A building shown in Catastro does not necessarily have permission
Catastro records information that helps identify a property, including use, area and recorded buildings. It helps compare a listing with the paperwork. However, an extension appearing on the map does not demonstrate that it is authorised.
If the seller mentions a pool, enclosed terrace or added room, ask for the documents. To find out what can be done on the land, you also need the planning rules setting out permitted uses and building work at that location.
- Compare buildings in the listing with those in the documents.
- Ask which permissions exist for completed work.
- Distinguish what Catastro describes from what the municipality authorises.
Use maps to prepare questions for the municipality
In the Balearic Islands, you can start with the Mapa Urbanístic de les Illes Balears, known as MUIB. It brings together plans and information to help locate land and understand the planning information collected for the area.
Use it for orientation and to prepare an enquiry. The service itself explains that information may need updating and should be checked against approved rules. For an important decision, request the current documents affecting the specific property from the municipality.
- Locate the site and check that it is the correct plot.
- Record the names and dates of the plans consulted.
- Ask about rule changes that may affect the home.
Describe the work you want to carry out, not just the address
‘Can I renovate?’ is too broad a question. Replacing kitchen furniture, altering a wall and extending a home are different jobs. The better you explain the idea, the more useful the response from a technical specialist or municipality can be.
Prepare photos and a simple description of the changes. Indicate where you intend to work and whether it affects the façade, roof, terrace or shared spaces. They can then explain what documents are needed to study the case, without assuming work is possible simply because space exists.
- Describe what you want to change and how you will use the space.
- Indicate whether shared building areas are affected.
- Ask which checks and permissions your proposal needs.
Clarify previous work before relying on it
An old photograph may show that a building existed on a particular date. This helps establish its history, but does not demonstrate permission or a right to extend it. An owner's explanation can likewise guide you while still requiring supporting paperwork.
If documents are missing, record exactly what you need and who can supply it. Before buying on the assumption that a use or renovation is possible, have the available documents reviewed. It is better to understand the uncertainty before arranging work that depends on it.
- Ask for permissions and plans for previous renovations.
- Keep the answers and distinguish documents from verbal explanations.
- Consult a professional if your purchase depends on building work being possible.
Frequently asked questions
Can a report confirm that I can extend the house?
It can help identify matters to check. Confirming an extension requires examination of the specific work, current rules and property documents with the municipality or a professional.
Does an old photograph mean the house is lawful?
It may show that the building existed when the photo was taken. It does not by itself demonstrate permission. Request documents and advice if this affects your purchase.
Where to consult this information
These official pages help you learn more and prepare your questions.