Coastal storms, storm surge and erosion on Spain's coasts

Key rules

• Beach ownership: Beaches, dunes and the storm-wave shore are public and cannot be privately owned.
• Protection zone: Within 100 m of the shore (20 m in some older urban land), new building is restricted and you may not extend or rebuild.
• Before you sign: Check the deslinde notes in the land registry and get a Costas report for the exact plot.
• Risk maps: Look up your exact address on the official coastal flood and climate-change maps.

Where the risk is highest

Coastal risk is real on Atlantic and Cantabrian winter coasts, around the Mar Menor and in the Ebro Delta. Check the official risk maps and the property rules before you live by the sea.

The areas named as most exposed are:

• The Ebro Delta, which is very low-lying and sinking.
• Low sandy Mediterranean coasts: the Maresme, the Valencia coast, the Almería and Murcia coasts and the Costa del Sol beaches.
• The Mar Menor sandbar, La Manga.
• The Gulf of Cádiz, with its marshes and the Doñana area.
• Exposed beaches and estuaries in Galicia and along the Cantabrian coast.
• Beaches and low town fronts in the Balearic and Canary Islands.

Why the Mar Menor floods

The land around the Mar Menor is a flat plain that drains into the lagoon. It has intensive irrigated farming and a lot of sealed urban ground, so water runs off fast. Autumn DANA storms (cut-off lows) bring torrential rain, as in 2016, 2019 and 2022.

The runoff carries sediment and nutrients into the lagoon. Farm nitrates caused green-water crises in 2016 and 2019 and mass fish die-offs in 2019 and 2021. The lagoon was given legal personhood in 2022. Protection measures, farming limits and flood works are in place, but problems persist. If you are looking here, ask the Murcia regional government and the Segura basin authority about flood works and the lagoon's current condition.

Shoreline retreat

Retreat varies a lot. Parts of the Ebro Delta, the Mediterranean and the Gulf of Cádiz lose well over a metre of beach a year in places. Other beaches are stable or gain sand. Responses include adding dredged sand, restoring dunes, breakwaters and groynes, and in some areas managed retreat. Ask the national coastal directorate for the local rate and for any planned protection works at your address.

Property rules near the shore

You cannot own the beach itself. Beaches, dunes and the shore up to the reach of the highest storm waves are public land. Private buildings on public land have concessions of up to 75 years, including extensions.

Land behind the shore carries four restrictions:

• A public-passage strip of 6 m, which can be extended to 20 m.
• A public-access strip.
• A protection zone of 100 m from the inner edge of the shore, or 20 m in urban land that was already consolidated by 1988. New building is restricted here and uses need authorisation.
• An influence zone of at least 500 m.

A property in the protection zone may not be extended or rebuilt. Before you buy, check the Registro de la Propiedad for notes about the deslinde, the official line marking the public shore. Ask for a Costas report saying whether the property is affected, and check its planning status. Have a lawyer confirm the deslinde status of the exact plot. The checklist and questions below walk you through this.

Checklist

• Look up your exact address on the official coastal flood and climate-change maps of the Ministry for Ecological Transition.

• Find out whether the area is among the most exposed: the Ebro Delta, low sandy Mediterranean coasts, La Manga and the Mar Menor, the Gulf of Cádiz, Galicia and the Cantabrian coast, or the Balearic and Canary beaches.

• Check the land registry (Registro de la Propiedad) for notes about the deslinde, the boundary line of the public shore.

• Request a Costas report on whether the property is affected by the shore rules.

• Check the planning status, and ask whether the plot sits in the 100 m protection zone, where extensions or rebuilding may not be allowed.

• Hire a lawyer to confirm the deslinde status of the specific plot before you sign.

Frequently asked questions

Why does the Mar Menor area flood so often?

The Mar Menor area floods because the Campo de Cartagena is a flat plain that drains into the lagoon. Farmland and sealed urban ground add runoff, and autumn cut-off lows (called DANA) bring torrential rain, as in 2016, 2019 and 2022. The rain also washes nutrients into the lagoon, which has caused green-water crises and fish die-offs.

Can I own a house on the beach itself in Spain?

No, you cannot privately own beaches, dunes or the shore up to the reach of the highest storm waves, because this land is public. Buildings already on it work under concessions of up to 75 years, including extensions. Land behind it has easements, with a protection zone of 100 m, or 20 m in urban land consolidated by 1988.

What should I check before buying near the shore?

Check the land registry (Registro de la Propiedad) for notes about the deslinde, which is the boundary line of the public shore. Ask for a Costas report on whether the property is affected, and check its planning status. A property in a protected zone may not be extended or rebuilt, so ask a lawyer to check the specific plot.

How fast is the shoreline retreating in Spain?

The rate varies widely, and some sandy beaches lose well over a metre a year in places. The Ebro Delta, parts of the Mediterranean coast and the Gulf of Cádiz are examples, while other beaches are stable or gain sand.