Checking the Legality of Buildings and Land on Mallorca

Four areas, four meanings

International buyers should check four levels separately. The registered area results from the land register and the Escritura. It describes ownership, rights, encumbrances, boundaries, and, if applicable, the registered obra nueva. The cadastral area is an administrative and tax description of the property and its buildings. It helps with identification but does not replace a building permit.

The actually built area is what an architect measures on site: residential house, garage, storage room, stable, pool, technical room, porch, terraces, walls, driveways, and other interventions. The approved area results from licenses, approved projects, completion certificates, occupancy or first-use titles, and the current urban planning situation. Only this level answers the legality question.

Why a cadastral entry is not enough

The Spanish cadastre, known as the Catastro, records properties with reference number, location, type of use, graphic representation, building areas, year of construction, and other data. In practice, this cadastral data is helpful to make buildings, land areas, and structural elements visible. However, it does not prove that a building or structural modification was legally approved. A pool, an extension, or an outbuilding may be registered in the cadastre and still never have been legalized.

Also important is the method of area calculation: According to cadastral logic, covered balconies, terraces, porches, and similar elements are often only partially considered, provided they are not largely enclosed. However, for building law assessment, other criteria may be decisive, such as built area, sealing, volume, use, distances, heights, or landscape integration.

Land register: important, but not everything

The nota simple or certificación registral shows owners, encumbrances, rights, descriptions, and, if applicable, registered buildings. If the graphic coordination with the cadastre is registered, it increases certainty regarding the location, boundaries, and area of the property. However, old fincas often have historical descriptions, imprecise boundaries, or area discrepancies.

If the actual land area deviates significantly from the registered area, a correction through registry or notarial procedures may be necessary. This is not just technical cosmetics: For rural properties, areas, boundaries, and parceling often influence whether a use, extension, or new construction is even permissible.

Identifying approved buildings

A legally secure purchase checks the origin of each building component: main residence, extension, guest house, garage, agricultural building, technical room, pool, covered terrace, pergola, enclosed veranda, driveway, and retaining walls. Decisive are building or legalization licenses, approved plans, certificado final de obra, first use or comparable titles, and whether the current use corresponds to the approved use.

Particularly critical are outbuildings that were previously used for agriculture and now appear as a studio, guest room, or holiday area. A room approved as almacén is not automatically living space. Similarly, a terrace is not automatically expandable, and an old shed does not automatically become legal living space through renovation.

Pools, terraces, and extensions

Pools are a classic risk point with fincas. For new pools on suelo rústico, Balearic urban planning law sets tight limits, including generally only one pool per finca and restrictions on water surface area and volume. For existing pools, it must be checked whether they are approved, legalized, time-barred, out of order, or still contestable.

Covered terraces, porches, enclosed terraces, winter gardens, pergolas with fixed elements, outdoor kitchens, and technical rooms often change the built reality. They can affect area and volume parameters, even if they appear in sales documents as "just terrace" or "just storage room."

Rural properties: special risks

On suelo rústico, stricter rules apply than in urban zones. For new residential buildings, minimum areas, one-house-per-parcel principles, landscape protection, water, wastewater, paths, fire protection, flood risks, and sectoral requirements become relevant. On protected rural land, special caution is required because the administration's ability to demand restoration of legality does not expire in all cases.

The Agencia de Defensa del Territorio de Mallorca and the municipalities can carry out inspections, sanctions, and restoration of legality. This can mean demolition orders, use prohibitions, fines, entries in the land register, or restrictions on supply, renovation, financing, and resale.

Out of order and legalization

A building may be registered or old and still be considered fuera de ordenación. In that case, permissible works are often severely limited, e.g., to safety, hygiene, or maintenance. An obra nueva antigua can be registered in the land register under certain conditions if the deadlines for restoration of legality have expired. However, this is not the same as a full urban planning permit.

Since the Balearic simplification legislation, an extraordinary legalization procedure exists for certain existing buildings, facilities, and uses on suelo rústico. For Mallorca, this procedure was activated by the Consell in 2025. It only applies to cases where restoration of legality can no longer be demanded and requires, among other things, a technical legalization application, environmental and efficiency measures, wastewater solution, as well as fees and an economic contribution. Certain cases are excluded, such as public domains, protection strips, road and water law easements, certain flood areas, demolition obligations, illegal settlements, or total inventories not simultaneously regularized.

Checklist before purchase

• Obtain current nota simple or certificación registral and check for ownership, encumbrances, obra nueva, annotations, and graphic coordination.
• Retrieve certificación catastral descriptiva y gráfica and compare with land register, plans, and reality.
• Use MUIB and municipal planning only as a starting point; have current information confirmed by the municipality, Consell, or competent authority.
• Request all licenses, projects, completion certificates, use and legalization titles from the seller.
• Have an architect or technical due diligence expert map each building component individually: legal, demonstrably old, unclear, unapproved, or not legalizable.
• Only sign the purchase contract with clear risk allocation if areas, uses, or legalization are open.

Buyer's rule

A finca is not legal just because it is beautifully renovated, appears in the cadastre, or has stood for decades. What matters is the consistency between ownership, cadastre, actual inventory, and urban planning permit status. Where these levels do not match, the price, financing, contract structure, or even the purchase decision should be adjusted.