Japanese houses are built of timber, often on stone or low concrete foundations, in a humid climate — ideal conditions for termites (シロアリ). An empty house is especially at risk because no one notices the early signs.
Two species to know
- Japanese subterranean termite (ヤマトシロアリ) — found across most of Japan. Swarms on warm days around April and May.
- Formosan subterranean termite (イエシロアリ) — in warmer coastal areas of western and southern Japan. Larger colonies, faster damage; swarms on early-summer evenings.
Warning signs
- Swarms of winged insects indoors in spring or early summer
- Mud tubes running up foundations or posts
- Floors that feel soft or bounce, especially near the bathroom and kitchen
- Timber that sounds hollow when tapped
Treatment and warranties
Treatment usually means chemical barriers applied under the floor and to the lower timbers, or bait systems around the house. Professional treatments in Japan commonly come with a warranty of around five years, after which re-treatment is recommended. A full treatment for a house often starts around ¥100,000, more for larger or badly affected homes — see typical costs on our pricing page.
Prevention
Keep the under-floor space ventilated and dry, fix leaks quickly, keep firewood and timber away from the walls, and have the house inspected every year or two. For homes in our care we check for termite signs on every visit and coordinate treatment with photos and a quote first — see Property Maintenance.
