What have you seen?
A person in a dust mask crouching in a roof space, shining a torch along the rafters

Perth suburbs

Pest control in Thornlie

Small reserves, and the place two rivers meet.

Thornlie keeps small pockets of bushland and wetland, and the Southern River meets the Canning here, so the first question for a noise in the roof is whether it's a possum, a rat or something else.

Seen a pest in Thornlie?

What have you seen?

Wasp nest or bees near people? Keep children and pets away. Trouble breathing after a sting: call 000.

Only one local pest business gets your number.

  • Matched to what you've seen
  • Only one local pest business gets your number.
  • Matched to what you've seen

    Before a pest business can take jobs from Which Pest, we record the jobs it handles, so a termite job never goes to a business that only sprays for spiders.

  • Only one local pest business gets your number.

    We pass your contact details to one local pest business so it can contact you about this job.

What happens next

A local pest business calls you.

What have you seen?
  1. Tell us what you've seen

    The pest, one detail about it, and your postcode. A few taps.

  2. We pass it on

    We pass your enquiry to one local pest business that handles exactly this. They quote, do the work and deal with you directly.

  3. They call you

    The pest business talks it through, usually inspects first, and quotes in writing. You decide.

The Perth skyline across the Swan River
The Perth skyline across the Swan River.

Updated 3 November 2026 · Written by the Which Pest team · How we check our facts

What's different in Thornlie

Hume Road Wildlife Reserve

The City of Gosnells says this three hectare reserve holds banksia woodland, marri woodland and melaleuca wetland, and calls it a haven for birdlife.

Tom Bateman Reserve Bushland

On Wilfred Road, this is 6.61 hectares of bushland next to two constructed wetland areas.

Where two rivers meet

The Southern River joins the Canning at a foreshore reserve between Burslem Drive Bridge and Corfield Street. The City says previous records there show the common brushtail possum, the south-western snake-necked turtle and the quenda.

Working out what's in the roof

  1. Note the timing

    Heavy thumps around dusk suggest a possum heading out to feed. WA's DBCA says rats and mice are often mistaken for possums, especially in winter.

  2. Look at the droppings

    DBCA gives more than 2 cm for possums, about 1.5 cm for rats and under 1 cm for mice.

  3. Don't block anything yet

    Sealing a gap with an animal inside causes a worse problem. In WA, native fauna is protected, and DBCA says only trained people with the right licence should handle possums.

  4. Then call it in

    For a possum, the job is proofing, with the last gap closed after sunset once it has gone out to feed. For rats, a pest business finds the way in and sets out a plan.

Rats in the cooler months

The City of Gosnells says rats look for shelter when it's cold, and that can mean homes and outbuildings. Clear out sheds, keep wood stacked off the ground, and tell the City's Health and Compliance section if the activity seems to come from a neighbour's place.

Termites and timber

WA's Building and Energy recommends a termite inspection at least once a year, plus a look around your own place every six months. Firewood and stored timber should sit well away from the house, raised off the ground and covered. Don't disturb anything you find. Leave it, and call a termite inspector.

Wasps

Nearly all the wasp reports the City gets are paper wasps, which a pest business can deal with. If yours look lemon yellow and are using a hole in the ground, leave them be and report them to DPIRD.

Where we'd start with pests in Thornlie

Start with the droppings and the timing, because they tell you which job you've got. If it's a possum, ask for proofing. If it's rats, ask how they're getting in. Tap what you've found and your postcode.

Want someone to look at it?

Tell us what you've seen and your postcode, and a local pest business that handles exactly that calls you to talk it through.

What have you seen?

Questions

Pest control in Thornlie: common questions

Are there possums near me in Thornlie?

Common brushtail possums are on the record at the river foreshore reserve, and DBCA says they've adapted to urban areas. That's not the same as saying one is in your roof, so check first.

Could a small animal in the garden be a native?

Yes. Quenda are on the record at that same reserve, and native fauna is protected in WA. Be sure what it is before anyone sets a trap or bait.

Seen a pest in Thornlie? Tell us what it is.

What you have seen, one tap about it and your postcode. Then a local pest business that handles exactly that calls you.

Before anyone starts

The licence rules where you live

Where this information comes from

Rules and advice change, so check the source before you act on anything here. How we write and check these pages.

What have you seen?