Disgusting rodents are flooding into people's homes, munching on excess rubbish being created by people spending so much more time in their homes.
Pest control company JG Pest Control reported its busiest ever spring this year and expect it to be the same story this winter.
The dirty critters are fattening themselves up ready to get under homeowners' feet this festive season.
Sam Devereux, of JG Pest Control, said: "The initial lockdown saw a huge increase in callouts for rats and I'm sure the figures will be similar for the second one. It was our busiest ever spring.
"So many people are working from home, they are just creating much more rubbish which is basically an open invitation for rats to come inside - especially as the winter temperatures plummet.
"It is allowing rats to fatten themselves up, they are feasting on people's misery and this is a trend we expect to continue right up to Christmas.
"Christmas is going to be hard enough this year and this is another roadblock some people are going to have to deal with."
Mr Devereux advised homeowners to secure the perimeter of their properties in a bid to keep rats.
He said they normally enter via damage to the exterior of buildings such as poorly finished workmanship and damage to bricks.
The expert also thinks rats are being encouraged by some councils decreasing the frequency they collect bins.
Pest control companies also think the spike in sightings in residential properties has been aided by lockdown shutting pubs and restaurants, decreasing the number of potential food sources for famished rodents.
He said: "They are adapting to their environment and are getting good at going unnoticed. This is despite the huge rise in sightings.
"We are in our homes more than ever.
"You could say rats are coming off the High Street because shops and restaurants are closed.
"These businesses aren't throwing away huge amounts of rubbish like they normally do so you could say this is another big incentive to go searching for food in people's homes.
"As soon as the pubs, restaurants and takeaways close the rodents turn their attention to people’s homes."
Mr Devereux advised people to tidy away food are preparing meals and make sure bins are not overflowing.
He also warned to look out for signs of rodents such as droppings, an unpleasant smell and internal damage caused by gnawing.