Signs of Rats in the Loft and What to Do Next

The clearest signs of rats in a loft are scratching or scurrying noises after dark, dark droppings on or in the insulation, gnaw marks on timber, cables or pipe lagging, and flattened runs through the insulation. Rats usually reach a loft from outside, by climbing walls, pipes or overhanging branches, or by travelling up inside cavity walls. Mice leave similar signs on a smaller scale, so the size of the droppings is the most useful way to tell the two apart. Once rat activity is confirmed, finding the way in matters as much as the treatment, because rats removed from a loft that stays open are usually replaced by more.

What do rats in the loft sound like?

Rats in a loft usually make scratching, scurrying or gnawing sounds, heard mostly after dark when the house is quiet. Rats are mainly nocturnal, so the noise tends to start in the evening and carry on through the night. A heavier, running sound across the ceiling or a steady gnawing from one spot points towards rats rather than mice. Noise that is loudest in the early morning and during the day is more typical of squirrels, which are active in daylight.

What do rat droppings in a loft look like?

Rat droppings are dark brown, pellet shaped and about 10 to 14mm long, often with blunt ends. Mouse droppings are much smaller, about 3 to 6mm, and thinner, so a handful of droppings is usually enough to tell which animal is present. In a loft, rat droppings collect along joists, beside the water tank, near the eaves and along the routes the rats use each night. Fresh droppings are dark and soft, while older ones turn dull and crumbly, which helps show whether the activity is current.

What other signs of rats show up in a loft?

Rats in a loft often leave flattened tunnels or runs through the insulation, shredded insulation or packaging used as nest material, and gnaw marks on joists, stored boxes, pipe lagging and electrical cables. Gnawed cables matter most, because damaged wiring is a fire risk and should be checked by an electrician. Rats also leave dark, greasy smear marks where their fur rubs repeatedly against timber or around a gap. A stale, ammonia-like smell in the loft can come from a build-up of rat urine where activity has gone on for some time.

How do rats get into a loft?

Rats get into a loft through gaps at the roof line, such as damaged soffits, fascias, lifted tiles and unsealed eaves, and through gaps where pipes and cables pass through the walls. Rats climb well, so rough brickwork, downpipes, climbing plants and branches touching the roof can all give them a route up. Rats can also travel up inside cavity walls from ground level, sometimes having first entered through a damaged air brick or a defective drain. Finding the actual entry point usually means checking the outside of the building as carefully as the loft itself.

Could the noise in the loft be something other than rats?

Noise in a loft can also come from mice, grey squirrels, nesting birds or, in summer, a wasp nest. Mice make lighter, quicker sounds and leave much smaller droppings than rats. Grey squirrels are active in daylight, make heavy thumping and running sounds, and often leave chewed timber around their entrance at the roof line. Birds are usually heard at dawn near the eaves, and a wasp nest produces a steady humming on warm days rather than scratching.

Is it safe to check the loft for rats yourself?

Checking a loft for signs of rats is usually safe if you look rather than disturb anything. Wear gloves, take a good torch, stay on the joists or boarded areas, and avoid touching droppings, nest material or insulation that looks soiled. Rat urine and droppings can carry infections, including leptospirosis, so droppings should not be swept up dry, because sweeping raises dust. If droppings do need cleaning up, spray them with disinfectant first and wipe them up wearing disposable gloves.

What happens if you disturb a rats' nest in the loft?

Disturbing a rats' nest in a loft can push the rats into another part of the building, such as the wall cavities or the space beneath the floor, which is why it is best avoided. Moving nest material also brings you into close contact with urine and droppings. Leaving the nest where it is gives a pest controller the clearest picture of where the rats are living and which routes they use. If rats are also being heard below the ground floor, the guide to rats under floorboards covers that part of the house.

Why is putting poison down in the loft not always the answer?

Putting shop-bought rat poison loose in a loft can leave rats dying inside the roof space or wall cavities, where the smell of a decomposing rat is hard to reach and can last for some time. Loose bait can also be carried off by rats and reach pets or wildlife, and it does nothing to close the gap the rats used to get in. Rats are wary of new objects in their environment, so traps and bait placed without knowing their routes are often ignored. A treatment that pairs control with finding and sealing the entry point is more likely to leave the loft rat free.

When should you call a pest controller about rats in the loft?

A pest controller is worth calling about rats in the loft as soon as droppings, gnawing or night-time noise confirm that rats rather than mice are present, and especially if cables have been gnawed. GEM Services, a BPCA member, surveys the loft and the outside of the building to find where rats are getting in, then treats the activity and proofs the entry points. Same-day visits are possible where the diary allows, and every job is quoted before anyone visits. Details of how the treatment works are on the rat control service page, and the quickest next step is to request a quote.