Key Takeaways
- The most common signs of rodents are droppings, gnaw marks, scratching noises at night, greasy rub marks and a musty smell.
- Rats and mice leave different clues. Droppings size is the easiest way to tell them apart.
- Rodents contaminate food, chew wiring and insulation, and can spread disease.
- Traps and bait can help, but they will not stop rodents getting in. Sealing entry points matters just as much.
- If you see signs, a licensed technician can find the entry points and treat the problem.
Common Signs of a Rodent Infestation
Rodents are shy and mostly active at night, so you often notice the evidence before you see the animal. Check kitchens, pantries, the roof void, the garage and the areas behind appliances. Our rodent control team looks for the signs below during every inspection.
| Sign | What to look for | Where to check |
|---|---|---|
| Droppings | Dark pellets, fresh ones soft and shiny | Pantry shelves, cupboards, roof void, along walls |
| Gnaw marks | Chewed packaging, timber, wiring or pipes | Kitchen, laundry, garage, under the house |
| Noises | Scratching, scurrying or squeaking at night | Ceilings, walls and wall cavities |
| Grease marks | Dark smears along skirting and walls | Regular travel routes |
| Nests | Shredded paper, fabric or insulation | Roof voids, boxes, behind appliances |
| Smell | A musty, ammonia-like odour | Enclosed spaces and storage areas |
| Pet behaviour | Dogs or cats sniffing, scratching or staring at one spot | Walls, cupboards and floor edges |
Fresh droppings are soft and dark, while old ones are dry and crumbly. That difference tells you whether the activity is current or from some time ago.
Rats or Mice? How to Tell
The two need slightly different treatment, so it helps to know which one you have. Droppings and noise are the quickest clues. Our guide to rodents in Australia covers the species in more detail.
| Clue | Mice | Rats |
|---|---|---|
| Droppings | About 3 to 6 mm, like grains of rice | About 12 to 20 mm, larger and thicker |
| Entry gap | Can squeeze through gaps of about 6 mm | Need gaps of about 12 mm or more |
| Sounds | Light scratching and squeaks | Heavier thumping and running in the roof |
| Typical spot | Pantries, cupboards and wall cavities | Roof voids, gardens and under decks |
Which Rodents Live in Australian Homes?
Three introduced species cause most household problems. Each prefers a different part of the property.
- Black rat (roof rat): an agile climber that nests in roof voids and trees.
- Norway rat: a burrower that prefers ground level, drains, garden sheds and under decks.
- House mouse: small and adaptable, often living in wall cavities, cupboards and pantries.
Why Rodents Come Into Homes
Rodents are looking for three things: food, water and shelter. The Gold Coast’s mild climate means they stay active through much of the year, and homes near bushland, canals or dense gardens often see more activity.
- Pet food, rubbish bins and fallen fruit.
- Gaps around pipes, vents, doors and the roofline.
- Overhanging branches that give access to the roof.
- Clutter in garages, sheds and under the house.
- Leaking taps and standing water.
Why Rodents Are More Than a Nuisance
Rodents cause damage and health risks that grow the longer they stay. They breed quickly, so a few can become a large population in a short time.
- They contaminate food and surfaces with droppings and urine.
- They can spread bacteria such as salmonella and leptospirosis.
- Chewed wiring is a fire risk.
- They tear up insulation to build nests.
- Fleas and mites can travel with them into the home.
Rodents also keep gnawing because their teeth never stop growing. That is why you find chewed timber, pipes and cables, even where there is nothing to eat. Early action protects the home and your family.
What to Do If You See Signs
Act quickly, because rodent numbers rise fast. These steps help while you arrange treatment.
- Wear gloves and a mask when cleaning droppings, and disinfect the area afterwards.
- Put food in sealed containers and clear pet food away overnight.
- Seal obvious gaps with steel wool or metal mesh.
- Fix leaks and remove stored clutter.
- Book a professional inspection to locate the entry points and the nest.
Why DIY Traps Often Fall Short
Traps and bait catch some rodents, but they do not stop more from coming in. If the entry points stay open, new rodents replace the ones you remove. Poorly placed bait can also be eaten by pets or wildlife, and a rodent that dies inside a wall cavity can cause a strong smell.
A technician places bait and traps where they work, follows the activity and shows you what to seal.
Rodent Treatment on the Gold Coast
Rodent treatment is available as an add-on to our general pest control. A technician inspects the home, the roof void and the yard, finds where rodents are getting in and sets up a treatment plan to match. Our treatments are suitable for children and pets, and we explain exactly what is placed and where.
Follow-up matters as much as the first visit. Rodent activity can continue for a short time after treatment, so your technician will explain what to expect and what to report if you notice new signs.
How to Keep Rodents Out
- Seal gaps larger than 5 mm around pipes, vents, doors and the roofline.
- Store pantry food in sealed containers.
- Use bins with tight lids and take them out regularly.
- Trim trees and shrubs back from the roof and walls.
- Keep firewood, timber and clutter off the ground and away from the house.
Hear Scratching in the Roof? Call Us
Control Pest Management technicians are licensed, fully insured and police checked. We service the Gold Coast, Brisbane, Gladstone and Logan. See our Gold Coast pest control page, then request a free quote or call 1300 357 246.
Frequently Asked Questions
What are the first signs of a rodent infestation?
The earliest signs are usually droppings, scratching or scurrying noises at night, and gnawed food packaging. You may also see greasy rub marks along walls or notice a musty smell in a cupboard or the roof void. Check these spots first.
How can I tell if I have rats or mice?
Look at the droppings. Mouse droppings are about 3 to 6 mm and look like grains of rice, while rat droppings are 12 to 20 mm. Heavy thumping in the roof usually means rats, and light scratching in walls suggests mice.
Are rodents dangerous?
Yes. Rodents contaminate food and surfaces and can spread bacteria such as salmonella and leptospirosis. They also chew electrical wiring, which raises the fire risk, and they damage insulation. Clean droppings with gloves and a mask, and call a professional to deal with the cause.
Why do I hear noises in the roof at night?
Rodents are most active at night, and roof voids give them shelter and access to wiring and insulation. Possums can also make noise in the roof. A technician can identify what is there, because the treatment for each is different.
How do I stop rodents coming back?
Seal entry gaps, store food in sealed containers, clear clutter and keep bins and pet food secure. Trim branches away from the roof. If activity continues, a technician can find hidden entry points, treat the problem and set up ongoing monitoring.