When Catastro and Deeds Disagree: Costa Blanca Villas

When the Catastro, the deeds and the house don't agree

Discovering that the surface area on a prospective Costa Blanca villa's cadastral record is 30 square metres short of what the escritura (deed) states — or that the pool never appears in either document — can feel alarming at first. But this mismatch is remarkably common in older Spanish properties, and it is one of the most solvable problems in the buying process, provided it is caught early and the right person handles it.

Three records, three different jobs

Understanding why discrepancies arise starts with knowing what each record actually does.

The Catastro (Cadastre) is an administrative inventory managed by the Dirección General del Catastro under Spain's Finance Ministry. It describes every property physically: plot area, building footprint, construction year and use. Its primary purpose is taxation — it feeds the IBI property tax calculation. It is not a title document.

The Registro de la Propiedad (Land Registry) records legal ownership, mortgages and encumbrances. It is the document that legally defines what you own and protects buyers against third-party claims. Where Catastro and Registro diverge, the Registro carries greater legal weight for ownership purposes.

The physical building is simply what stands on the ground — which may differ from both records if extensions, pools or terraces were built and never formally declared.

The three records are maintained independently, so the same property can carry three different floor-area figures. Spain's Ley 13/2015 made Catastro–Registro coordination a legal requirement going forward, but older properties have accumulated decades of uncoordinated updates.

Why older Costa Blanca villas are especially affected

Many villas along the Costa Blanca were originally built in the 1970s, 1980s and 1990s. Extensions were added informally, pools dug, terraces enclosed. Sellers may have updated the escritura at some point without touching the Catastro, or vice versa. Occasionally neither record was updated. Your surveying architect reports one figure; the nota simple from the Registro shows another; the Catastro's certificado descriptivo y gráfico shows a third.

Spotting it during due diligence

The moment to catch a discrepancy is before you sign the arras (reservation contract), not at the notary's desk on completion day. Your independent lawyer should pull three documents as part of standard due diligence:

1. Nota simple from the Registro de la Propiedad — shows registered area, ownership chain and any charges.
2. Certificado descriptivo y gráfico from the Catastro — shows the physical description and satellite footprint.
3. Technical survey — ideally a report from a licensed architect or aparejador confirming the actual built surface on the ground.

If all three agree, there is no issue. If they diverge, flag it before committing any funds.

The four resolution routes

How the discrepancy is fixed depends on its type and size.

1. Minor surface-area gap (under 5 %) Where the deeds describe a slightly larger or smaller area than the Catastro records, the seller can make a rectification statement before the notary in the completion deed itself. The notary notifies the Catastro directly under Article 18.2 of the Texto Refundido de la Ley del Catastro Inmobiliario (RDL 1/2004). The correction carries through the same day with no separate administrative procedure.

2. Significant surface-area gap (above 10 %) Gaps beyond 10 % trigger a formal Catastro correction procedure. The seller — supported by their lawyer and usually a licensed surveyor — submits evidence (a dimensioned plan, technical certificate and the existing deed) to the Catastro. Resolution typically takes one to three months. The Registrador will not accept the corrected description until the procedure is complete, which is why this must be handled well before the target completion date.

3. Undeclared buildings or extensions ("declaración de obra antigua") A pool built in 1992, a garage enclosed in 2004, an additional bedroom added without a permit — these elements are often missing from both the Catastro and the deeds. The solution is a declaración de obra nueva por antigüedad (declaration of old construction). Under the Valencian Community's planning law (LOTUP, Ley 5/2014), the enforcement prescription period is four years for minor works and six years for major works, meaning most additions to older Costa Blanca villas are well beyond any planning risk.

The process requires:

• A technical certificate from a licensed architect confirming the structure, its dimensions and approximate construction date.
• A certificado de antigüedad from the Ayuntamiento confirming the structure predates the prescription period.
• A notarial deed formalising the declaration.
• Catastro update, followed by Land Registry inscription.

This typically takes four to eight weeks once all documents are assembled, though slow municipal responses can extend this timeline.

4. Registry gaps (property not fully registered) Occasionally a building or part of a plot has no registry entry at all. Resolution involves a formal expediente de dominio under Articles 198–210 of the Ley Hipotecaria (as reformed by Ley 13/2015). This is a notarial voluntary-jurisdiction procedure and can take several months, so identifying it early is critical.

Who resolves it — and by when

The key commercial point: make it a condition of the arras that the seller resolves all discrepancies before completion. Never accept a verbal promise that "it will be sorted after signing." If you need a mortgage, your bank's valuer will identify the mismatch and your lender may decline to proceed until it is rectified. Even cash buyers face complications at future resale if the records remain misaligned.

Your buyer's agent or independent lawyer will draft the arras clause to specify the precise correction required, a deadline, and what happens if the seller fails to deliver. That single clause protects your purchase more than almost anything else.

Frequently asked questions

Q: Can I complete the purchase while a discrepancy is still unresolved? A: Technically a notary can note a discrepancy and still proceed, but it is rarely advisable. Lenders will not normally provide a mortgage on a property with unresolved cadastral issues, and a future sale will face the same obstacle. Always make resolution a pre-completion condition.

Q: How long does resolving a Catastro discrepancy typically take? A: Simple notarial corrections can happen on completion day. A formal Catastro administrative procedure takes one to three months. An obra antigua declaration with full municipal certification usually takes four to eight weeks, though municipal delays do occur.

Q: Who pays for the correction? A: Typically the seller, since the property should be delivered as described. Your arras contract should make this explicit.

Q: Does a discrepancy mean the property is illegal? A: Not necessarily. An extension that was never declared is a paperwork gap, not automatically an illegal structure — especially if it predates the prescription period. Your lawyer will assess whether planning regularisation is needed or whether a simple obra antigua declaration suffices.

Q: Will correcting the Catastro record change my IBI bill? A: Yes. Once updated, SUMA (the Alicante provincial tax agency) will revise the IBI assessment. A larger declared surface normally means a modest IBI increase, which your lawyer can estimate in advance.

Q: How does a buyer's agent help with this? A: A buyer's agent flags Catastro–deed mismatches during initial due diligence, long before the arras. They coordinate with the seller's agent, recommend a specialist lawyer, and make sure the correction clause is robust — so you reach completion day with clear records and no surprises.