About this guide
Getting rid of squirrels in the attic requires a specific sequence: survey to identify entry points and confirm occupancy, trapping to remove the resident squirrels, humane dispatch (it is illegal to release captured grey squirrels), and structural proofing of all entry points. This guide explains each stage, what the law requires, the damage squirrels cause in lofts, and why professional help is needed to do the job properly.
How Do Squirrels Get Into an Attic?
Grey squirrels access attics through defects in the roofline — areas where the roof structure meets the external walls or where gaps have developed around building components. The most common entry routes are: damaged or rotting fascia boards where the roofline meets the soffit, gaps where the roof tiles or slates meet the eaves, open or poorly sealed ridge tiles at the roof apex, gaps around cables, pipes and aerials entering through the roof covering, and areas where overhanging tree branches provide a direct route onto the roof. Squirrels are strong climbers — they ascend rough-textured render, drainpipes, timber cladding and garden structures easily. Once a squirrel finds an entry point it considers suitable — warm, sheltered and close to food sources — it returns repeatedly.
Grey squirrels are diurnal — active during daylight hours. Scratching and gnawing sounds from your attic during the day (not at night) are a strong indicator of squirrel activity rather than rats or mice, which are primarily nocturnal.
— BPCA Technical Manual
How to Tell If You Have Squirrels in the Attic
The main signs of squirrel activity in an attic are: audible scratching, scrabbling and gnawing during daylight hours (squirrels are diurnal — daytime noise is a key distinguishing feature from rats and mice); squirrel droppings in the loft (15–20 mm, similar to rat droppings but darker and more irregular in shape, often deposited in concentrated areas near the nest); gnaw marks on structural timber, electrical cables, water pipes and insulation; nest material — torn roof insulation, shredded paper or fabric, leaves and twigs — concentrated in a corner of the loft; and visual sightings of squirrels entering or exiting the roofline, or in the loft space itself when inspected with a torch.
Squirrel vs Rat vs Mouse in the Attic
Squirrel: noise during daytime, droppings 15–20 mm irregular, gnaw marks on structural timber and cables, nest material is bulky (insulation, twigs, leaves). Rat: noise primarily at night, droppings 15–20 mm blunt-ended capsule, gnaw marks often at floor level and around pipes. Mouse: noise at night, droppings 3–7 mm with pointed ends, gnaw marks small and at low level. If you are uncertain, a professional inspection confirms the species from the evidence pattern.
Step 1 — Professional Survey and Bat Assessment
Before any trapping or proofing begins, a professional pest controller inspects the loft space and roofline to: confirm squirrel occupancy (evidence of activity, nest location, entry points identified); map all entry routes with photographs; assess the extent of damage to cables, timber and insulation; and carry out a bat assessment. Bat assessment is a standard professional requirement before loft exclusion work — all UK bat species and their roosts are fully protected under the Conservation of Habitats and Species Regulations 2017. If bats are confirmed or suspected, a licensed bat surveyor must be engaged before proofing proceeds. An inadvertent bat roost disturbance is a criminal offence carrying an unlimited fine.
Step 2 — Cage Trapping and Humane Dispatch
Once the survey is complete and any bat issues resolved, cage traps are deployed at entry points, along the roofline outside, in the loft space if suitable, and on known garden runs used by the squirrels to access the building. The most effective loft trap positioning is at or immediately adjacent to the identified entry point — squirrels will be caught entering or leaving. All cage traps must be checked at least once every 24 hours. Every captured grey squirrel must be humanely dispatched immediately — it is a criminal offence under the Wildlife and Countryside Act 1981 to release a live-caught grey squirrel into the wild. The technician carries out humane dispatch at each trap check visit.
Trap baiting uses whole maize (sweetcorn), which is highly attractive to grey squirrels and has minimal attraction to non-target species such as birds. Traps are cleaned and rebaited after each capture. A full attic clearance programme typically requires 3–6 weeks of trapping with visits at least every 24–48 hours. The trapping programme continues until no squirrels are caught over a sustained monitoring period.
Spring Traps as an Alternative
Approved spring traps — Fenn Mk4, Fenn Mk6, Kania 2000 — can be set inside tunnels placed at entry points or on known runs. They kill instantly and humanely, require less frequent inspection than cage traps, and are effective at entry points where consistent squirrel traffic is confirmed. In a loft space, spring traps set in tunnels at the entry point can be particularly effective, combining trapping with an element of structural barrier at the access location.
Do Not Proof Before Trapping — Proofing entry points before the resident squirrels have been cleared risks trapping squirrels inside the loft. A squirrel sealed inside a building with no exit will cause significant additional damage — gnawing frantically at timber, cables and the roof structure — before it dies. The correct sequence is always: trap and remove all resident squirrels first, then proof the entry points with the building confirmed empty.
Step 3 — Structural Proofing of Entry Points
After the trapping programme confirms the loft is clear, all identified entry points are proofed with robust materials. Standard proofing materials for squirrel exclusion include heavy-gauge galvanised or stainless steel mesh (minimum 25 mm × 25 mm aperture, securely fixed with screws or staples into timber — not just pressed into place); solid timber or metal repair of damaged fascia and soffit boards; metal flashing over gaps in roof junctions; and appropriate sealants around cable and pipe entry points. Squirrels can gnaw through timber, standard plastic, foam and thin wire mesh — only heavy-gauge steel mesh or solid repair adequately excludes them.
Step 4 — Monitoring and Written Confirmation
After proofing is complete, a monitoring visit confirms no re-entry has occurred through the proofed points and that no squirrels remain inside. The pest controller inspects the loft space and external roofline and issues a written report confirming the building is clear and the entry points are sealed. This written confirmation is important documentation for property owners — particularly for insurance purposes where cable or structural damage has occurred, or for landlords where squirrel infestation relates to a rental property.
The Damage of Delaying Squirrel Attic Treatment
Squirrel damage in an attic accumulates continuously. A single squirrel returning to a loft over a winter — gnawing cables and nesting in insulation — can cause electrical faults requiring a qualified electrician to survey and replace damaged wiring before the property is safe. Structural timber damage to joists and rafters may require a carpenter or structural engineer assessment. The longer a squirrel infestation runs untreated, the higher the total remediation cost. Early professional intervention — at the first sound of daytime scratching in the loft — is invariably the most cost-effective response.
Frequently Asked Questions
Is it safe to go into the attic if squirrels are present?
Yes, with appropriate precautions. Grey squirrels are not aggressive towards humans in normal circumstances and will retreat if disturbed. Wear thick gloves in case of contact with a cornered individual.
The main health precaution when entering a squirrel-infested loft is respiratory protection during any disturbance of accumulated droppings or nest material — a basic dust mask or FFP2 respirator is appropriate for a brief inspection. Do not spend extended time in a heavily contaminated loft without proper RPE. The principal hazard is not the squirrel itself but the state of cables — a torch inspection to assess cable condition before any work begins is a sensible precaution.
Can squirrels in the attic cause a fire?
Yes. Grey squirrels gnaw continuously to wear down their constantly growing incisors and are not selective about what they gnaw. Electrical cables in loft spaces — mains wiring, lighting circuits, alarm cables and data cables — are frequently gnawed by squirrels.
Damaged cable insulation creates a risk of short-circuit, arcing and ignition of adjacent insulation material or timber. Rodent gnawing has been identified by fire investigators as a contributory factor in a significant proportion of domestic electrical fires in the UK where no other obvious cause is established. A professional electrician should survey cable condition in the loft after any squirrel infestation before the electrical installation is signed off as safe.
Do I need a bat survey before proofing my roof for squirrels?
Yes — a bat assessment is a standard professional requirement before any structural exclusion or proofing work to loft or roof spaces. All UK bat species and their roosts are fully protected under the Conservation of Habitats and Species Regulations 2017 and the Wildlife and Countryside Act 1981. It is a criminal offence to disturb a bat roost even when not occupied by bats, without a licence from Natural England.
A bat assessment does not necessarily require a full ecological survey — many loft spaces can be assessed by a competent professional as part of the squirrel survey. If bats are confirmed or suspected, a licensed bat surveyor is engaged before proofing proceeds.
Can squirrels nest in the attic insulation?
Yes. Loft insulation — both mineral wool and rigid insulation board — is frequently used by grey squirrels as nesting material. Squirrels shred and displace the insulation to create a drey (nest), concentrating material into a large, bulky nest structure, often in a corner of the loft.
The nest and the surrounding area will be contaminated with droppings and urine. Displaced or compressed insulation loses its thermal efficiency, so damaged insulation may need to be replaced after the squirrel infestation has been cleared and proofing completed. A professional assessment after clearance includes a recommendation on insulation condition.
What is the best bait for squirrel cage traps?
Whole maize (dried sweetcorn) is the most effective and widely used bait for grey squirrel cage traps in professional pest control. It is highly attractive to grey squirrels, relatively unattractive to non-target species such as birds compared to peanuts, and does not deteriorate rapidly in the trap. Some professionals use hazelnuts, peanuts or peanut butter in specific circumstances, particularly in autumn and early winter when squirrels are actively caching protein-rich food.
Traps should be baited with a small amount of attractant placed at the back of the trap, drawing the squirrel fully inside before triggering the mechanism.
How much does squirrel control in a loft cost in the UK?
Professional squirrel control costs vary depending on the scale of the infestation, the number of trap check visits required, whether proofing materials and installation are included, and the property size and access complexity. A typical residential loft squirrel programme across South Yorkshire includes an initial survey visit, 3–6 weeks of trapping with regular trap checks, a proofing survey report, proofing installation, and a written discharge confirmation. Apex Pest Control Ltd provides a site-specific quote following the initial survey — contact us for a no-obligation assessment across Sheffield, Leeds, Barnsley and Rotherham.
Can squirrels come back after the attic has been proofed?
Correctly installed heavy-gauge galvanised steel mesh proofing prevents re-entry as long as it remains structurally sound and all entry points have been addressed. Squirrels can return if: a proofing repair is incomplete (a gap has been missed); structural deterioration creates a new entry point elsewhere in the roofline (rotting fascia boards, slipped tiles); or overhanging trees give squirrels direct roof access that they use to investigate for new entry points. An annual autumn inspection — squirrel activity around buildings peaks in autumn as food availability declines — allows early detection of any renewed access attempts before damage accumulates.
Get Rid of Squirrels in Your Attic — South Yorkshire
Apex Pest Control Ltd removes squirrels from attics and loft spaces across Sheffield, Leeds, Barnsley and Rotherham. All work includes a survey, cage or spring trap programme, humane dispatch, bat assessment and written structural proofing recommendations.
Contact Apex Pest Control Ltd for a squirrel inspection.