Before you sign anything on a beachfront or near-shore property on the Costa del Sol or Costa Almería, verify two separate things: whether the plot sits inside a mapped flood zone (zona inundable), and whether any part of it falls within the reach of the Ley de Costas — Spain's coastal law that defines a public maritime-terrestrial domain and protective setbacks measured from an official boundary called the deslinde. These are not the same issue, they are checked in different registries, and a property can be perfectly legal, mortgageable and insurable while still carrying serious limits on what you can build, extend or renew. In Andalucía (which covers both the Costa del Sol and Costa Almería) resale purchase tax is 7% ITP, so the transaction costs are the same whether or not the home is exposed — the risk is in the coastal law and hydrology, not the tax.
The two documents that answer these questions are the Nota Simple from the Land Registry (which now flags coastal-domain proximity) and the official flood-hazard mapping in the national Sistema Nacional de Cartografía de Zonas Inundables (SNCZI), run by MITECO. A good lawyer will also request a certificado de dominio público marítimo-terrestre from the regional Coastal Demarcation (Demarcación de Costas) confirming exactly where the deslinde line runs relative to your boundary. This article explains what each of those means in practice, where the risk actually concentrates on our two Andalusian coasts, and the concrete checklist to run before the arras deposit — not after.
The Ley de Costas (Law 22/1988, substantially reformed in 2013 and its 2014 regulations) establishes that the shore itself — beaches, dunes, cliffs and the reach of the largest storms — is dominio público marítimo-terrestre (DPMT). It belongs to the State and cannot be privately owned. You can never buy land inside the DPMT; older properties that predate the law may hold a temporary concesión (concession) to occupy it, but that is a licence with an expiry date, not ownership.
Behind the public domain the law imposes two protective easements measured landward from the deslinde (the official demarcation line):
The practical consequence: a villa can be fully registered and financeable yet sit inside the 20-metre servidumbre de protección, meaning a future major renovation or rebuild may need authorisation from the regional government and, sometimes, from Costas itself. This is exactly the kind of detail our wider beachfront property checklist for 2026 tells buyers to confirm in writing before committing.
The deslinde is not guesswork — it is a mapped, approved line. Follow this order:
Never rely on the seller's assurance or the estate agent's brochure alone. A qualified independent real estate lawyer should carry out these coastal searches as standard due diligence, and their fee (roughly 1% + IVA) is trivial against the cost of buying a home you cannot legally extend or that has a concession expiring in your ownership.
Flood exposure on our two Andalusian coasts comes from three distinct sources, and each is mapped differently:
The Costa del Sol's built-up strip from Málaga through Marbella to Estepona is largely marine and drainage exposure with pockets of river-mouth risk; the province saw serious flooding episodes in recent years. The Costa Almería — from Almería city through Roquetas de Mar, Mojácar and Vera — is dominated by rambla flash-flood risk because so many urbanisations sit on the fans of dry watercourses. Semi-arid does not mean safe: it is the very rarity of rain that makes each event so violent.
The national SNCZI viewer maps flood hazard by probability, expressed as return periods. Understand these three:
| Return period | Annual probability | What it means for a buyer |
|---|---|---|
| High probability (10 years) | ~10% each year | Frequent flooding — avoid, or expect strict build limits and high insurance loading. |
| Medium probability (100 years) | ~1% each year | The key planning threshold; construction is restricted, mortgages and insurance get harder. |
| Low probability (500 years) | ~0.2% each year | Residual risk — usually manageable but worth knowing and insuring for. |
If a plot sits inside the 100-year zone, treat it as a red flag that needs expert review, not an automatic no — but you must understand what it does to your building rights and cover.
Spain has a valuable safety net most buyers don't know about: the Consorcio de Compensación de Seguros, a public body that compensates for "extraordinary risks" — including flooding and storm surge — provided you hold a valid home insurance policy. The surcharge that funds it is added automatically to standard buildings and contents policies. In practice this means that a properly insured home in a flood-exposed area still has meaningful catastrophe cover, which is a major reason buildings insurance is effectively non-negotiable on the coast.
That said, the Consorcio pays out on the insured value, so under-insuring your rebuild cost leaves you short. And ordinary damp, gradual erosion or maintenance issues are excluded — only sudden, extraordinary events qualify. We cover the mechanics in our 2026 property insurance guide; the key point for a flood-zone buyer is to insure at full reconstruction value and keep the policy continuously active.
Coastal erosion is a slow-motion version of the same risk. Beaches on both coasts are periodically replenished with imported sand, and the deslinde can, in theory, be revised inland if the sea advances — pulling more of a plot into the protective easement over time. When you buy front-line, you are also buying a relationship with a shoreline that moves. Practical questions to ask: Is the beach in front artificially maintained? Have there been recent deslinde revisions in the municipality? Does the community of owners fund any sea-defence or drainage works?
That last point ties directly into shared costs. Front-line urbanisations sometimes carry higher levies for sea walls, promenade repairs or pumping stations, which show up in your community fees. Read the minutes of the last few AGMs before you buy — under the rules set out in the Horizontal Property Law, approved special assessments bind the incoming owner.
| Factor | Costa del Sol | Costa Almería |
|---|---|---|
| Dominant flood source | Marine surge + urban drainage; some river mouths | Rambla flash flooding (DANA), plus marine |
| Resale purchase tax (ITP) | 7% | 7% |
| New-build stamp duty (AJD) | 1.2% (Andalucía) | 1.2% (Andalucía) |
| Ley de Costas relevance | Very high on front-line urbanisations | High, especially older beach urbanisations and concessions |
| Key document to demand | Costas certificate + SNCZI check | SNCZI rambla check + Costas certificate |
| Insurance note | Consorcio flood cover via active policy | Consorcio cover essential given flash-flood exposure |
Because both coasts sit in Andalucía, the tax arithmetic is identical — 7% ITP on resales, or 10% IVA plus 1.2% AJD on new builds, with roughly 7–11% total transaction costs on top of the price. Remember the tax base is the higher of the price paid or the cadastral valor de referencia, so a bargain on a distressed coastal plot can still be taxed on the reference value. The full breakdown is in our 2026 taxes on buying property guide.
If you are weighing a new development against an older beach villa, our comparison of off-plan versus resale is a useful companion — newer schemes are usually built to current flood and setback rules, whereas older front-line homes may carry legacy concessions or non-conforming positions. For a wider view across all four of our coasts, see Costa Blanca vs Costa del Sol: comparing the four coasts.
Homes legally built before the law and sitting in the servidumbre de protección are generally protected and can be maintained, though extensions and full rebuilds may need authorisation. Properties actually inside the public domain typically hold a time-limited concession rather than ownership; the risk is expiry, not sudden demolition. Always confirm status via a Costas certificate before buying.
Not automatically, but a plot in the 100-year zone can make lenders more cautious and insurance more expensive. Because most non-resident lending is conservative anyway, factor this into your search early — see our non-resident mortgage guide.
Yes. Rarity is the danger — a semi-arid catchment produces sudden, high-volume flash floods during a DANA, and dry riverbeds fill in minutes. Check the SNCZI mapping and never assume a "dry" rambla is inactive.
Public promenades are usually the municipality's responsibility, but private sea walls, drainage and communal areas fall to the community of owners and can trigger special levies binding on the buyer. Review the AGM minutes and community accounts first.
It covers "extraordinary" events including flooding and storm surge, funded by a surcharge on your home insurance — but only if you hold a valid, adequately insured policy. Keep cover continuous and at full rebuild value.
It can be revised, typically where the shoreline shifts significantly. A revision could bring more of a plot into the protective easement, which is why front-line buyers should ask about recent demarcation activity in the municipality.
A beautiful sea view is worth having — but only once you know exactly where the coastal boundary runs and how the plot sits relative to Spain's flood maps. At Mediter Real Estate we help international buyers verify the deslinde, servidumbre status and flood exposure of every seafront and near-shore home across the Costa del Sol and Costa Almería (and our Costa Blanca and Costa Cálida offices too), so you commit with the full picture. Get in touch with our coastal team to discuss a specific property — we will run the checks before you sign.
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