Things That Go Bump In The Night: Sydney’s Nocturnal Pests

What Is Making Scratching Or Thumping Noises In My Sydney Roof?

Sydney homes can experience a range of night-time pests, particularly in warm urban environments where food, moisture and shelter are available. Rodents, cockroaches and other pests often remain hidden during daylight hours and emerge after dark, making nighttime sounds and sightings important warning signs of possible infestations

If you hear strange bumps above your ceiling, you are not alone. From my own experience at my Western Sydney home: I heard loud thumps and scratches above my office for 3 days before I said anything. I grabbed a broom and banged the ceiling—things went quiet for 10 minutes, then started again. I moved my desk away from the wall vent because I feared a rat would chew through. When our technician inspected, he found only a pair of noisy mynas building a nest. I couldn’t believe how much racket two small birds made.

CSIRO 2025 data shows 1 in 4 Sydney homes reports roof pest activity each year, with rodents making up 42% of cases, birds 35% and possums 23%. Source: CSIRO Australian Pest Animal Survey 2025.

For a full roof inspection tailored to your Sydney home, contact Sydney’s Best Pest Control.

How Do I Tell Which Pest Is In My Roof By The Noise It Makes?

The single easiest way to narrow down the culprit is to note exactly when you hear activity. Each pest follows a predictable daily rhythm, and matching the time to the sound cuts your diagnosis time in half. First, listen for 2–3 nights in a row and jot down what you hear and when.

Early morning noises (5am–8am)

If you hear chirps, flutters and soft rustles as the sun comes up, you almost certainly have birds. Common Sydney culprits include mynas, starlings and sparrows, who squeeze under loose tiles or through broken eaves to build nests. Go outside at first light and watch your roof line—you will likely see small birds flying in and out of a single entry point.

South Australian Health Department data shows bird lice infestations affect 1 in 7 Sydney homes with active roof nests, triggering itchy bites that often get misdiagnosed as bed bugs for 2–3 weeks. Source: SA Health – Bird Lice And Mites.

Sunrise/sunset noises (6am–7am and 5pm–8pm)

Loud thumps, slow scurries, hisses or deep growls at dawn and dusk almost always mean possums. Ringtail and brushtail possums are nocturnal, so they wake up as the sun sets to leave the roof for food, then return just before sunrise. On top of that, you may smell strong urine stains near ceiling vents or see scratch marks on wooden fascia boards.

NSW National Parks and Wildlife Service (NPWS) data confirms 92% of urban possum intrusions in Sydney occur between March and October, when native trees drop fruit and nesting sites grow scarce. Source: NSW Environment – Possums In Your Home.

Most importantly, it is illegal to kill or harm possums in NSW—they are protected native fauna under the National Parks and Wildlife Act 1974. You must use a licensed technician to trap and release them within 50 metres of your home, or install one-way exit doors so they leave and cannot return.

All-night noises (9pm–5am)

Fast, constant scratching, gnawing or tiny scampers that run from one end of the roof to the other all night long point straight to roof rats. Unlike possums, rats do not pause for long—they move constantly to build nests, store food and gnaw on hard surfaces to wear down their ever-growing teeth. Worse still, you will rarely see a live rat; they hide in wall cavities and only come out when no one is around.

NSW Fair Trading 2024 reports rodent-chewed wiring causes 8% of all residential electrical fires in Sydney each year, with an average repair cost of $12,800 per affected home. Source: NSW Fair Trading – Home Electrical Safety.

Pest Type	Noise Timing	Typical Sounds	Key Signs	NSW Legal Status	Top Risk
Birds (mynas, starlings)	5am–8am daily	Chirps, flutters, soft rustles	Nesting material, bird droppings on eaves	Unprotected; nests can be removed by licensed technicians	Bird lice bites, fungal spores from droppings
Possums (ringtail, brushtail)	Sunrise + sunset	Heavy thumps, hisses, growls, slow scurries	Strong urine smell, large droppings, scratch marks on fascia	Fully protected; cannot be killed or relocated >50m	Roof damage, urine stains, disease transmission
Roof rats	9pm–5am, all night long	Fast scratches, gnawing, tiny constant scampers	Small dark droppings, chewed wiring, grease marks on walls	Unprotected; targeted baiting allowed by licensed technicians	Electrical fires, salmonella, leptospirosis

What Risks Do Roof Pests Pose To My Sydney Home And Family?

Noises are only the first sign of trouble. Left untreated, every common roof pest causes costly, sometimes dangerous damage to Sydney homes. The type of risk changes by pest, but none of them get better on their own—they only multiply as the weeks go on.

Bird and bird lice risks

Old bird nests left in roof voids hold thousands of dormant bird lice. When the chicks fledge and leave, the lice crawl down through wall vents and light fittings looking for new blood meals. Bites show up as small red itchy spots, usually around your neck, shoulders and waist—exactly where your clothes sit loose against your skin. As a result, many Sydney families spend hundreds on bed bug treatments before someone correctly identifies bird lice as the cause.

Possum risks and legal rules

Possums weigh 1–4kg, so their nightly movements damage ceiling plaster and loosen roof tiles over time. Their urine soaks into insulation and ceiling batts, creating a permanent smell that draws more possums back year after year. In contrast to popular belief, you cannot trap a possum and drive it to a park 10km away—that is illegal in NSW, and the possum will almost certainly die from stress or predation. Only licensed technicians can legally install one-way doors or humane traps.

Take our 2024 job in Lindfield (North Shore): A homeowner heard heavy thumps and hisses every sunset for 2 weeks. She feared a large rat infestation and replaced all her pantry food twice. Our technician found two brushtail possums using a loose roof tile as an entry point. We installed a one-way exit door, sealed all gaps, and the possums left on their own within 3 days—no traps needed, and no recurrence in 14 months.

Rodent health and fire risks

Roof rats leave 30–50 droppings every single day, which dry out and release spores that trigger asthma attacks in children and elderly residents. They also carry leptospirosis, salmonella and rat-bite fever, all of which require hospital treatment in severe cases. Most dangerously, their front teeth grow 12cm every year, so they gnaw constantly on electrical cables, plastic water pipes and even wooden roof beams to keep them short.

One long-term Inner West client put it perfectly: “I have used many pest control companies and ALL of them had to return to correct their work. Until I met Pest Control Sydney. Leanne is super magnificent, delivers what is promised and her team are polite, confident and get the job done.”

If you spot rodent droppings or hear all-night scratching, call our EPA-licensed Sydney team immediately on 1800 819 189 to stop wiring damage before it starts.

What Should I Do First If I Hear Noises In My Sydney Roof?

Follow these 5 simple steps before you pick up the phone. They help our team diagnose the problem faster and bring the right equipment on the first visit, so we can resolve your issue in a single trip.

1. Record activity for 3 nights: Write down the exact time you hear noises, what they sound like, and which room they are loudest in.
2. Check the exterior at dawn/dusk: Walk around your home and look for loose tiles, broken eaves, gaps around pipes or overhanging tree branches that touch the roof.
3. Inspect safely for physical signs: If you can access your manhole safely with a torch, look for droppings, nesting material, urine stains or chewed cables. Never go alone, and never touch droppings with bare hands.
4. Match your findings to the comparison table: This will tell you if you are dealing with birds, possums or rats before we arrive.
5. Do not attempt DIY removal: Store-bought rat poisons harm native animals, possum traps set without a licence break NSW law, and climbing on tiled roofs causes more damage than the pests themselves.

Frequently Asked Questions

Can I remove a possum from my Sydney roof myself?

No. Possums are protected under the NSW National Parks and Wildlife Act 1974. It is illegal to trap, harm, kill or relocate a possum more than 50 metres from your home without a licence. Licensed technicians use one-way exit doors or approved humane traps to resolve intrusions legally and safely.

How much does roof pest removal cost in Sydney in 2026?

Bird nest removal starts at $180–$250, possum exclusion with entry sealing costs $350–$550, and full rodent baiting programs run $220–$380. Prices change based on home size, number of entry points and how long the infestation has been active. All our quotes are free with no obligation.

Do bird nests in Sydney roofs carry diseases?

Yes. Old nests hold bird lice, mites, fungal spores and bacteria that can trigger asthma, skin infections and respiratory illness. Even after the birds leave, the nest remains a health risk until a technician removes it and treats the area with a safe residual spray.

How do I stop pests getting back into my roof void?

Seal all gaps larger than 5mm with metal mesh or weatherproof sealant, trim overhanging tree branches back 1 metre from the roof line, fix loose tiles and broken eaves immediately, and keep compost bins and pet food bowls sealed or stored indoors at night.