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Rodent control is sealing, not spraying

Mice and rats keep coming back until the hole is closed. What a real rodent job includes, why the exclusion list matters more than the trapping, and how to quote it properly.

In short

What is rodent control?

Professional rodent control has three parts, and only one of them is trapping. A technician finds and seals the entry points, removes the animals already inside, and cleans up contaminated insulation and droppings where needed. Sealing is the part that decides whether the problem returns, which is why a rodent quote should come with a written list of the gaps found and what will be used to close each one. Mice and rats behave differently enough that identifying which you have changes the whole plan.

Triggers

Signs you need rodent control

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The job

How rodent control actually works

  1. Identify which rodent, because the plan changes

    House mice squeeze through very small gaps, nest close to food, and range only a short distance from it — so interior work matters. Rats are stronger, travel further, more often enter low from burrows, sewers or the crawl space, and are notoriously wary of new objects in a familiar route.

    Watch for: A plan that does not distinguish. Rat neophobia in particular means devices set today may be avoided for days — a technician who expects instant catches with rats does not work with them often.

  2. A full entry-point survey, inside and out

    Roofline and soffit junctions, gable and dryer vents, the garage door corners, weep holes, utility and pipe penetrations, the sill plate, foundation cracks, and where a deck or an addition meets the original structure. Rats add sewer lines, burrows and low grade-level openings to that list.

    Watch for: A survey that produces no written list. If nobody can tell you where the holes are, nobody has found them, and everything after this step is temporary.

  3. Exclusion — the actual repair work

    Gaps get closed with materials rodents cannot chew through — metal mesh, sheet metal, hardware cloth, mortar — rather than foam alone. Vents get screened, door sweeps get replaced, roof junctions get flashed.

    Watch for: Expanding foam used on its own as a seal. It stops draughts and does not stop a rodent. Ask specifically what material closes each opening.

  4. Trapping the population inside

    Traps are set on the runways evidence identified, against walls and in the attic, then checked and reset over repeat visits until activity stops. This takes more than one appointment and should be quoted that way.

    Watch for: A single visit with devices left behind and no return scheduled. Trapping is a monitored process; unattended traps are a dead animal you will find by smell.

  5. The rodenticide decision, made deliberately

    Bait is used in tamper-resistant stations, usually on the exterior. It has genuine drawbacks: an animal that eats bait can die inside a wall cavity where it cannot be retrieved, and predators or pets that consume a poisoned rodent are exposed in turn.

    Watch for: Interior baiting proposed as the default in a home with pets or small children. Ask why bait rather than traps, and ask for the product label and safety data sheet for anything placed on your property.

  6. Clean-up and restoration

    Heavily contaminated insulation is removed and replaced, and droppings and nesting material are cleared. This is often quoted separately and can be the largest line on an attic job.

    Watch for: Rodent droppings and nesting material carry real health risks and should not be swept or vacuumed dry. Follow current public-health guidance on cleaning them, or have it done.

Money

What does rodent control cost?

A rodent job prices in two parts: the trapping and removal service, and the exclusion repairs, which are the larger and more variable piece. Attic clean-out and insulation replacement is a third line again. See the Cost Guide for what drives the range on each.

See the full rodent control cost guide — by material, size and region →

Straight answer

When rodent control is the wrong call

Everyone else ranking for this is paid when you say yes. Here's when you shouldn't.

Your options

Types of rodent control

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Before you sign

What to check when hiring for rodent control

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Local pros

Rodent Control near you

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Related work

Often done at the same time

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FAQ

Rodent Control — questions people ask

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Dropping size is the quickest tell — mouse droppings are small and rice-grained, rat droppings are noticeably larger. Location helps too: mice nest close to a food source and often show up inside cabinets and behind appliances, while rats more often work the attic, the crawl space and the exterior perimeter and travel considerably further. Gnaw damage from rats is coarser. If you are unsure, photograph the droppings rather than clearing them.
Because you almost never have one. Catching two or three animals in a house with an open entry point tells you the route works, not that the population is gone. Activity should be monitored to zero over repeat visits, and the entry points sealed — in that order for mice, and with careful timing for larger animals so nothing is sealed inside.
It is a real trade-off rather than a yes or no. Professional use is in tamper-resistant stations and the label directions are legally binding on the applicator. The two consequences to weigh are that a poisoned rodent may die inside a wall or ceiling void where it cannot be removed, and that a pet, a bird of prey or another predator eating a poisoned rodent is exposed in turn. Where children, pets or wildlife are a concern, ask for a trapping-led plan and get the label and safety data sheet for anything used.
Some of it, and it is worth doing: door sweeps, vent screens, sealing accessible penetrations with steel wool or hardware cloth and mortar, moving the woodpile off the wall and the bird feeder away from the house. What is harder for a homeowner is the roofline, the soffit junctions and anything requiring ladder work or crawl space entry — and those are where the openings that matter most often are.

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