How to Get Rid of Rats and Mice | NZ DIY Guide

A Tauranga Technician’s Guide to Clearing Rats and Mice Yourself, Since Feb 2006

The short answer: work out whether it is rats or mice, set snap traps against the walls where they run, take away their food, and block the gaps they use. Trapping without blocking the gaps only makes room for the next ones.

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🔍 Rat or Mouse?

Ship rat (roof rat)
Ship rat (roof rat)Slim, big ears, tail longer than its body. A climber. The usual rat in roofs.Photo: division, CSIRO, CC BY 3.0
Norway rat
Norway ratBigger and heavier, small ears, tail shorter than its body. Lives at ground level.Photo: Charles J. Sharp, CC BY-SA 4.0
House mouse
House mouseSmall, with a body about as long as your finger.Photo: Ahunt, CC0
Mouse droppings
Mouse droppingsAbout the size of a grain of rice, with pointed ends.Photo: Hansmuller, CC BY-SA 4.0
Rat droppings
Rat droppingsMuch bigger, up to 2 cm long.Photo: NY State IPM Program at Cornell University, CC BY 2.0

🛠️ Step By Step: How to Get Rid of Rats and Mice

1. Find Where They Are Active

Look for droppings, gnaw marks, greasy rub marks along walls and chewed food packets. Listen for where the noise is at night.

2. Set Snap Traps Against the Wall

with the trigger end touching the wall. Rats and mice run along edges, not across open floor.

3. Bait with Peanut Butter

Use plenty of traps. Six traps for a few nights catches more than one trap for a month.

4. For Rats, Leave the Traps Unset for Two or Three Nights First

with bait on them. Rats are wary of new things and this gets them feeding.

5. Take Away the Food

Store food, pet food and bird seed in sealed containers. Pick up fallen fruit and secure the compost.

6. Block the Gaps

A mouse fits through a gap the width of a pencil. Pack holes around pipes with steel wool and fit brush strips under doors.

7. Cut Back Branches That Touch the Roof

and tidy wood piles and long grass near the house.

⚠️ If You Use Rat Bait

Put it in a locked bait station, keep it well away from children and pets, and follow the label. Poisoned rodents can die in walls and ceilings and smell for weeks, which is one reason I prefer traps inside the house.

🏡 When to Call a Professional

  • You can hear them in the roof or walls and cannot get to them.
  • You are still catching them after two weeks.
  • They have chewed wiring or pipes. That is a fire and flood risk.
  • It is a shop, food business, school or rental.

Have a look at our professional rat and mouse control service, or call for a free estimate.

❓ Not Sure What You Have Got?

Our free What’s My Pest picture guide shows the common Bay of Plenty pests, what you can do yourself, and when to call us.

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