How to Get Rid of Mice and Rats: Exclusion First, Traps Second, Poison (Almost) Never

Norway rats burrow and stay low (basements, crawl spaces, ground floors); roof rats climb (attics, trees, roof lines — common in the South and on the coasts). Where you hear the noise tells you which one, and where to seal.

The honest answer to "how do I get rid of mice permanently" is: with a caulk gun and hardware cloth, not with any trap or repellent. Walk the entire foundation and roofline with a flashlight and check, in order of frequency:

• Gaps where utilities enter — gas, AC lines, cable, dryer vent, outdoor faucets
• Garage door corners and side seals — the #1 mouse entrance in most homes
• Foundation gaps and weep holes (screen weep holes, don't fill them)
• Door thresholds without sweeps, especially to garages and basements
• Attic and crawl-space vents with torn screening; gaps where rooflines meet
• Around plumbing under sinks — the wall holes behind the escutcheon plates

Seal with materials rodents can't chew: coarse steel wool or copper mesh backed with sealant for small gaps, 1/4" hardware cloth for vents and larger openings, and metal flashing or mortar for structural gaps. Foam alone is a snack, not a barrier — use it only as a binder over mesh.

Timing matters: rodent entry peaks September through November as temperatures drop, with indoor activity running through winter (see the seasonal calendar). Sealing in late summer is the highest-leverage pest work you'll do all year.

Most DIY trapping fails from too few traps, not the wrong bait. Rodents are caught in the first few nights or not at all, so open strong:

1. Use enough traps. For mice: 6–12 snap traps for a typical problem, 2–3 per active area. You want the population hit hard on night one, before survivors get trap-shy.
2. Placement beats bait. Rodents hug walls. Set traps perpendicular to the wall, trigger end against the baseboard, in dark runways: behind the stove, under sinks, along garage walls, near droppings.
3. Bait small and sticky. A pea-sized smear of peanut butter out-catches a big glob (they can lick a glob off). Chocolate spread and nesting material (cotton ball) also work.
4. For rats, pre-bait. Set baited but unset traps for 3–5 days until bait disappears reliably, then set them all at once. Skipping this step is why "smart" rats seem untrappable.
5. Check daily, rebait every few days. Move any trap that's caught nothing in 3–4 nights.
6. Choose snap traps over glue. Snap traps kill instantly and reset cheaply; glue boards are slower, crueler, and no more effective. Electronic traps work fine if you prefer no-touch disposal.

Wear gloves for disposal, and don't sweep or vacuum droppings dry — mist them with disinfectant first, then wipe (dried rodent waste can carry pathogens; this is standard CDC-consistent hygiene guidance).

How you know you've won

Stop guessing; measure. Once catches taper to zero, dust a light flour patch on cardboard in the old runways and check for tracks after two nights. Clean up existing droppings (disinfect first) so any new ones stand out immediately, and leave two baited traps down as sentinels for a month. No tracks, no fresh droppings, and quiet walls for 7–10 straight days means cleared — then finish any sealing you deferred, because the vacancy you just created is an open invitation to the next mouse scouting your foundation.

Rodenticide feels like the "serious" option. Indoors, it usually backfires four ways:

• They die in your walls. Poisoned rodents retreat to their nests — inside wall voids and attics — and the odor of a decomposing rat can make a room unusable for weeks, with no way to remove the source short of cutting drywall.
• Secondary poisoning. Pets and raptors that catch a poisoned, slow-moving rodent ingest the poison too. This is a leading reason wildlife rehab centers and vets see anticoagulant cases.
• It fixes nothing. Poison doesn't close the hole. New rodents move into the vacancy, and now you're feeding the neighborhood.
• Kids and pets. Even in stations, loose bait indoors is a standing risk — which is why the EPA restricts how consumer rodenticides can be sold and requires tamper-resistant stations.

The legitimate use of rodenticide is exterior, locked bait stations maintained on a schedule — which is essentially a professional service product. If your situation genuinely calls for bait, it calls for a pro.

Bring in a professional when: it's rats and pre-baited trapping hasn't cleared them in 2–3 weeks; droppings keep appearing after you've sealed and trapped; you hear activity in walls or ceilings you can't access; or there's a persistent dead-animal or ammonia smell. Professional rodent control runs $119–$744, averaging about $379, as of July 2026 — and the reason it costs more than a box of traps is that most of that money buys the full-perimeter exclusion work that actually ends the problem. A good rodent pro should walk the exterior and show you the entry points; one who only wants to scatter bait stations indoors is selling you the treadmill. Use our cost guide to benchmark the quote.