How to Get Rid of Mice: Complete Rodent Control Guide

The house mouse (Mus musculus) is the most common rodent invader. Adults are small, 2.5-3.75 inches long (body only), with a tail that is roughly equal to body length. They have rounded ears, pointed snouts, and light brown to gray fur with lighter undersides. Their droppings are small (1/4 inch), rod-shaped with pointed ends.

Deer mice (Peromyscus maniculatus) are slightly larger with distinct bicolored fur (brown on top, white underneath) and large eyes. They are common in rural areas and a significant concern because they can carry hantavirus. White-footed mice are similar in appearance to deer mice and also prevalent in rural and suburban settings.

Mice are often confused with young rats, but mice have proportionally larger ears and eyes relative to their body size, thinner tails, and smaller heads. A mouse can fit through a gap as small as 1/4 inch (the diameter of a pencil), making them remarkably difficult to exclude from buildings without thorough sealing.

Droppings are the most common first sign of mice. A single mouse produces 50-75 droppings per day, so evidence accumulates quickly. Look in cabinets, drawers, under sinks, along walls, and near food sources. Fresh droppings are dark and moist; old droppings are dried and gray.

Listen for scratching, squeaking, or scurrying sounds in walls, ceilings, and attics, especially at night when mice are most active. Gnaw marks on food packaging, wood, drywall, and even electrical wiring indicate mouse activity. Mice also shred paper, fabric, and insulation to build nests, so look for shredded material in hidden areas.

Rub marks (greasy smudges along walls and baseboards) appear where mice repeatedly travel the same path. Their oily fur leaves dark streaks. You may also notice a musty, ammonia-like odor from mouse urine, especially in enclosed areas. Pets often become agitated or fixated on specific walls or cabinets when mice are present.

Mice pose serious health risks. They contaminate food and surfaces with their droppings, urine, and saliva, which can transmit diseases including Salmonella, leptospirosis, and lymphocytic choriomeningitis virus (LCMV). Deer mice specifically are carriers of hantavirus, which can cause a rare but potentially fatal respiratory illness.

Mice are a significant fire hazard. They gnaw on electrical wiring, stripping away insulation and creating potential ignition points. It is estimated that rodent-damaged wiring is responsible for a meaningful percentage of unexplained house fires. They also damage insulation, ductwork, stored items, and personal property.

Mouse allergens (from urine, droppings, and dander) are a documented asthma trigger, particularly in children. Mice also introduce fleas, ticks, and mites into homes, potentially creating secondary pest problems. A single pair of mice can produce 5-10 litters per year with 5-6 pups each, meaning a small problem can grow very quickly if not addressed.

Mice are one rodent issue where homeowners can often have success with DIY methods if the infestation is caught early. Snap traps remain the most effective DIY tool - they are inexpensive, lethal, and allow you to confirm kills. Place them perpendicular to walls with the trigger end against the baseboard, baited with peanut butter. Use multiple traps (at least 6-12 even for a small problem).

Seal entry points as you trap. Use steel wool stuffed into gaps and sealed with caulk, copper mesh, or hardware cloth for larger openings. Remember that mice can squeeze through a 1/4-inch gap, so be thorough. Focus on areas where utility lines enter the home, around doors and garage seals, foundation cracks, and where siding meets the foundation.

Call a professional when: you hear mice in walls or attics (hard to access), you continue catching mice after two weeks of trapping, the infestation is in a commercial property, you suspect roof rats instead of mice, or you need help identifying and sealing all entry points. Professionals use exclusion (sealing), trapping, and sometimes rodenticide placed in tamper-resistant stations. They also inspect for the full extent of the infestation and identify conditions attracting rodents.

Exclusion is the most important prevention strategy. Walk around your home's exterior looking for any gap, crack, or hole 1/4 inch or larger. Common entry points include where utilities enter the building, gaps under doors, damaged vent screens, weep holes in brick, and openings around pipes. Seal these with steel wool and caulk, hardware cloth, or metal flashing.

Reduce food sources. Store pantry items in glass or metal containers with tight lids. Clean up crumbs and spills promptly. Do not leave pet food out overnight. Keep garbage in sealed containers. Outdoors, clean up fallen birdseed, remove fruit that has fallen from trees, and secure compost bins.

Reduce shelter and nesting opportunities. Keep storage areas organized and off the floor. Trim vegetation and tree branches away from the house. Store firewood at least 20 feet from the home and elevated off the ground. In garages and sheds, minimize clutter and store items in plastic bins rather than cardboard boxes. Consider keeping a few snap traps set in attics, garages, and basements as early-warning monitors even when no active problem exists.

Professional mouse control typically costs $200-$600 for an initial service that includes inspection, trapping, and basic exclusion. More comprehensive exclusion work (sealing all entry points) can add $500-$2,000 depending on the home's construction and the number of entry points that need to be sealed.

Ongoing rodent monitoring and prevention plans run $200-$500 per year with quarterly or monthly service visits. Factors affecting cost include the severity of the infestation, accessibility of affected areas (attic and crawl space work costs more), the extent of exclusion needed, and whether contaminated insulation needs to be removed and replaced. Most companies offer free inspections and estimates.

See our full Rodent Control Cost Guide for detailed pricing by method.