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How to get rid of rats
If you searched how to get rid of rats, you do not have one pest. The United States has two commensal rats that use buildings: the Norway rat (brown rat, sewer rat) on the ground, and the roof rat (black rat, ship rat) in the canopy of a structure. The control map is different. This page is the decision guide. Open the matching species article for the full sequence.
Norway rat or roof rat?
A Norway rat is heavy, blunt-nosed, and built for burrows. It uses the lower third of a building: basements, crawlspaces, dumpster pads, broken sewer laterals, and the gap under an alley door. A roof rat is slimmer, longer-tailed, and built for fences, vines, citrus, palms, and soffits. It uses the upper third: attics, eaves, and overhead wires.
If you only remember one field rule: floor-level burrows and capsule droppings along a foundation are a Norway rat job. Noises in the ridge and gnawed fruit in a tree are a roof rat job. You can have both on one property. Bait stations on soil will not fix an attic roof-rat runway.
| Norway rat | Roof rat | |
|---|---|---|
| Also called | Brown rat, sewer rat | Black rat, ship rat, fruit rat |
| Where it lives | Ground, sewers, slabs, lower walls | Attics, vines, fences, tree canopy |
| Look | Heavy body, small ears, tail shorter than body | Sleek body, large ears, tail longer than body |
| Droppings | Capsule-shaped, about ¾ inch | Spindle-shaped, smaller |
| First move | Sanitation at grade, door sweeps, burrow mapping | Trim trees, screen vents, trap on beams |
Open the species page once you know which one you have. Do not buy a “rat kit” and guess.
Rat droppings or mouse droppings?
People mix these up and then under-trap. House-mouse droppings are ⅛–¼ inch, pointed, and scattered like grains of rice. Norway rat droppings are about ¾ inch, blunt capsules, often in groups along a wall. Roof rat pellets are smaller than Norway pellets but still larger than mouse pellets, and they show up in attics and rafters, not only in a kitchen drawer.
A mouse fits a gap about ¼ inch (a pencil). A rat needs about ½ inch (a quarter is the usual teaching size for Norway rats). If you are sealing pinholes and still hearing heavy thumps in a ceiling, you do not have a mouse.
Signs you actually have rats
Rats are nocturnal and shy of new objects. You will usually see evidence before you see the animal. Fresh droppings that are still dark and soft mean the runway is active. Grease rub marks along a baseboard or pipe are a commute, not a one-time visit. Gnawed plastic bins, door bottoms, and electrical cable are property damage, not a personality trait.
Outdoors, Norway rats leave burrows with smooth lips at dumpster pads and slab edges. A daylight rat is not a brave rat. It often means the colony is crowded. Pets staring at a wall or a stove kickplate are a clue, not a control method.
- Capsule or spindle droppings on runways, in attics, or behind appliances
- Rub marks, footprints in dust, or a stale musky odor in a closed room
- Burrows at foundations, or noises in lower walls (Norway) versus soffits (roof rat)
- Gnawed food packaging, fruit in trees, or chewed wiring
The control sequence that still works
Work in this order. Skipping inspection or exclusion is why traps “fail” and why poison comes back as a smell in a wall.
- Identify the species and the runway. Walk at dawn. Mark burrows, rub marks, attic grease, and the exact gap. That map is the treatment.
- Take away food and water. Close dumpsters, wash grease, pick up pet food, harvest fruit, and fix leaks. If the alley feeds them better than your bait, you lose.
- Seal with metal, not foam alone. Hardware cloth, mortar, door sweeps, and vent screens. Expanding foam without a metal core is a snack.
- Trap on the edge. Heavy snap traps perpendicular to walls on the actual runway. Pre-bait shy Norway rats. Put roof-rat traps on beams and fence lines, not only on a kitchen floor.
- Use labeled outdoor bait only if the site still needs it. Tamper-resistant stations, mapped, after sanitation. Indoor baiting leaves carcasses in voids. The EPA label is the law.
Traps or poison?
Inside an occupied building, snap traps plus exclusion are the usual first choice. You confirm the kill, you do not poison a dog, and you do not wait two weeks for a carcass in a wall cavity. Glue boards for rats are a welfare and non-target problem and are restricted in some jurisdictions. This directory does not treat them as the standard tool.
Rodenticides have a place on outdoor rat pressure around commercial sites when they sit in anchored, tamper-resistant stations on a labeled use site. They are overused in homes. First- and second-generation anticoagulant baits, and some non-anticoagulants, all carry pet, child, and raptor risk. EPA tightened consumer rodenticide packaging for that reason. Ultrasonic plug-in gadgets do not replace a door sweep. There is no reliable evidence they control an established colony.
Live-catch cages still require a legal, humane endpoint. Releasing a commensal rat on the next block is not control, and in many cities it is not legal.
What professional rat control costs in the United States
There is no national price list. Typical residential rodent work in US cities often lands around $150 to $400 for an initial inspection and first service, with one or more follow-up visits. Heavy exclusion — door sweeps, vent screens, masonry, or a sewer-camera job — is extra and can exceed the trapping fee. Attic roof-rat jobs with solar, blown insulation, or unknown wiring cost more because the labor is the risk, not the trap.
Multi-family buildings, food facilities, and properties with burrows undermining a slab should not be priced like a two-trap garage visit. Get the inspection notes in writing: species, runways, products (if any), and what you must seal. Monthly spraying with no findings is a red flag, not a program.
When DIY is not enough
You can clear a small, mapped infestation with sanitation, metal exclusion, and enough traps. Call a licensed operator when rats are in a stacked apartment, a restaurant, a school, or a building where children and pets share the voids; when burrows undermine a structure; when you cannot access the attic or crawlspace safely; or when two weeks of correctly placed traps have not dropped activity. Drain rats are a plumber plus pest-operator conversation, not a hardware-aisle conversation.
Cities sometimes run their own rodent programs with rules you must not contradict. Do not use illegal fumigants in burrows.
Starter kit after you know which rat
Norway rat on the floor, roof rat in the canopy. Use rat-sized traps. Measure the door gap. Glue boards and a plug-in repeller are listed too.
As an Amazon Associate, Pest Kill earns from qualifying purchases. The EPA label is the law for any pesticide. These links match the sequence on this page — they are not a shopping list instead of identification. Details: advertising disclosure. Browse the full tools catalog.
Hardware
Victor M326 rat snap traps (2-pack)
Rats need a larger trap than mice. Set several along the actual runway, in boxes if pets or children use the room. Pre-bait unset for a night if they are shy.
Hardware
Catchmaster 48R rat-size glue boards (2-pack)
Rat-sized trays for floor runways where you want a catch without a snap trap. Place along walls. Keep out of reach of children and pets; vegetable oil releases the adhesive if something else sticks.
Hardware
Ultrasonic pest repeller (plug-in)
Plug-in sound units sold for rodents, cockroaches, and other indoor pests. Cover more than one room if that is how the house is laid out. Read the pack for pet and hearing notes.
Hardware
Door sweep / garage threshold seal
The gap under an alley or garage door feeds more rats than a bait station on the wrong wall. Measure the gap. A sweep is exclusion, not a gadget.
Hardware
Copper mesh for rodent gaps
Stuff quarter-sized and smaller holes after you know the runways. Steel wool rusts and gets pulled out. Mesh is not a substitute for a door sweep on a half-inch gap.
Species pages
Open the matching species article for identification features, legal notes, and the full control sequence.
Norway rat
Rattus norvegicus
The Norway rat is the heavy, ground-dwelling commensal rat of US cities. It does not “decide” to live in…
Roof rat
Rattus rattus
Roof rats are the athletes of commensal rats: long tail, large ears, a nose that looks sharp compared with a…
Common questions
Is one rat a sign of an infestation?
Usually yes. Commensal rats are social. A daylight sighting indoors is a strong signal that the colony is larger than the one animal you saw. Treat the runway and the hole, not the anecdote.
Can I get rid of rats without poison?
Yes. Sanitation, metal exclusion, and snap traps on runways are the indoor standard in this directory. Poison is a last resort for some outdoor pressure, in labeled stations, after food sources are cut. See the rodent trapping and rodent baiting method pages.
How long does it take to get rid of rats?
A small, well-mapped job can drop in days once traps are on the runway and holes are sealed. An established colony with a dumpster and a broken lateral takes weeks, plus building work. If you skip exclusion, rats return on the same commute.
Do rats come back after treatment?
They return if the food, water, and hole remain. Killing the current animals without sealing entry is a pause, not a finish. New rats use the same dumpster and the same ½-inch gap.
Are rats more common in winter?
Activity inside buildings often becomes obvious in cold months as rodents use heat and stored food. Urban Norway rats and Sun Belt roof rats are year-round pests. Proofing is easier before the first cold snap, not after you hear the ceiling.
Will a cat solve a rat problem?
A cat may catch a juvenile. An established colony with a grease dumpster is not a cat job. Exclusion and sanitation still decide the outcome.