New data from Rentokil has confirmed what many Northern Ireland homeowners already suspected: rat activity in the region has surged by 20% — the highest spike anywhere in the UK. As reported by The Irish News, the figures show a 10% increase in confirmed rodent activity UK-wide, but Northern Ireland is bearing the brunt of the problem.
Other hard-hit regions include the North West of England (19% increase), the West Midlands (16%), and Scotland (14%). The pattern is clear: this is not a local anomaly. It is a national trend — and climate change is at the heart of it.
Why Climate Change Means More Rats
The connection between warmer winters and rat populations is straightforward. In a typical cold British winter, a significant proportion of juvenile rats die from exposure and food scarcity. That natural cull keeps populations in check.
But 2025 was the warmest year on record globally, and UK winters have been getting milder for decades. The result: more rats survive the winter, breeding starts earlier in spring, and populations are larger by the time they peak in summer and autumn.
Wet weather compounds the problem. Heavy rainfall saturates burrow networks and drives rats above ground — and towards buildings. If your property offers warmth, shelter, and food, rats displaced by flooding or waterlogged ground will find their way in.
Why Northern Ireland Is Worst Hit
Northern Ireland's climate — mild, wet, and rarely experiencing the kind of hard frosts that kill rats — makes it particularly hospitable for rodents. Combined with a high proportion of rural and semi-rural properties (often near farms, outbuildings, and watercourses), the region offers ideal conditions for rat populations to thrive.
Urban areas like Belfast are not immune. Older housing stock, combined drainage systems, and dense residential areas all contribute to rat pressure in the city.
What Northern Ireland Homeowners Should Do
- Inspect your property now: Check around foundations, outbuildings, sheds, and garages for burrow holes (typically 6–9cm diameter). Look for droppings, gnaw marks, and grease smears along walls.
- Secure food sources: This means bird feeders, compost bins, pet food, stored animal feed, and unsecured household waste. If rats have a food source, they will stay.
- Proof outbuildings: Sheds, garages, and garden stores are often the first point of entry. Our shed pest-proofing guide covers the key steps.
- Deploy traps or rat bait stations: Rat traps and garden-rated bait stations placed along boundaries and known runs are the most effective DIY measures.
- Call a professional early: Do not wait until the problem is severe. A professional survey can identify the source, treat the active infestation, and proof your property against reentry.
For a complete treatment approach, see our comprehensive rat removal guide.
Belfast Residents
If you are in the Belfast area and need a pest controller, browse our Belfast pest control directory to find verified local professionals.
Elsewhere in the UK? Find a pest controller near you on PestPro Index.