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Grey squirrels are a familiar sight in many UK gardens and smallholdings, but they are also an invasive non-native species. If you're considering trapping them, it's essential to understand the legal landscape. This isn't about red tape for its own sake — it's about protecting our native wildlife, avoiding unnecessary suffering, and keeping you on the right side of the law.

Why Grey Squirrels Are a Special Case

Grey squirrels (Sciurus carolinensis) were introduced to the UK in the 19th century. They are now widespread, but their presence has a serious impact on native red squirrels and woodland health. Under the Invasive Alien Species (Enforcement and Permitting) Order 2019, it is an offence to release a grey squirrel into the wild or to allow one to escape. This means that once you have trapped a grey squirrel, you cannot simply release it elsewhere. You must dispatch it humanely. This is the single most important legal point to grasp before setting any trap.

The Rules on Trapping: What You Can and Can't Do

Trapping on your own land is generally permitted, but the methods you use are strictly regulated. Live-catch cage traps are legal and widely used. If you opt for a spring trap, it must be one approved for grey squirrels under the Spring Traps Approval Order, and it must be set within a tunnel to reduce the risk to non-target species. Glue traps and snares are not acceptable for squirrels — they cause unacceptable suffering and may be illegal.

You also have a legal duty of care under the Animal Welfare Act 2006. This means you must check your traps at least once every 24 hours, but in practice, checking every few hours is far better. A trapped squirrel is vulnerable to stress, injury and predation. The longer it is left, the greater the suffering — and the greater your legal risk.

Humane Dispatch: Your Legal and Moral Duty

Because you cannot release a grey squirrel, you must be prepared to dispatch it humanely and quickly. Acceptable methods include a single shot to the head from a suitable air rifle or firearm, or a sharp blow to the back of the head with a heavy, blunt object — but only if you are trained and confident. Drowning is illegal and cruel. Poison is not licensed for grey squirrels and must never be used.

If you are unsure about dispatch, or if you catch a squirrel and cannot deal with it yourself, contact a professional pest controller or your vet. Some vets will euthanise a trapped squirrel, though a fee may apply. Always have a plan in place before you set a trap. Winging it is not fair on the animal and could land you in trouble.

Protected Species Checks: Avoiding Accidental Catches

Before you set any trap, you must consider whether protected species might be present. Red squirrels, pine martens, dormice, and various birds are all protected by law. If you trap one of these by accident, you must release it immediately (if it is unharmed) or take it to a vet or licensed rehabilitator. Causing harm to a protected species can result in an unlimited fine and up to six months in prison.

In red squirrel strongholds — such as parts of Scotland, the Lake District, and North Wales — extra care is needed. Use selective traps that exclude larger animals, and set them in areas where reds are unlikely to forage. If you are unsure, ask your local wildlife trust or the relevant statutory body for advice.

Licences and Permissions: When You Might Need One

For most homeowners and smallholders trapping grey squirrels on their own property, no licence is required. However, there are exceptions. If you plan to use a spring trap that is not approved for squirrels, or if you are trapping on a Site of Special Scientific Interest (SSSI), you may need a licence from Natural England, Natural Resources Wales, or NatureScot. Commercial pest controllers may also need to demonstrate competence.

If you are trapping as part of a community or smallholding effort, check whether any local byelaws apply. And remember: if you are unsure, always ask. A quick call to the relevant authority can save you a lot of trouble later.

Practical Tips for Homes, Gardens and Smallholdings

• Choose the right trap. A live-catch cage trap is the most straightforward and humane option for most situations. Set it in a sheltered spot, away from pets and children.
• Use a tunnel. If using a spring trap, always place it inside a wooden or plastic tunnel to prevent catching birds, hedgehogs or other wildlife.
• Check frequently. Aim to check traps every two to four hours during daylight. Never leave a trap set overnight if you cannot check it early the next morning.
• Have a dispatch plan. Know exactly how you will dispatch a trapped squirrel before you start. If you cannot do it yourself, have a contact ready.
• Keep records. Note dates, locations and outcomes. This helps you refine your approach and demonstrates due diligence.
• Work with neighbours. Squirrels travel. A coordinated approach across gardens or a smallholding is far more effective than isolated trapping.

Trapping grey squirrels is a serious undertaking. Done legally and humanely, it can help protect native wildlife and reduce damage. Done carelessly, it can cause suffering and lead to prosecution. Take the time to get it right.