Possum in the Roof? What Sydney Homeowners Should Know

Heavy thumping above the ceiling after dark is an unsettling sound, and in Sydney, there's a good chance the culprit is a possum.

Possums in roofs are one of our most common call-outs, and one of the most misunderstood. They're protected native animals, the DIY removal method most people try first is actually illegal, and getting it wrong can leave an animal trapped inside your ceiling. Here's what's really going on up there, and how to deal with it properly.

Why possums move into roofs

The common brushtail possum is the species you're most likely to hear. It's about the size of a house cat, and a roof cavity offers almost everything a possum wants: warmth, shelter from the weather, safety from predators, and a short commute to the garden.

Ringtails, the smaller cousins, usually build their nests in dense foliage and only occasionally end up under a roof, so if something has clearly moved in above your head, a brushtail is the best bet.

Entry points are often smaller than people expect: lifted or cracked tiles, gaps around eaves, worn vents, and openings where pipes or wiring run into the roof. Possums are strong climbers and will scale a tree, a fence or a wall to reach a gap once they've found it.

Once a possum is in, it tends to stay. The roof is a secure den, and possums are creatures of habit: the same animal will use the same entry point night after night, often for months, until it's encouraged out and the gap is closed.

Signs it's a possum (and not a rat)

Getting the identification right matters, because the two problems need completely different responses:

• Heavy, slow footsteps and thumps. Possums are big animals, and they sound like it. A guttural growl or hiss isn't unusual either.
• A nightly routine. Possums generally leave shortly after dusk and return before dawn. Scratching and rustling that continues all night points to rats or mice instead. Our rodent control team deals with those every week.
• Droppings, stains and smell. Possum droppings near an entry point, urine stains on the ceiling and a strong ammonia odour are common giveaways.
• A flour test. Sprinkle a little flour on the suspected path and check for footprints the next morning: possum prints are about the size of a cat's.

What NSW law says about removing a possum

Possums are protected in New South Wales under the Biodiversity Conservation Act 2016, and the law takes a stricter view of removal than most people realise. Catching a possum counts as harm under the Act, so trapping, relocating or killing one without a licence is illegal. For an individual, penalties can reach a maximum of $22,000 plus $2,200 per animal.

There's a sound reason for the strictness. Possums are territorial, and one relocated away from its home range usually doesn't survive: it's dropped into territory already claimed by resident possums, without a den or an established food supply. Even an operator working under a licence must release a captured possum unharmed after sunset, on the property where it was caught, within 150 metres, against something it can immediately climb.

The NSW Government's guide to removing a possum from your roof sets out the approved approach in full, and the catch-and-release licensing page explains how licences work and what to check before hiring anyone.

How humane eviction works in practice

The approved approach starts with giving the possum somewhere better to live. In broad strokes, the NSW Government's process looks like this:

• Watch at dusk to pinpoint how the possum is getting in and out.
• Provide a better option: a possum box mounted at least four metres up a tree, ideally with the old nest material moved inside so it smells like home.
• Make the roof less appealing with quassia chips and a light left on in the cavity for three days and nights.

• Once you're certain the possum has left (and that it hasn't left young behind), seal the entry point for good, then check the rest of the roofline for other gaps.

That last step is where things go wrong. Seal too early and you trap an animal inside your ceiling. Seal while joeys are still dependent on their mother and the outcome can be far worse. Brushtail joeys can be in the pouch or riding on their mother's back for much of the year, so a careful check always comes before any sealing.

Handling the eviction, the roof check and the proofing in one visit is exactly what our possum removal service does, humanely and within the NSW rules. If you'd rather not be clambering around your own roofline at dusk, fair enough; book a visit and we'll take it from there.

Keeping possums out for good

Once the roof is clear, a few jobs make a repeat tenancy much less likely:

• Trim branches back so they no longer overhang the roofline, removing the climbing route.
• Wrap sheet-metal collars (about 60 centimetres wide, 60 centimetres above ground) around tree trunks that give possums a path to the roof.
• Repair damaged tiles, vents and eave gaps before they become the next entry point.
• Never feed possums. NSW guidance is blunt: feeding makes wildlife dependent, can make animals aggressive, and common foods are actively harmful. Keep pet food in overnight and compost bins closed.

If you're hearing something up there right now

Don't set a trap, and don't seal anything until you're certain the roof is empty. If it's a possum, it needs to be handled by the book. If it's rats, that's a different job with different tools.

Either way, we can help. Jashlin Pest Control handles humane possum eviction, roof checks and proofing across Sydney. Get a free quote or call us on 0450 795 797.

Common questions about roof possums

Will the possum hurt us?

Possums aren't aggressive, and they'll avoid people wherever they can. The real impacts of a roof resident are the noise, the ongoing mess of droppings and urine stains, and the smell. If you're cleaning up in the roof space, treat it like any wildlife clean-up: wear gloves, wipe surfaces down and wash your hands afterwards.

How long until it leaves?

One-way door setups usually get a possum out within a few nights, once it can leave but not return. The mistake people make is sealing too soon. Wait until you're certain the animal is out (and that no young are still inside) before making the fix permanent.

The scratching runs all night. Could it still be a possum?

Possums head out at dusk and come back before dawn, so roof noise tends to cluster around those hours. Sounds that continue all night, or that come from inside wall cavities, are more typical of rats, which need completely different, legal treatment. Worth checking before you act.

Do possums chew electrical wiring?

It's a common claim, but the wildlife authorities point to rats for gnawed wiring, not possums. What possums do leave behind is scratching and chewing damage to soft materials, plus droppings and urine that soak through insulation. Our eviction visits include a roof damage check, so you know exactly what needs repairing.

Can I seal the hole while it's away?

Not until you've confirmed the roof is empty, including checking for young. Sealing an occupied roof traps the animal inside, and if dependent joeys are involved the outcome can be far worse. Checking before sealing is a condition of a licensed handler's permit, and it's why timing matters more than speed.