Homeowners have been warned about fraudsters by Norfolk Trading Standards after another person suspected she was targeted.
Reports have been sent to the fraud watchdog about a potentially illegal company making its way around Norwich.
It has since warned others to "never agree to have work done by someone who has turned up at your door uninvited".
A woman who also lives in the Costessey area believes she was approached by the same crooked workers who took a couple in their 80s for £850 two weeks ago.
The 45-year-old had her first encounter with them was on March 24, saying: "I was working from home when I got a knock at the door.
"These people gave the usual spiel of 'we were doing some work next door and noticed your roof tiles needed re-cementing' or something similar.
"When I said I had no money they replied saying it would only cost £200 however this increased to £1,000 after looking at the chimney.
"I said I'd get more quotes, so got their details and I'd call back."
The woman, who did not want to be named, read about Kerry Girdlestone's parents being conned and suspected it was the same people and reported them to Trading Standards.
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A Norfolk County Council Trading Standards spokeswoman said: "Doorstep rogue traders pretend to be builders, gardeners or handymen offering to carry out work or 'urgent' repairs to your house or garden.
"The work is often poor, unnecessary and the price quoted can increase rapidly.
"Our advice is to never agree to have work done by someone who has turned up at your door uninvited."
The woman added: "It makes me angry that these people are targeting elderly people. My friend's also been scammed previously and because there's no paper trail you can't do anything.
"They seemed like genuine tradesmen at first so I can understand why people have fallen for their antics.
"I hope something is done soon."
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