Unlicensed works in Spain: the property problem foreign buyers miss

Foreign buyers often treat Spanish property legality as a title question. They ask whether the seller owns the property, whether the mortgage will be cancelled, whether the community fees are paid and whether the notary will sign. Those questions matter. They do not answer the planning question.

The planning question is narrower and more dangerous: does the physical thing you are buying match what the town hall authorised, what the technician certified, what the Land Registry records, what Catastro taxes and what the law permits that property to be used for? If the answer is no, the problem may be a missing paper, a fixable legalisation, a price adjustment, a mortgage problem, a resale problem, or a red line that should stop the purchase.

This page is written for foreign buyers and owners, especially people using a property as part of a non-lucrative visa plan. It does not repeat the whole Spanish property purchase process. It focuses on the specific gap between "I own it" and "it is lawful, habitable and usable for the purpose I need."

“A client does not need a perfect property. They need to know which imperfection they are buying. The dangerous file is the one where the pool, guest room or rural house is treated as normal because everyone can see it, but nobody has checked whether the town hall ever accepted it.”

The short answer

In Spain, the legal title to a property and the urban-planning legality of the building are related but not identical. The Land Registry can show that the seller owns the house. Catastro can show the surface area used for tax. The notary can execute the deed. None of those facts, alone, proves that every extension, pool, garage conversion, terrace enclosure or change of use was authorised by the town hall.

The usual sequence for lawful building work is: a planning title before the works, usually a licencia de obras or, for some lighter works, a declaration or communication where local rules allow it; technical direction and final certification where required; and then, for a new building or relevant first use, a first-occupation licence, first-occupation declaration or equivalent document proving that the building can be used for its intended residential purpose.

When that sequence is broken, the answer is not always "do not buy." It may be "legalise before completion," "retain part of the price," "exclude the square metres from valuation," "treat it as a future demolition risk," "accept AFO status with eyes open," or "walk away." The key is to decide before the arras contract makes leaving expensive.

The four files that must line up

A careful review compares at least four different records. Each one answers a different question.

The Land Registry answers the ownership and charges question: who owns it, what is registered, what mortgages, easements, embargoes or limitations appear, and how the building is described in the public register. It is essential, but it is not a full urban-planning audit.

Catastro answers a tax and mapping question. It may show a larger surface area than the registry, or show a pool that the registry does not. That discrepancy is useful because it points to something to investigate. It does not prove that the town hall approved the works.

The municipal planning file is where the real building-permit question sits: the licence or declaration for the works, the approved project where one exists, conditions, inspections, disciplinary files, occupation licence or declaration, and any orders affecting the property.

The physical property is the final check. The lawyer and technician should compare what is recorded with what exists: extra bedrooms, enclosed terraces, a basement used as living space, a pool, a separate guest unit, a pergola turned into a room, a garage changed to a studio, or a rural outbuilding presented as accommodation.

Most problems are found in the gaps between those files. The registry says 110 square metres, Catastro says 168, the agent says "the owners closed the terrace years ago," and the town hall file contains no licence for that extra room. That does not tell you the answer, but it tells you the question.

First-occupation licence: what it proves

The licencia de primera ocupación, or the equivalent first-occupation declaration where regional law has moved the process into a responsible-declaration model, is the document that connects the completed building to lawful residential use. In simple terms, it shows that the finished building matches the authorised project and can be put to the intended use.

For a new build, a major rehabilitation or a change that creates a new dwelling, this document can be central to completion, utility connection, financing and resale. Article 28 of the consolidated Land and Urban Rehabilitation Act links declarations of new work to the administrative act required by planning law, technical certification that the work matches the authorised project, and the authorisations needed to guarantee that the building meets the conditions for its intended use. The Directorate-General for Legal Certainty and Public Faith has repeatedly treated the first-occupation licence, or its equivalent, as the usual expression of that final-use control, subject to regional declaration systems.

Do not reduce this to one acronym. Depending on the autonomous community and the date, the document may be called a first-occupation licence, first-use licence, licencia de ocupación, licencia de utilización, cédula de habitabilidad, responsible declaration of first occupation, or another equivalent title. The name matters less than the function: has the competent administration accepted that this building can be occupied for residential use?

This is why the topic also appears in our page on tourist rental licences and the non-lucrative visa. A tourist-use declaration often depends on the dwelling having the underlying residential-use and habitability documents first. If the base home has not cleared that gate, a rental licence is built on sand.

Why the registry is not enough

Buyers tend to overtrust the nota simple because it is official, crisp and familiar. It is official. It is not complete for this purpose.

Article 28 is strong for new work declarations, especially when a new building or completed works are being declared for registration. Notaries and registrars require the planning title, technical certification and, for completed work, the documents showing that the building meets the conditions for the intended use, plus other building-law requirements where applicable. That is a safeguard.

But it does not eliminate every later or older problem. A flat may have a legally registered original building and an unlicensed enclosed terrace. A villa may be registered as a dwelling while the separate guest house is not. A pool may appear nowhere. A commercial premises may have been converted into a residential unit without the required change-of-use file. A rural building may have been regularised only in a limited way. The registry may tell you what has been declared; it does not guarantee that everything you saw at the viewing is lawful.

The practical consequence is valuation. If the mortgage valuation includes square metres that cannot be legalised, the bank may reduce lending. If resale buyers later discover the issue, they may renegotiate or walk. If the town hall has an active disciplinary file, the buyer may inherit a conflict rather than a home.

Why Catastro is not legalisation

Catastro causes the opposite mistake. Because the map is official and often shows the actual physical building, owners assume it has legalised the building. It has not. Catastro is a cadastral and tax record, used for IBI and other fiscal and administrative purposes. It is very useful evidence of surface area, age, use and discrepancies, but it is not a planning licence.

That difference matters most with old extensions and pools. A pool may appear in Catastro because it was detected from aerial imagery or declared for tax regularisation. The owner may have paid higher IBI for years. That does not answer whether the pool had a municipal licence, whether it respects setbacks, whether it sits on protected land, or whether it can be included in a lawful first-occupation or resale file.

Use Catastro as a warning system. If Catastro and the registry disagree, ask why. If both disagree with the actual property, ask twice. If the seller says "it is in Catastro, so it is legal," ask for the building licence or the municipal legalisation document.

Old works and the prescription trap

Spain has limitation periods for many urban-planning restoration powers, but this is where foreign buyers get a dangerously simple story. The story is: "It was built years ago, so it has prescribed." The better version is: "Time may affect what the administration can now order, depending on the region, the land classification, the type of infringement and whether protected interests are involved."

Some irregular works may be compatible with planning and legalisable by filing the correct project, paying fees and taxes, and obtaining the licence that should have been obtained before. Others are incompatible but old enough that the administration may no longer be able to order restoration under the ordinary period. Others are on protected rural land, public domain, coastal protection zones, roads, easements or other categories where ordinary prescription analysis may not rescue the building.

Even where restoration action is time-barred, that is not the same as full legality. The property may remain outside planning, limited in the works it can obtain later, difficult to mortgage, difficult to insure, difficult to rent legally, or less valuable on resale. The question is not just "can they demolish it tomorrow?" It is "what status am I buying for the next ten years?"

AFO in Andalucia

On the Costa del Sol and inland Andalucia, foreign buyers often meet the term AFO: asimilado a fuera de ordenación. The Junta de Andalucia describes AFO as the situation of a finished building constructed without the required planning licences, or contrary to them, where it is no longer possible to adopt measures for protection of urban legality or restoration of the disturbed legal order.

AFO is useful because it gives an irregular building a recognised administrative status and can support access to basic services under the conditions set by the resolution. It is not the same thing as a normal licence of first occupation. The Andalusian rules expressly distinguish AFO from ordinary occupation or use licences. In plain English: AFO may make a building tolerable and usable under conditions; it does not rewrite history as if the building had been licensed from the start.

That distinction should be priced. AFO may be acceptable for a buyer who understands the limitations, especially with an existing rural home that will be used as it stands. It is more problematic for a buyer who wants to extend, mortgage aggressively, create tourist accommodation, split the property, use it as pristine residence evidence, or resell quickly to a cautious buyer.

Why this matters to a residence file

Immigration authorities are not town-planning departments. They do not normally audit your building licence line by line. But if you are using the property to support proof of accommodation, the property must be credible as a place you can actually live.

A clean title deed to a lawful, habitable dwelling is useful. A deed to a property missing the document that confirms residential occupation, or where the utility connection depends on an AFO resolution with conditions, may require more explanation. A rural building in an unresolved planning file is not the same accommodation evidence as a normal apartment with utility bills and a first-occupation trail. If timing matters, a clean long-term lease may be safer while the property issue is being resolved.

The issue also affects budget. Legalisation costs, architect reports, municipal taxes, penalties, retained price, utility works and possible demolition of an illegal element do not help meet the income requirement for the non-lucrative visa. They simply reduce the cash cushion. That is why this page belongs next to buying property and the non-lucrative visa, not only next to real-estate due diligence.

What to ask before signing arras

The moment to protect yourself is before the deposit contract. Once the arras is signed, the dispute becomes more expensive because the seller and buyer have already allocated the cost of walking away.

• Ask for the municipal licence or declaration for any construction, extension, pool, enclosure or change of use. If the answer is "everyone has one," ask for the paper.
• Ask for the first-occupation licence, responsible declaration or equivalent document where the property type and region require it.
• Compare registry, Catastro and the physical property. Any mismatch needs an explanation from a technician, not a sales reassurance.
• Request a town hall planning certificate or file review for rural, old, heavily altered or discounted properties.
• Check community minutes where the work affects common elements. A terrace enclosure, facade change, air-conditioning unit or tourist use may also need community context. Our page on the comunidad de propietarios for foreign owners explains why those minutes matter.
• Make legalisation a condition, retention or price adjustment. Do not leave it as a promise to "sort after completion" unless you have priced the risk and know who pays.
• For vacant or bank-owned properties, also check possession. A planning issue and an occupation issue are different, but they often meet in neglected assets. See our note on squatters and empty homes in Spain.

A buyer does not need to reject every imperfect property. Spanish property has history, and many homes have a paper issue somewhere. The question is whether the issue is known, bounded, documented and reflected in the contract.

Document map

Document or record	What it proves	What it does not prove	Buyer risk if missing
Nota simple / Land Registry	Registered owner, charges, registered description	That every physical element has municipal planning approval	Title may be clean while terrace, pool or guest unit is irregular
Catastro	Tax mapping, surface area and cadastral use for IBI	Urban-planning legality or building licence	Buyer mistakes tax recognition for legalisation
Licencia de obras	Town hall authorisation for the works or project	That the finished work matched it or can be occupied	Work may need legalisation, reduction or demolition
Final works certificate	Technician confirms completion under the project	That the town hall accepted first use in every case	New work declaration or utility sequence may stall
First-occupation licence or equivalent	Residential use/habitability gate for the finished building	That later alterations were also licensed	Utilities, mortgage, resale and visa accommodation evidence can weaken
AFO resolution in Andalucia	Recognised status for certain finished irregular buildings where restoration action is no longer possible	Full normal legality or a standard occupation licence	Future works, valuation, financing and resale may be limited

Sources reviewed August 2026: Real Decreto Legislativo 7/2015, consolidated Land and Urban Rehabilitation Act, especially article 28 on declarations of new construction and completed works, the planning approval or conformity required by territorial and urban-planning law, technical certification and authorisations needed for the intended use; Law 38/1999 on Building Regulation, including the final works certificate and the building agents' responsibilities; Directorate-General for Legal Certainty and Public Faith resolutions applying article 28 and treating the first-occupation licence or equivalent regional declaration as the usual administrative control of suitability for the intended use; Junta de Andalucia guidance on buildings in asimilado a fuera de ordenación status; Andalusian Decree 2/2012 on AFO, including the distinction between AFO and ordinary occupation or use licences; and current Andalusian urban-planning guidance under the LISTA framework. Urban-planning law is regional and municipal, and limitation periods and declaration systems differ by autonomous community. This page is general information, not legal advice on a specific property.