stung by these itinerant traders is one too many," Mr Stowe said.
"Most of the reports we get to our hotline are about bitumen or roof work, although we have also received reports of tree trimming, line marking and pest spraying.
"Scam traders have sophisticated schemes set up where they can look and seem like the genuine deal.
"They often target vulnerable people who can least afford it and they can become aggressive when asking for payment."
He said other scams that had been active this year included those based on tax revenues, speeding fines and fund raising.
"Be aware of any requests for personal information or money," he said.
The National Travelling Conmen Hotline can be reached on 1300133408. Advice on what to look out for is at www.fairtrading.nsw.gov.au.
Online scams and fraud should be reported to the Australian Cybercrime Online Reporting Network at www.acorn.gov.au.