The short version
Most rodent jobs in St. Louis cost a few hundred dollars up to about $1,500. That usually covers inspection, trapping and sealing. Attic cleanup is extra.
- Most rodent jobs in St. Louis cost a few hundred dollars to about $1,500.
- Inspections usually cost $75–$250.
- Sealing the gaps is what keeps rodents out.
- Attic cleanup is usually priced separately.
- Compare what each quote seals, not just the total.
Homeowners, renters and landlords in St. Louis who are hearing, seeing or smelling signs of rodents.
What to look for
Rodents are mostly unseen. You hear them at night and find droppings by morning. A mouse fits through a gap the size of a dime. In St. Louis, mice usually start moving indoors in October and November, as nights get colder. Seeing one in daylight usually means there are more.
- 1Rodent hair or droppings inside HVAC ducts.
- 2Live sighting, especially during the day.
- 3Burrow holes along the foundation, deck, or shed.
- 4Fresh gnaw marks on door corners or garage weatherstripping.
- 5Scratching or scurrying sounds in walls or ceilings at night.
- 6Tracks or tail drag marks in dust or flour.
Why it’s worth acting soon
- Mice breed fast, every few weeks.
- Droppings and urine contaminate food and insulation.
- Gnawed wiring can be a fire risk.
- Nests and odor get harder to clean the longer they stay.
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Estimate rodent control cost in St. Louis
Adjust for your situation to see a ballpark range.
Estimated range
A rough guide only. Your quote depends on your house and what the inspection finds.
Treatment options and typical costs
Inspection and Entry-Point Mapping
$75–$250
An inspection starts outside. The pro checks the foundation, roofline and utility gaps. Then they check attics, crawlspaces and appliances inside.
- Time
- 60–90 minutes
- Best for
- Every job; nothing else works without it
Tamper-Resistant Exterior Bait Stations
$100–$300 setup, $40–$80 per service visit
Bait stations belong outside, not in the attic. A St. Louis pro places them along fence lines, near sheds, and beside foundations where rats travel, then services them monthly or quarterly.
- Time
- 30–45 minutes per visit, ongoing
- Best for
- Outdoor rat pressure; ongoing perimeter protection
Attic and Crawlspace Cleanup and Sanitation
$500–$3,000, higher if insulation is replaced
Soaked or matted insulation usually has to be replaced. That drives the top of the range in St. Louis, so ask for a separate line item for insulation.
- Time
- Half day to two days
- Best for
- Heavy contamination; odor, urine-soaked insulation, nesting
Snap-Trap Program
$150–$400 per visit
Rats are neophobic and may avoid new objects for days, so St. Louis pros often pre-bait unset traps first. Mice are curious and usually hit traps the first night.
- Time
- 30–60 minutes per visit, 2–4 visits
- Best for
- Active indoor infestations; fast results you can see
Prices are typical published ranges. Ask what’s included before you compare quotes.
Rats can travel plumbing, so a sink or floor drain with a missing strainer is worth fixing; a tight strainer or grate keeps them out.What rodent control costs in St. Louis.
- Attic and Crawlspace Cleanup and Sanitation: $500–$3,000, higher if insulation is replaced - Tamper-Resistant Exterior Bait Stations: $100–$300 setup, $40–$80 per service visit - Inspection and Entry-Point Mapping: $75–$250 - A typical home in St. Louis is worth around $165k. Sealing the gaps protects that, and it's the part that lasts. Basement homes need utility gaps and window wells sealed. - Snap-Trap Program: $150–$400 per visit
Which rodents live around St. Louis.
They're small, curious and breed quickly. Norway rats are the other usual suspect. They burrow along foundations and enter low. House mice are the most common rodent in St. Louis homes.
Fall is when rodents head indoors. Leaf piles against the foundation hide burrows and gaps, so clear them and walk the wall before the first cold snap.When they move in.
Check for gaps before then. In St. Small problems grow fast. Spring is breeding season.
How they get into houses here.
Look at the dryer vent flap. Window wells need covers or screens. Homes from St. Louis out to Florissant and Kirkwood share the same weak spots, so the checklist below works across the area. Plenty of homes in St. Louis have basements. Rodents use gaps around utility lines, dryer vents and window wells. Check where pipes and cables enter.
A year of rodents in St. Louis.
- Spring: breeding season. Act on any sign quickly. - Winter: with lows near 24°F in St. Louis, check the attic, garage and pantry for droppings. - Fall: rodents look for shelter. Seal gaps before cold nights arrive. - Summer: with highs around 89°F in St. Louis, rodents look for water. Fix drips and leaks.
Mice or rats?
- Behavior: mice are curious about new traps. Rats avoid them for days. - Sounds: mice sound light and quick. Rats sound heavier. - Holes: mice chew dime-sized holes. Rats chew holes closer to quarter-sized. - Droppings: mouse droppings are rice-sized. Rat droppings are two or three times bigger. - Rub marks: rats leave greasy smudges along walls and beams.
Sealing small gaps yourself.
- Expanding foam: fine on top of mesh, useless on its own. - Door sweeps: close the gap under garage and exterior doors. - Hardware cloth: use quarter-inch mesh over vents and larger holes. - Sealant or mortar: cover the mesh so it stays put. - Steel wool or copper mesh: pack it into small gaps first. - Check your work: daylight through a gap means it isn’t sealed.
Cleaning up droppings safely.
- Don’t sweep or vacuum droppings dry. It stirs up dust. - Wipe up with paper towels and bag them. - Spray droppings with a bleach solution, then wait five minutes. - Wear rubber or plastic gloves. - Air the room out for 30 minutes first. - Wash your gloved hands, then your hands.
What happens at an inspection.
They check the foundation, vents, rooflines and utility gaps. The inspector walks the outside first. Most inspections take about an hour. Photos help. You should come away with a list of entry points. Inside, they check the kitchen, garage and attic.
Rodents in the car.
Park in a closed garage when you can. Mice and rats nest in engine bays and chew wiring. Clear birdseed and pet food from the garage. Check the air filter box for nesting.
Bird feeders and rodents.
Use a seed tray and sweep up spills. Spilled seed feeds mice and rats. Store seed in a metal can with a tight lid. If rodents show up, bring feeders in at night.
Questions to ask before you sign.
- Is cleanup included, or extra? - What happens if they come back? - How many trap visits are included? - Which gaps will you seal, and with what? - Where are they getting in? - Will you use poison inside? (Ask them not to.)
Ways to keep the cost down.
- Act early, before rodents spread to the attic. - Trim branches back from the roof. - Store food and pet food in sealed bins. - Clear clutter so gaps are easy to reach. - Compare what each quote seals, not just the price.
Rodents by the numbers.
For St. Louis homes, those three findings — species, entry points, and scale — are what a quote should be built on, not a regional average. For St. Louis, ask any provider to show you the entry points and the plan before you compare numbers. National surveys set rough expectations but cannot diagnose one house. In St. Louis homes, what actually matters is a walk-through: where the droppings are, how the rodents are getting in, and how large the colony is.
What affects the price
- Emergency or short-notice scheduling.
- Follow-up visits included versus billed separately.
- Age of the home and condition of the foundation.
- Exterior bait stations and ongoing service frequency.
- Materials used for sealing: mesh, sheet metal, mortar.
- Sewer line inspection if rats are entering underground.
- Crawlspace or slab; crawlspaces add labor.
- Whether sheds, garages or other outbuildings are included.
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What's your biggest concern about rodent control costs?
When to call for help
Call right away if you see rats. They take a longer, more careful approach. Attic cleanup is hard to do safely without training. Call if you hear them in the attic or walls. Droppings in several rooms are another sign. So is a dead-rodent smell.
What you can do yourself
Seal small gaps with steel wool and sealant. Rooflines, vents and attics are harder. That's where a pro's sealing work pays off. Start tonight with snap traps along the walls. Bait them with peanut butter. Store food in sealed bins.
Rodents in St. Louis
Louis is worth around $165k, and chewed wiring or soiled insulation can get expensive. Louis, rats travel along alleys, fences and utility lines, so neighbors often share the problem. In denser parts of St. Louis, and that cold is what sends mice looking for a way in. Winter lows average around 24°F in St. Louis gives rodents plenty of water, so food and shelter are what you control. With about 42 inches of rain a year, St.
Local research
Rodents in St. Louis, MO: what the public record shows
Before you compare quotes, it helps to know which rodents actually live in Missouri, when they are busiest around St. Louis, and what the state figures look like. Everything below links to the agency or university page it came from.
Rodent species recorded in Missouri
- House mouse (Mus musculus) — Enters at 1/4 inch; 5-10 litters per year; eats about 200 small meals a night.
- Norway rat (Rattus norvegicus) — Burrowing rat of basements, sewers and ground floors; tail shorter than head plus body.
- Deer mouse (Peromyscus maniculatus) — Primary U.S. hantavirus carrier; lives throughout Washington and the interior West.
When rodents are busiest around St. Louis
Fall entry; winter infestations. Upper Midwest and Northeast: mice in walls and garages all winter.
Based on St. Louis’s humid continental climate profile.
MU Extension treats the Norway rat as Missouri's structural rat, in and around both towns and farms.
For context, nationally
- 1/4 inch (the width of a pencil) — Smallest gap a mouse can enter. CDC
- 890; 35% fatal; 94% west of the Mississippi — Hantavirus cases reported since 1993 (through 2023). CDC
Sources: University of Missouri Extension; CDC; Pest Notes: House Mouse; Pest Notes: Rats; Hantavirus. Figures are quoted as the source prints them. How we check our sources
Simple ways to keep rodents away
- Move compost bins away from the house and use closed models.
- Cover dryer and exhaust vents with metal louvered covers.
- Seal every gap larger than a quarter inch with metal mesh.
- Walk the exterior each season looking for fresh gnawing.
- Keep grass short and remove tall weeds along fences.
- Fix leaking hoses, faucets, and irrigation heads.
In a multi-unit building, mice move between apartments through shared walls and pipe chases, so treating one unit rarely solves it. Ask for a building-wide plan.Did you know?
A house mouse can jump about a foot straight up.
For St. Louis homes, a rodent's front teeth never stop growing, so it gnaws constantly to keep them worn down.
Questions people ask
What do exterior bait stations cost?
Usually a setup fee plus a monthly or quarterly service charge. Ask how many stations they'll use and how often they're checked.
What does a rodent inspection cost?
It's worth asking. Some companies credit it toward the job if you go ahead. Usually $75–$250.
Why is rodent-proofing so expensive?
A typical house has dozens of small openings. Every gap needs metal mesh or sheet metal, then a seal. It's careful, slow work.
How much does rodent control cost in St. Louis?
Attic cleanup costs extra. Louis run a few hundred to about $1,500. Most full jobs in St.
What should be in a rodent control quote?
Cleanup should be listed separately. It should say what happens if they return. Entry points, sealing materials and the number of trap visits.
How do I choose a rodent control company?
A good company talks about sealing, not just traps. Ask what happens if rodents come back. Ask how they seal gaps and what materials they use. Make sure they're licensed in Missouri.
Are rats a bigger problem than mice?
They also tend to need more sealing work outside. Rats are bigger, chew more, and avoid new traps for days. Usually.
Do homes with rodents usually have other pests too?
Census Bureau's 2019 American Housing Survey (AHS), a signal about shared entry points. homes reported both rodents and cockroaches in the U.S. Pests tend to travel together, and 2.9 million occupied U.S. Often enough to matter.
How common are rodent problems in U.S. homes?
homeowners told a September 2022 Harris Poll for the National Pest Management Association (NPMA) that they had encountered or had a problem with rodents at some point. Forty-nine percent of U.S. Very common.
Are rodents a problem in St. Louis?
House mice cause most problems. In St. They're common here, as almost everywhere.
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Sources (11)
The facts in this article come from the public sources listed above. Every home is different, so ask the company you talk to about pricing and what’s included. Published by Rodent Exterminator · Updated September 11, 2026 · How we write these guides