Flood risk: what a flood-hazard zone means for a buyer
Par Lumi · Mis à jour: 16 juin 2026, 00:00 UTC
A flood-hazard zone affects insurance, repairs and resale. How to read SYKE's flood maps before buying a home.
Ce guide décrit les règles et les usages en Finlande.
This guide is only available in English.
Important: A flood zone can affect insurance, basement spaces and resale — confirm your insurance terms.
Some Finnish homes sit in a flood-hazard zone near the sea or a watercourse. It doesn't prevent living there, but it's worth knowing: it affects risk, insurance and value.
What the zones mean
SYKE maps flood hazard by return period. 1/100a means a flood occurring on average once in a hundred years (significant); 1/250a is rarer. Coastal and watercourse floods are distinguished.
Why it matters
Flood risk can affect insurance terms, the use of basement and ground-floor spaces, and resale. In new developments the risk is addressed in planning.
How to check
Lumi shows the address's flood-hazard status from SYKE's open data. Also ask the housing company whether flood protection has been done.
Questions fréquentes
- Does a flood zone prevent buying?
- No, but it's a risk worth pricing in and confirming with your insurer.
- What does 1/100a mean?
- A flood occurring on average once in a hundred years — a significant hazard class.
- Where does the flood data come from?
- From the open flood-map data of SYKE and the ELY centres.
Sources
Voir aussi
Ce guide fournit des informations générales, pas de conseil personnalisé. Vérifiez les chiffres et les règles auprès de sources officielles.