Scammers pretending to be legitimate workmen are charging homeowners thousands of pounds for roofing work that is not completed, done badly or not necessary, according to Citizens Advice.
The consumer advice charity says one in 10 of all the scams it recorded over the past year were related to roofing, making it the most common type of scam brought to them.
It can leave victims like Crystal, from the Midlands, thousands of pounds out of pocket.
The 68-year-old was frightened and found it hard to sleep after a rogue builder left her roof with dislodged bricks and blocked gutters.
She said she felt pressured into agreeing to having her roof re-done and paid a total of £5,500, only for the original contractor to send his son instead, who left work in the eaves incomplete.