What Are the UK Laws on Trapping Grey Squirrels?

Why Is It Illegal to Release a Grey Squirrel?

We speak to homeowners every week who have bought a wire cage trap online after hearing loud scratching and rolling noises above their bedroom ceiling at dawn. They catch the squirrel, put a towel over the cage, and then ring us asking where they are allowed to let it go. Unfortunately, the law leaves zero wiggle room here.

Grey squirrels (Sciurus carolinensis) are not native to the UK. They were introduced from North America in the 19th century and are classified as an invasive non-native species. They carry squirrelpox virus—which is harmless to greys but fatal to our native red squirrels—and they strip the bark off native broadleaf trees across Lancashire woodland.

Because of the damage they cause, Schedule 9 of the Wildlife and Countryside Act 1981 and the Invasive Alien Species (Enforcement and Permitting) Order 2019 make it an offence to release a grey squirrel, or allow one to escape into the wild, once it is under your control. The moment that cage door snaps shut in your loft, the squirrel is legally in your custody. You cannot let it out in the garden, and you cannot drive it out to country lanes around the Ribble Valley or Clitheroe to release it.

Rules on Spring Traps and Humane Dispatch

When our technicians clear a squirrel issue from a domestic loft, we rarely use live cages unless there is a very specific reason to do so. Instead, we use professional, heavy-duty mechanical spring traps (such as Fenn Mk4 orMk6, BMI Magnum, or Kania traps) that are specifically tested and listed under the Spring Traps Approval Orders.

Standard rat snap traps bought from a hardware shop are not strong enough for grey squirrels. Using an underpowered rat trap on an adult squirrel will likely maim the animal rather than kill it cleanly, leaving you with an injured, distressed squirrel thrashing around in your loft insulation—and potentially putting you in breach of welfare laws.

On the job, we set approved high-powered spring traps inside locked or baffled wooden and metal tunnels, or secure them directly along the timber wall plates where squirrels run. We wear protective overshoes in your home, lay dust sheets below the loft hatch, pull back the fibreglass insulation carefully with a rake, and anchor the trap boxes so they cannot be dragged if knocked. All carcasses are removed and disposed of legally off-site.

Why Are Poisons Rarely Used for Squirrels in Houses?

Customers often ask why we cannot just put down bait trays like we sometimes do for mice. First, indoor anticoagulant rodenticides approved for grey squirrels are heavily restricted under UK Health and Safety Executive (HSE) and CRRU (Campaign for Responsible Rodenticide Use) rules to protect non-target wildlife like owls and kestrels from secondary poisoning.

Second, from a practical tradesman's perspective, poisoning squirrels in a domestic roof space is a terrible idea. A squirrel weighs up to 600 grams—much heavier than a house mouse. If a squirrel eats poison and dies inside an inaccessible dormer void, wall cavity, or beneath tongue-and-groove loft boarding, the smell of decay will permeate your bedrooms for weeks, followed by a heavy blowfly infestation. Physical trapping means we account for every single animal and take it away in our van.

Checking for Protected Bats Before Loft Work

Before we set a single trap or screw a piece of galvanised steel mesh over a rotten fascia board, we have to inspect the loft with high-powered torches for bats. In the UK, all bat species and their roosts are strictly protected under the Wildlife and Countryside Act 1981 and the Conservation of Habitats and Species Regulations 2017.

It is an offence to intentionally or recklessly kill, injure, or disturb a bat, or to block access to its roost—even if the bats are not currently inside the roof at that time of year. We see bats regularly across Lancashire, particularly in rural stone cottages, barn conversions, and older properties with slate roofs.

During our initial survey, we check the ridge beams, mortise joints, and felt linings for clusters of bats or bat droppings. Bat droppings look similar to mouse droppings at a glance, but when rubbed between gloved fingers, bat droppings crumble into a fine, shiny dust made of insect wing cases, whereas rodent droppings stay hard. If we find an active bat roost, we have to follow Natural England guidance before any invasive pest work or roofline sealing takes place.

What to Expect When You Call Us In

A standard squirrel eradication and proofing job usually takes two to three visits over the course of a week to ten days. On visit one, we inspect the loft for chewed 13A electrical cables, stripped insulation, dreys, and bat activity, locate the external entry point from the ground or off our ladders, and set baited spring traps inside the roof space.

On follow-up visits, we check the traps, remove any caught squirrels, and monitor for fresh activity. Once the traps stay untouched and we are certain no squirrels are left inside (especially checking for dependent young during spring and summer litters), we lock down the entry points with metal mesh or install downpipe climbing baffles so nothing can get back in.