Police are urging people to beware of doorstep scammers posing as Tarmac workers.
The warning follows an incident in the Tuckswood area of Norwich, where a group of men approached a property offering to lay Tarmac.
Often, when this approach is used, the cold caller will quote an initial price for the work, but once work has commenced the price will increase dramatically.
A spokesman for Norfolk Trading Standards said: "We always advise people to never deal with cold callers looking to undertake work on or around your property
"Never agree to have work done by somebody who is 'just passing' or take their word that it needs to be done at all."
It is possible these doorstep cold callers could move on to other areas around Norfolk and could approach businesses as well as residential properties.
There was a similar incident in Trowse where three men were reported to have been cold calling and offering driveway cleaning services.
Anyone who spots these cold callers or suspects rogue trader activity should contact the Citizens Advice consumer helpline on 0808 223 1133.
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