Signs of rats in the house and garden

Rat droppings: a useful clue, not a diagnosis

Rat droppings are generally larger and thicker than house mouse droppings. Brown rat droppings are often roughly 15–20 mm long, although size varies with the animal and the material can change as it dries. A photo with a ruler placed nearby, without touching the material, is more helpful than a description such as “black pellets”.

Check sheltered edges rather than walking through suspect material: behind a bin, beside a wall, under an accessible shelf or near a pipe opening. Do not pick pellets up to test their texture. Slugs, bats and other animals can leave confusing material, so identification should consider location, feeding damage and nearby access points as well.

Scratching and movement in walls or ceilings

Rats can make scratching, scuffling or gnawing sounds in concealed spaces. They are often active when a house is quiet, but hearing something at night does not identify the species. Mice, squirrels, birds and even pipes can produce sounds that appear to travel through walls.

Write down when you hear the noise, which room it is loudest in and whether it follows a regular route. Listen from a safe, accessible position rather than lifting boards or crawling through insulation. If you also find fresh droppings or damaged food packaging, arrange an inspection. A recording may help describe the problem, but it cannot confirm rats on its own.

Gnaw marks, rub marks and unusual smells

Look for damage around door edges, timber, plastic containers and service openings. New damage may have lighter exposed surfaces, but appearance alone is an unreliable way to date it. Repeated damage in the same place matters more than one old mark left by a previous problem.

Greasy dark smears can build up where rodents repeatedly brush against edges. Dust, shoes and everyday dirt can make similar marks. An unpleasant smell is equally non-specific: a drain defect, damp or spoiled food may be responsible. Do not open electrical equipment to investigate chewing. If cables look damaged, keep clear and ask an electrician to assess them before using the affected equipment.

Garden burrows and routes beside fences

A rat burrow may have a worn entrance with disturbed soil nearby, especially beside a shed, decking or a compost area. However, a hole is not proof of rats. Other wildlife uses gardens, and underground services may be close to the surface. Avoid pushing tools into openings or flooding them to see what emerges.

Check from a distance for a repeated route connecting shelter with food. Fallen bird seed, accessible bins and food scraps are worth addressing whether or not rats are confirmed. Photograph the entrance and nearby surroundings for a controller. Keep pets away, and leave excavation or investigation of uncertain burrows to someone who can identify the occupants and assess the site safely.

How to tell whether activity is current

Old evidence can remain long after rodents have gone. Dropping colour, shine or hardness cannot reliably tell you exactly when it was left. Instead, make a dated record of what you find and compare it with later observations after a safe clean-up or professional visit.

Note the location of each sign, not just the total amount. Fresh damage to a newly stored bag, repeated camera footage or new droppings in a cleaned area are more useful than an undated stain. Do not leave out food to attract an animal for a photograph. Monitoring should help you understand an existing route, not establish a new feeding point beside your home.

What to do first when you suspect rats

Start with changes that reduce access to food and protect people. Put damaged food aside for safe disposal, close food containers and keep children and pets away from suspect areas. Photograph evidence before disturbing it, particularly if you rent or need to report a shared waste problem.

• Put pet food and bird seed in robust, lidded containers.
• Remove leftover pet meals rather than leaving them out overnight.
• Check bin lids and clean food residue around the bin area.
• Tell a landlord or managing agent about signs in shared spaces.
• Arrange inspection before permanently closing an actively used opening.

Do not scatter poison or use a strong scent as a substitute for identifying the route. Closing an entrance without a plan can leave animals inside the building.

Cleaning safely and protecting your health

Keep people away from droppings until you can clean safely. Avoid dry sweeping or ordinary vacuuming, which can disturb contaminated dust. For a small accessible area, ventilate where practical, wear gloves and dampen contamination with a suitable disinfectant used according to its label before careful removal. Never mix cleaning products.

Heavy contamination, inaccessible insulation and food preparation equipment need a more cautious assessment. Ask a professional what cleaning is appropriate. Rat urine can be associated with leptospirosis; protect broken skin and wash your hands after dirty work. If you feel unwell following possible contact with rodent urine or contaminated water, seek medical advice and explain the exposure rather than trying to diagnose yourself from symptoms online.

Where MintGuard helps, and where it does not

MintGuard is a scent repellent made from pressed peppermint, clove and castor oil balls. It is intended as a deterrent alongside food control and proofing, not as a way to identify the animal or clear an established infestation. A strong mint smell does not demonstrate that the route is protected.

One pack contains 12 balls and costs £39. Bundles are £69 for two packs, £89 for three and £109 for four. Each ball lasts 30–60 days. Buy only from mintguard.co.uk; orders have a 90-day money-back guarantee. Keep balls out of reach of children and pets, away from food and in suitable dry positions. The guarantee is a purchase policy, not a promise that rats will leave.

When to call your council or a pest controller

Seek help promptly if signs keep appearing indoors, you see rats entering the building, a nest is suspected or there is damage near wiring. A professional can assess the species, entry routes and appropriate control, then advise when proofing should be completed. Ask whether follow-up visits and a written prevention plan are included.

Use GOV.UK to find your council's reporting route. Services, charges and eligibility vary, and a private contractor may be needed. Report overflowing shared bins or suspected drainage faults to the responsible organisation as well. Glue traps have been illegal for the public to use on rodents in England since 31 July 2024; professional licensing is restricted. Do not assume the same rules apply across every UK nation.

Common questions

Sources

• GOV.UK – Report a pest problem
• NHS – Leptospirosis
• GOV.UK – Glue trap licences