Most people find evidence long before they see a rat. Knowing what each sign means — and how fresh it is — tells you how serious the problem is.
Droppings, gnawing damage, smear marks, runs, noises and burrows. Droppings are the most reliable single indicator: dark, tapered, and about the size of a large grain of rice or bigger.
The most useful question is not whether you have signs but whether they are fresh — and there is a straightforward way to find out, set out below.
The most reliable evidence. Rat droppings are dark brown to black, roughly 15mm long, tapered at one or both ends, and usually found in concentrated groups along a route or in a corner.
The freshness test matters more than the presence. Fresh droppings are dark, slightly moist and shiny. Older ones dry out, go grey and crumble when pressed with a stick. Sweep an area clean, note the date, and check again in three days — new droppings mean current activity, and none means it may have moved on.
Rats gnaw continuously because their incisors never stop growing. Look for damage to woodwork, plastic pipework, cable insulation, food packaging and stored goods. Fresh gnawing shows pale, clean wood; older damage darkens.
Dark greasy streaks along the base of walls, on beams, around pipe entries and at the edges of runs. Rats have poor eyesight and follow familiar routes by touch, brushing the same surfaces repeatedly. Smears indicate an established, regularly used route rather than a passing visit.
Trodden pathways through grass, undergrowth or dust, usually following a wall, fence line or other edge. In a loft, look for tracks through dust or flattened insulation.
Scratching, scurrying and dragging sounds, mostly after dark. Rats range through a building more than squirrels — walls, floors and ceilings as well as the loft.
Outdoors: fist-sized holes in soil, under decking, beside sheds or against foundations. An active burrow has a smooth, worn entrance and no cobwebs across it.
See our complete service, published prices and treatment information.
View Rat Control Harrow →| Rat | Mouse | |
|---|---|---|
| Dropping size | ~15mm, tapered | 3–6mm, small specks |
| Dropping quantity | Fewer, concentrated | Many, scattered widely |
| Gnawing | Substantial, on hard materials | Finer, mainly packaging |
| Smear marks | Common | Rare |
| Noise | Heavier, with dragging | Light, fast skittering |
| Caution | Wary of new objects | Curious, investigates readily |
| Treatment | £190 / £240 | £190 / £240 |
The prices are identical, but the approach differs and misidentification wastes a visit. If in doubt, photograph the droppings next to something for scale and send it with your enquiry.
| What you have found | What it suggests |
|---|---|
| A few old dry droppings in a shed | Past or occasional activity |
| Fresh droppings returning after cleaning | Current, active problem |
| Smear marks along a wall | Established route, ongoing |
| Gnawed cabling | Act promptly — fire risk |
| A sighting indoors | Established activity, usually more than one |
| A daytime sighting | Often a larger population competing for space |
| Burrows against the house wall | Worth investigating properly |
| One rat crossing the garden | Ordinary — not evidence of a house problem |
That last row is worth dwelling on. Rats live outdoors across the whole of London and a single garden sighting is not a house problem.
Rat droppings and urine can carry organisms that cause illness in people. That is a reason for sensible care rather than alarm:
Treatment is available throughout Harrow and every surrounding area at £190 for a flat and £240 for a house.
Impossible to say precisely, but rats are not conspicuous, so a sighting indoors generally means established activity rather than a lone visitor.
Waiting rarely improves a rodent problem, and gnawed cabling is the reason not to.
Please do. A photograph of droppings next to a coin for scale settles the rat-or-mouse question immediately.
Different signs entirely, same clear pricing — wasp nest treatment across Harrow is £90 fixed cost, guaranteed.
Droppings, gnawing damage, dark smear marks, trodden runs, night-time noises and outdoor burrows.
Dark brown to black, roughly 15mm long, tapered at the ends, usually in concentrated groups.
Fresh ones are dark, moist and shiny; old ones are grey, dry and crumble. Sweep an area clean and check again after three days.
Rat droppings are much larger — around 15mm and tapered — while mouse droppings are small dark specks 3 to 6mm long.
Dark greasy streaks where rats repeatedly brush against surfaces. They indicate an established, regularly used route.
Often, yes. It can suggest a larger population competing for space and food.
With care. Dampen with disinfectant first rather than dry-brushing or vacuuming, wear gloves, and wash your hands afterwards.
No. Rats live outdoors throughout London — indoor evidence is what indicates a house problem.
Tell us what you have found and where. A photograph of the droppings settles the rat-or-mouse question immediately.
Prefer to talk? Call 0203 151 6640 or WhatsApp us.
