In the UK, the grey squirrel is the most common species to cause problems. Unlike the red squirrel, which is a protected species, the grey squirrel is considered invasive and can cause significant damage when they get in to a property.
While often seen as charming wildlife, grey squirrels can become pests when they nest in roof spaces or attics, chew through timbers, wiring, insulation or raid bird feeders.
Why grey squirrels are problematic
Grey squirrels are capable of causing extensive damage to properties if they can get into a home. They are known to chew through wood, insulation and even electrical wiring, which poses a serious fire risk. Inside a home, the grey squirrel can be heard scratching, gnawing or scampering in attics and wall cavities, particularly at dawn or dusk.
Their nesting behaviours can also be messy and destructive. They can build in insulation or among stored items in your home's attic. In gardens, they can dig up plant bulbs, damage young plants and raid bird feeders.
Signs of grey squirrels
- Noises in attics or walls.
- Disturbed or shredded insulation.
- Droppings and gnawed materials.
- Entry points to the home may be visible along the roofline or eaves.
- Outdoors, damaged or raided bird feeders.
Signs of gnawing on wooden structures or containers can also indicate squirrel activity.
Preventing problems
- Any entry points to the property should be repaired or sealed, especially around roof eaves, vents, chimneys and roof edges.
- Any trees with overhanging branches that reach towards the property should be trimmed back to prevent squirrels leaping onto the property.
- Bird feeders should be designed to be squirrel proof and overfeeding birds should be avoided. Food sources attract unwanted attention.
- Pet food and other attractants, such as bird feed, should be stored securely.
- Regular inspections of attics and sheds can help catch early signs of squirrel intrusion.
Seasonal squirrel activity
Grey squirrel activity tends to increase in autumn and early winter, as they seek out warm and sheltered spaces to build nests and store food in preparation for colder months. This is when they are most likely to invade attic and other roof spaces.
In spring, you may also notice more activity as females search for nesting sites to raise their young.
Understanding these seasonal patterns can help you know when to complete maintenance tasks, such as trimming tree branches. Remain vigilant during peak periods of squirrel activity.
Dealing with grey squirrels
In most cases, a squirrel can be scared away and any entrances to the property repaired before the squirrel returns. However, if this is not possible then a live trap may need to be setup.
It is illegal to release a grey squirrel back into the wild once it has been captured, due to them being an invasive species. Any live trapped squirrels must be humanely killed. Due to these legal obligations, please contact a professional.
Some repellents and deterrents, including ultrasonic devices and scent-based products, may provide limited relief. Their effectiveness can vary significantly.
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