Running Noises in the Roof: Possum or Rodent?

Fast, light, scurrying running is the sound most consistent with rodents. Rats and mice are small, light and quick. Their movement through a roof space tends to sound rapid and fleeting — a quick dash from one point to another, often accompanied by scratching or gnawing sounds.

If the running sounds like something small darting across the ceiling, stopping and starting, and you occasionally hear gnawing or chewing sounds as well, that pattern leans toward rodents. Rodents can access much tighter spaces than possums, so if the sound seems to come from within a wall cavity or a very narrow gap, that also points toward rodents.

Heavy, deliberate movement — the sound of something with real weight walking rather than running — is more consistent with a possum. Common Brushtail Possums are solid animals, and their movement through a roof space tends to sound purposeful: heavy footsteps, thumping and rolling, as though someone is moving furniture around above you.

A possum may also produce running sounds, but they are heavier and slower than rodent running. The distinction is one of weight and rhythm: possum movement is deliberate and weighty; rodent movement is quick and light.

Possums follow a more predictable activity pattern. They typically wake around dusk, leave their shelter between dusk and approximately 11pm — most commonly around 7pm to 9pm — and return to shelter in the early hours, roughly 3am to 6am. If the running noise follows this pattern — present in the evening and early morning, absent during the day — that leans toward possums.

Rodents are less predictable and can be active at any time. If you hear running during the day as readily as at night, that pattern leans away from possums and toward rodents — though it is not conclusive on its own, as some birds also move during the day.

No single piece of evidence — not the sound, not the timing, not the location — is sufficient to confirm what is in your roof. Diagnosis requires correlation of multiple factors:

• The weight and speed of the movement (heavy and deliberate, or light and fast).
• The timing of the activity (predictable nocturnal pattern, or irregular).
• The location of the sound (ceiling cavity, wall void, narrow gap).
• Physical evidence found during inspection: droppings, damage, entry points, nesting material.
• Your own observations: have you seen an animal on the roof, in the garden, or near the eaves?

A specialist combines all of this — your observations and the physical evidence in the roof — to identify what is actually there and how it's getting in. That is what makes the recommendation evidence-based rather than assumed.

You don't need to know what animal it is to book an inspection — that's what the inspection is for. But noting what you've experienced helps the specialist know where to focus:

• Is the running heavy or light?
• Does it happen at a predictable time or randomly throughout the day and night?
• Does it seem to come from the ceiling, a wall, or a specific area?
• Have you seen any animal on or near the roof?

If you'd like to discuss what you're experiencing before booking, you can speak with Kate — our possum and rodent diagnosis assistant — who can help you understand what your observations might mean. Booking remains the fastest way to a confirmed diagnosis.