They're offering to carry out work on driveways, then starting the job before the residents have agreed to have any work carried out.
Halton Borough Council has issued a warning after being made aware of rogue traders operating in the area in the past few days.
They are offering to carry out work on consumers' driveways, in particular sealing concrete driveways.
The traders are reported to have tried to start the job before the consumers have agreed to have any work carried out.
Halton Borough Council's Executive Board Member for Trading Standards, Cllr Dave Cargill, said: "Our advice is never to deal with cold callers.
"if you do need work carrying out, try to get written quotes from at least three different contractors before you decide on one. "
If you think you have been caught out by a rogue trader, please contact the Citizens Advice Consumer Helpline who will forward your details to Trading Standards.
If you or somebody you know has been caught out by a scam or fraud please contact one of our specialist officers, Linda or Sue on 0151 511 8785 or 0151 511 8775, who are already working with people in Halton who have lost thousands of pounds to scams.
If you need advice on anything else please contact the Citizens Advice Consumer Helpline or 0808 223 1133