Grey Squirrel Control: Legal Methods and Professional Solutions

The Legal Position on Grey Squirrel Control in the UK

The grey squirrel (Sciurus carolinensis) is listed on Schedule 9 of the Wildlife and Countryside Act 1981 as an invasive non-native species. It is a criminal offence to release a grey squirrel into the wild or to allow a captured grey squirrel to escape. This has a critical practical implication: if you cage-trap a grey squirrel, you cannot release it elsewhere. It must be humanely killed on site. This applies to any person, not just pest controllers. The legislation exists because grey squirrels outcompete and displace native red squirrels (Sciurus vulgaris) — now restricted to approximately 300,000 individuals in Scotland, parts of northern England and Northern Ireland — and carry squirrelpox virus, which is lethal to red squirrels but causes no harm to grey squirrels.

The grey squirrel population in the UK is estimated at approximately 2.7 million. The species was introduced from North America in the 1870s and is now established across virtually all of England, Wales and lowland Scotland.

— Forestry Commission; Natural England

The Damage Grey Squirrels Cause

Grey squirrels are among the most destructive rodent pests in UK buildings and gardens. Their incisors grow continuously — they gnaw constantly to wear them down — and in loft spaces they target electrical cables, water pipes, timber joists, insulation materials and stored items. Gnawed electrical cables are a significant fire risk. Water pipe damage can cause internal flooding. Structural timber damage is expensive to repair and may affect the integrity of roof supports if left long-term.

Loft Infestations

A grey squirrel in the loft is one of the most common squirrel pest problems in UK urban and suburban properties. Entry is typically through defects in the roofline: damaged fascia boards, gaps where the roof meets the eaves, open ridge tiles, and gaps around cables or pipes entering the loft space. Once inside, squirrels nest using insulation material, gnaw at timber and cables, and produce droppings and urine that contaminate the loft. Squirrels may enter and exit repeatedly — they do not permanently occupy a loft in the way a bird would — but each visit causes damage and the nesting material accumulates.

Garden and Woodland Damage

In gardens and woodland, grey squirrels strip bark from young trees — particularly sycamore, beech and oak — by gnawing through the outer bark to feed on the sap layer beneath. This ring-barking can kill a young tree within a season. Grey squirrels also predate bird eggs and nestlings, competing with native woodland bird species, and consume significant quantities of tree seeds and nuts, reducing natural regeneration of woodland.

Legal Grey Squirrel Control Methods

Professional grey squirrel control uses three main methods — all of which comply with the Wildlife and Countryside Act 1981 and the Animal Welfare Act 2006 requirements for humane treatment.

Cage Trapping

Live cage traps (approved designs such as the Perdix Multi-Catch or single-catch cage traps) are baited with maize or other attractants and placed on squirrel runs, at entry points or near feeding areas. Traps must be checked at least once every 24 hours as required by the Animal Welfare Act 2006. Captured grey squirrels must be humanely killed immediately — they cannot be released. The most common methods of humane dispatch used by pest controllers are a swift blow to the back of the skull or a CO₂ chamber. Traps are cleaned and rebaited after each capture. A sustained trapping programme over 4–6 weeks is typically required to clear an established population from a building or area.

Spring Traps in Approved Tunnels

Spring traps approved for grey squirrel control include the Fenn Mk4 and Mk6, the Kania 2000 and other traps on the approved list under the Spring Traps Approval Order (England) 2018. These must be set inside a tunnel of specified dimensions (to prevent access by non-target species) and positioned on known squirrel runs — along fence tops, in the crotch of trees, or at entry points to loft spaces. Approved spring traps kill instantly and humanely. They require less frequent inspection than cage traps but must still be checked regularly.

Shooting

Grey squirrels may be shot under open general licence as an invasive non-native species. An appropriate firearm and permission from the landowner are required. Shooting is most effective in woodland settings and less practical for loft or building infestations. It is commonly used in combination with trapping as part of a wider landscape-level control programme.

Professional Control of Squirrels in Lofts

Getting squirrels out of a loft and keeping them out requires two things: trapping or excluding the current occupants, and proofing the entry points. A professional squirrel control programme for a loft infestation includes: a survey to identify all entry points and confirm squirrel occupancy (not bats or birds, which have separate legal protections); cage or spring trapping to catch and dispatch the resident squirrels; proofing of all entry points with heavy-gauge wire mesh, metal flashing or solid repair of damaged structural elements; and a follow-up visit to confirm no re-entry. Loft proofing against squirrels requires robust materials — they can gnaw through timber, standard wire mesh and plastic without difficulty. Heavy-gauge galvanised or stainless steel mesh (minimum 25 mm × 25 mm) is the appropriate specification.

When to Call a Professional

If you can hear scratching, scrabbling or gnawing sounds from your loft, particularly during the day (squirrels are diurnal), or if you have found squirrel droppings (15–20 mm, similar to rat droppings but drier and more irregular), you should arrange a professional inspection promptly. Early intervention — before the squirrel has been resident long enough to cause significant cable or structural damage — reduces repair costs substantially. Professional pest controllers can also carry out a bat survey check before beginning loft work, as bats and their roosts are fully protected under the Conservation of Habitats and Species Regulations 2017 and the Wildlife and Countryside Act 1981.

These grey squirrel guides may also be worth reading: grey squirrel pest control, get rid of grey squirrels, squirrels in the attic, and squirrel pest control.

Frequently Asked Questions

Is it illegal to release a grey squirrel in the UK?

Yes. The grey squirrel (Sciurus carolinensis) is listed on Schedule 9 of the Wildlife and Countryside Act 1981 as an invasive non-native species. It is a criminal offence to release a grey squirrel or allow a captured grey squirrel to escape into the wild.

This applies to all persons — not just pest controllers. If you cage-trap a grey squirrel, you are legally required to humanely kill it. You cannot transport it to a park, woodland or anywhere else and release it.

The penalty for an offence under Schedule 9 includes an unlimited fine and up to 6 months' imprisonment.

What damage can grey squirrels cause in a loft?

Grey squirrels in a loft gnaw electrical cables (creating fire risk), water pipes (creating flood risk), structural timbers including joists and rafters, and roof insulation — using torn insulation material as nesting material. They also contaminate the loft with droppings and urine. Even a single squirrel accessing a loft repeatedly can cause cable damage that requires an electrician before the electrics are safe to use.

A population of squirrels over a winter season can cause thousands of pounds of structural and electrical damage. Early professional intervention is significantly cheaper than delayed action.

Can I use a cage trap for grey squirrels myself?

Yes — householders can legally use live cage traps for grey squirrels without a licence, provided they comply with the Animal Welfare Act 2006 requirement to check traps at least once every 24 hours. The critical legal requirement is that any grey squirrel caught must be humanely killed immediately — it cannot be released. Approved methods of humane dispatch for most members of the public include a swift sharp blow to the back of the skull or CO₂ exposure.

Many householders prefer to engage a professional pest controller for this reason — the trapping and humane dispatch requirement is straightforward for an experienced technician.

Do grey squirrels carry diseases that affect humans in the UK?

Grey squirrels in the UK are not currently known to be a significant direct public health risk to humans through disease transmission. They carry squirrelpox virus (Squirrel parapoxvirus) which is lethal to red squirrels but causes no harm to grey squirrels or humans. Like all wild rodents, grey squirrels may carry leptospirosis and other zoonotic pathogens, but the risk of transmission to humans through normal pest control activity (without handling live animals or their urine with open wounds) is low.

Standard personal protective equipment — gloves and hand washing — is sufficient for most grey squirrel control activities.

How do grey squirrels get into a loft?

Grey squirrels enter loft spaces through gaps in the roofline — particularly damaged or rotting fascia boards and soffits, gaps where the roof structure meets the wall at the eaves, missing or loose ridge tiles, and openings around cables, pipes or aerials entering through the roof. Squirrels are agile climbers and can scale rough-textured walls, drainpipes, trees adjacent to the building, and neighbouring fences to reach roof level. They are persistent — once a squirrel has found a route into a warm, sheltered loft, it will return repeatedly.

Proofing requires heavy-gauge mesh or solid repair of all identified entry points, as squirrels can gnaw through standard wire mesh, timber and plastic.

What time of year are grey squirrels most active and most likely to enter buildings?

Grey squirrels have two peak activity periods in the UK corresponding to their two annual breeding seasons: late winter to spring (February–May, when the first litter is born) and late summer to autumn (August–November, when the second litter is born). They are diurnal — active during daylight hours — unlike most other rodent pests. Loft entry is most commonly detected in autumn (October–November), when squirrels seek warm sheltered locations ahead of winter.

Scratching and scrabbling sounds in the loft during daytime are a strong indicator of squirrel rather than rat or mouse activity.

Can grey squirrels be deterred without lethal control?

Deterrents such as ultrasonic devices, scent repellents and predator urine products have not been demonstrated to provide reliable long-term deterrence of grey squirrels in peer-reviewed evidence. Physical exclusion — proofing all entry points with heavy-gauge galvanised or stainless steel mesh before squirrels enter — is the most effective prevention strategy. Where squirrels have already established access, proofing alone (without removing the resident animals first) risks trapping squirrels inside, where they will cause significant damage.

Professional exclusion programmes therefore combine population reduction (trapping) with structural proofing in sequence.

Grey Squirrel Control in South Yorkshire

Apex Pest Control Ltd provides professional grey squirrel control across Sheffield, Leeds, Barnsley and Rotherham — including loft exclusion, cage trapping, spring trap programmes and entry point proofing. All work complies fully with the Wildlife and Countryside Act 1981.

Contact Apex Pest Control Ltd to arrange a grey squirrel assessment.