Rodent guide
How to Get Rid of Rats
A full walk-through for a householder: proving it is rats, reading the runways, setting traps an animal will actually go near, what changed about bait in 2026, and the proofing that decides whether any of it holds.
Rats widen what is already open. This started as a worn strip of rubber under a door.
Working out how to get rid of a rat is mostly a test of patience, not of product. A rat is a large, careful animal with a fixed route through your property and a long memory for the things that were not there yesterday. Rush it and you teach it to stay away from the one thing you wanted it to touch.
What follows is the whole sequence a householder can carry out: proving the animal is a rat rather than a mouse, finding the road it uses every night, choosing and setting traps that get approached instead of avoided, understanding what changed about rat bait in 2026, and closing the building afterwards with materials that hold. It is one of Tim's pest control guides, written for people doing the work themselves.
Expect this to take two to three weeks rather than a weekend. That is not a failure of the method, it is the method. The pages that promise an overnight result are describing mice.
Name it first
Before you decide how to get rid of a rat, is it actually a rat?
Hole size settles it in a few seconds. Victorian health guidance puts a mouse hole at up to roughly 20 mm across and a rat hole at around 80 mm. Add the dropping length, the weight of the sound overhead and whether there are smears on the timber, and you have your answer before you spend a cent on gear.
It matters because every decision after this one changes. A rat needs a bigger trap with a stronger bar, placed in fewer spots and left alone for days. A mouse needs many small placements and gives you a result in a night or two. Buy the wrong gear and you will spend a fortnight proving nothing.
- Runway
- The fixed path a rat uses between its nest and its food, usually hard against a wall, a beam, a fence capping or a pipe. Rats repeat it so exactly that body oil and dust build into a visible dark smear along the surface.
The three species that matter in Victoria are the Norway rat, the roof rat and the house mouse. Height is the quickest separator between the two rats: anything in a ceiling, along the top of a wall or up a tree against the house is roof rat behaviour, while holes in soil beside the footings, under a shed floor or along a drain line belong to the Norway rat.
- Droppings the length of an olive pip, in a few heavy groups, say rat. Grain-of-rice pellets scattered everywhere say mouse.
- A sound with weight to it, moving slowly across a ceiling, says rat. Fast, light scratching inside a wall at head height says mouse.
- Dark greasy marks along a skirting, a joist or a pipe say rat, because a mouse rarely leaves enough oil to show.
- Chewed hard plastic, a damaged water line or a gnawed timber edge widened over weeks says rat.
One Melbourne seasonal note worth holding on to. The first complaints arrive as the nights cool through autumn and vacant blocks get slashed, which pushes animals off open ground and towards buildings. Heavy rain does the same thing faster by flooding burrows and drains, so a wet week in winter often produces a sudden run of calls.
Trapping
Which rat traps work, and how do you set them so they get used?
A heavy-duty snap trap, placed on a proven runway and left unset and baited for three or four nights before you arm it, outperforms anything else a householder can buy. The pre-baiting step is what people skip, and it is the step that decides the outcome, because a rat treats a new object in its own territory as a hazard for days.
Rats are wary of anything that appears in ground they know well. Biologists call it neophobia, and it is the single trait that separates a rat job from a mouse job. A trap dropped on a runway tonight may be walked around for the better part of a week. The same trap, sitting there baited and harmless for four nights first, often fires within an hour of being armed.
| Trap | How well it works | Worth buying? |
|---|---|---|
| Heavy snap trap | Kills on the strike when the animal is in position. Reusable, cheap, and you get the body back | Yes. This is the one to start with |
| Enclosed snap trap | Same mechanism inside a plastic shell, safer around dogs and children, slightly slower to be accepted | Yes, wherever pets or kids go |
| Electric trap | Quick and reliable when the batteries are fresh, but expensive once you need six of them | Only in small numbers indoors |
| Cage trap | Catches the animal alive, which leaves you with a problem rather than a result | Rarely. Rats released nearby come back |
| Bucket or drowning trap | Kills slowly by exhaustion, and the internet videos never show the last ten minutes | No |
| Glue board | Holds a conscious animal until someone finds it | No, and it is prohibited in this state |
- Read the routeFind the smears, droppings and chew damage, then put everything on that line rather than where it looks tidy.
- Leave them harmlessSet traps unarmed and baited for three or four nights so they stop being new. Wire them down so nothing drags one off.
- Arm them all at onceSix or eight together on the same night, not one at a time, so the whole group meets the same change.
- Check and keep goingClear catches daily, rebait, and carry on for a fortnight after the last one. Stopping early is why it restarts.
Bait choice is simpler than the forums suggest. Use whatever they are already eating on your property: dog biscuit, a smear of peanut butter pressed into the trigger, bacon rind, a dried fruit, birdseed if the aviary is the draw. Tie or wire the food to the trigger so the animal has to work at it rather than lifting it clean off.
Placement beats everything else. Traps go flat against a wall with the trigger end towards it, behind the fridge rather than in front of it, along the top plate in a roof space, beside a burrow mouth in a garden bed, under decking at the entry point. An open floor is wasted ground, because a rat crosses the middle of a room only when it has no choice.
A cheap way to prove where they walk: sift a light dusting of plain flour or talc across a suspected run, leave it overnight and look in the morning. Footprints and a tail drag through the powder tell you the route and the direction, which is far better evidence than a guess about which corner looks likely.
Bait and the law
What changed about rat bait in 2026, and what is safe to use now?
Second-generation rodenticide products have been suspended by the national regulator since 24 March 2026 over the risk to wildlife, so rodent work now leans on trapping, proofing and the products that remain registered. The suspension runs for a year from that date, and during it supply and use must follow the conditions published in the regulator's gazette.
There is a second part to the same decision. On 10 March 2026 the regulator certified that it is in the public interest for products containing these actives to be declared restricted chemical products, which would limit who can buy them. That certification still has to be accepted by the Commonwealth agriculture department, so it is a direction of travel rather than a rule already in force.
The actives caught by the suspension are brodifacoum, bromadiolone, difenacoum, difethialone and flocoumafen. First-generation anticoagulants were not part of it, and a wider review of the whole group of anticoagulant rodenticides has not closed.
- Read the box, not the shelf label. The active name is on the back in small print, and it is the only thing that tells you what you are holding.
- Loose blocks are never acceptable. Anything you use belongs inside a locked, anchored station that a dog cannot open or carry off.
- Write down every placement. Bait you cannot find later is bait you cannot collect when the job is finished.
- Collect the bodies. A poisoned rat left in the open becomes a dose for a cat, a kookaburra or a powerful owl.
The practical consequence for a householder is that the fast, strong products are no longer the easy purchase they were. That is not a loss. Trapping gives you a body count, a finish line and nothing left in the ceiling to smell, and the regulator's reasoning was precisely that too much of what was eaten upstream ended up in animals nobody was aiming at.
Think about where the animal will die before you put any bait out. A rat that feeds in your roof usually dies in your roof, and the odour from a body sealed in a cavity runs for one to several weeks in warm weather with nothing you can spray to shorten it. That single fact is why trapping carries so much of the work in occupied homes.
Shutting the door
Which gaps and which food sources keep sending them back?
A rat gets through an opening of about 20 mm and makes anything smaller bigger with its teeth, so the test is not whether the gap looks big enough, it is whether the material can be chewed. Press a thumbnail into it. If it dents, a rat will be through it, and that rules out foam, silicone, plastic and soft timber on their own.
The materials that hold are dull and cheap: galvanised or stainless mesh, sheet metal plates over chewed edges, mortar at a brick opening, vented covers made for weep holes, and a new brush strip under a door. Foam still has a role, holding mesh in position and stopping draughts, but it is never the thing doing the work.
Sequence is the part people get backwards. Closing everything while the animals are still inside leaves them shut in with you, chewing a fresh way out somewhere less convenient or dying where nobody can reach them. Knock the numbers down first, keep one busy route open and under watch, then shut it once the traps have gone quiet for several nights running.
- Branches and climbers that come within half a metre of a gutter are a bridge over everything you did at ground level.
- Chook pens are the strongest draw in any backyard: grain, water, warmth and cover together. Feed in a metal bin, feeders up at dusk.
- Fallen fruit under a lemon, fig or olive is collected nightly. Clearing it weekly while the tree is dropping takes a real meal off the property.
- Dog droppings and open compost both feed a Norway rat. Picking up daily and lidding the bin removes two meals most people never count.
Older Melbourne suburbs add one source you cannot see. Clay house drains with mortar joints crack with age and root pressure, and a broken section or a disused stub gives a sheltered road from the sewer to the ground under a slab. The giveaway is activity that returns every few months in the same spot with nothing visible above ground, and the fix is a plumber with a camera rather than more bait.
The limit
When does do-it-yourself rat control stop being worth it?
When three weeks of pre-baited, properly placed traps has not reduced the signs, when the activity is in a roof void or subfloor you cannot safely enter, or when the source is next door and keeps refilling whatever you catch. None of those are fixed by buying a different trap, and a breeding population will outrun a slow approach.
Nothing is changing
Traps untouched after three weeks usually means the placements are off the runway, something better is still on offer, or the animals are entering from outside your boundary.
You cannot get to them
A roof void with no hatch, a subfloor you crawl on your stomach, a cavity above a bedroom. Those spaces need gear, a respirator and someone insured to be up there.
It keeps coming back
Quiet for a month and then it starts again. That pattern points at a drain, a neighbouring property or an opening nobody has found yet, not at the trapping.
What a professional adds is access and sequence rather than a secret product. The roof void and the subfloor get entered and read, placements go where the evidence says rather than where you can reach, every opening is written down, and the sealing happens in the right order at the end. Tim attends every job himself, so the person who finds the gap is the person who comes back to check it.
His Victorian pest control licence is No. 86488, a number listed on the public register for anyone who wants to look before they book, and he is fully insured. Treatments he covers carry a guarantee of three months, so a return of the same pest to ground he has already treated inside that period brings him back for nothing. Melbourne and the surrounding suburbs are his patch.
The page on rat control in Melbourne sets out how a visit runs, what the roof void and subfloor work involves and what moves the price, or you can send the details through with a photo of the droppings beside a coin. If the noise is overhead rather than at ground level, start with the guide on rats in a roof space, and if you are still not certain what you are dealing with, the rodent nest signs walk-through goes through the evidence one sign at a time.
Questions
Rat questions people ask before they call anyone
What is the best rat trap?
A heavy snap trap, wired down on a runway and left unset and baited for three or four nights first. Enclosed versions of the same thing are the pick where dogs or children go. The trap matters far less than the placement and the pre-baiting, which is where most attempts fall over.
Is rat poison safe to use at home?
It carries real risk and the rules tightened in 2026. The strongest anticoagulants are under a national suspension, and anything you do use has to sit inside a locked station a pet cannot open, with every placement recorded and the bodies collected. In an occupied house, trapping is the easier call.
Where are the rats coming from?
Usually an opening of about 20 mm or wider that already existed: a worn garage door strip, an uncovered weep hole, a gap at a pipe, a missing eave board or a lifted tile. The climbing species also comes in over a branch or an overhead cable, while the burrowing one arrives up a broken drain.
How long should trapping take?
Two to three weeks for a normal household problem, with the first four nights spent letting the traps become part of the furniture. Keep going for a fortnight past the last catch. A result that arrives on night one usually means mice rather than rats.
Do I need to wear gloves when setting traps?
Wear them for hygiene rather than scent. Rats are not put off by human smell the way the old advice claims, but droppings, urine and carcasses are worth handling properly. Gloves on, dampen any mess before you clear it, bag it, and wash your hands afterwards.
Can I just block the hole and be done with it?
Not while anything is still inside. Sealing an active building traps animals in cavities where they chew a new exit or die out of reach. Reduce the numbers first, keep one route open and watched, then close it last. Done in that order, proofing is what makes the result stick.
Traps untouched after a week?
Describe the noise, the droppings and your suburb, and Tim will tell you which species it reads as and what the job involves before any price is agreed.
Reviewed October 2026 by Tim, licensed pest control operator (Victorian licence No. 86488). Rodenticide suspension and restricted chemical product certification: APVMA. Rodent identification and hole sizes: Victorian Department of Health. Using a pest control service: Better Health Channel.