The short version
Trap the ones inside, then seal the gaps. An inspection usually costs $75–$250.
- Look for droppings, gnaw marks and night-time scratching.
- For Dover homes, mice usually start moving indoors in September and October, as nights get colder.
- Traps remove them; sealing keeps them out.
- Never sweep or vacuum droppings dry.
Anyone in Dover dealing with mice or rats, or hoping to keep them out.
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. Seeing one in daylight usually means there are more.
- 1Gnaw marks on food packaging, wood trim, or wiring.
- 2A musky or ammonia-like smell in closed rooms.
- 3Pets staring at or pawing at a wall or appliance.
- 4Droppings in drawers, pantries, under sinks, or along walls.
- 5Shredded paper, fabric, or insulation gathered into a nest.
- 6Chewed holes in the bottom of cabinets or drawers.
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.
Treatment options and typical costs
Inspection and Entry-Point Mapping
$75–$250
First, the pro maps where rodents get in. That map guides the traps and sealing.
- 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
Not every Dover home needs stations; a mouse problem inside rarely does. They fit best where rats burrow outside or neighbors have activity.
- Time
- 30–45 minutes per visit, ongoing
- Best for
- Outdoor rat pressure; ongoing perimeter protection
Follow-Up Monitoring
$50–$150 per visit, or included in a plan
Ask what happens if activity returns during the monitoring period. Many re-trap and re-seal under the same agreement. Confirm first.
- Time
- 20–40 minutes per visit
- Best for
- Confirming the house stays clear after treatment
Snap-Trap Program
$150–$400 per visit
Placement matters more than bait. Rodents run along edges, so traps in Dover attics and kitchens go perpendicular to walls, in the dark corners where droppings cluster.
- 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.
Bathroom vanities hide the same plumbing gaps as the kitchen. A quick look with a flashlight shows droppings or rub marks long before you see a mouse.Which rodents live around Dover.
Norway rats are the other usual suspect. They burrow along foundations and enter low. House mice are the most common rodent in Dover homes. They're small, curious and breed quickly.
When they move in.
Spring is breeding season. Small problems grow fast. Check for gaps before then.
A metal vent cover with a working flap keeps mice out all winter. Plastic flaps crack in the cold and get chewed open.How they get into houses here.
Look at the dryer vent flap. Window wells need covers or screens. Homes from Dover out to Rochester and Portsmouth share the same weak spots, so the checklist below works across the area. Plenty of homes in Dover have basements. Rodents use gaps around utility lines, dryer vents and window wells. Check where pipes and cables enter.
A year of rodents in Dover.
- Winter: with lows near 15°F in Dover, check the attic, garage and pantry for droppings. - Spring: breeding season. Act on any sign quickly. - Summer: with highs around 81°F in Dover, rodents look for water. Fix drips and leaks. - Fall: mice move indoors as nights cool. Seal gaps in September.
Mice or rats?
- Holes: mice chew dime-sized holes. Rats chew holes closer to quarter-sized. - Sounds: mice sound light and quick. Rats sound heavier. - Behavior: mice are curious about new traps. Rats avoid them for days. - Rub marks: rats leave greasy smudges along walls and beams. - Droppings: mouse droppings are rice-sized. Rat droppings are two or three times bigger.
Sealing small gaps yourself.
- Sealant or mortar: cover the mesh so it stays put. - Hardware cloth: use quarter-inch mesh over vents and larger holes. - Door sweeps: close the gap under garage and exterior doors. - Expanding foam: fine on top of mesh, useless on its own. - Check your work: daylight through a gap means it isn’t sealed. - Steel wool or copper mesh: pack it into small gaps first.
Cleaning up droppings safely.
- Wear rubber or plastic gloves. - Spray droppings with a bleach solution, then wait five minutes. - Wipe up with paper towels and bag them. - Don’t sweep or vacuum droppings dry. It stirs up dust. - Wash your gloved hands, then your hands. - Air the room out for 30 minutes first.
What happens at an inspection.
Inside, they check the kitchen, garage and attic. You should come away with a list of entry points. Photos help. Most inspections take about an hour. The inspector walks the outside first. They check the foundation, vents, rooflines and utility gaps.
Rodents in the car.
Check the air filter box for nesting. Clear birdseed and pet food from the garage. Mice and rats nest in engine bays and chew wiring. Park in a closed garage when you can.
Bird feeders and rodents.
If rodents show up, bring feeders in at night. Store seed in a metal can with a tight lid. Spilled seed feeds mice and rats. Use a seed tray and sweep up spills.
Questions to ask before you sign.
- Which gaps will you seal, and with what? - How many trap visits are included? - What happens if they come back? - Is cleanup included, or extra? - Will you use poison inside? (Ask them not to.) - Where are they getting in?
Rodents by the numbers.
For Dover homes, those three findings — species, entry points, and scale — are what a quote should be built on, not a regional average. For Dover homes, 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. For Dover 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
- Mice versus rats; rats take longer and cost more.
- Materials used for sealing: mesh, sheet metal, mortar.
- Crawlspace or slab; crawlspaces add labor.
- Home size, stories, and roofline complexity.
- Exterior bait stations and ongoing service frequency.
- Outdoor pressure from creeks, alleys, or restaurants nearby.
📊
What's your biggest concern about rodents?
When to call for help
Attic cleanup is hard to do safely without training. They take a longer, more careful approach. Call right away if you see rats. So is a dead-rodent smell. Droppings in several rooms are another sign. Call if you hear them in the attic or walls.
What you can do yourself
Start tonight with snap traps along the walls. Bait them with peanut butter. Store food in sealed bins. Seal small gaps with steel wool and sealant. Rooflines, vents and attics are harder. That's where a pro's sealing work pays off.
Rodents in Dover
Dover gets about 46 inches of rain a year, and heavy storms flood burrows, which pushes rats toward buildings. Winter lows average around 15°F in Dover, and that cold is what sends mice looking for a way in. In Dover's neighborhoods, woodpiles, fences, bird feeders and gardens draw rodents close to the house. A typical home in Dover is worth around $380k, and chewed wiring or soiled insulation can get expensive. For Dover homes, the humid continental climate means rodents activity tends to follow fall and winter (rodents move indoors for warmth), so scheduling the visit before the busy stretch usually means a faster response and a cleaner quote.
Local research
Rodents in Dover, NH: what the public record shows
Before you compare quotes, it helps to know which rodents actually live in New Hampshire, when they are busiest around Dover, and what the state figures look like. Everything below links to the agency or university page it came from.
Wildlife tested that had rodenticide exposure
Necropsies at the NH Veterinary Diagnostic Laboratory found exposure statewide, often to long-acting second-generation anticoagulants.
University of New Hampshire ExtensionDays from a lethal anticoagulant dose to death
Rodents keep feeding after taking a lethal dose, so carcasses carry far more poison than one dose to hawks, owls and pets.
University of New Hampshire ExtensionRodent species recorded in New Hampshire
- 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 Dover
Fall entry; winter infestations. Upper Midwest and Northeast: mice in walls and garages all winter.
Based on Dover’s humid continental climate profile.
UNH Extension pushes trapping and exclusion over bait because of documented secondary poisoning in New Hampshire raptors.
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 New Hampshire 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
- Inspect vehicle engine bays if parked near fields or woods.
- Seal every gap larger than a quarter inch with metal mesh.
- Fit garage doors with tight bottom seals and corner guards.
- Move compost bins away from the house and use closed models.
- Check crawlspace doors and vents for chewed openings each fall.
- Trim tree branches at least six feet from the roof.
A good rodent quote lists the inspection, the number of trapping visits, each opening to be sealed and the material for it, and any cleanup.Did you know?
A mouse's heart beats around 500 times a minute.
Male house mice sing ultrasonic songs that humans can't hear.
Questions people ask
What is rodent-proofing and why does it cost so much?
It means sealing every gap with metal mesh and sealant. A mouse fits through a dime-sized gap, so it's slow work. It's also the part that keeps them out.
What does a rodent inspection involve?
The inspector checks the outside walls, roofline, vents and utility gaps. Inside, they look at the kitchen, attic, garage and under sinks. You should get a list of entry points.
How do I know if I have mice or rats?
Check the droppings. Mouse droppings are about the size of a rice grain. Rats also chew larger holes and sound heavier at night.
Do I need to replace attic insulation?
Only if it's heavily soiled or flattened by nesting. Light activity can often be cleaned up. Ask the inspector to show you before you agree to replacement.
Can I just seal the holes myself?
Small gaps, yes. Use steel wool or copper mesh, then seal over it. Foam alone won't stop them. Rooflines and vents are harder, and that's where a pro helps.
How many homes have a full rodent infestation?
In the National Pest Management Association's (NPMA) September 2022 Harris Poll of more than 1,300 U.S. homeowners, 14% reported a multiple-rodent infestation over their lifetime, far fewer than the 37% who recalled a single animal.
Do homes with rodents usually have other pests too?
Often enough to matter. Two point nine million occupied U.S. homes reported seeing both rodents and cockroaches in the previous 12 months, according to the U.S. Census Bureau's 2019 American Housing Survey (AHS). Expect a good pro in Dover to connect their plan to what they actually found at your home.
Are rodents a problem in Dover?
They're common here, as almost everywhere. House mice cause most problems.
Nearby cities
Related guides
Sources (10)
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