Rat and Mouse Control: How to Get Rid of Rodents for Good

What does rodent control cost?

Five signs that confirm you have rats or mice

Before you call anyone, it helps to know what you're dealing with. Pest controllers use five signs to confirm a rodent problem and tell rats from mice. You can check for all five yourself. 2health.vic.gov.auView source

Possums move around in ceilings and walls at night too. The difference matters. Possums are protected native animals. They can't be trapped or harmed. The five signs below will help you rule them out fast.

Gnaw marks and holes tell you which species you're dealing with

Rats and mice chew different-sized holes. A mouse hole runs up to about 20mm across. A rat hole is roughly 80mm. 2health.vic.gov.auView source Measure it. That single number tells a pest controller whether they're setting up for mice or rats, and they'll treat them differently.

Fresh gnaw marks are pale and light-coloured. Older marks turn dark. If you're seeing pale marks on skirting boards, cables, or food packaging, the infestation is active right now, not historical.

Droppings, rub marks, and sounds tell you where they're nesting

Rodents travel the same paths every night. They leave two clear traces: droppings along the route and greasy smear marks where their fur touches walls and skirting boards at ground level. 2health.vic.gov.auView source Follow the marks. They'll lead you to where the rodents are spending their time.

Scratching or scurrying sounds in the ceiling or walls peak just after dark and again just before dawn. 2health.vic.gov.auView source Rats make heavier, slower sounds. Mice are faster and higher-pitched. Both are distinct from the slower, dull thud of a possum crossing a roof.

Nests are compact balls of shredded paper, cardboard, fabric, or insulation, tucked into a corner of a roof void, subfloor, or wall cavity. 2health.vic.gov.auView source Finding a nest during an inspection means you've got an established population, not a single stray animal.

Rodent health risks are real but rare: here's what actually matters

Rodents can make you sick. NSW Health lists four diseases that rodents carry in Australia: leptospirosis, rat bite fever, salmonellosis, and other gut infections. 4health.nsw.gov.auView source 5betterhealth.vic.gov.auView source NSW Health and Victorian health authorities both confirm these risks. Leptospirosis is the most serious of the four.

The good news: infections are rare. 4health.nsw.gov.auView source To get sick you need contact with rodent urine, contaminated surfaces, or a bite, not just sharing a building with one. The steps are simple. Treat the problem quickly. Use a pest controller to clean up contaminated areas. Wash your hands after handling nesting material. Don't leave food out.

For most homes, the bigger risk is property damage. Rodents chew through cables, insulation, and timber. A chewed cable inside a wall is both a fire risk and an expensive fix. Waiting to see if it sorts itself out isn't a good plan.

Leptospirosis is the most serious risk, but it's concentrated in specific regions

Of the diseases rodents carry, leptospirosis causes the worst illness when cases do escalate. It can lead to kidney failure, liver damage, or meningitis. 5betterhealth.vic.gov.auView source The risk is highest in north-eastern NSW and Queensland, especially in high-rainfall areas. If you live there and you've spent time clearing out a rodent-affected space, mention it to a GP.

For most city homes, the risk is low. The bacteria enter through cuts or mucous membranes. Wear gloves when clearing out an infested roof void and wash your hands when you're done.

What a licensed pest controller does that hardware-store products can't match

A professional rodent job works in three phases: inspect, treat, and proof. Hardware-store products skip the first and third. 2health.vic.gov.auView source 3betterhealth.vic.gov.auView source

The inspection is what makes everything else work. A pest controller maps where rodents are active, where they're nesting, what they're eating, and how they're getting in. 2health.vic.gov.auView source That gives them the full picture. It tells them what product to use, where to put it, and what gaps need sealing. A homeowner who buys a bait block and hides it behind the fridge is working blind.

Treatment means bait stations placed at spots that are easy to reach and check. They're monitored and removed once the problem stops. 2health.vic.gov.auView source Snap traps or multi-catch devices are used when baiting isn't practical. They're more labour-intensive per rodent, so they're used less often.

The third phase is proofing: finding every gap a rodent uses and closing it. That takes a trained eye. For a full look at long-term exclusion work, see the pest proofing and prevention guide.

The March 2026 bait rules: the strongest rat baits are now licensed-only

From 24 March 2026, the APVMA suspended all second-generation anticoagulant rodenticide (SGAR) products. 1apvma.gov.auView source 6apvma.gov.auView source SGARs include brodifacoum, bromadiolone, difethialone, difenacoum, and flocoumafen. These were the most widely used professional rat baits. They're now restricted to operators who hold specific training and licences.

Why were they restricted? Secondary poisoning of wildlife. The APVMA review found that SGAR use poses unacceptable risks to animals that eat poisoned rodents. 6apvma.gov.auView source A rat that's eaten a lethal dose can take five to ten days to die. Its body holds high poison levels throughout that whole time. 1apvma.gov.auView source Any Barn owl, Nankeen Kestrel, or family cat that eats that rat gets a dose too.

First-generation baits (FGARs) aren't suspended. Products with warfarin, coumatetralyl, or diphacinone break down in rodent tissue faster, so the risk to wildlife is much lower. 6apvma.gov.auView source A licensed pest controller will pick the right product for your job. If a hardware-store bait contains brodifacoum or bromadiolone, its legal status may have changed since March 2026.

What to do if your pet or a native animal eats a baited rodent

If you think a cat, dog, or native animal has eaten a baited rodent, call a vet straight away. Don't wait for symptoms. These baits work slowly. Signs can take several days to appear, and early treatment works far better than late. For humans, the national Poisons Information Centre is 13 11 26. 3betterhealth.vic.gov.auView source

This is why bait placement matters. A pest controller puts stations where rodents go and pets can't easily reach. They keep a record of where everything is placed. 2health.vic.gov.auView source A loose bait block in a backyard is a very different risk. If a pest controller asks where your pets spend time, that's why.

The broader question of when to handle a pest problem yourself and when to call someone in is covered in the DIY vs professional pest control guide.

Baiting removes the rodents you have; proofing keeps the next lot out

The most common reason a rodent job gets repeated: the first treatment was baiting only. The bait works. The rodents die. Then a new group finds the same gaps in the walls, moves in, and you're back to where you started within weeks. 2health.vic.gov.auView source 3betterhealth.vic.gov.auView source

Mice can fit through a gap as small as 8mm. 2health.vic.gov.auView source Rats need more room, but older Australian homes rarely run short of it. Gaps where pipes come through walls, rusted weep holes, missing subfloor vents, cracks in the foundation: a pest controller doing an exclusion check maps all of these.

Six things you can do right now to reduce what's drawing rodents in, with no chemicals: take in pet food bowls at night, pick up fallen fruit, store birdseed in a sealed container, keep bin lids shut, move wood and rubbish piles away from the building, and trim plants back from the walls. 3betterhealth.vic.gov.auView source None of that fixes an active infestation, but it cuts the pressure on any treatment and slows re-infestation after.

The detail on how a pest controller seals a property for the long term is in the pest proofing and prevention guide below.

What rodent control costs and what scope each price covers

Rodent control in Australia varies a lot in price, and scope is almost always the reason. The live widget above pulls current estimates from real jobs. Here's what drives the cost.

A simple job on a single-story home with a contained infestation covers inspection, baiting or trapping, and bait station follow-ups. That's the low end of the range.

Adding entry sealing lifts the cost. The materials aren't expensive. The labour for a full exclusion pass across a property with many entry points is.

At the high end: cavity or contaminated ceiling work. Roof voids and subfloors with active infestations need more protective gear, careful removal of nesting material and droppings, and much more time on site. If a pest controller's quote is higher than you expected, ask them to explain what they found. The scope almost always explains the number.

For a full breakdown by job type, see the rodent control cost guide.

Licences your pest controller must hold for rodent work

Using pesticides for a fee requires a licence in every Australian state and territory. In NSW, that's a Pest Management Technician (PMT) licence issued by the NSW EPA under the Pesticides Act 1999. 7ablis.business.gov.auView source 8epa.nsw.gov.auView source It covers rodent baiting and general pesticide use. Fumigation is a separate licence, and in NSW it explicitly covers the control of mice and rats.

There's no single national framework. Each state runs its own scheme with its own licensing body. 7ablis.business.gov.auView source In Victoria, licensed pest controllers must hold a licence to use pesticides for rodent control. 2health.vic.gov.auView source Before a pest controller treats your property, you can ask to see their licence number.

This matters beyond basic compliance. Since March 2026, the pest controllers who can legally access SGAR products are precisely those who hold the right training and licences. 1apvma.gov.auView source That's how the restriction is designed. The people trained to use these products safely are the ones who can still get them.

Baiting only vs baiting with proofing: what you get

The difference in outcome between these two approaches is significant. Both cost money upfront. Only one tends to last. 2health.vic.gov.auView source 3betterhealth.vic.gov.auView source

The homeowner who heard scratching in the ceiling last night doesn't need to become an expert in rodenticide chemistry. They need to know two things. First: the five signs in this guide will confirm what they're dealing with in under five minutes. Second: a licensed pest controller gets you access to a complete job, the right bait placed correctly, followed by the exclusion work that stops the problem coming back.

That second part is what the bait rules changed in March 2026. The strongest rat treatments are now in the hands of people trained to use them. For serious rat infestations, calling a licensed pest controller is the most effective treatment path available.

Ask your pest controller about entry sealing as part of the scope. That single question is the one that separates a one-off treatment from a lasting result.