Land Registry, Cadastre and Physical Reality: Why They Don’t Always Match When Buying Property in Spain

One of the moments that most often surprises buyers when they start reviewing the documentation of a property in Spain is discovering that the surface area is not always the same depending on which document they are looking at.

The villa they have visited may physically have around 200 m² of built area. The cadastral information may show 175 m² and, when a Land Registry extract is obtained, the registered area may be only 150 m².

The first reaction is usually quite logical: which of the three figures is the correct one?

The answer is that the issue cannot always be resolved by simply choosing one of them. In a property transaction, the physical reality of the property, its cadastral description and its Land Registry description can coexist, and the differences between them may have very different origins and consequences.

This is relatively common in areas of the northern Costa Blanca such as Jávea, Dénia, Moraira and Benissa, where a significant part of the housing stock consists of properties that have undergone extensions, renovations and modifications over several decades.

That is why, before buying a property, it is not enough to know how many square metres are shown in the listing. It is important to understand where that figure comes from and whether the available documentation really tells the same story as the property you are actually visiting.

Three different ways of describing the same property

To understand the issue properly, it is useful to distinguish between three concepts that are related, but do not serve exactly the same purpose.

The first is the physical reality of the property, meaning what actually exists on the land. A property may include a main house, swimming pool, covered terrace, garage, outdoor kitchen, separate guest accommodation or extensions that have been added over time.

The second is the cadastral reality. The Spanish Cadastre contains descriptive and graphic information about properties, including plots, buildings, uses and surface areas. However, the fact that a construction appears in the Cadastre does not, by itself, mean that its planning or Land Registry status is fully regularised.

The third is the Land Registry reality, which is the description recorded at the Registro de la Propiedad. This includes ownership, certain charges and rights, and the registered description of the property.

In a relatively recent and properly documented property, it is common for these three realities to be reasonably consistent.

With older properties, the situation can be different.

Why can the surface areas be different?

Many properties on the Costa Blanca were built twenty, thirty, forty or even more years ago and have evolved over time as the needs of their owners changed.

A villa that originally had 130 m² may later have gained an enclosed terrace, an additional bedroom, a porch, a garage converted into living accommodation or an extension to the main floor.

Some of these works were properly authorised and later reflected in all the relevant documentation. Others may only appear in certain records or documents. Some may never have been formally declared.

Differences can also arise without there being any extension at all. Older properties may simply have been measured differently when they were first recorded. Current surveying techniques, cartography and georeferencing make it possible to describe many plots and buildings more accurately than decades ago.

For that reason, a discrepancy does not automatically mean there is a planning infringement or that the sale cannot go ahead.

The important point is to establish why the discrepancy exists.

The mistake of looking only at the Land Registry extract

The Land Registry extract is one of the first documents that should be reviewed when assessing a property, but relying on it as the only source of information can create a false sense of certainty.

Imagine a property that has 160 m² registered at the Land Registry, while the physical building clearly appears to be significantly larger.

The difference may be due to an extension that was never registered, but there may also be municipal documentation that fully explains the situation. Likewise, a structure may appear in the Cadastre without that automatically resolving every planning issue connected with it.

This is why the Land Registry, Cadastre and physical reality should be analysed together.

Where there are significant differences, the review may also require previous title deeds, plans, licences, technical certificates, municipal planning records or information about the age of certain constructions.

A property transaction should not become a last-minute race to correct documents.

The Cadastre does not tell the whole story either

It is quite common for a buyer to check the cadastral information for a property, see that the swimming pool or an extension appears on the plan and conclude that everything must be fully legalised.

The reality is more complex.

The Cadastre and the Town Hall perform different functions, just as the Cadastre and the Land Registry are not interchangeable institutions.

A construction may be included in the cadastral description of a property while it is still necessary to examine how it was built, what planning authorisation existed, how old it is and what its current legal status is.

The opposite can also happen. Valid documentation may exist for certain works even though the property description has not yet been updated across every public record.

For that reason, using only one source of information to draw conclusions about the entire legal situation of a property is rarely advisable.

Can a discrepancy prevent a purchase or sale?

Not necessarily.

Many property transactions involve homes where some type of difference exists between the Land Registry, Cadastre and physical reality.

The more relevant question is: what type of discrepancy exists and what consequences does it have for the buyer?

A minor difference resulting from an old measurement is not the same as discovering a major extension whose planning position has never been reviewed. Likewise, a documentary issue that can be relatively easily updated is not the same as a construction subject to specific planning restrictions.

If mortgage financing is involved, certain discrepancies may become even more relevant because the property will also be subject to a bank valuation and documentary review.

That is why these issues should be analysed before the transaction is too advanced.

Timing matters almost as much as the issue itself

One of the most uncomfortable situations in a property transaction arises when these issues are discovered only after the buyer and seller have already negotiated the price, signed a deposit contract and perhaps even fixed a date for completion before the notary.

At that point, any discrepancy immediately becomes a timing problem.

The buyer may want further clarification before signing. The seller may need to locate old documentation. An architect or technical professional may need to become involved. The bank may ask for additional information and the notary may require certain documents before preparing the deed properly.

All of this is much easier when it is identified at the beginning.

In a well-prepared transaction, surface areas and documentation should be reviewed during the property assessment stage, when there is still enough time to establish the origin of any difference and decide whether further action is required.

This allows a discrepancy to become a manageable issue rather than an unexpected obstacle.

A common example on the northern Costa Blanca

Consider a villa in Jávea that was built in the 1980s.

The original property had 145 m². Later, part of the naya was enclosed, a guest area was created next to the garage and a swimming pool was built.

Today, the property physically has close to 200 m².

The Cadastre reflects approximately 180 m² because some of those works were incorporated into its records later, while the Land Registry continues to describe the property largely as it appeared in the original deed.

At first, the buyer may think there is only one issue: the square metres do not match.

In reality, several different questions should be answered.

Where exactly do those additional square metres come from? When were the works carried out? Is there municipal documentation? Is it possible or necessary to update the Land Registry description? Do the plot, buildings and boundaries correspond? Is there any planning consequence the buyer should understand?

Only after answering these questions can the situation be assessed properly.

What should be checked before buying?

A proper review involves more than simply confirming that the seller’s name matches the registered owner.

Depending on the type of property, several elements may need to be compared:

Not every property will require the same level of investigation.

A recent home within a properly documented development will usually present a very different scenario from a forty-year-old detached villa that has passed through several owners and undergone multiple renovations.

The review should always be proportionate to the property itself.

Land Registry and Cadastre can be coordinated

Over recent years, Spanish property and cadastral legislation has increasingly encouraged graphic coordination between the two institutions.

Where cadastral mapping is incorporated into the Land Registry and the property becomes coordinated, this can provide a clearer legal framework for the geographical position and boundaries of the property.

There are also procedures for using alternative graphic representations where the cadastral mapping does not accurately reflect reality, although these procedures may involve additional checks and, where relevant, neighbouring owners.

However, the fact that there is a legal mechanism available to correct a discrepancy does not mean it should be left until after the purchase.

The buyer should understand what is being acquired and the current state of the documentation before completion.

The advertised surface area should not be the only figure you look at

When a property is marketed as having 250 m², it is very easy to compare that figure with another property of 220 m².

But surface area alone tells less than it appears to.

Before placing an economic value on that difference, it is important to understand exactly what is being included, how that surface area is documented and whether there is sufficient consistency between the property you see and the property you are legally acquiring.

This is especially relevant in detached villas, where covered terraces, basements, garages, guest accommodation, porches and successive extensions may all form part of the property.

Reducing the entire analysis to a single number can therefore be misleading.

A property can still be an excellent purchase even if a documentary discrepancy exists.

The difference is knowing about it before signing, understanding where it comes from and making the decision with all the relevant information available.

Why Grupo García looks at these issues from the beginning

After years of working with buyers and sellers in Jávea, Dénia, Moraira, Benissa and the wider northern Costa Blanca, there is one thing we have learned: many issues that seem difficult when completion is approaching were perfectly manageable when there were still several weeks available.

That is why we believe estate agency work should not be limited to arranging viewings, negotiating the price and fixing a completion date.

Knowing a property properly also means understanding its documentation, identifying possible inconsistencies and recognising when a legal or technical review may be required.

The aim is not to turn every purchase into an endless investigation.

Quite the opposite.

The better a transaction is prepared from the beginning, the fewer surprises there should be at the end.

If you are looking for a property in Jávea, Dénia, Moraira or Benissa, the Grupo García team can help you understand not only the commercial aspects of a property, but also coordinate the information needed so that you have a clearer picture of what you are buying before committing to the transaction.

Frequently asked questions

Is it normal for the Land Registry and Cadastre to show different surface areas?

Yes, particularly in older properties that have undergone renovations, extensions or different documentary updates over time. A difference does not automatically mean there is a serious problem, but the reason for it should be identified before buying.

Which surface area matters more: the registered one or the cadastral one?

There is no universal answer because the Land Registry and Cadastre perform different functions, and the physical reality of the property must also be taken into account. The correct approach is to compare the available documentation with the property itself and understand why the differences exist.

If a construction appears in the Cadastre, does that mean it is legal?

Not necessarily. Inclusion in the Cadastre does not by itself replace a planning review. Where there are doubts about extensions, pools, porches or other structures, it may also be necessary to examine municipal records.

Can I buy a property if the square metres do not match?

In many cases, yes. The important point is to understand the cause of the discrepancy, assess its consequences and determine whether any action is required before or after the purchase. Not all discrepancies have the same significance.

When should all of this be reviewed?

Ideally before taking on important contractual commitments and, in any case, sufficiently in advance of completion. Identifying a discrepancy early allows it to be reviewed calmly; discovering it when a signing date has already been fixed can create unnecessary delays and renegotiations.

What documents should I request before buying a villa on the Costa Blanca?

As a starting point, the title deed, Land Registry information, cadastral information and available documentation relating to the property should normally be reviewed. Where there are renovations or significant discrepancies, it may also be necessary to examine licences, municipal records, plans or other technical documents