If you've heard scratching in the walls of your Old Town terrace, spotted droppings under the kitchen sink in a Wroughton kitchen, or noticed a stale ammonia smell in a Highworth loft - you may have a rat problem.
Rats are one of the most common pest callouts across Swindon, and they're easy to ignore in the early stages. By the time most homeowners call a professional pest control Swindon company, the infestation has usually been building for weeks. That's a shame, because rats are far easier and cheaper to deal with when caught early.
This guide walks through the 8 most reliable signs of a rat infestation, what they mean, and what to do if you spot them in your Swindon property.
Rat droppings are the single most reliable indicator of an active infestation. Brown rats - the species behind almost all UK rat problems - produce around 40 droppings per night, so once they're established in a property, you won't have to look hard to find evidence.
What rat droppings look like:
Where to check first in a Swindon home:
If you find a mix of fresh shiny droppings and older grey ones, you've likely had rats for several weeks at least.
Rats are mostly nocturnal, so the first thing many Swindon homeowners notice isn't a sight - it's a sound. Listen for:
In older Swindon homes with suspended timber floors - common across Old Town, Gorse Hill and the railway-era terraces - noise travels easily along joists. You may hear a rat moving above a ceiling that's actually two rooms away.
If you can hear scratching during the daytime, it usually means either a heavy infestation (rats are competing for limited space and forced out during daylight) or that something has disturbed them.
A rat's front teeth grow continuously, so they have to gnaw constantly to wear them down. They'll chew through almost anything softer than their teeth - including wood, plastic pipes, soft mortar and electrical cables.
Where to look:
Rats have poor eyesight and tend to follow the same routes around a property, hugging walls and skirting boards. Their fur is naturally greasy, and over time this leaves dark smudges on the surfaces they brush against.
What to look for:
These rub marks are particularly useful evidence because they reveal the rat's "runways" - the routes it uses every night. Knowing the runways helps a pest controller place bait stations exactly where they'll be most effective.
Rat urine has a distinctive, strong ammonia smell. In a small infestation you may not notice it, but in larger or longer-standing infestations the smell becomes unmistakable - particularly in confined spaces like under-stairs cupboards, lofts and cellars.
If a room in your home suddenly develops a stale or "off" smell with no obvious cause - and especially if it smells like urine or ammonia - check for the other signs in this list. The smell often lingers in soft furnishings and insulation even after the rats have been removed, so don't ignore it.
Rats nest in quiet, undisturbed spaces. They shred whatever soft material is to hand - loft insulation, cardboard, paper, fabric, plant matter - and build loose, untidy clusters.
Common nesting spots in Swindon properties:
If you find a nest, don't touch it directly - rat nests can carry leptospirosis (Weil's disease), Salmonella and other pathogens. Photograph it, note the location, and let a professional handle removal as part of the treatment.
The brown rat is a natural burrower. In larger Swindon gardens - particularly in rural-fringe areas like Wroughton, Chiseldon, Wanborough and the SN6 villages - burrows are often the first sign of activity, well before any rats enter the house.
What a rat burrow looks like:
Rats burrowing in a garden are not yet in the house - but they will be, eventually. Treating outdoor rat activity early is one of the best ways to prevent an indoor infestation.
Cats and dogs often detect rats long before humans do. If your pet has started:
…it's worth investigating. Pet behaviour alone isn't proof - but combined with any of the other signs in this list, it's strong evidence.
The single biggest mistake homeowners make is waiting. Rats breed quickly: a single pair can theoretically produce up to 2,000 descendants in a year under ideal conditions, and although real-world infestations are smaller than that, populations grow fast enough that delaying treatment by a few weeks can double the cost and difficulty of resolving it.
Here's the right sequence of steps:
1. Don't try to fix it with shop-bought poison. DIY rodenticides from B&Q or Wilko are weaker than professional products, and using them without a proper inspection often just moves the rats elsewhere in the property - or kills one rat behind a wall cavity, leaving a smell that lasts months.
2. Take photos of the evidence. Droppings, gnaw marks, rub marks, nests. This helps the pest controller assess severity remotely and arrive with the right equipment.
3. Reduce attractants temporarily. Move pet food to sealed containers, take bird feeders down, secure compost bins. This won't solve the problem, but it slows the population's expansion.
4. Call a professional. A proper pest control inspection will identify how the rats are getting in (often via broken drains, gaps in airbricks, or holes around utility pipes - all common in older Swindon housing stock), treat the infestation, and proof the property so it doesn't happen again.
Wiltshire Council does not operate a pest control service for Swindon residents, so private pest controllers are the only option for most homeowners. Look for technicians who hold the RSPH Level 2 Award in Pest Management and who are members of the British Pest Control Association (BPCA) - those are the marks of a properly qualified service.
If you're seeing any of the signs in this guide and want a professional assessment, our Swindon pest control service covers all SN postcodes with same-day response where possible. You can also read our detailed rat treatment process to see exactly how we work.