How to Get Rid of Mice in Your House: Traps, Exclusion & When to Call a Pro

Mice are among the most common household pests in North America, and one of the most frustrating to eliminate. A single female mouse can produce 5–10 litters per year, with 5–6 pups per litter. Under favorable conditions — warmth, food access, nesting materials — a small mouse presence in October can become a full infestation by December.

The difficulty in eliminating mice is not just their reproductive rate. It is their behavioral adaptability. Mice are neophobic — they are instinctively cautious around new objects in their environment, including traps. They learn quickly, have excellent spatial memory, and can survive on remarkably small amounts of food (3 grams per day). They can squeeze through any gap or hole larger than a dime (approximately 6–7mm).

The only effective long-term solution combines three elements: **exclusion** (sealing entry points), **elimination** (trapping), and **sanitation** (removing food and harborage). Missing any one of these elements means the problem continues or returns.

Before choosing a treatment approach, confirm that mice are the actual problem and assess the approximate scale of the infestation:

Trapping mice without sealing the entry points that allowed them in is a losing battle — you will trap continuously without resolving the source. Exclusion should happen in parallel with trapping, not after.

**Common entry points:** - Gaps around pipes where they enter through walls (under sinks, behind appliances) - Foundation cracks larger than 6mm - Gaps between the sill plate (bottom of wall framing) and the foundation - Utility conduit entry points in the basement or crawl space - Spaces around door frames, especially garage doors - Vents without proper screening (dryer vents, crawl space vents) - Gaps around chimney flashing and roof penetrations

Conduct a thorough exterior inspection. Walk the full perimeter of the foundation at ground level, look at every utility penetration, and check around all doors and windows. Common overlooked entry points include gaps under garage doors, gaps in brick mortar, and spaces where wood siding meets the foundation.

Trapping (not poisoning) is the recommended elimination method inside the home for several reasons: it provides physical confirmation of success, prevents mice from dying in wall voids and creating odor problems, and poses no risk to pets or children. Multiple trap types are available:

**Snap traps (most effective):** Classic snap traps and modern versions like the T-Rex snap trap are the gold standard. When used correctly with proper placement, they are highly effective and kill quickly.

Placement is critical: traps must be placed **perpendicular to the wall** with the trigger end touching the wall. Mice travel along walls and baseboards, not across open floor. Set traps every 2–3 feet along walls where you have evidence of activity.

**Electronic traps:** Battery-powered traps deliver a high-voltage shock that kills mice instantly. More expensive per unit but effective and hygienic (no mess). Good option for areas where snap trap reset is inconvenient.

**Glue traps:** Not recommended. Mice caught in glue traps suffer prolonged deaths and are difficult to dispose of humanely. They also pose a risk to non-target animals and can capture beneficial species. Many pest control professionals have moved away from recommending them.

Mice will persist in any environment that provides food, water, and nesting sites. Sanitation removes these attractants and makes trapping more effective by limiting alternative food sources.

**Food storage:** - Transfer dry goods (flour, grains, cereals, pet food) from cardboard or thin plastic packaging into airtight glass or heavy-duty plastic containers with snap lids. Cardboard is no obstacle to mice. - Do not leave pet food out overnight. - Clean up food debris promptly, including under appliances. - Birdseed stored in garages or outbuildings is a primary mouse attractant — store in metal containers with tight lids.

**Clutter and harborage:** - Reduce clutter in basements, garages, and storage areas. Cardboard boxes, paper bags, and fabric piles are both nesting material and harborage. - Stack firewood away from the house and off the ground. - Keep grass and shrubs trimmed away from the foundation.

**Water sources:** Mice can survive on very little water and often get it from the food they eat, so water source elimination is less impactful than food and harborage reduction — but leaking pipes and standing water in crawl spaces do contribute to an environment that supports mice.

DIY mouse control is feasible for minor infestations caught early — a few mice that entered recently, limited droppings, clear and accessible entry points. However, professional pest control is the better choice when:

**The infestation is large.** Many droppings throughout the home, evidence of multiple nesting sites, and mice visible during daytime all suggest a significant population that requires a systematic approach.

**You cannot locate or access the entry points.** Pest control professionals bring experience identifying non-obvious entry points and can conduct exclusion work that is difficult for homeowners — including sealing under slab gaps, treating crawl spaces, and working at roof level.

**The infestation involves your HVAC system, attic, or crawl space.** These areas present health risks (hantavirus from mouse droppings is a concern in disturbed, dried feces) and require proper PPE and containment protocols.

**DIY efforts have not worked after 2–3 weeks.** If you have set traps, sealed visible gaps, and addressed sanitation but are still finding fresh droppings daily, a professional is needed. The entry point is almost certainly somewhere you have not found.

**You have a health-sensitive household.** Families with young children, elderly members, or immunocompromised individuals should minimize DIY disturbance of infested areas.

A licensed pest control company will conduct a full inspection, identify entry points, install a trap/bait station program, and offer ongoing monitoring. For significant infestations, a multi-visit service program over 30–60 days is typical.