Rodent-Proofing Your Home: Keep Mice and Rats Out for Good

TL;DR: A mouse fits through a hole the size of a dime. Rodent-proofing is about sealing entry points and removing what draws them in.

_Last reviewed: July 2026 · 2 min read_

Mice and rats only need a tiny gap and a food source to move in — a mouse fits through a hole the size of a dime, a rat a quarter. Rodent-proofing is about denying both. Four steps: seal the entry points, lock up the food, cut off the access routes, and inspect the quiet spots.

How do rodents get into a house?

Through gaps around pipes, utility lines, vents, and the foundation — wherever something penetrates the wall. Seal those gaps with steel wool packed into the hole plus caulk or hardware cloth (rodents chew through foam and plastic, but not steel/metal mesh). Sealing entry points is the single most effective rodent-proofing step.

Does food storage stop rodents?

Largely, yes. Store pantry food — and pet food — in sealed, hard containers (glass or thick plastic; rodents chew cardboard and bags). Clean up crumbs, don't leave food out, and use a sealed trash can. Remove the easy meal and your home becomes far less attractive to move into.

How does landscaping affect rodents?

Branches and shrubs touching the house are highways onto and into your home — rats climb, and overgrown vegetation gives cover. Trim back branches and bushes touching the house, keep firewood and debris piles away from the walls, and clear ground cover near the foundation. Less cover and fewer bridges mean fewer rodents at the wall.

Where should I check for rodent activity?

The quiet, undisturbed spots: the attic, basement, garage, and behind appliances. Look for droppings, gnaw marks, greasy rub marks along walls, shredded nesting material, and scratching sounds at night. Catching activity early — before a pair becomes a colony — makes control far easier. Inspect seasonally, especially as it cools and they seek shelter.

Track sealing and sightings

Logging where you've sealed and any signs of activity helps you stay ahead. Okoniq Property Hub keeps it with your home maintenance records in one private place.

Frequently asked questions

What's the best way to seal rodent entry points?

Steel wool or copper mesh stuffed into gaps (they can't chew metal), backed with caulk, and hardware cloth over larger openings and vents. Avoid foam or plastic alone — rodents gnaw right through.

Should I use traps or poison?

Snap traps are effective and let you confirm and remove the catch; poison risks rodents dying in walls (odor) and harming pets/wildlife. For an active infestation, traps plus thorough sealing — or a pro — work best.

Okoniq Property Hub helps homeowners and landlords keep maintenance, bills, and contractor info in one calm place. Get started free.

FAQ

How much does professional rodent-proofing cost?

Professional rodent exclusion typically runs $300 to $600 for a single-family home, depending on the number of entry points and repairs needed. DIY sealing costs under $100 in materials if you can access all the gaps yourself.

What time of year do rodents try to get inside?

Rodents seek indoor shelter most aggressively in fall and early winter as temperatures drop, typically September through November. They also move indoors during very hot or very dry summers when outdoor food and water become scarce.

Can rodents chew through concrete or brick?

Rats can gnaw through weakened or cracked concrete and mortar over time, though they prefer easier paths like gaps and soft materials. Mice cannot chew through solid concrete or brick but will exploit existing cracks and holes as small as a dime.

Do ultrasonic rodent repellents actually work?

Ultrasonic devices show little consistent effectiveness in independent studies — rodents habituate to the sound quickly, and walls and furniture block the signal. Physical exclusion and removing food sources remain far more reliable.