Domakihub How to Deter Stone Martens from Your Home for Good
Stop marten damage before it costs you a roof repair or a rewired attic.
Reviewed by Domakihub home & decor pros · 2026-06-23 · 5 min read
Stone martens (Martes foina) are common across mainland Greece and the islands, slipping into roof spaces, attics, and crawl spaces in search of warm nesting spots — especially in older villas, holiday rentals, and stone farmhouses. Left unchecked, they shred insulation, gnaw on wiring, and leave behind droppings that create persistent odour and hygiene problems. The video above walks through the core roof-access solution; this article spells out the full five-step approach so you can protect your property and keep martens from returning season after season.
Why Stone Martens Target Greek Homes
Stone martens are highly adaptable and thrive in exactly the kind of mixed urban-rural landscape found throughout Greece — olive groves edged by villages, hillside hotels, and coastal rental properties. They are excellent climbers and can squeeze through gaps as small as 6 cm, making old stone walls and terracotta-tiled roofs particularly easy entry points. Activity peaks at night and increases during autumn when they seek warm nesting sites before cooler months arrive.
Martens are territorial animals. Once an individual has established a nesting route inside a building it will return night after night, and it will defend the route aggressively against rivals — meaning the pheromone trails left behind will attract the next marten even after the current resident has gone. This is why simple chasing rarely works; you have to eliminate the trail as well as the entry point.
The Real Cost of Ignoring the Problem
A single marten can destroy several square metres of glass-wool or spray-foam insulation in a matter of weeks. In rental properties and hotels this translates directly into energy bills climbing as the building's thermal envelope is compromised. More seriously, gnawed electrical cables in attic spaces are a documented fire risk — a concern that Greek insurers are increasingly flagging in property inspections.
Landlords and property managers in Greece have a duty of care to guests and tenants. Discovering a marten infestation during a peak tourist season can mean emergency call-outs, temporary loss of bookings, and costly last-minute repairs. Acting preventively at the start of spring — before the animals enter the nesting phase — is significantly cheaper than reactive intervention.
5 Steps to Deter Stone Martens from Your Property
- 1
Inspect and map every entry point
Walk the full perimeter of the building at ground level and from a ladder where safe, looking for gaps around roof-tile edges, ventilation gaps under eaves, broken soffit boards, and holes where pipes or cables pass through exterior walls. Mark every opening 6 cm or larger. A head-torch and a stick to probe suspicious gaps will help; martens leave dark, greasy smear marks and dark droppings at active entry points.
- 2
Seal gaps with marten-proof materials
Close identified openings with galvanised wire mesh (minimum 13 mm x 13 mm aperture, 1 mm wire gauge) fixed with corrosion-resistant staples or screws, then bed the mesh with exterior-grade mortar or expanding foam rated for rodent resistance. Ordinary foam alone is not sufficient — martens will chew through it. For terracotta-tile roofs, stainless-steel tile clips that press tiles flush to the batten eliminate the 5–8 cm gap that martens use as a highway along the eave line.
- 3
Remove and neutralise scent trails inside the attic
Once entry is sealed, enter the attic wearing gloves and a P2 dust mask. Remove all nesting material (straw, insulation scraps, feathers) and bag it for disposal. Scrub soiled surfaces with a disinfectant approved for animal waste, then apply a commercial marten-repellent spray — products based on predator urine or capsaicin are available at Greek agricultural supply shops and online. Reapply every four to six weeks during the first season. Skipping this step is the most common reason infestations recur.
- 4
Install ultrasonic or motion-activated deterrents
Place battery-powered ultrasonic emitters (20–55 kHz range) at the sealed entry points and in any accessible roof void. PIR-triggered units that combine ultrasound with a bright LED flash are more effective than ultrasound alone. Position devices so the beam faces the direction of approach — usually along the eave line or across a flat roof terrace. Check batteries monthly. These devices do not harm pets or humans and are legal throughout the EU, making them suitable for hotels and rental properties where chemicals may not be appropriate.
- 5
Eliminate attractants around the building
Martens are omnivores drawn by fruit trees, compost heaps, chicken coops, and ornamental fish ponds. Harvest fallen fruit promptly, move compost bins at least 10 m from the building, and protect chicken runs with hardware cloth buried 30 cm into the ground. Dense climbing plants such as ivy and bougainvillea against walls give martens an easy ladder to higher entry points — trim stems back at least 1 m from the roofline. Repeat a full perimeter check each spring before nesting season begins in April.
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FAQ
- Is it legal to trap or kill stone martens in Greece?
- Stone martens are protected under Greek wildlife law (implementing EU Habitats Directive Annex V). Lethal control requires a derogation permit from the Hellenic Ministry of Environment and is rarely granted for residential cases. Live-trapping and relocation is permitted but the animal must be released at an appropriate distance in suitable habitat. In practice, exclusion and deterrence is both the legal and the most effective long-term strategy.
- How do I know if the marten has left before I seal the gaps?
- Spread a thin layer of flour or fine sand across the confirmed entry point on the inside at dusk, then check it at dawn for the next three nights. No tracks after three consecutive nights is a reliable sign the animal is no longer using that route. You can also watch the opening from a distance for 30 minutes at dusk, which is peak marten activity time. Seal only once you are confident the animal is outside.
- Will the marten come back after I seal the entry?
- A marten excluded from its established territory will attempt to re-enter for several weeks and may probe other weak points in the building envelope. The combination of thorough sealing, scent-trail removal, and active deterrents (ultrasonic emitters) reduces re-entry significantly. Expect to do a follow-up inspection 30 days after sealing and again at the start of the following autumn nesting season.