Flood Information Before Buying a Property

Find the exact property

Begin with a confirmed location or parcel boundary, rather than an approximate address pin. Spain’s National Flood Zone Mapping System, SNCZI, brings together official flood mapping and public hydraulic domain information. Examine the available layers and their dates. Record which part of the property was checked. If the map does not contain a study for the area, describe the information as unavailable rather than concluding that flooding cannot occur.

Read the map with its legend

Flood layers describe different scenarios and concepts. A return period is a probability measure, not an appointment for the next event. Check whether the layer concerns river flooding, coastal flooding, a preferential flow zone or another feature. For a decision involving works or occupation, obtain an interpretation of the relevant authority’s information. Save the legend and layer name with the map so another professional can reproduce the check.

Look beyond the living room

Inspect basement access, garage ramps, low courtyards, drainage outlets and the route used to leave the area. Ask for documented past incidents, repairs and community discussions. An upper-floor flat may avoid direct water entry while still relying on lifts or electrical equipment below. Distinguish what the seller reports from independent evidence. Where a concern is material, ask a qualified specialist which investigation would resolve it.

• Request photographs and invoices for previous water damage repairs.
• Ask how access would work during an emergency.

Make the findings actionable

Discuss cover, exclusions and the stated property characteristics with your insurer before committing. Ask the planning adviser whether the mapped situation affects your intended works or use. Keep a short record of what was checked, what remains unknown and who will investigate. A flood map is valuable evidence, but it is not a guarantee of insurability or a prediction that a particular building will remain dry.