Building permits for renovations in Spain: what owners should know

Almost all building work in Spain requires some form of permission from the town hall (ayuntamiento). The type of permission depends on the scope of the work and on local rules, which differ from one municipality to the next. This guide explains the main concepts so you can ask the right questions. It is general information, not legal advice: the requirements for your property are always set by the municipality.

Minor and major works

Spanish municipalities generally distinguish between minor works (obra menor) and major works (obra mayor). Minor works are typically interior updates that do not affect the structure, such as replacing a kitchen or bathroom, new floors or repainting. Major works include new buildings, extensions, changes to the structure, changes to the façade and work that alters the use of a building.

For many minor works, municipalities use a simplified procedure such as a declaración responsable or comunicación previa, in which the owner declares the work before starting. Major works usually require a licencia de obra mayor, granted after the town hall reviews a technical project.

When a technical project is needed

New buildings, home extensions and structural alterations normally require a project drawn up by a qualified technician, typically an architect, and sometimes calculations by an engineer. The project describes the work, the structure and the safety measures, and it forms the basis of the permit application. Our engineering work bridges this technical planning and the construction itself.

Taxes and fees

When applying for a building permit, the municipality usually charges a construction tax (ICIO) and an administrative fee, calculated on the budget of the work. The amounts vary by municipality, so include them in your budget from the start.

Pools, walls and outdoor work

Swimming pools, boundary walls, pergolas and other outdoor structures also usually need municipal permission. Rules on distances to boundaries and maximum heights are set locally, and communities in urbanisations may have their own guidelines.

Apartments and the community of owners

If you own an apartment or a home in a community, some work needs the approval of the community of owners (comunidad de propietarios), especially work that affects the façade, the structure, terraces or other common elements. Check the community's rules and inform the administrator before planning such work.

Coastal properties

Properties very close to the shoreline may be subject to additional restrictions under Spanish coastal law. If your home is near the sea, ask about this before planning an extension or significant exterior work.

How we approach permissions

At the start of a project we discuss which permissions the work is likely to need and which documents already exist, such as drawings, previous permits or the property's registry details. Where a technical project is required, it is coordinated with the construction scope so the proposal reflects what will be approved. The responsibilities for obtaining each permission are agreed in writing before the work starts.

Questions to ask before you start

• Is the work minor or major under the municipality's rules?
• Is a technical project or engineer's calculation required?
• Does the community of owners need to approve anything?
• Who applies for the permit, and who pays the taxes and fees?
• How long does the municipality usually take to respond?

If you are considering an extension, a new opening or a complete renovation, contact us with the address and your plans and we will discuss the steps with you.