Chris Grabas, the manager of Skedaddle Wildlife Control, says he is getting dozens of calls a day from people complaining about hearing scratching noises in the walls at night.
He says about 70 per cent of the pests are mice.
"Mice tend to get into people’s homes as the cold weather approaches. They tend to move indoors and people hear them more now than at any other time," Grabas told Mike Finnerty on CBC's Daybreak.
Grabas says the winter months are when mice seek shelter to warm up, as they normally stay outside more in warmer months.
However it’s not just mice — it is also mating season for squirrels and raccoons wanting a secure place to have their babies.
Fit through dime-sized holes
Grabas says preventing mice from getting into homes is not a question of cleanliness. He says mice can fit through holes as small as a dime, such as little gaps in bricks, siding foundations and vents.
He says mice are mostly active mostly at night and tend to stay inside attics, as well as walls and underneath floorboards where it’s quiet.
Grabas says it is especially common to find them in insulation, where they make their nests.
"It’s perfect for their litters it gives them a sense of warmth," he said.
Skedaddle Wildlife Control says the only way to keep the mice out is to seal up the entire property with silicone.
"That’s what we specialize in — sealing up the home in its entirety and every gap a mouse can get into. It requires detailed work and finding every little gap," said Grabas,
He says the most humane way to get rid of them alive is to install tiny one-way doors so they can't get back in.
The price to seal up the house is more expensive than hiring an exterminator. However Grabas says homeowners will just have to kill more mice after exterminators leave because new ones move in.
"Exterminators are usually a quick solution, but not a long-term solution," he said.