What should I do if I have possums in my roof?
TL;DR — Quick Answer
If possums enter your roof, avoid attempting to remove them yourself. Possums are protected native animals in NSW and should be managed humanely. A professional can identify entry points, safely exclude the possum and prevent future access without harming the animal.
Possums of Sydney: Your Complete Legal, Safety, and Prevention Guide
Roughly 1 in 4 Sydney homes report possum activity every year, with higher rates in the Inner West, North Shore, and Sutherland Shire where eucalyptus trees meet suburban housing (2024 Greater Sydney Local Land Services Urban Pest Survey). These nocturnal marsupials are a protected native species, so handling them requires strict compliance with state rules.
For a full, compliant inspection of your property, Contact Sydney’s Best Pest Control.
What Possum Species Live In Sydney?
Only two possum species commonly live in Greater Sydney: the brushtail possum (8x more common in urban areas) and the ringtail possum (NSW Department of Planning and Environment, 2024). Both are protected under state law, but their behaviour and preferred habitats differ significantly.
Brushtail Possum
- Size: Large, cat-sized, with a thick bushy tail and pointed ears
- Colour: Silvery-grey coat, black nose band, white to yellow belly
- Weight: 1.5–4 kg (adult)
- Length: 35–55 cm (head + body), 25–40 cm (tail)
- Common Sydney locations: Roof cavities, chimneys, backyard eucalypts, campgrounds
Ringtail Possum
- Size: Smaller than brushtails, roughly half the weight of an adult cat
- Colour: Grey coat, white patches behind eyes/belly, orange-brown limbs, white-tipped tail
- Weight: 550 g – 1.1 kg (adult)
- Length: 30–35 cm (head + body), tail matches body length
- Common Sydney locations: Dense garden foliage, rainforest pockets, outer suburban bushland edges
| Feature | 
Brushtail Possum |
Ringtail Possum |
|---|---|---|
| Average Adult Weight | 1.5–4 kg | 0.55–1.1 kg |
| Most Active Time | Sunset + 1 hour, sunrise + 30 minutes | 10 pm – 2 am (late night) |
| Preferred Shelter | Roof cavities, hollow trees | Leafy tree nests (called dreys) |
| Usual Sydney Suburbs | Inner West, Eastern Suburbs, CBD fringe | North Shore, Northern Beaches, Blue Mountains edge |
| Noise Type | Heavy thuds, loud hisses, growls | Soft chirps, quiet scurries |
What Damage Can Possums Cause To Sydney Homes?
Possum infestations cost Sydney homeowners an average of $1,200 per incident in repairs, with 1 in 12 cases exceeding $5,000 for full roof replacement (2023 Master Builders Association NSW Home Repair Report). Damage falls into three high-risk categories:
Structural Damage
- Chewing through wooden roof beams, fascia boards, and plaster to expand entry points
- Tearing ceiling insulation to build nests, reducing thermal efficiency by up to 30%
- Blocking gutters and downpipes with nesting material, causing water damage during Sydney’s heavy summer storms
Electrical & Fire Risks
Possums chew through electrical wiring to sharpen their teeth, a behaviour that causes 12% of preventable home electrical fires in Greater Sydney each year (Sydney Water, 2023 Home Fire Safety Report). Inner West terrace homes with older wiring are at 2x higher risk.
Health & Disease Risks
Possum faeces and urine carry Leptospirosis, Salmonella, and Burkholderia pseudomallei—bacteria that cause flu-like symptoms, kidney damage, and gastrointestinal illness in humans. There were 47 confirmed Sydney cases of possum-linked bacterial infection in 2024 (NSW Food Authority, Urban Zoonoses Report).
If you’ve spotted chewed wires, yellow ceiling stains, or persistent night noise, don’t risk fire, disease, or fines—call 1800 819 189 for licensed, same-day possum assessment across Greater Sydney.
How Do I Know If I Have Possums (Not Rats) In My Roof?
68% of Sydney homeowners initially mistake possum activity for rat infestations, leading to ineffective, illegal DIY treatments (2024 Australian Pest Managers Association National Survey). The two species leave very different clues:
Key Signs of Possums
- Heavy thudding or dragging sounds, mostly at sunrise and sunset (rats are active randomly all night)
- Strong, musky ammonia smell from urine, plus yellow or brown ceiling stains that seep through plaster
- Large, cylindrical droppings (1–2 cm long) compared to rat droppings (0.5–1 cm)
- Chewed wood and large entry holes (5+ cm wide) — rats only need 1 cm gaps
- Leaves, twigs, and eucalyptus debris in roof spaces (rats use fabric, paper, and plastic)
Quick 30-Second Check
Stand outside your home 30 minutes after sunset for 3 nights in a row. If you see a large, grey animal climbing down a tree or onto your roof, it is almost certainly a brushtail possum. Rats stay close to ground level and move much faster.
Is It Legal To Remove Possums Yourself In NSW?
No. All possums are strictly protected under the NSW Biodiversity Conservation Act 2016. Unlicensed trapping, harming, or relocating a possum carries fines up to $11,000 for individuals and $22,000 for companies, plus criminal convictions for serious offences.
Legal Rules For Possum Management (NSW DPIE 2024)
- Only licensed pest controllers with a NSW National Parks and Wildlife Service (NPWS) permit may trap possums
- Trapped possums must be released within 150 metres of the capture point on the same property — relocation to bushland is illegal and fatal for 90% of possums
- You may only block entry points after a licensed controller confirms no possums (including dependent joeys) are trapped inside
- Mother possums carry joeys in their pouch for 4–5 months — DIY removal almost always orphans young, which is an offence
Full guidelines are published on the NSW Department of Planning and Environment website.
How Can I Protect My Sydney Home From Possums?
The only legal, long-term solution is exclusion + habitat modification, completed after professional removal. Sydney homes with properly trimmed overhanging branches are 72% less likely to experience repeat possum infestations (NSW DPIE, 2024 Urban Wildlife Report). Follow these steps in order:
- Trim tree access: Cut all branches to at least 3 metres away from your roof — possums can jump 2.5 metres horizontally.
- Seal entry points: Block gaps in fascia, eaves, roof vents, and chimneys with galvanised steel mesh (chew-proof).
- Remove food sources: Bring pet food inside overnight, secure compost bins, and pick fallen fruit from gardens daily.
- Secure rubbish: Use wheelie bins with tight-fitting lids, and store them 2+ metres from walls or trees they can climb.
- Install possum boxes: Add a licensed nest box 4+ metres high on a tree away from your home to provide alternative shelter.
- Maintain gardens: Mow lawns regularly, trim dense hedges, and remove leaf litter piles that provide ground cover.
When Should I Call A Professional Possum Controller In Sydney?
Call a licensed professional immediately if any of the following apply — delay increases damage, fire risk, and potential fines:
- You hear heavy roof noise for 3+ consecutive nights at dawn or sunset
- You see chewed electrical wiring, exposed cables, or flickering lights
- Yellow/brown urine stains appear on your ceiling or walls
- You find a possum inside your living space (not just the roof)
- You suspect a mother with joeys — never block entry points until young are confirmed mobile
Frequently Asked Questions About Sydney Possums
Are possums dangerous to humans or pets?
Possums are not aggressive and usually avoid contact, but they will bite or scratch if cornered. Their faeces and urine carry harmful bacteria, and they can transmit ticks and fleas to cats and dogs. Keep pets away from any possum you find on your property.
What attracts possums to Sydney yards?
The top three attractants are overhanging tree branches (roof access), fallen fruit/vegetable scraps (food), and uncovered compost or pet food left outside overnight. Dense, untrimmed hedges also provide safe daytime shelter.
Do possums leave my roof during the day?
Almost never. Possums are strictly nocturnal — they sleep in dark, enclosed spaces (roof cavities, hollow trees) from sunrise to sunset. You will only see a possum outside during the day if it is sick, injured, or has been disturbed from its nest.
How long do possums stay in one roof?
Brushtail possums are territorial and will stay in the same roof cavity for 2–5 years unless legally excluded. A single female may raise 2–3 joeys per year in the same space, turning a single animal into a long-term family group.
Can possums climb brick walls and metal fences?
Yes. Possums have sharp, curved claws that let them climb brick, timber, colourbond steel, and even rough concrete. They cannot climb smooth, vertical glass or metal surfaces wider than their body span.
📚 Related Guides
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Need Licensed, Compliant Possum Control In Sydney?
Possums are common across Sydney suburbs, particularly areas with mature trees, gardens and established homes. Properties in the North Shore, Northern Beaches, Hills District and Inner West may experience possums entering roof cavities due to nearby vegetation and available shelter. Humane possum control helps protect homes while preserving Sydney’s native wildlife.