You hear a faint scratching above the ceiling. Something scurries behind the skirting board. A strange, stale smell lingers under the kitchen sink. If any of this sounds familiar, you may already be looking for signs of rats in your house.
You are not alone. According to Rentokil Pest Control, rats accounted for 25% of all recorded pest activity across the UK in 2025. Here in Kent, older housing stock, rural-urban fringe environments, and proximity to waterways like the River Medway and Thames estuary make residential properties especially vulnerable.
This guide covers the eight signs our BPCA-certified technicians look for on every inspection, how rats get into Kent homes, and exactly what to do if you spot a problem. With over 40 years’ experience treating rat infestations across the South East, Gold Standard Pest Solutions has seen every scenario. Here is what you need to know.
What Are the Signs of Rats in Your House?
Signs of rats in your house include droppings near food sources or along skirting boards, gnaw marks on wood and wiring, scratching or scurrying noises at night, dark grease marks along walls, shredded nesting materials in hidden spaces, a strong ammonia-like smell, footprints or tail marks in dusty areas, and sightings of live or dead rats. Spotting even one or two of these indicators warrants further investigation.
Each sign tells you something different about the severity and location of the problem. The sections below break down every one in detail so you can assess your own property with confidence.
8 Telltale Signs of a Rat Infestation
These are the same indicators our pest control technicians check during a professional survey. Work through them one by one, paying close attention to kitchens, lofts, cellars, garages, and any spaces that are rarely disturbed.
1. Rat Droppings
Rat droppings are dark brown or black, spindle-shaped, and roughly 10 to 20mm long, similar in size to a large grain of rice. Fresh droppings are shiny and soft. Older ones turn grey and crumble when touched.
Rats produce around 40 droppings per day, so even a small population leaves noticeable evidence quickly. Check behind the fridge, under the kitchen sink, along skirting boards, inside cupboards, and in loft spaces. Droppings tend to cluster near nesting sites and along established travel routes.
Fresh droppings confirm an active infestation. If the droppings you find are dry and crumbly, the problem may be older, but that does not mean the rats have left. They may have simply moved to a different part of the property.
2. Gnaw Marks and Structural Damage
Rat incisors grow continuously, which forces them to gnaw on hard materials to keep their teeth filed down. You may notice rough, jagged bite marks on wood, plastic, pipes, skirting boards, kitchen cupboards, and loft beams.
One of the most serious risks is damage to electrical wiring. Rats strip the insulation casing from cables, creating a genuine fire hazard. According to the BPCA, rats are responsible for a significant number of unexplained house fires in the UK each year.
We recently attended a Victorian terrace in Gravesend where rats had entered through a collapsed drain junction in the cellar. By the time the homeowner called us, the rats had chewed through multiple electrical cables running along the basement joists. Early detection would have prevented hundreds of pounds in rewiring costs.
3. Scratching and Scurrying Noises at Night
Rats are nocturnal. The most common complaint we hear from Kent homeowners is scratching, gnawing, or rapid scurrying sounds coming from inside walls, ceilings, or under floorboards after dark.
Brown rats (the most common species in the UK) tend to nest at ground level, so you will often hear them under floorboards or in wall cavities. Black rats are rarer but prefer higher locations, meaning noises from the loft or roof space could indicate their presence.
Brown rats also produce a distinctive teeth-grinding sound known as bruxing, which can be heard through thin walls. Be aware that squirrels can create similar scratching noises, so correct identification is important before treatment begins.
4. Grease and Rub Marks Along Walls
Rats have poor eyesight and rely on established routes to navigate your home. As they travel the same paths repeatedly, oils and dirt from their fur leave dark, greasy smears along skirting boards, walls, and floor edges.
These rub marks build up over time and are a reliable indicator of well-established rat runs. To spot them, shine a torch at a low, raking angle along walls and skirting boards. The marks appear as dark smudges or streaks, usually at a consistent height from the floor.
5. Nests and Shredded Nesting Materials
Rats construct nests from whatever soft materials they can find: shredded paper, fabric, loft insulation, cardboard, and dried plant matter. These nests are rarely visible in the open. They are typically hidden behind appliances, inside wall cavities, beneath floorboards, or tucked into undisturbed corners of lofts and garages.
Finding piles of shredded material in hidden areas is a strong sign that rats have established a breeding site. Do not disturb a nest yourself. Rats carry diseases that can be transmitted through urine, droppings, and bites, so always call a professional pest controller to handle removal safely.
6. A Strong, Unpleasant Smell
A rat infestation produces a distinctive, stale ammonia-like odour caused by concentrated rat urine. The smell intensifies as the infestation grows and is often strongest in enclosed spaces like under-stair cupboards, loft hatches, and behind kitchen units.
A different, decaying smell may indicate a dead rat trapped inside a wall cavity or beneath floorboards. The stronger the odour, the closer you are to the source of the problem.
7. Footprints and Tail Marks
In dusty or rarely visited areas of your home, rats leave visible footprints and tail drag marks. Lofts, cellars, and garages are the most common places to spot them.
A simple test: sprinkle a thin layer of flour or talcum powder along a suspected route before you go to bed. Check for tracks the next morning. Rat footprints measure roughly 20mm, with a distinctive central line left by the tail dragging between the paw prints.
8. Sightings of Live or Dead Rats
Seeing a rat during daylight hours is a strong indicator of a severe infestation. Rats are nocturnal and will only venture out during the day when their nesting areas are overcrowded or food sources are scarce. A daytime sighting suggests the population has grown beyond what the available shelter can support.
Dead rats on your property may indicate poisoning activity from a neighbouring building, or that a rat has died of natural causes within your walls. Either way, it confirms rat activity in your immediate area and warrants a professional inspection.
Is It Rats or Mice? How to Tell the Difference
Many homeowners struggle to tell whether they are dealing with rats or mice. The distinction matters because treatment strategies differ significantly. Mice are curious and interact readily with traps and bait, while rats are far more cautious and often avoid new objects in their environment.
Use this quick comparison to identify which pest you are dealing with:
| Feature | Rats | Mice |
|---|---|---|
| Droppings | 10 to 20mm, capsule-shaped | 3 to 8mm, small pointed grains |
| Body size | Up to 25cm (excluding tail) | Up to 10cm (excluding tail) |
| Tail | Thick, shorter than body, scaly | Thin, longer than body, lightly furred |
| Behaviour | Cautious, avoids new objects | Curious, investigates quickly |
| Nesting | Ground level, wall cavities, drains | Higher locations, inside furniture, wall voids |
| Gnaw marks | Large, rough tooth marks | Small, neat tooth marks |
| Noise | Scurrying, bruxing (tooth grinding) | Light scratching, squeaking |
If you are still unsure, a professional pest controller can confirm the species during an inspection and recommend the right approach.
How Do Rats Get Into Your House?
Rats are resourceful. They can squeeze through a gap as small as 25mm, and they are strong enough to gnaw through wood, plastic, aluminium, and even some concrete. Understanding how they enter your property is essential to preventing reinfestation after treatment.
The most common entry points in Kent homes include:
- Broken or defective drains and sewers. Rats travel through the underground drainage network and emerge through cracked pipes, displaced junctions, or uncapped connections. This is the single most common entry route in older Kent properties, especially in towns like Gravesend, Maidstone, Canterbury, and Tunbridge Wells.
- Gaps around pipework where it passes through external walls into kitchens and bathrooms.
- Damaged or missing airbricks and ventilation grilles on external walls.
- Gaps beneath external doors, particularly older doors with worn or missing draught excluders.
- Overgrown vegetation against exterior walls, which provides cover for rats to access the building undetected.
- Cavity walls in period properties. Many Kent homes have older cavity wall construction that creates hidden pathways from ground level to loft space.
Property owners have a legal obligation under the Prevention of Damage by Pests Act 1949 to keep premises rodent-free, or to report infestations to their local authority if rodents threaten health or property.
Why a Rat Problem Will Not Go Away on Its Own
Ignoring the signs of a rat infestation does not make the problem disappear. It makes it worse. Rats are prolific breeders. A single pair can produce over 200 offspring in a year, with a new litter arriving roughly every 21 days.
The risks of delayed action include:
- Health hazards: Rats carry bacteria responsible for leptospirosis (Weil’s disease), salmonella, and Hantavirus (rare in the UK but documented). Rat droppings and urine can also trigger asthma and allergic reactions.
- Fire risk: Chewed electrical wiring with exposed conductors is a direct cause of short circuits and house fires.
- Structural damage: Gnawed pipes can cause flooding. Damaged insulation reduces energy efficiency. Compromised woodwork weakens structural integrity over time.
- Escalating costs: Checkatrade data from 2025 puts the average rat removal cost at £120 to £240. That is a fraction of what delayed action costs. Aviva reported that the average rodent-related car insurance claim reached £2,494 in 2024, with some claims exceeding £24,000.
Every week of inaction gives rats more time to breed, spread, and cause damage. Early professional intervention is always cheaper than dealing with the consequences of a full-blown infestation.
What to Do If You Spot Signs of Rats
If you have identified one or more of the signs above, take these steps right away.
Immediate Actions
- Do not disturb nests or attempt to handle rats directly.
- Store all food in sealed, hard-sided containers.
- Clean up droppings safely: wear rubber gloves and a face mask, dampen the area with disinfectant before sweeping, and dispose of waste in a sealed bag.
- Block obvious gaps temporarily with wire wool or metal mesh as a short-term measure.
Rat Prevention Tips for Kent Homeowners
- Keep gardens tidy and remove fallen fruit promptly.
- Secure bin lids and avoid leaving rubbish bags in the open.
- Cut back vegetation touching exterior walls, fences, and rooflines.
- Arrange a CCTV drain survey if your property is older or has a history of drainage issues.
- Seal gaps around pipework, repair damaged airbricks, and replace worn door seals.
When Should You Call Pest Control for Rats?
Call a professional pest controller if you have spotted two or more of the signs listed in this guide, if you see a rat during daylight hours, or if DIY methods have failed to resolve the problem. A professional inspection identifies the root cause of the infestation, not just the symptoms, and ensures long-term prevention through proofing and targeted treatment.
At Gold Standard Pest Solutions, our BPCA-certified technicians provide fast, discreet rodent control services across Kent and the South East. We use humane methods, respond 24/7, and have over four decades of hands-on experience treating rat infestations in residential properties.
Protect Your Kent Home Before the Problem Grows
Rats leave clear evidence of their presence long before you see one in person. Droppings, gnaw marks, scratching sounds, and grease trails are your early warning system. Recognising these signs quickly is the single most effective way to prevent costly damage and protect your family’s health.
If you have recognised any of these signs in your Kent home, Gold Standard Pest Solutions can help. Our team offers a discreet, 24/7 service with humane methods and over 40 years’ experience across the South East. Call us on 0800 910 1179 or visit our contact page to arrange a free initial consultation.
Not sure whether what you have found is a sign of rats? Give us a call or send us a photo. We are happy to help you identify the problem at no cost.