People have been warned about doorstep cold callers claiming they can see issues with roofs.
The alert was issued after an incident in the Wymondham area, where a man approached a local claiming their roof needed repairs.
He offered to carry out the work immediately for £2,000 and was seen driving a silver Ford Transit van.
A warning advised caution when dealing with unsolicited offers of home repairs or maintenance.
A spokesman for Norfolk County Council said: "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."
The advice also warned people not to let cold callers into their homes, gardens or onto their roofs, regardless of whether they offer to do small tasks for free or at a low cost.
"Only deal with reputable companies you have researched and chosen yourself and have obtained a written quotation from before commencing the work," the spokesman added.
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