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‘If a pen can fit in the gap, a rat probably can too’ — pest expert urges homeowners to take these preventative steps now

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Millie Fender

16 September 2025

It’s important to act early

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(Image credit: Shutterstock)

1. Seal entry points

2. Reduce outdoor attractions

3. Use deterrents

4. Don’t let your cleanliness slip

5. Check water sources

After a record-hot summer, experts are warning that rodent numbers are on the rise as we hit the fall and winter months.

According to home insurance experts at Quotezone, a combination of warm weather and food waste can create the ideal conditions for rodents to breed. “Early intervention can prevent costly repairs and ensure the home remains safe and insurable,” says Greg Wilson, home insurance expert and CEO at Quotezone.
“Incidents that arise due to wear and tear will not likely be covered and leave owners vulnerable, making it crucial to do property checks now, before the darker evenings arrive.”

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‘If a pen can fit in the gap, a rat probably can too’ — pest expert urges homeowners to take these preventative steps now

I asked pest experts what I need to buy to prevent mice in my home — here’s what they recommend

How to rat-proof your yard — 5 expert tips to keep rodents away

It’s certainly true that prevention is always preferable to having to rid your home of a rat infestation. Not only is it disgusting to find rodents in your home, but they also pose major health risks and can cause significant damage to your home if left to run rampant.

Here are five steps recommended by experts to prepare your home for a surge in rodent numbers this fall and winter.
1. Seal entry points

(Image credit: Shutterstock)
Rats can enter your home through the tightest of gaps. And once they’re in, they’ll start to make themselves at home fast.
“Use steel wool, wire mesh, or caulk to close any gaps, cracks, and holes in walls, foundations, and around doors and windows,” says Wilson.

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You should also check gaps around entry steps and airbricks, which are some of the most common entry points for vermin.

Tomcat Rodent Block Expanding Foam Barrier: was $12 now $9 at Amazon
This expanding foam barrier expands to fill gaps and cracks, which can be exploited by rats and mice to gain access to your home. It’s pesticide-free and can be trimmed back to leave a neat finish.

2. Reduce outdoor attractions

(Image credit: Shutterstock)
Even if they don’t make their way inside, rats can be a real nuisance in your yard. They can pose threats to pets and other welcome animals that visit your garden.
“They pose significant health risks to humans and pets too,” says Wilson, “due to the various illnesses they carry which can be passed on through their droppings, urine, or even a bite.”

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‘If a pen can fit in the gap, a rat probably can too’ — pest expert urges homeowners to take these preventative steps now

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How to rat-proof your yard — 5 expert tips to keep rodents away

To keep rats out of your yard, the first thing you should consider is the trash which could inadvertently attract them.
“Avoid leaving rotting food in compost, clear garden debris where rats can nest, and trim back any trees or shrubs so branches don’t touch the house,” says Quotezone.
3. Use deterrents

(Image credit: Shutterstock)
While traps can often be a necessary last resort, you can use a host of natural remedies to repel rodents from your yard.
This can include essential oils, which can repel rats using certain odors.
“Natural deterrents like peppermint oil, ammonia, or ultrasonic devices all work well to help keep rats away,” says Wilson.
4. Don’t let your cleanliness slip

(Image credit: Shutterstock)
It can be a nuisance to stay on top of your dirty dishes, or taking out the trash, but higher levels of rodents will require you to step up your cleanliness around the house.
“Kitchens, pantries and food storage should be kept clean and free of any crumbs or spills,” says Quotezone, “and food should be kept in airtight containers.”

2 Pack 79oz Glass Jar with Lid: was $32 now $27 at Amazon
Ideal for storing pantry essentials, this two-pack of glass storage containers features a rubber seal to keep things airtight, and measurements along the side for easy dispensing.

5. Check water sources

(Image credit: Shutterstock)
Rats need water, just like us. And if your drains or gutters start to develop any other sources of nourishment for rats, you could be creating the perfect environment for them to thrive.
“Ensure gutters and drains are clean,” says Quotezone, “and fix any leaking taps or pipes. Rats are attracted to standing water.”
Standing water can also attract other pests such as mosquitoes, so if there are any areas of your yard which are susceptible to stagnant water, you should address the cause immediately.
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Millie Fender

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Managing Editor, Homes

Millie is the Managing Editor of Homes at Tom’s Guide. She’s been reviewing home tech for over five years, testing everything from coffee makers to the latest vacuum cleaners.
With particular expertise in cookware and kitchen appliances, you’ll struggle to find an air fryer Millie hasn’t tested. She’s traveled the world reporting on the latest home innovations and product launches, learning how to use pizza ovens from Pizzaiolos in Naples, and touring the De’Longhi factory in Venice. Millie is also an SCA-Certified barista.
When she’s not reporting on home and appliance trends, Millie loves watching live music. She’s currently learning the guitar – naturally, she plays a Fender.

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‘If a pen can fit in the gap, a rat probably can too’ — pest expert urges homeowners to take these preventative steps now

I asked pest experts what I need to buy to prevent mice in my home — here’s what they recommend

How to rat-proof your yard — 5 expert tips to keep rodents away

Reclaim your summer: 5 expert tips to outsmart pesky rats in your yard

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