The house mouse is the most common rodent we treat in Chicago homes, especially as temperatures drop each fall. A single mouse squeezing through a dime-sized gap can multiply into dozens by spring — chewing wiring, contaminating pantries, and damaging insulation.
What Do House Mice Look Like?
Adult house mice are small (2.5–4 inches long, not counting tail) with light brown to gray fur, a lighter dusty-gray belly, large rounded ears, a pointed snout, and small black eyes. Droppings are about 1/8 inch long, dark, and shaped like grains of rice.
Where Do House Mice Hide?
House mice nest within 30 feet of a food source. In Chicago they hide inside walls, behind stoves and refrigerators, in attic insulation, basement clutter, garages, under sinks, and inside stored boxes. Entry points are usually around plumbing, gas lines, dryer vents, and basement window frames.
Signs of a House Mouse Infestation
Telltale signs include droppings along baseboards and inside drawers, gnaw marks on food packaging, scratching or scampering inside walls at night, urine odor, and small piles of nesting material like shredded paper or insulation.
Health Risks of House Mice
Mice contaminate food and food-prep surfaces with urine and droppings, can carry Salmonella and hantavirus, and the dust from dried droppings can trigger asthma. Their constant gnawing on electrical wiring is also a known fire hazard.
How Sleep Tight Treats House Mice in Chicago
Sleep Tight combines snap-trap monitoring with exclusion — sealing every entry point with steel-reinforced materials mice cannot chew through. Without exclusion, trapping alone never solves the problem. Most Chicago jobs are clear within 2–3 weeks.
Need help with house mice in Chicago?
Sleep Tight Pest Control offers same-day chicago rodent control across every Chicago neighborhood and suburb. Call (773) 240-5932 or get a free quote online.
Frequently Asked Questions
How small a gap can a mouse fit through?
A house mouse can squeeze through any opening larger than a quarter inch — about the diameter of a #2 pencil.
Will mice leave on their own?
No. Once mice find food and shelter they reproduce rapidly — a single pair can produce 50+ offspring per year.
Is poison the fastest way to get rid of mice?
We avoid interior rodenticides — mice often die inside walls and create odor and secondary pest problems. Snap traps plus exclusion work faster and cleaner.
How long until mice are gone?
Most Sleep Tight mouse jobs in Chicago are clear within 2–3 weeks once exclusion and trapping are complete.