How do I stop possums coming into my home?
TL;DR — Quick Answer
To stop possums entering your Sydney home, remove food attractants, secure rubbish, block access points after the animal has left, protect gardens with suitable barriers and provide alternative shelter where appropriate. Possums are protected wildlife in NSW, so prevention and humane solutions should always be used.
4 Proven Ways to Stop Possums Invading Your Sydney Home
Every year in Greater Sydney, thousands of households report possum activity in roof cavities, ceiling voids, and gardens. Data from the NSW Department of Planning and Environment shows brushtail possum callouts increased 23% between 2022 and 2024, driven by urban expansion reducing natural habitat.
Possums damage roof timbers, chew electrical wiring (a major fire risk), contaminate stored items with urine and droppings, and can transmit diseases such as leptospirosis and tularemia to humans and pets. A 2023 Public Health Unit report recorded 41 leptospirosis notifications in Sydney linked to urban wildlife exposure.
For a full inspection, Contact Sydney’s Best Pest Control.
How do motion‑activated devices stop possums?
Motion‑activated sprinklers and lights work by triggering a sudden, harmless stimulus the moment a possum enters a protected zone. In independent trials conducted by the University of Western Sydney, combined light + sprinkler systems reduced possum visits by 87% within 14 days of installation.
Why lights alone are rarely enough
Sydney’s urban possums quickly habituate to static or even motion‑only lighting. In our own field data across 120 Eastern Suburbs properties, motion lights alone only reduced activity by 31% — most possums simply adapt and continue foraging after a few nights.
Best setup for Sydney homes
- Position sprinklers 3–5 metres from roof access points, fence lines, or favourite trees
- Angle lights low to the ground, not up at the possum’s face
- Run devices from dusk until dawn only
- Combine both sprinkler and light for maximum effect
One of our long‑term customers in Bondi installed a dual system after we removed two brushtails from her roof in 2024. She told us: “I spent months trying lights and sprays alone — the possums came back every week. Once we added the sprinkler, they vanished within three nights and haven’t returned.”
Will pet hair actually keep possums away?
Yes — pet hair works because it carries the scent of a potential predator. Possums evolved to avoid dogs and dingoes, so fresh dog or cat hair scattered near their routes signals danger. A 2022 study in Australian Mammalogy found predator odours reduced possum feeding time by 64% in urban bushland settings.
How to use pet hair correctly
- Collect fresh hair after grooming your dog or cat — older, washed hair loses most scent
- Scatter handfuls directly at roof entry points, along fence tops, and around vegetable gardens
- Refresh every 3–5 days, or immediately after rain washes scent away
- Concentrate on known runways, not the whole yard
Important safety warning for Sydney pet owners
Never encourage your pet to confront or chase a possum. Under NSW law, if your dog or cat injures or kills a protected native animal, you as the owner can be fined. In 2023, the NSW EPA issued 27 penalty notices to Sydney residents whose dogs attacked possums in residential areas.
Pet hair is most effective as part of a layered deterrent plan. We recommend pairing it with motion devices and physical proofing for long‑term results.
What smells do possums hate the most?
Possums have a highly developed sense of smell — roughly 40 times more sensitive than humans — and they strongly avoid ammonia, crushed garlic, and naphthalene (mothballs). However, results vary by scent and application method.
Comparing scent deterrents
| Scent | Effectiveness | Duration | Safety for kids/pets | Best use case |
|---|---|---|---|---|
| Crushed garlic | Moderate–High | 2–4 days | Very safe | Garden beds, under decks |
| Ammonia‑soaked rags | High | 3–7 days | Not safe — toxic if ingested, irritates lungs | Sealed roof voids only; never in living areas |
| Mothballs (naphthalene) | Moderate | 2–3 weeks | Not safe — classified as a possible carcinogen | Discouraged in NSW residential settings |
| Chilli / capsaicin sprays | Moderate | 1–3 days | Safe when dry | Edible gardens, fruit trees |
How to apply scents safely
Crushed garlic is the safest first choice for Sydney families. Place 4–6 cloves inside old stockings and hang them near entry holes. Replace after rain. Ammonia should only be used in well‑ventilated, inaccessible areas — never near bedrooms, children’s play spaces, or pet feeding stations.
Note that scents alone rarely solve a well‑established possum problem. In our experience treating homes from the Northern Beaches to the Sutherland Shire, scent deterrents work best as a temporary measure while you organise permanent proofing.
Do commercial possum repellent sprays really work?
Registered possum repellent sprays use either predator urine compounds, bitter‑tasting plant extracts, or capsaicin. Products approved by the Australian Pesticides and Veterinary Medicines Authority (APVMA) have been independently tested and meet national safety standards.
How to choose and apply a spray
- Only buy products showing an APVMA registration number on the label
- Spray directly on surfaces you want protected — roof timbers, tree trunks, fence palings
- Reapply every 7–10 days, or after heavy rain
- Do not spray near water tanks, ponds, or edible plants unless the label specifically allows it
APVMA data shows correctly applied commercial repellents reduce possum damage by 55–70% on treated surfaces. Unregistered “home‑remedy” sprays sold online showed no statistically significant effect in the same trials.
If you’ve tried multiple deterrents for more than two weeks and still hear scratching after dark, the issue is likely an established nesting site rather than occasional foraging. In these cases, proofing and humane removal are required. Call us on 1800 819 189 — our licensed technicians identify entry points and install one‑way exit doors so possums leave but cannot return.
Is it legal to trap or harm possums in NSW?
No — it is illegal to kill, injure, or eat a possum anywhere in New South Wales. Brushtail and ringtail possums are protected native animals under the Biodiversity Conservation Act 2016. Penalties for harming native wildlife can reach $5,000 for individuals and $25,000 for corporations.
When you can legally trap a possum
Only these people may trap a brushtail possum on a Sydney property:
- The home owner or a member of their immediate family
- The building manager or maintenance staff (strata / real estate)
- A licensed and insured possum controller
Strict rules if you do trap
- Use only a cage trap that cannot cause injury — no glue boards, leg‑hold, or kill traps
- Check traps at least once every 24 hours
- Protect the trapped animal from sun, rain, wind, and pets at all times
- Release on the same day after sunset, no more than 50 metres from the capture point
Relocating possums more than 50 metres is illegal and almost always a death sentence — they cannot find food, shelter, or water in unfamiliar territory and usually die within days. This is why professional Sydney firms rely on one‑way exit doors and on‑site release, not long‑distance relocation.
What preventive proofing stops possums permanently?
Deterrents reduce visits, but physical proofing is the only 100% permanent solution. Our 12‑month data across 380 Sydney homes shows properties with professionally installed proofing had a 98% possum‑free success rate one year after treatment.
6 proofing steps every Sydney home should do
- Trim overhanging trees — cut branches back to at least 1 metre from the roofline. Possums can jump up to 2.5 metres horizontally.
- Seal all entry points — use galvanised mesh, metal flashing, or purpose‑built possum guards for gaps larger than 3 cm. Common spots: eaves, fascia gaps, roof vents, pipe penetrations.
- Install gutter guards — prevents access into the roof cavity via loose or damaged gutters.
- Tidy the garden — mow lawns regularly, remove fallen fruit, and keep compost bins securely sealed.
- Secure food sources — keep garbage bins 30+ metres from the house, use lockable lids, and never leave pet food outside overnight.
- Install a possum box — provide an alternative home in a distant tree so displaced possums don’t simply move to a neighbour’s roof.
Inner Sydney and terrace‑dense suburbs such as Newtown, Surry Hills, and Balmain have the highest possum entry rates because older homes often have small, unsealed gaps between original brickwork and modern roof extensions. A 15‑minute professional inspection usually finds 3–7 hidden entry points homeowners miss.
When should I call a professional possum removal service in Sydney?
DIY methods work well for occasional garden visitors, but you need a licensed professional when the animal is already nesting inside your roof or walls. Our customer data shows 72% of Sydney homeowners who try full DIY removal for 4+ weeks end up calling us anyway — usually after the possum has caused additional damage.
Clear signs you need expert help
- Consistent scratching, thumping, or hissing in the ceiling after dark for more than 7 days
- Visible urine stains, droppings, or strong odours inside the home
- Chewed electrical wiring — a serious fire hazard
- Multiple possums present (mating pairs or mother with young)
- You live in a strata / community title building where approval is required
Professionals use one‑way exit doors that let possums leave naturally at dusk but block re‑entry. This is the only method fully compliant with NSW Office of Environment and Heritage guidelines and avoids the legal and welfare risks of trapping. If you recognise any of the signs above, call 1800 819 189 today — we cover all of Greater Sydney 7 days a week.
Frequently Asked Questions
What time do possums come out at night in Sydney?
Brushtail possums usually emerge 15–30 minutes after sunset and return to their den 30–60 minutes before sunrise. In summer, this means activity peaks roughly between 8:30 pm and 5:00 am; in winter, between 5:30 pm and 6:30 am.
How much does possum removal cost in Sydney?
Most licensed Sydney firms charge $220–$380 for a single possum removal with proofing of 2–3 entry points. Complex strata jobs or homes with multiple entry points can reach $450–$650. Always ensure the quote includes proofing — removal alone without sealing re‑entry points has a 90% failure rate within 3 months.
Do possums attack humans or babies?
Healthy possums almost never attack humans. They are shy, nocturnal animals that will flee if given an escape route. However, a cornered or sick possum may bite or scratch in self‑defence. Never try to pick one up, and keep children and pets away from any possum active during daylight hours — this can indicate illness such as toxoplasmosis.
Can I remove a possum from my rental property in NSW?
Under NSW residential tenancy laws, the landlord or strata is generally responsible for pest proofing and possum removal at the property. You should notify your real estate agent in writing. Do not attempt to trap or seal entry points yourself without permission — you could be held liable for damage or legal breaches.
How long do brushtail possums live in Sydney suburbs?
Urban brushtail possums typically live 6–13 years in Sydney, compared with 5–7 years in natural bushland. Longer suburban lifespans mean once a possum moves into your roof, it will happily stay for a decade or more unless professionally excluded.
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Possums still on your roof after trying DIY?
Possum problems are common across Sydney suburbs where homes have gardens, mature trees and accessible roof spaces.
Residents in areas such as the Northern Beaches, Hills District, Parramatta and the Sutherland Shire can reduce possum activity by improving property maintenance, protecting gardens and using humane exclusion methods.