Property due diligence in Spain: the essential checks every foreign buyer should make

Property due diligence in Spain is the process of verifying a property’s legal status, tax situation, urban planning compliance, and physical condition before you commit any money. For foreign buyers, it covers four critical areas: registry checks, urban planning verification, tax and financial review, and technical inspection. Skipping or rushing this process is one of the most common, and costly, mistakes international buyers make. At Ábaco Advisers, our independent legal team coordinates every step of the due diligence process on behalf of foreign buyers, in their own language and with no ties to estate agents or sellers.

According to the Colegio de Registradores, foreign purchasers continue to account for a significant share of all transactions in Spain, with strong demand in coastal regions and the islands. But the appeal of sunny terraces and sea views shouldn’t distract from one essential reality: in Spain, many debts and liabilities are attached to the property itself, not to the owner. If you buy a home with unpaid taxes, community fees, or unresolved planning issues, those problems become yours. This article explains what each area of verification involves and why an independent lawyer should coordinate the entire process on your behalf.

What does property due diligence involve in Spain?

Property due diligence in Spain is a structured verification process covering three areas: registry checks, urban planning compliance and tax and financial review. A technical inspection is optional. The scope depends on the type of property, its location, and the region’s specific regulations.

There is no single standardised due diligence procedure in Spain. A modern apartment in a city centre will require different checks from a rural finca with outbuildings. New builds need verification of developer guarantees, while resale properties demand closer attention to renovation history and community debts. Regardless of the property type, the process must be completed before you sign any binding contract or pay a deposit.

The difference between buying with and without professional guidance can be dramatic. Consider two representative scenarios from the Spanish market. A couple who purchased a Costa del Sol apartment without independent legal advice later discovered an unlicensed terrace extension and unpaid community debts. The total cost to resolve these issues exceeded €35,000. By contrast, a family who engaged an independent lawyer from the start completed their purchase of a villa in Jávea without a single incident, paying approximately €3,000–4,000 in legal fees, less than 1% of the property value.

The typical due diligence process takes between 5 and 15 working days, depending on the complexity of the property. Rural or older properties may require additional time for urban planning enquiries and architect inspections.

How do you check the legal and registry status of a property?

The starting point for any property due diligence in Spain is the nota simple from the Land Registry (Registro de la Propiedad). This document confirms legal ownership, mortgages, debts, and any charges registered against the property.

The nota simple reveals the registered owner’s identity, any existing mortgages or liens, embargoes, easements, and court orders. Under Article 34 of the Ley Hipotecaria, a buyer who acquires in good faith from a person who appears as the legitimate owner in the Land Registry is protected, provided they register their own acquisition. However, this protection only applies to information that appears in the Registry, and that is precisely the limitation.

The nota simple does not reveal building irregularities, unpaid community fees, or planning infringements. This is why a second verification is essential: comparing the Land Registry information with the Cadastre (Catastro). The Cadastre is the official property database maintained by the Spanish tax authorities, recording the physical description, boundaries, and built area of each property. Discrepancies between these two registers are a common red flag indicating undeclared construction or modifications.

Your lawyer should also verify the public deed (escritura pública) to confirm that all three records, Land Registry, Cadastre, and Title Deed, are consistent. If they are not, the irregularities must be identified and assessed before the purchase can proceed safely. For more detail on how the Land Registry works, see our guide on the Spanish Land Registry. You may also find it useful to understand the two registers that record property information in Spain.

Why is urban planning verification essential before buying?

Because a property that appears perfectly fine may have unlicensed works, sit on protected land, or lack the required first occupation licence, problems that the Land Registry alone will not reveal.

The critical step that most buyers skip is to request: the building licence (Licencia de Obra), the first occupation licence (Licencia de Primera Ocupación).

A Certificate of no urban infraction is particularly important in coastal and rural areas. During Spain’s construction boom between 1995 and 2009, large numbers of homes were built on rural land (suelo no urbanizable) without proper construction licences, especially in provinces like Almería, Málaga, and Alicante. According to data cited in Decreto-Ley 3/2019 from the Junta de Andalucía, out of approximately 500,000 buildings on non-developable land in Andalusia, around 300,000 were irregular constructions.

For rural properties or homes with visible modifications, commissioning a qualified Spanish architect to physically inspect the property is essential. The architect verifies that what has been built matches the approved plans and identifies any structures that may lack the correct permits. If irregularities are found, the situation may still be resolvable, but this must be assessed before you commit. For more detail on building irregularities and the AFO regularisation process, see our guide on illegal construction in Spain. Our article on making checks before you buy is also useful.

What tax and financial checks should you carry out?

You need to verify that all property taxes are paid, understand the transfer taxes you will owe, and confirm there are no hidden financial liabilities attached to the property.

The most immediate check concerns the IBI (Impuesto sobre Bienes Inmuebles), the annual local property tax. Request the last four years of receipts to confirm they have been paid. Unpaid IBI is transferred to the new owner upon purchase, so any outstanding amounts become your responsibility.

Community fees require equally careful scrutiny. Under Article 9.1.e) of the Ley de Propiedad Horizontal (as amended by Ley 8/2013), the buyer of a property in a horizontal property regime is liable for community debts corresponding to the year of acquisition and the three previous calendar years. The community administrator must issue a certificate of debts, which the seller is legally required to present before the notary. Your lawyer should request and review this certificate independently.

The transfer taxes you will pay depend on whether the property is new or resale, and on the autonomous community where it is located:

• Resale property: ITP (Impuesto de Transmisiones Patrimoniales), typically between 6% and 10% depending on the region. In the Valencia Region, ITP will be reduced from 10% to 9% from June 2026.
• New build: IVA (VAT) at 10%, plus AJD (Stamp Duty), which varies by region. In Valencia, AJD will decrease from 1.5% to 1.4% from June 2026.

When the seller is a non-resident, Spanish law requires the buyer to retain 3% of the purchase price and pay it to the Agencia Tributaria on account of the seller’s capital gains tax. This is a legal obligation, not a choice. Post-purchase, non-resident buyers must also file the annual IRNR (Impuesto sobre la Renta de No Residentes) declaration via Modelo 210. For a full breakdown of costs, visit our guide on the cost of buying property in Spain.

How important is a technical inspection of the property?

A technical inspection by a qualified architect or surveyor reveals structural problems, damp, roof defects, and issues with utilities that documents alone cannot show.

While legal and financial due diligence covers what is written in official records, a physical inspection covers what you can actually see, and what you might miss without professional eyes. Key areas include structural elements (beams, load-bearing walls, foundations), the roof and external facades, plumbing and electrical installations, damp, insulation, and the condition of terraces and balconies.

This step is especially relevant for older properties, rural homes, or buildings that have undergone successive modifications without documentation. You should also verify whether the property has a valid Energy Efficiency Certificate (Certificado de Eficiencia Energética), mandatory for any sale in Spain.

What role does an independent lawyer play in property due diligence?

An independent lawyer coordinates the entire process, ensures all checks are completed before you sign, and protects your interests from the initial enquiry through to completion at the notary.

It is important to understand the distinction between the three key professionals involved in a Spanish property transaction. The notary (notario) is a public official who verifies identities, witnesses the signing of the public deed, and ensures certain formalities are met, but does not investigate community debts, urban planning status, or hidden defects. The estate agent facilitates the sale but represents their own commercial interest in closing the deal. Only an independent lawyer, acting exclusively for the buyer, has the mandate and the incentive to identify problems before they become your liability.

Your lawyer should also ensure that the arras contract (contrato de arras) includes suspensive conditions that allow you to recover your deposit if due diligence reveals serious issues. Without these clauses, walking away means losing your deposit, typically 10% of the purchase price. For buyers who cannot be present in Spain, granting a power of attorney (poder notarial) to your lawyer enables them to act on your behalf. For more on how the notary fits into the process, see our article on the Spanish Notary.

Key takeaways

Property due diligence in Spain covers four essential areas: registry verification, urban planning compliance, tax and financial review, and technical inspection. Each area can reveal problems that the others do not, which is why a comprehensive approach,  coordinated by an independent lawyer, is the safest way to buy.

With Spanish property prices continuing to rise and international demand remaining strong, thorough due diligence is more important than ever. A few thousand euros in legal fees can prevent tens of thousands in unexpected costs. For a broader view of the buying process, our guide on the ten steps to buying a house in Spain provides a useful overview. You can also review the pitfalls of buying property in Spain to understand the most common mistakes.

If you are considering buying property in Spain and want to ensure the legal, fiscal, and urban planning situation is thoroughly verified, contact Ábaco Advisers. We will be happy to offer you a free consultation in the language of your choice.

Frequently asked questions

How long does property due diligence take in Spain?

Typically between 5 and 15 working days. Timeframes depend on the municipality’s response speed and the property’s complexity. Rural or older properties may require additional time for Town Hall verification and architect inspections.

Can I sign an arras contract before due diligence is complete?

You can, but it carries risk. If you do sign early, include a suspensive clause that allows you to recover your deposit if serious legal, planning, or financial problems are found. Your lawyer should draft this condition as part of the contract.

Is property due diligence different for new builds and resale properties?

Yes. Resale properties require checks on previous debts, community payments, renovation history, and planning compliance. New builds require verification of developer guarantees (aval bancario), building licences, the licencia de primera ocupación, and that payments are properly protected.

Do I need to be in Spain to complete the due diligence process?

No. You can grant a power of attorney (poder notarial) to your lawyer, authorising them to act on your behalf for all checks, contract signing, and even completion at the notary. This is common practice for international buyers.

What happens if due diligence reveals a problem with the property?

Options include renegotiating the purchase price, requiring the seller to resolve the issue before completion, retaining funds in escrow to cover regularisation costs, or withdrawing from the purchase entirely with your deposit protected — provided your contract includes the appropriate conditions.