It depends where the property is. Many planning laws in Spain are set at a regional level. That said, the scope of ‘permitted development’ in Spain is quite restricted in all areas. In Catalonia, for example, you wouldn’t need a building licence to do the work you mention, but you would need an ‘assabentat’ which you can get online without any wait, and I think is free. To be on the safe side just check the website of your ayuntamiento. That should have instructions as to permitted development in your municipality.
Everything you need to know about property in Spain
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