Rodent Control in Illinois: Mice and Rats

Droppings in a drawer, scratching in the walls at night, or chewed food packages. Here's how mice and rats get into Illinois homes, what professional rodent control involves, and what it costs.

Free referral anywhere in Illinois — Call (217) 626-5123

Illinois pest control businesses must be licensed by IDPH
Each licensed business must employ a certified technician
A mouse can slip through a gap a pencil fits into (IDPH)
Illinois termites swarm mostly in spring, but any warm month (U of I Extension)

Last updated: 2026-10-11

Illinois Pest Control is an independent referral service that connects Illinois property owners with participating providers for rodent control, including mouse extermination and rat control. In most Illinois homes the problem is the house mouse, which the Illinois Department of Public Health calls the most common rodent in developed areas.

Signs of mice and rats

According to IDPH, droppings, fresh gnawing, and tracks show where mice are active, and nests made of finely shredded paper or other fibers turn up in sheltered spots. Other common signs:

Scratching or scurrying in walls or ceilings, often at night.
Chewed food packaging in pantries and cabinets.
Grease marks along walls and baseboards where rodents travel.
A musky odor in enclosed spaces.
Pets suddenly interested in one spot by a wall or appliance.

How rodents get in

IDPH says a mouse can slip through a crack a pencil fits into, just over 1/4 inch. Gaps around pipes, gas and electric lines, dryer vents, garage doors, and foundation cracks are common entry points. Rats need bigger openings but can widen gaps by gnawing.

Once inside, mice multiply quickly: IDPH notes a female can have five to 10 litters a year of usually five or six young each. That's why a few droppings shouldn't be ignored, and why Illinois' cold months, when rodents look for warm shelter, are a common time for problems to start.

Exclusion: the part that keeps them out

IDPH's guidance on mice rests on three things: sanitation to remove food and shelter, "mouse-proof construction" to seal openings, and population reduction with traps or baits when an infestation exists. Trapping alone doesn't stop new mice from coming in. Professional exclusion means finding and sealing entry points with durable materials like metal mesh, sheet metal, or concrete, not foam alone, which rodents can chew through.

Ask any provider whether exclusion is included in the price or quoted separately. HomeAdvisor puts rodent exclusion at $200 to $600 on its own.

Safety

Don't handle dead rodents, nests, or droppings with bare hands, and don't sweep or vacuum droppings dry, which can stir up dust. If you use traps or baits yourself, keep them away from children and pets and follow the label exactly. Rodenticide baits should be in tamper-resistant stations. For anything larger than mice and rats, such as raccoons or other wildlife, don't try to handle the animal yourself.

When to call about mice or rats

You find droppings in more than one room or on more than one floor.
You hear activity in walls or ceilings.
You've trapped mice but keep catching more.
You see rats, or burrows along the foundation.
You manage a rental, restaurant, or business with rodent activity.

What rodent control costs

HomeAdvisor's June 2026 data puts professional rat extermination at an average of $395, with most jobs between $189 and $655, and lists mice or rats at $180 to $600 in its general pest guide. Exclusion, sealing the entry points, runs $200 to $600. These are national figures; the size of the home and the number of entry points drive the price.

Mice vs. rats: rat work can involve larger openings and outdoor burrows.
Number of entry points to seal.
Follow-up visits to check traps or bait stations.
Cleanup and sanitation of contaminated areas, often extra.
Ongoing monitoring plans for businesses and rentals.

Technician sealing a small gap around a utility line with metal mesh to keep mice out

What you can do right now

Move food, birdseed, and pet food into sealed containers.
Note where you find droppings or damage.
Look for gaps around pipes, vents, and doors, especially low on exterior walls.
Don't sweep up droppings dry; ask a professional about safe cleanup.
Call and ask whether the quote includes exclusion.

Questions to ask before you hire

Is your business licensed by the Illinois Department of Public Health, and what is the license number? Who is the certified technician?
Will you find and seal the entry points, and is that included?
Will you use traps, bait stations, or both, and where will they be placed?
How many follow-up visits are included?
What precautions should we take with children and pets?

Related pest control guides

Straight answers

What you can do vs. when to call a professional

Prevention is mostly housekeeping and sealing gaps. Persistent, spreading, or structural problems are where a licensed professional earns the call.

What you are seeing	What you can do now	When to call a professional
A few ants in the kitchen	Clean up food and crumbs, store food sealed, wipe the trail, fix leaks	They keep coming back, or you see large black ants near wood (possible carpenter ants)
Mouse droppings or gnawing	Store food in sealed containers; look for gaps around pipes, doors, and vents	Droppings in several rooms, nests, noise in walls, or it continues after sealing
Winged insects swarming indoors in spring	Save a few in a sealed bag or photograph them	Always: swarmers indoors can mean termites. Get an inspection
Mud tubes on the foundation	Leave them alone and photograph them	Always: these are a sign of subterranean termites
Bites, blood spots, or dark specks on bedding	Wash and dry bedding hot; do not move furniture to other rooms	Always: IDPH says an experienced professional is usually better than doing it yourself
Cockroaches seen in daylight	Remove food and water sources; reduce clutter	They keep appearing, or you see them in daytime, which can mean a larger population

General guidance, not a diagnosis. Prevention approach follows theEPA Citizen's Guide to Pest Control and Pesticide Safety. If you use any pesticide yourself, follow the label exactly.

What to expect

What professional rodent control usually involves

Every home and every pest problem is different. These are the stages most professional pest control follows.

Inspection
A pest control professional looks for the pest, the evidence (droppings, damage, trails, live insects), how it is getting in, and what is attracting it: food, water, clutter, or gaps in the building.
A treatment plan and a price
Ask for the plan, the products or methods involved, any preparation you need to do, and the price before work begins. Illinois requires the business to be licensed by the Illinois Department of Public Health (IDPH) and to employ a certified technician.
Treatment and exclusion
Depending on the pest, this can mean baits, traps, targeted applications, or sealing entry points (exclusion). The EPA recommends integrated pest management (IPM), which combines methods and puts prevention first.
Follow-up and monitoring
Many problems need more than one visit. Ask what follow-up is included, how results are checked, and what to do between visits.
Prevention
The provider should explain what will keep the problem from coming back: sealing gaps, fixing moisture, storing food, and reducing clutter. No treatment can guarantee pests never return.

How the referral works

How our contractor-matching service works

You call the number on this site
Have the address or ZIP code ready, plus what you are seeing: the pest, where, how long, and anything you have already tried.
Your call is routed to a participating provider
Your call is connected with a participating independent pest control professional who serves your area, if one is available. We do not send anyone ourselves.
You deal with that provider directly
The provider inspects, recommends a plan, quotes the price, and does any work you agree to under their own business name, IDPH license, and insurance. You decide whether to hire them; there is no obligation.

Good to know: availability and eligible services depend on which participating providers cover your ZIP code. Whoever you hire, ask for their IDPH business license number and check it with the IDPH Pest Control Business Search. Our hiring questions cover the rest.

Get Help With Mice or Rats

Call and we will try to connect you with a participating independent pest control provider who serves your area.

Call (217) 626-5123

Questions

Rodent Control questions

How much does a mouse exterminator cost in Illinois?

HomeAdvisor's June 2026 national data puts rodent extermination at $189 to $655, averaging $395, with exclusion (sealing entry points) at $200 to $600. The size of the home and number of entry points drive the price.

How small a hole can a mouse get through?

The Illinois Department of Public Health says a mouse can slip through a crack a pencil will fit into, slightly larger than 1/4 inch.

If I see one mouse, are there more?

Often. IDPH notes a female house mouse can have five to 10 litters a year of five or six young each, so a single sighting can mean an established population. Check for droppings in several places.

Is trapping enough to get rid of mice?

Usually not on its own. IDPH's approach combines sanitation, sealing openings, and trapping or baiting. Without sealing entry points, new mice keep coming in.

Should I handle wildlife like raccoons myself?

No. Don't try to handle wildlife yourself. Wildlife removal is a separate specialty from rodent control; ask whether a provider handles it.

Related pest control services

General Pest Control

Ants in the kitchen, spiders in the basement, a mouse in the garage, or something you can't identify. Here's what a general pest control service covers, how plans work, and what it typically costs.

Cockroach Control

Roaches scattering when you turn on the kitchen light, droppings under the sink, or a musty smell in the cabinets. Here's what attracts cockroaches and what professional control involves.

Ant Control

A trail across the kitchen counter, ants coming up through a slab crack, or large black ants near a damp window frame. Here's how to tell common ants apart and when a professional makes sense.