The beech marten is a protected mammal, not a rodent you trap or poison. Two areas take the brunt of the damage: the attic, where it settles to sleep during the day, and the engine bay, where it severs cables and hoses at night.
Recognising beech marten droppings
Beech marten droppings are 8-10cm, twisted, often left in a small pile at the same spot (a fixed 'latrine') — unlike a rat, which scatters droppings along its travel routes.
Strong, musky smell, sometimes with visible remains (fur, fruit or bone fragments depending on diet). Typically found up high: roof beam edge, attic corner, under roofing.
Don't confuse it with rat droppings (smaller, tapered, scattered) or pine marten droppings (very similar visually — see below).
Beech marten, pine marten or weasel: telling them apart
The beech marten (Martes foina) has an irregular white throat patch and lives near homes. The pine marten (Martes martes) has a yellow-orange throat patch and stays mostly in forests — the two are easily confused in searches, but only the beech marten commonly settles in Belgian urban attics.
The weasel is noticeably smaller (20-25cm vs 40-50cm for the beech marten), with a very slim body. It doesn't attack vehicles and doesn't settle in attics the same way.
Under the bonnet: why beech martens attack cars
The beech marten marks territory by scent and picks up the smell of another marten (or a rival) on the cables and hoses of a still-warm engine — it bites to mark territory or out of territorial reflex, not to feed.
The damage (brake hoses, electronic wiring) often costs several hundred euros in repairs, rarely covered by standard car insurance.
Solutions that reduce the risk: clean scent markings under the bonnet after a suspected intrusion, fit protective sleeves on exposed cables, park in an enclosed space where possible, and install an ultrasonic device under the bonnet in high-pressure areas.
None of these solutions is 100% guaranteed alone — combining cleaning, physical protection and a repellent remains the most reliable approach.
In the attic: noises, insulation damage, prey stashes
Running and scratching noises at night, especially at dusk and dawn — the beech marten is noticeably noisier than a rodent and moves at height, in the roof structure.
Insulation can be compacted or soiled by repeated passage, and prey remains (birds, small rodents) sometimes accumulate in a corner used as a larder.
A 5-6cm opening is enough for an adult beech marten to get through — locating every potential access point (roof junctions, vents, gutters) is the first step before any intervention.
Trap, poison, repellent: what's legal and what isn't
The beech marten is protected under Belgian law of 12 July 1973. Trapping or killing one is illegal without a specific regional exemption — a trap or poison, even sold over the counter, exposes you to penalties and solves nothing: another beech marten takes the vacant spot within weeks.
Ultrasonic repellents and mothballs (naphthalene) can discourage a beech marten from settling, with the same limits as for any rodent: possible habituation, range limited by obstacles. Useful as a complement, never as a sole solution.
The only legal, lasting method is exclusion: seal every identified access point once the beech marten is confirmed absent (never while it's still inside, at risk of trapping it in), then secure the building durably.
When to call a professional
As soon as noises persist over several nights, vehicle damage recurs despite repellents, or before sealing any access — a beech marten still present inside would end up trapped, with far worse smell and sanitary consequences.
Antinox locates every entry point, confirms the animal's absence before sealing, and installs a lasting deterrence setup, in compliance with the species' protected status.
Frequently asked questions
Can I trap or kill a beech marten myself?
No. The beech marten is protected under Belgian law of 12 July 1973. Only exclusion (sealing access points after confirming the animal has left) is legal.
How do I tell beech marten droppings from rat droppings?
Beech marten droppings are larger (8-10cm), twisted, left in a fixed pile and often found up high. Rat droppings are smaller, tapered, and scattered along travel routes.
Does car insurance cover beech marten damage?
Rarely under standard coverage. Some comprehensive policies or specific rodent/pest options may include it — check with your insurer case by case.